Initial commit

.gitignore

@@ -0,0 +1,17 @@
+Thumbs.db
+.DS_Store
+.gradle
+build/
+target/
+out/
+.idea
+*.iml
+*.ipr
+*.iws
+.project
+.settings
+.classpath
+.attach*
+docker-compose.override.yml
+
+cli/src/main/resources/application-override.yml

build.gradle

@@ -0,0 +1,139 @@
+buildscript {
+    ext {
+        micronautVersion = "1.2.0"
+        confluentVersion = "5.2.1"
+        kafkaVersion = "2.3.0"
+        avroVersion = "1.9.0"
+    }
+}
+
+plugins {
+    // micronaut
+    id "io.spring.dependency-management" version "1.0.6.RELEASE"
+    id "java"
+    id "net.ltgt.apt-eclipse" version "0.21"
+    id "net.ltgt.apt-idea" version "0.21"
+    id "com.github.johnrengelman.shadow" version "4.0.2"
+    id "application"
+}
+
+idea {
+    module {
+        downloadJavadoc = true
+        downloadSources = true
+    }
+}
+
+/**********************************************************************************************************************\
+ * Main
+ **********************************************************************************************************************/
+mainClassName = "org.floworc.cli.App"
+sourceCompatibility = 11
+
+dependencies {
+    compile project(":cli")
+}
+
+
+/**********************************************************************************************************************\
+ * All projects
+ **********************************************************************************************************************/
+allprojects {
+    group "org.floworc"
+    version "0.1"
+
+    repositories {
+        mavenCentral()
+        maven { url "https://jcenter.bintray.com" }
+        maven { url "http://packages.confluent.io/maven/" }
+    }
+
+    // micronaut
+    apply plugin:"java"
+    apply plugin:"net.ltgt.apt-eclipse"
+    apply plugin:"net.ltgt.apt-idea"
+    apply plugin: "io.spring.dependency-management"
+
+    dependencyManagement {
+        imports {
+            mavenBom "io.micronaut:micronaut-bom:" + micronautVersion
+        }
+    }
+
+    configurations {
+        // for dependencies that are needed for development only
+        developmentOnly
+    }
+
+    // dependencies
+    dependencies {
+        // utils
+        runtime "ch.qos.logback:logback-classic:1.2.3"
+        compile group: 'com.google.guava', name: 'guava', version: '27.1-jre'
+        compileOnly 'org.projectlombok:lombok:1.18.8'
+        annotationProcessor "org.projectlombok:lombok:1.18.8"
+
+        // micronaut
+        annotationProcessor "io.micronaut:micronaut-inject-java"
+        annotationProcessor "io.micronaut:micronaut-validation"
+        compile "io.micronaut:micronaut-runtime"
+        compile "io.micronaut:micronaut-inject"
+        compile "io.micronaut:micronaut-validation"
+        compile "info.picocli:picocli"
+        compile "io.micronaut.configuration:micronaut-picocli"
+
+        // test
+        testCompile "org.junit.jupiter:junit-jupiter-api"
+        testRuntime "org.junit.jupiter:junit-jupiter-engine"
+        testRuntime "org.junit.jupiter:junit-jupiter-params"
+        testAnnotationProcessor "io.micronaut:micronaut-inject-java"
+        testCompile "io.micronaut.test:micronaut-test-junit5"
+        testCompile "io.micronaut:micronaut-inject-java"
+        testImplementation 'org.hamcrest:hamcrest:2.1'
+        testImplementation 'org.hamcrest:hamcrest-library:2.1'
+
+        // floworc
+        compile group: 'com.devskiller.friendly-id', name: 'friendly-id', version: '1.1.0'
+    }
+}
+
+/**********************************************************************************************************************\
+ * Micronaut
+ **********************************************************************************************************************/
+tasks.withType(JavaCompile){
+    options.encoding = "UTF-8"
+    options.compilerArgs.add("-parameters")
+}
+
+run.classpath += configurations.developmentOnly
+test.classpath += configurations.developmentOnly
+
+run.jvmArgs(
+    "-noverify",
+    "-XX:TieredStopAtLevel=1",
+    "-Dcom.sun.management.jmxremote",
+    '-Dmicronaut.environments=dev,override'
+)
+/**********************************************************************************************************************\
+ * Test
+ **********************************************************************************************************************/
+test {
+    useJUnitPlatform()
+
+    testLogging {
+        exceptionFormat = "full"
+    }
+}
+
+/**********************************************************************************************************************\
+ * Jar
+ **********************************************************************************************************************/
+jar {
+    manifest {
+        attributes "Main-Class": mainClassName
+    }
+}
+
+shadowJar {
+    mergeServiceFiles()
+}

cli/build.gradle

@@ -0,0 +1,11 @@
+sourceCompatibility = 11
+
+dependencies {
+    // micronaut
+    compile "io.micronaut:micronaut-management"
+    compile "io.micronaut:micronaut-http-client"
+    compile "io.micronaut:micronaut-http-server-netty"
+
+    // modules
+    compile project(":core")
+}

cli/src/main/java/org/floworc/core/App.java

@@ -0,0 +1,26 @@
+package org.floworc.core;
+
+import io.micronaut.configuration.picocli.PicocliRunner;
+import picocli.CommandLine;
+
+import java.util.concurrent.Callable;
+
+@CommandLine.Command(
+    name = "floworc",
+    version = "v0.1",
+    header = "floworc client",
+    mixinStandardHelpOptions = true,
+    subcommands = {
+
+    }
+)
+public class App implements Callable<Object> {
+    public static void main(String[] args) throws Exception {
+        PicocliRunner.call(App.class, args);
+    }
+
+    @Override
+    public Object call() throws Exception {
+        return PicocliRunner.call(App.class, "--help");
+    }
+}

cli/src/main/resources/application.yml

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+micronaut:
+  application:
+    name: floworc

cli/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration debug="false">
+    <!-- Remove logback startup log -->
+    <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
+    <property name="pattern" value="%d{ISO8601} %highlight(%-5.5level) %magenta(%-12.12thread) %cyan(%-12.12logger{12}) %msg%n" />
+    <withJansi>true</withJansi>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <target>System.out</target>
+        <immediateFlush>true</immediateFlush>
+        <filter class="ch.qos.logback.classic.filter.LevelFilter">
+            <level>ERROR</level>
+            <onMatch>DENY</onMatch>
+        </filter>
+        <filter class="ch.qos.logback.classic.filter.LevelFilter">
+            <level>WARN</level>
+            <onMatch>DENY</onMatch>
+        </filter>
+        <encoder>
+            <pattern>${pattern}</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="STDERR" class="ch.qos.logback.core.ConsoleAppender">
+        <target>System.err</target>
+        <immediateFlush>true</immediateFlush>
+        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
+            <level>WARN</level>
+        </filter>
+        <encoder>
+            <pattern>${pattern}</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+        <appender-ref ref="STDERR" />
+    </root>
+
+    <logger name="org.apache" level="WARN" />
+    <logger name="io.confluent" level="WARN" />
+
+    <!-- The configuration '%s' was supplied but isn't a known config. > https://github.com/apache/kafka/pull/5876 -->
+    <logger name="org.apache.kafka.clients.producer.ProducerConfig" level="ERROR" />
+    <logger name="org.apache.kafka.clients.admin.AdminClientConfig" level="ERROR" />
+    <logger name="org.apache.kafka.clients.consumer.ConsumerConfig" level="ERROR" />
+</configuration>

core/build.gradle

@@ -0,0 +1,13 @@
+sourceCompatibility = 11
+
+dependencies {
+    // serializers
+    compile group: "org.apache.avro", name: "avro", version: avroVersion
+
+    // yaml
+    compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.9.9.2'
+    compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-yaml', version: '2.9.9'
+
+    // validations
+    compile group: 'org.hibernate.validator', name: 'hibernate-validator', version: '6.0.17.Final'
+}

core/src/main/java/org/floworc/core/executions/Context.java

@@ -0,0 +1,15 @@
+package org.floworc.core.executions;
+
+import lombok.Data;
+import org.floworc.core.flows.State;
+
+import java.util.Map;
+
+@Data
+public class Context {
+    private Map<String, Object> inputs;
+
+    private Map<String, Object> outputs;
+
+    private State state;
+}

core/src/main/java/org/floworc/core/executions/Execution.java

@@ -0,0 +1,72 @@
+package org.floworc.core.executions;
+
+import lombok.*;
+import lombok.experimental.Wither;
+import org.floworc.core.flows.State;
+
+import javax.validation.constraints.NotNull;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+@Value
+@Builder
+public class Execution {
+    @NotNull
+    private String id;
+
+    @NotNull
+    private String flowId;
+
+    @Wither
+    private List<TaskRun> taskRunList;
+
+    @Wither
+    private Context context;
+
+    @NotNull
+    private State state;
+
+    public Execution withState(State.Type state) {
+        return new Execution(
+            this.id,
+            this.flowId,
+            this.taskRunList,
+            this.context,
+            this.state.withState(state)
+        );
+    }
+
+    public TaskRun findTaskRunById(String id) {
+        Optional<TaskRun> find = this.taskRunList
+            .stream()
+            .filter(task -> task.getId().equals(id))
+            .findFirst();
+
+        if (!find.isPresent()) {
+            throw new IllegalArgumentException("Can't find taskrun with id '" + id + "' on execution '" + this.id + "'");
+        }
+
+        return find.get();
+    }
+
+    public Execution withTaskRun(TaskRun taskRun) {
+        ArrayList<TaskRun> newTaskRunList = new ArrayList<>(this.taskRunList);
+
+        //noinspection ResultOfMethodCallIgnored
+        Collections.replaceAll(
+            newTaskRunList,
+            this.findTaskRunById(taskRun.getId()),
+            taskRun
+        );
+
+        return new Execution(
+            this.id,
+            this.flowId,
+            newTaskRunList,
+            this.context,
+            this.state
+        );
+    }
+}

core/src/main/java/org/floworc/core/executions/ExecutionService.java

@@ -0,0 +1,89 @@
+package org.floworc.core.executions;
+
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.flows.State;
+import org.floworc.core.tasks.Task;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+@Slf4j
+public class ExecutionService {
+    public static Optional<List<TaskRun>> getNexts(Execution execution, List<Task> tasks) {
+        if (tasks.size() == 0) {
+            throw new IllegalStateException("Invalid execution " + execution.getId() + " on flow " +
+                execution.getFlowId() + " with 0 task"
+            );
+        }
+
+        // first one
+        if (execution.getTaskRunList() == null) {
+            return Optional.of(tasks.get(0).toTaskRun(execution));
+        }
+
+        // all done
+        long terminatedCount = execution
+            .getTaskRunList()
+            .stream()
+            .filter(taskRun -> taskRun.getState().isTerninated())
+            .count();
+
+        if (terminatedCount == tasks.size()) {
+            return Optional.empty();
+        }
+
+        // find first running
+        Optional<TaskRun> firstRunning = execution
+            .getTaskRunList()
+            .stream()
+            .filter(taskRun -> taskRun.getState().isRunning())
+            .findFirst();
+
+        if (firstRunning.isPresent()) {
+            return tasks
+                .get(execution.getTaskRunList().indexOf(firstRunning.get()))
+                .getChildTaskRun(execution);
+        }
+
+        // reverse
+        ArrayList<TaskRun> reverse = new ArrayList<>(execution.getTaskRunList());
+        Collections.reverse(reverse);
+
+        // find last created
+
+        Optional<TaskRun> lastCreated = reverse
+            .stream()
+            .filter(taskRun -> taskRun.getState().getCurrent() == State.Type.CREATED)
+            .findFirst();
+
+        if (lastCreated.isPresent()) {
+            return Optional.of(new ArrayList<>());
+        }
+
+        // find last termintated
+        Optional<TaskRun> lastTerminated = reverse
+            .stream()
+            .filter(taskRun -> taskRun.getState().isTerninated())
+            .findFirst();
+
+        if (lastTerminated.isPresent()) {
+            if (lastTerminated.get().getState().getCurrent() == State.Type.FAILED) {
+                log.warn("Must find errors path");
+                return Optional.of(new ArrayList<>());
+            } else {
+                int index = execution.getTaskRunList().indexOf(lastTerminated.get());
+
+                if (tasks.size() > index - 1) {
+                    return Optional.of(tasks
+                        .get(index + 1)
+                        .toTaskRun(execution)
+                    );
+                }
+            }
+        }
+
+        return Optional.of(new ArrayList<>());
+    }
+}

core/src/main/java/org/floworc/core/executions/LogEntry.java

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+package org.floworc.core.executions;
+
+import lombok.Data;
+import org.slf4j.event.Level;
+
+import java.time.Instant;
+
+@Data
+public class LogEntry {
+    Instant timestamp;
+
+    Level level;
+
+    String thread;
+
+    String message;
+}

core/src/main/java/org/floworc/core/executions/MetricEntry.java

@@ -0,0 +1,5 @@
+package org.floworc.core.executions;
+
+public class MetricEntry {
+
+}

core/src/main/java/org/floworc/core/executions/TaskRun.java

@@ -0,0 +1,61 @@
+package org.floworc.core.executions;
+
+import com.devskiller.friendly_id.FriendlyId;
+import lombok.Builder;
+import lombok.Value;
+import org.floworc.core.flows.State;
+import org.floworc.core.tasks.Task;
+
+import javax.validation.constraints.NotNull;
+import java.util.ArrayList;
+import java.util.List;
+
+@Value
+@Builder
+public class TaskRun {
+    private String id;
+
+    @NotNull
+    private String executionId;
+
+    @NotNull
+    private String flowId;
+
+    @NotNull
+    private String taskId;
+
+    private Context context;
+
+    @Builder.Default
+    private List<LogEntry> logs = new ArrayList<>();
+
+    @Builder.Default
+    private List<MetricEntry> metrics = new ArrayList<>();
+
+    @NotNull
+    private State state;
+
+    public TaskRun withState(State.Type state) {
+        return new TaskRun(
+            this.id,
+            this.executionId,
+            this.flowId,
+            this.taskId,
+            this.context,
+            this.logs,
+            this.metrics,
+            this.state.withState(state)
+        );
+    }
+
+    public static TaskRun of(Execution execution, Task task) {
+        return TaskRun.builder()
+            .id(FriendlyId.createFriendlyId())
+            .executionId(execution.getId())
+            .flowId(execution.getFlowId())
+            .taskId(task.getId())
+            .state(new State())
+            .build();
+    }
+
+}

core/src/main/java/org/floworc/core/executions/WorkerTask.java

@@ -0,0 +1,28 @@
+package org.floworc.core.executions;
+
+import lombok.Builder;
+import lombok.Value;
+import lombok.experimental.Wither;
+import org.floworc.core.tasks.Task;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.validation.constraints.NotNull;
+
+@Value
+@Builder
+public class WorkerTask {
+    @NotNull
+    @Wither
+    private TaskRun taskRun;
+
+    @NotNull
+    private Task task;
+
+    public Logger logger() {
+        return LoggerFactory.getLogger(
+            "flow." + this.getTaskRun().getFlowId() + "." +
+                this.getTask().getId()
+        );
+    }
+}

core/src/main/java/org/floworc/core/flows/Flow.java

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+package org.floworc.core.flows;
+
+import lombok.*;
+import org.floworc.core.tasks.Task;
+import org.floworc.core.triggers.Trigger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.validation.Valid;
+import javax.validation.constraints.NotNull;
+import java.util.List;
+import java.util.Optional;
+
+@Value
+@Builder
+public class Flow {
+    @NotNull
+    private String id;
+
+    @NotNull
+    private String namespace;
+
+    @Valid
+    private List<Inputs> inputs;
+
+    @Valid
+    private List<Task> tasks;
+
+    @Valid
+    private List<Task> errors;
+
+    @Valid
+    private List<Trigger> triggers;
+
+    public Logger logger() {
+        return LoggerFactory.getLogger("flow." + this.id);
+    }
+
+    public Task findTaskById(String id) {
+        Optional<Task> find = this.tasks
+            .stream()
+            .filter(task -> task.getId().equals(id))
+            .findFirst();
+
+        if (!find.isPresent()) {
+            throw new IllegalArgumentException("Can't find task with id '" + id + "' on flow '" + this.id + "'");
+        }
+
+        return find.get();
+    }
+}

core/src/main/java/org/floworc/core/flows/Inputs.java

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+package org.floworc.core.flows;
+
+
+import lombok.Data;
+
+import javax.validation.constraints.NotNull;
+
+@Data
+public class Inputs {
+    @NotNull
+    private String name;
+
+    private Class type;
+}

core/src/main/java/org/floworc/core/flows/State.java

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+package org.floworc.core.flows;
+
+import lombok.Value;
+import org.floworc.core.executions.TaskRun;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+
+@Value
+public class State {
+    private Type current;
+
+    private List<History> histories;
+
+    public State() {
+        this.current = Type.CREATED;
+        this.histories = new ArrayList<>();
+        this.histories.add(new History(this.current, Instant.now()));
+    }
+
+    public State(Type state, State actual) {
+        this.current = state;
+        this.histories = actual.histories;
+        this.histories.add(new History(this.current, Instant.now()));
+    }
+
+    public State withState(Type state) {
+        return new State(state, this);
+    }
+
+    public Duration duration() {
+        return Duration.between(
+            this.histories.get(0).getDate(),
+            this.histories.size() > 1 ? this.histories.get(this.histories.size() - 1).getDate() : Instant.now()
+        );
+    }
+
+    public String humanDuration() {
+        String duration = duration()
+            .toString()
+            .substring(2)
+            .replaceAll("(\\d[HMS])(?!$)", " $1 ")
+            .toLowerCase();
+
+        return duration.substring(0, duration.length() - 4) + "s";
+    }
+
+    public boolean isTerninated() {
+        return this.current == Type.SKIPPED || this.current == Type.FAILED || this.current == Type.SUCCESS;
+    }
+
+    public boolean isRunning() {
+        return this.current == Type.RUNNING;
+    }
+
+    public enum Type {
+        CREATED,
+        RUNNING,
+        SUCCESS,
+        FAILED,
+        SKIPPED,
+        PAUSED;
+    }
+
+    @Value
+    public static class History {
+        private Type state;
+        private Instant date;
+    }
+}

core/src/main/java/org/floworc/core/queues/QueueInterface.java

@@ -0,0 +1,11 @@
+package org.floworc.core.queues;
+
+import java.util.function.Consumer;
+
+public interface QueueInterface <T> {
+    boolean emit(QueueMessage<T> message);
+
+    void receive(Consumer<QueueMessage<T>> consumer);
+
+    void ack(QueueMessage<T> message);
+}

core/src/main/java/org/floworc/core/queues/QueueMessage.java

@@ -0,0 +1,14 @@
+package org.floworc.core.queues;
+
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class QueueMessage <T> {
+    private String key;
+
+    private T body;
+
+
+}

core/src/main/java/org/floworc/core/queues/QueueName.java

@@ -0,0 +1,11 @@
+package org.floworc.core.queues;
+
+public enum QueueName {
+    WORKERS,
+    EXECUTIONS,
+    WORKERS_RESULT;
+
+    public boolean isPubSub() {
+        return this == EXECUTIONS;
+    }
+}

core/src/main/java/org/floworc/core/queues/types/LocalQueue.java

@@ -0,0 +1,61 @@
+package org.floworc.core.queues.types;
+
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.queues.QueueInterface;
+import org.floworc.core.queues.QueueMessage;
+import org.floworc.core.queues.QueueName;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.function.Consumer;
+
+@Slf4j
+public class LocalQueue <T> implements QueueInterface<T> {
+    private static ThreadPoolExecutor poolExecutor = (ThreadPoolExecutor) Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
+    private QueueName topic;
+    private List<QueueMessage<T>> messages = new ArrayList<>();
+    private List<Consumer<QueueMessage<T>>> consumers = new ArrayList<>();
+
+    public LocalQueue(QueueName topic) {
+        this.topic = topic;
+    }
+
+    @Override
+    public boolean emit(QueueMessage<T> message) {
+        if (log.isTraceEnabled()) {
+            log.trace("New message: topic '{}', key '{}', value {}", this.topic, message.getKey(), message.getBody());
+        }
+
+        this.messages.add(message);
+
+       if (this.consumers != null) {
+            if (this.topic.isPubSub()) {
+                this.consumers
+                    .forEach(consumers ->
+                        poolExecutor.execute(() ->
+                            consumers.accept(message)
+                        )
+                    );
+            } else {
+                poolExecutor.execute(() -> {
+                    this.consumers.get((new Random()).nextInt(this.consumers.size())).accept(message);
+                });
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void receive(Consumer<QueueMessage<T>> consumer) {
+        this.consumers.add(consumer);
+    }
+
+    @Override
+    public void ack(QueueMessage<T> message) {
+        this.messages.remove(message);
+    }
+}

core/src/main/java/org/floworc/core/repositories/ExecutionRepository.java

@@ -0,0 +1,21 @@
+package org.floworc.core.repositories;
+
+import org.floworc.core.executions.Execution;
+
+import java.util.List;
+
+public class ExecutionRepository {
+    private RepositoryStorage repositoryStorage;
+
+    public ExecutionRepository(RepositoryStorage repositoryStorage) {
+        this.repositoryStorage = repositoryStorage;
+    }
+
+    public Execution getById(String id) {
+        return this.repositoryStorage.getByKey(Execution.class, id);
+    }
+
+    public List<Execution> getAll() {
+        return this.repositoryStorage.getAll(Execution.class);
+    }
+}

core/src/main/java/org/floworc/core/repositories/RepositoryInterface.java

@@ -0,0 +1,12 @@
+package org.floworc.core.repositories;
+
+import org.floworc.core.flows.Flow;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface RepositoryInterface {
+    Optional<Flow> getFlowById(String id);
+
+    List<Flow> getFlows();
+}

core/src/main/java/org/floworc/core/repositories/RepositoryStorage.java

@@ -0,0 +1,9 @@
+package org.floworc.core.repositories;
+
+import java.util.List;
+
+public interface RepositoryStorage {
+    <T> T getByKey(Class<T> clz, String id);
+
+    <T> List<T> getAll(Class<T> clz);
+}

core/src/main/java/org/floworc/core/repositories/storages/MemoryStorage.java

@@ -0,0 +1,29 @@
+package org.floworc.core.repositories.storages;
+
+import org.floworc.core.repositories.RepositoryStorage;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class MemoryStorage implements RepositoryStorage {
+    private Map<String, Map<String, Object>> storage = new HashMap<>();
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public <T> T getByKey(Class<T> clz, String id) {
+        return (T) this.storage.get(clz.getName()).get(id);
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+
+    public <T> List<T> getAll(Class<T> clz) {
+        return new ArrayList<>(this.storage.get(clz.getName()).values())
+            .stream()
+            .map(o -> (T) o)
+            .collect(Collectors.toList());
+    }
+}

core/src/main/java/org/floworc/core/repositories/types/LocalRepository.java

@@ -0,0 +1,44 @@
+package org.floworc.core.repositories.types;
+
+import org.floworc.core.flows.Flow;
+import org.floworc.core.repositories.RepositoryInterface;
+import org.floworc.core.serializers.YamlFlowParser;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+public class LocalRepository implements RepositoryInterface {
+    private File basePath;
+    private static final YamlFlowParser yamlFlowParser = new YamlFlowParser();
+
+    public LocalRepository(File basePath) {
+        this.basePath = basePath;
+    }
+
+    @Override
+    public Optional<Flow> getFlowById(String id) {
+        File file = new File(this.basePath, id + ".yaml");
+        try {
+            return Optional.of(yamlFlowParser.parse(file));
+        } catch (IOException e) {
+            return Optional.empty();
+        }
+    }
+
+    @Override
+    public List<Flow> getFlows() {
+        try {
+            return Files.list(this.basePath.toPath())
+                .map(path -> this.getFlowById(path.toFile().getName()))
+                .filter(Optional::isPresent)
+                .map(Optional::get)
+                .collect(Collectors.toList());
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

core/src/main/java/org/floworc/core/runners/ExecutionState.java

@@ -0,0 +1,57 @@
+package org.floworc.core.runners;
+
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.executions.Execution;
+import org.floworc.core.executions.TaskRun;
+import org.floworc.core.executions.WorkerTask;
+import org.floworc.core.queues.QueueInterface;
+import org.floworc.core.queues.QueueMessage;
+
+import java.util.concurrent.ConcurrentHashMap;
+
+@Slf4j
+public class ExecutionState implements Runnable {
+    private QueueInterface<Execution> executionQueue;
+    private QueueInterface<WorkerTask> workerTaskResultQueue;
+    private static ConcurrentHashMap<String, Execution> executions = new ConcurrentHashMap<>();
+
+    public ExecutionState(
+        QueueInterface<Execution> executionQueue,
+        QueueInterface<WorkerTask> workerTaskResultQueue
+    ) {
+        this.executionQueue = executionQueue;
+        this.workerTaskResultQueue = workerTaskResultQueue;
+    }
+
+    @Override
+    public void run() {
+        this.executionQueue.receive(message -> {
+            Execution execution = message.getBody();
+
+            if (execution.getState().isTerninated()) {
+                executions.remove(message.getKey());
+            } else {
+                executions.put(message.getKey(), execution);
+            }
+        });
+
+        this.workerTaskResultQueue.receive(message -> {
+            TaskRun taskRun = message.getBody().getTaskRun();
+
+            if (!executions.containsKey(taskRun.getExecutionId())) {
+                throw new RuntimeException("Unable to find execution '" + taskRun.getExecutionId() + "' on ExecutionState");
+            }
+
+            Execution execution = executions.get(taskRun.getExecutionId());
+
+            Execution newExecution = execution.withTaskRun(taskRun);
+            this.executionQueue.emit(
+                QueueMessage.<Execution>builder()
+                    .key(newExecution.getId())
+                    .body(newExecution)
+                    .build()
+            );
+        });
+    }
+
+}

core/src/main/java/org/floworc/core/runners/Executor.java

@@ -0,0 +1,125 @@
+package org.floworc.core.runners;
+
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.executions.Execution;
+import org.floworc.core.executions.ExecutionService;
+import org.floworc.core.executions.TaskRun;
+import org.floworc.core.executions.WorkerTask;
+import org.floworc.core.flows.Flow;
+import org.floworc.core.flows.State;
+import org.floworc.core.queues.QueueInterface;
+import org.floworc.core.queues.QueueMessage;
+import org.floworc.core.repositories.RepositoryInterface;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Slf4j
+public class Executor implements Runnable {
+    private QueueInterface<Execution> executionQueue;
+    private QueueInterface<WorkerTask> workerTaskQueue;
+    private RepositoryInterface repository;
+
+    public Executor(
+        QueueInterface<Execution> executionQueue,
+        QueueInterface<WorkerTask> workerTaskQueue,
+        RepositoryInterface repositoryInterface
+    ) {
+        this.executionQueue = executionQueue;
+        this.workerTaskQueue = workerTaskQueue;
+        this.repository = repositoryInterface;
+    }
+
+    @Override
+    public void run() {
+        this.executionQueue.receive(message -> {
+            Execution execution = message.getBody();
+
+            if (!execution.getState().isTerninated()) {
+                Flow flow = this.repository
+                    .getFlowById(execution.getFlowId())
+                    .orElseThrow(() -> new IllegalArgumentException("Invalid flow id '" + execution.getFlowId() + "'"));
+
+                ExecutionService.getNexts(execution, flow.getTasks())
+                    .ifPresentOrElse(
+                        nexts -> this.onNexts(flow, execution, nexts),
+                        () -> this.onEnd(flow, execution)
+                    );
+            }
+        });
+    }
+
+    private void onNexts(Flow flow, Execution execution, List<TaskRun> nexts) {
+        if (nexts.size() == 0) {
+            flow.logger().trace(
+                "[execution: {}] Call getNexts but no next found: {}",
+                execution.getId(),
+                execution
+            );
+            return;
+        } else {
+            flow.logger().trace(
+                "[execution: {}] Found nexts {}",
+                execution.getId(),
+                nexts
+            );
+        }
+
+        List<TaskRun> executionTasksRun;
+        Execution newExecution;
+
+        if (execution.getTaskRunList() == null) {
+            executionTasksRun = nexts;
+        } else {
+            executionTasksRun = new ArrayList<>(execution.getTaskRunList());
+            executionTasksRun.addAll(nexts);
+        }
+
+        newExecution = execution.withTaskRunList(executionTasksRun);
+
+        if (execution.getState().getCurrent() == State.Type.CREATED) {
+            flow.logger().info(
+                "[execution: {}] Flow started",
+                execution.getId()
+            );
+
+            newExecution = newExecution.withState(State.Type.RUNNING);
+        }
+
+        this.executionQueue.emit(
+            QueueMessage.<Execution>builder()
+                .key(newExecution.getId())
+                .body(newExecution)
+                .build()
+        );
+
+        final Execution finalNewExecution = newExecution;
+        nexts.forEach(taskRun -> this.workerTaskQueue.emit(QueueMessage.<WorkerTask>builder()
+            .key(finalNewExecution.getId())
+            .body(WorkerTask.builder()
+                .taskRun(taskRun)
+                .task(flow.findTaskById(taskRun.getTaskId()))
+                .build()
+            )
+            .build()
+        ));
+    }
+
+    private void onEnd(Flow flow, Execution execution) {
+        Execution newExecution = execution.withState(State.Type.SUCCESS);
+
+        flow.logger().info(
+            "[execution: {}] Flow completed with state {} in {}",
+            newExecution.getId(),
+            newExecution.getState().getCurrent(),
+            newExecution.getState().humanDuration()
+        );
+
+        this.executionQueue.emit(
+            QueueMessage.<Execution>builder()
+                .key(newExecution.getId())
+                .body(newExecution)
+                .build()
+        );
+    }
+}

core/src/main/java/org/floworc/core/runners/RunnerInterface.java

@@ -0,0 +1,8 @@
+package org.floworc.core.runners;
+
+import org.floworc.core.executions.Execution;
+import org.floworc.core.flows.Flow;
+
+public interface RunnerInterface {
+    void run();
+}

core/src/main/java/org/floworc/core/runners/Worker.java

@@ -0,0 +1,62 @@
+package org.floworc.core.runners;
+
+import org.floworc.core.executions.WorkerTask;
+import org.floworc.core.flows.State;
+import org.floworc.core.queues.QueueInterface;
+import org.floworc.core.queues.QueueMessage;
+
+public class Worker implements Runnable {
+    private QueueInterface<WorkerTask> workerTaskQueue;
+    private QueueInterface<WorkerTask> workerTaskResultQueue;
+
+    public Worker(QueueInterface<WorkerTask> workerTaskQueue, QueueInterface<WorkerTask> workerTaskResultQueue) {
+        this.workerTaskQueue = workerTaskQueue;
+        this.workerTaskResultQueue = workerTaskResultQueue;
+    }
+
+    @Override
+    public void run() {
+        this.workerTaskQueue.receive(message -> {
+            this.run(message.getBody());
+        });
+    }
+
+    public void run(WorkerTask workerTask) {
+        workerTask.logger().info(
+            "[execution: {}] [taskrun: {}] Task started",
+            workerTask.getTaskRun().getExecutionId(),
+            workerTask.getTaskRun().getId()
+        );
+
+        this.workerTaskResultQueue.emit(QueueMessage.<WorkerTask>builder()
+            .key(workerTask.getTaskRun().getExecutionId())
+            .body(workerTask.withTaskRun(workerTask.getTaskRun().withState(State.Type.RUNNING)))
+            .build()
+        );
+
+        try {
+            workerTask.getTask().run();
+
+            this.workerTaskResultQueue.emit(QueueMessage.<WorkerTask>builder()
+                .key(workerTask.getTaskRun().getExecutionId())
+                .body(workerTask.withTaskRun(workerTask.getTaskRun().withState(State.Type.SUCCESS)))
+                .build()
+            );
+        } catch (Exception e) {
+            workerTask.logger().error("Failed task", e);
+
+            this.workerTaskResultQueue.emit(QueueMessage.<WorkerTask>builder()
+                .key(workerTask.getTaskRun().getExecutionId())
+                .body(workerTask.withTaskRun(workerTask.getTaskRun().withState(State.Type.FAILED)))
+                .build()
+            );
+        }
+
+        workerTask.logger().info(
+            "[execution: {}] [taskrun: {}] Task completed in {}",
+            workerTask.getTaskRun().getExecutionId(),
+            workerTask.getTaskRun().getId(),
+            workerTask.getTaskRun().getState().humanDuration()
+        );
+    }
+}

core/src/main/java/org/floworc/core/runners/types/StandAloneRunner.java

@@ -0,0 +1,94 @@
+package org.floworc.core.runners.types;
+
+import com.devskiller.friendly_id.FriendlyId;
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.executions.Execution;
+import org.floworc.core.executions.WorkerTask;
+import org.floworc.core.flows.Flow;
+import org.floworc.core.flows.State;
+import org.floworc.core.queues.QueueMessage;
+import org.floworc.core.queues.QueueName;
+import org.floworc.core.queues.types.LocalQueue;
+import org.floworc.core.repositories.types.LocalRepository;
+import org.floworc.core.runners.ExecutionState;
+import org.floworc.core.runners.Executor;
+import org.floworc.core.runners.RunnerInterface;
+import org.floworc.core.runners.Worker;
+
+import java.io.File;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+@Slf4j
+public class StandAloneRunner implements RunnerInterface {
+    private LocalQueue<Execution> executionQueue;
+    private LocalQueue<WorkerTask> workerTaskQueue;
+    private LocalQueue<WorkerTask> workerTaskResultQueue;
+    private LocalRepository localRepository;
+    private ThreadPoolExecutor poolExecutor;
+
+    public StandAloneRunner(File basePath) {
+        this.executionQueue = new LocalQueue<>(QueueName.EXECUTIONS);
+        this.workerTaskQueue = new LocalQueue<>(QueueName.WORKERS);
+        this.workerTaskResultQueue = new LocalQueue<>(QueueName.WORKERS_RESULT);
+        this.localRepository = new LocalRepository(basePath);
+    }
+
+    @Override
+    public void run() {
+        poolExecutor = (ThreadPoolExecutor) Executors.newFixedThreadPool(5);
+        poolExecutor.execute(new Executor(
+            this.executionQueue,
+            this.workerTaskQueue,
+            this.localRepository
+        ));
+
+        poolExecutor.execute(new ExecutionState(
+            this.executionQueue,
+            this.workerTaskResultQueue
+        ));
+
+        while(poolExecutor.getActiveCount() != poolExecutor.getCorePoolSize()) {
+            poolExecutor.execute(new Worker(
+                this.workerTaskQueue,
+                this.workerTaskResultQueue
+            ));
+        }
+    }
+
+
+    public Execution run(Flow flow) throws InterruptedException {
+        this.run();
+
+        Execution execution = Execution.builder()
+            .id(FriendlyId.createFriendlyId())
+            .flowId(flow.getId())
+            .state(new State())
+            .build();
+
+        AtomicReference<Execution> receive = new AtomicReference<>();
+
+        this.executionQueue.receive(message -> {
+            if (message.getBody().getState().isTerninated()) {
+                receive.set(message.getBody());
+
+                this.poolExecutor.shutdownNow();
+            }
+        });
+
+        this.executionQueue.emit(
+            QueueMessage.<Execution>builder()
+                .key(execution.getId())
+                .body(execution)
+                .build()
+        );
+
+
+        this.poolExecutor.awaitTermination(5, TimeUnit.MINUTES);
+
+        return receive.get();
+    }
+
+}

core/src/main/java/org/floworc/core/serializers/InvalidDefinitionException.java

@@ -0,0 +1,28 @@
+package org.floworc.core.serializers;
+
+import lombok.Getter;
+import org.floworc.core.flows.Flow;
+
+import javax.validation.ConstraintViolation;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@Getter
+public class InvalidDefinitionException extends IllegalArgumentException {
+    private Set<ConstraintViolation<Flow>> violations;
+
+    private InvalidDefinitionException(String message, Set<ConstraintViolation<Flow>> violations) {
+        super(message);
+        this.violations = violations;
+    }
+
+    public static InvalidDefinitionException of(Set<ConstraintViolation<Flow>> violations) {
+        List<String> errors = violations.stream().map(Object::toString).collect(Collectors.toList());
+
+        return new InvalidDefinitionException(
+            "Invalid Flow definitions with errors: \n- " + String.join("\n- ", errors),
+            violations
+        );
+    }
+}

core/src/main/java/org/floworc/core/serializers/YamlFlowParser.java

@@ -0,0 +1,40 @@
+package org.floworc.core.serializers;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.hibernate.validator.messageinterpolation.ParameterMessageInterpolator;
+import org.floworc.core.flows.Flow;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import java.io.File;
+import java.io.IOException;
+import java.util.Set;
+
+public class YamlFlowParser {
+    private static final ObjectMapper mapper = new ObjectMapper(new YAMLFactory())
+        .registerModule(new Jdk8Module())
+        .registerModule(new JavaTimeModule());
+
+    private static final Validator validator = Validation.byDefaultProvider()
+        .configure()
+        .messageInterpolator(new ParameterMessageInterpolator())
+        .buildValidatorFactory()
+        .getValidator();
+
+    public Flow parse(File file) throws IOException {
+        Flow flow = mapper.readValue(file, Flow.class);
+
+        Set<ConstraintViolation<Flow>> violations = validator.validate(flow);
+
+        if (violations.size() > 0) {
+            throw InvalidDefinitionException.of(violations);
+        }
+
+        return flow;
+    }
+}
+

core/src/main/java/org/floworc/core/tasks/Retry.java

@@ -0,0 +1,14 @@
+package org.floworc.core.tasks;
+
+import lombok.*;
+
+import java.time.Duration;
+
+@Data
+public class Retry {
+    private int limit;
+
+    private RetryIntervalType type;
+
+    private Duration interval;
+}

core/src/main/java/org/floworc/core/tasks/RetryIntervalType.java

@@ -0,0 +1,6 @@
+package org.floworc.core.tasks;
+
+public enum RetryIntervalType {
+    CONSTANT,
+    EXPONENTIAL
+}

core/src/main/java/org/floworc/core/tasks/Task.java

@@ -0,0 +1,47 @@
+package org.floworc.core.tasks;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import lombok.Data;
+import org.apache.avro.reflect.Nullable;
+import org.floworc.core.executions.Execution;
+import org.floworc.core.executions.TaskRun;
+
+import javax.validation.constraints.NotNull;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "type", visible = true)
+@Data
+abstract public class Task {
+    @NotNull
+    private String id;
+
+    private String type;
+
+    @Nullable
+    private Retry retry;
+
+    private int timeout;
+
+    private List<Task> errors;
+
+    abstract public Void run() throws Exception;
+
+    public List<TaskRun> toTaskRun(Execution execution) {
+        return Collections.singletonList(TaskRun.of(execution, this));
+    }
+
+    public Optional<List<TaskRun>> getChildTaskRun(Execution execution) {
+        return Optional.of(new ArrayList<>());
+    }
+
+    public Optional<Task> findById(String id) {
+        if (this.getId().equals(id)) {
+            return Optional.of(this);
+        }
+
+        return Optional.empty();
+    }
+}

core/src/main/java/org/floworc/core/tasks/TaskResult.java

@@ -0,0 +1,16 @@
+package org.floworc.core.tasks;
+
+import lombok.Data;
+import org.floworc.core.flows.State;
+
+import java.time.Duration;
+import java.time.Instant;
+
+@Data
+public class TaskResult {
+    private State state;
+
+    private Instant start;
+
+    private Duration duration;
+}

core/src/main/java/org/floworc/core/tasks/debugs/Echo.java

@@ -0,0 +1,21 @@
+package org.floworc.core.tasks.debugs;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.tasks.Task;
+
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Data
+@Slf4j
+public class Echo extends Task {
+    private String format;
+
+    @Override
+    public Void run() throws Exception {
+        log.info(this.format);
+        return null;
+    }
+}

core/src/main/java/org/floworc/core/tasks/flows/Each.java

@@ -0,0 +1,16 @@
+package org.floworc.core.tasks.flows;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.List;
+
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Data
+@Slf4j
+public class Each extends Parallel {
+    private List<String> values;
+}

core/src/main/java/org/floworc/core/tasks/flows/Parallel.java

@@ -0,0 +1,50 @@
+package org.floworc.core.tasks.flows;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.executions.Execution;
+import org.floworc.core.executions.ExecutionService;
+import org.floworc.core.executions.TaskRun;
+import org.floworc.core.tasks.Task;
+
+import java.util.List;
+import java.util.Optional;
+
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Data
+@Slf4j
+public class Parallel extends Task {
+    private Integer concurrent;
+
+    private List<Task> tasks;
+
+    @Override
+    public Optional<Task> findById(String id) {
+        Optional<Task> superFind = super.findById(id);
+        if (superFind.isPresent()) {
+            return superFind;
+        }
+
+        return this.tasks
+            .stream()
+            .map(task -> task.findById(id))
+            .filter(Optional::isPresent)
+            .map(Optional::get)
+            .findFirst();
+    }
+
+    @Override
+    public Optional<List<TaskRun>> getChildTaskRun(Execution execution) {
+        return ExecutionService.getNexts(execution, this.tasks);
+    }
+
+    @Override
+    public Void run() {
+        log.info("Starting '{}'", this.tasks);
+
+        return null;
+    }
+}

core/src/main/java/org/floworc/core/tasks/flows/Switch.java

@@ -0,0 +1,27 @@
+package org.floworc.core.tasks.flows;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.tasks.Task;
+
+import java.util.List;
+import java.util.Map;
+
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Data
+@Slf4j
+public class Switch extends Task {
+    private Map<String, List<Task>> cases;
+
+    private List<Task> defaults;
+
+    @Override
+    public Void run() {
+        log.info("Starting '{}'", this);
+
+        return null;
+    }
+}

core/src/main/java/org/floworc/core/tasks/scripts/Bash.java

@@ -0,0 +1,72 @@
+package org.floworc.core.tasks.scripts;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import lombok.Value;
+import lombok.extern.slf4j.Slf4j;
+import org.floworc.core.tasks.Task;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.List;
+
+
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Value
+@Slf4j
+public class Bash extends Task {
+    private String[] commands;
+
+    @Override
+    public Void run() throws Exception {
+        List<String> commands = Arrays.asList("/bin/sh", "-c", String.join("\n", this.commands));
+
+        log.debug("Starting command [{}]", String.join("; ", this.commands));
+
+        ProcessBuilder processBuilder = new ProcessBuilder();
+        processBuilder.command(commands);
+
+        Process process = processBuilder.start();
+        readInput(process.getInputStream(), false);
+        readInput(process.getErrorStream(), true);
+
+        // process.pid();
+
+        int exitCode = process.waitFor();
+
+        if (exitCode != 0) {
+            throw new RuntimeException("Command failed with code " + exitCode);
+        } else {
+            log.debug("Command succeed with code " + exitCode);
+        }
+
+        return null;
+    }
+
+    private void readInput(InputStream inputStream, boolean isStdErr) {
+        Thread thread = new Thread(() -> {
+            try {
+                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
+                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
+                String line;
+                while ((line = bufferedReader.readLine()) != null) {
+                    if (isStdErr) {
+                        log.warn(line);
+                    } else {
+                        log.info(line);
+                    }
+                }
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        });
+
+        thread.setName("bash-log");
+        thread.start();
+    }
+}

core/src/main/java/org/floworc/core/triggers/Trigger.java

@@ -0,0 +1,8 @@
+package org.floworc.core.triggers;
+
+import lombok.Data;
+
+@Data
+abstract public class Trigger {
+    private String type;
+}

core/src/main/java/org/floworc/core/triggers/types/Schedule.java

@@ -0,0 +1,13 @@
+package org.floworc.core.triggers.types;
+
+import lombok.*;
+import org.floworc.core.triggers.Trigger;
+
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+@Data
+public class Schedule extends Trigger {
+    private String expression;
+
+    private ScheduleBackfill backfill;
+}

core/src/main/java/org/floworc/core/triggers/types/ScheduleBackfill.java

@@ -0,0 +1,10 @@
+package org.floworc.core.triggers.types;
+
+import lombok.*;
+
+import java.time.Instant;
+
+@Data
+public class ScheduleBackfill {
+    private Instant start;
+}

core/src/test/java/org/floworc/core/Utils.java

@@ -0,0 +1,23 @@
+package org.floworc.core;
+
+import org.floworc.core.flows.Flow;
+import org.floworc.core.serializers.YamlFlowParser;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+abstract public class Utils {
+    private static final YamlFlowParser yamlFlowParser = new YamlFlowParser();
+
+    public static Flow parse(String path) throws IOException {
+        URL resource = Utils.class.getClassLoader().getResource(path);
+        assertNotNull(resource);
+
+        File file = new File(resource.getFile());
+
+        return yamlFlowParser.parse(file);
+    }
+}

core/src/test/java/org/floworc/core/runners/StandAloneRunnerTest.java

@@ -0,0 +1,34 @@
+package org.floworc.core.runners;
+
+import org.junit.jupiter.api.Test;
+import org.floworc.core.Utils;
+import org.floworc.core.executions.Execution;
+import org.floworc.core.flows.Flow;
+import org.floworc.core.runners.types.StandAloneRunner;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.util.Objects;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.hasSize;
+
+class StandAloneRunnerTest {
+    private final StandAloneRunner runner = new StandAloneRunner(
+        new File(Objects.requireNonNull(Utils.class.getClassLoader().getResource("flows")).toURI())
+    );
+
+    StandAloneRunnerTest() throws URISyntaxException {
+
+    }
+
+    @Test
+    void run() throws IOException, InterruptedException {
+        Flow flow = Utils.parse("flows/full.yaml");
+        Execution execution = runner.run(flow);
+
+        assertThat(execution.getTaskRunList(), hasSize(4));
+    }
+
+}

core/src/test/java/org/floworc/core/serializers/YamlFlowParserTest.java

@@ -0,0 +1,43 @@
+package org.floworc.core.serializers;
+
+import org.junit.jupiter.api.Test;
+import org.floworc.core.Utils;
+import org.floworc.core.flows.Flow;
+import org.floworc.core.tasks.RetryIntervalType;
+import org.floworc.core.tasks.Task;
+
+import java.io.IOException;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class YamlFlowParserTest {
+    @Test
+    void parse() throws IOException {
+        Flow flow = Utils.parse("flows/full.yaml");
+
+        assertThat(flow.getId(), is("full"));
+        assertThat(flow.getTasks().size(), is(4));
+
+        // third with all optionnals
+        Task optionnals = flow.getTasks().get(2);
+        assertThat(optionnals.getTimeout(), is(1000));
+        assertThat(optionnals.getRetry().getInterval().getSeconds(), is(900L));
+        assertThat(optionnals.getRetry().getType(), is(RetryIntervalType.CONSTANT));
+        assertThat(optionnals.getRetry().getLimit(), is(5));
+    }
+
+    @Test
+    void validation() throws IOException {
+        assertThrows(InvalidDefinitionException.class, () -> {
+            Utils.parse("flows/invalid.yaml");
+        });
+
+        try {
+            Utils.parse("flows/invalid.yaml");
+        } catch (InvalidDefinitionException e) {
+            assertThat(e.getViolations().size(), is(3));
+        }
+    }
+}

core/src/test/java/org/floworc/core/tasks/BashTest.java

@@ -0,0 +1,16 @@
+package org.floworc.core.tasks;
+
+import org.junit.jupiter.api.Test;
+import org.floworc.core.runners.types.StandAloneRunner;
+import org.floworc.core.tasks.scripts.Bash;
+
+class BashTest {
+
+    @Test
+    void run() throws Exception {
+        Bash bash = new Bash(
+            new String[]{"sleep 1", "curl www.google.fr > /dev/null", "echo 0", "sleep 1", "echo 1"}
+        );
+        bash.run();
+    }
+}

core/src/test/resources/flows/full.yaml

@@ -0,0 +1,107 @@
+id: full
+namespace: com.leroymerlin.data.supply
+
+#triggers:
+#- type: schedule
+#  expression: 42 4 1 * *
+#  backfill:
+#    start: 2018-01-01
+#
+
+tasks:
+- id: 1st
+  type: org.floworc.core.tasks.scripts.Bash
+  commands:
+  - 'echo "first"'
+
+- id: 2nd
+  type: org.floworc.core.tasks.debugs.Echo
+  format: second {{todo}}
+
+- id: 3rd
+  type: org.floworc.core.tasks.debugs.Echo
+  format: third all optionnal args {{todo}}
+  timeout: 1000
+  retry:
+    limit: 5
+    type: CONSTANT
+    interval: PT15M
+
+- id: 4th
+  type: org.floworc.core.tasks.flows.Parallel
+  concurrent: 3
+  tasks:
+  - id: 4th - 1st
+    type: org.floworc.core.tasks.scripts.Bash
+    commands:
+    - echo "{{id}}"
+  - id: 4th - 2nd
+    type: org.floworc.core.tasks.scripts.Bash
+    commands:
+    - echo "{{id}}"
+  - id: 4th - 3rd
+    type: org.floworc.core.tasks.scripts.Bash
+    commands:
+    - echo "{{id}}"
+  - id: 4th - 4th
+    type: org.floworc.core.tasks.scripts.Bash
+    commands:
+    - echo "{{id}}"
+  - id: 4th - 5th
+    type: org.floworc.core.tasks.scripts.Bash
+    commands:
+    - echo "{{id}}"
+
+#- type: python
+#  commands:
+#  - print(bla)
+#- type: each
+#  values: {{selector}}
+#  tasks:
+#  - type: org.floworc.core.tasks.scripts.Bash
+#    commands:
+#    - echo {{item}}
+#
+#- type: switch
+#  expression: {{selector}}
+#  cases:
+#     - value: hello
+#       tasks:
+#         - type: org.floworc.core.tasks.debugs.Echo
+#           text: hello world
+#     - value: bye
+#       tasks:
+#         - type: org.floworc.core.tasks.debugs.Echo
+#           text: goodbye world
+#  default:
+#    - tasks:
+#        -type: org.floworc.core.tasks.debugs.Echo
+#         text: something else
+#
+#- type: branch
+#  branches:
+#    first:
+#    - type: org.floworc.core.tasks.scripts.Bash
+#      commands:
+#      - echo "first branch - step 1"
+#    - type: org.floworc.core.tasks.scripts.Bash
+#      commands:
+#      - echo "first branch - step 2"
+#    second:
+#    - type: org.floworc.core.tasks.scripts.Bash
+#      commands:
+#      - echo "second branch - step 1"
+#    - type: org.floworc.core.tasks.scripts.Bash
+#      commands:
+#      - echo "second branch - step 2"
+#
+#- type: org.floworc.core.tasks.scripts.Bash
+#  commands: sleep 5
+#  timeout: 1
+#  errors:
+#    - type: org.floworc.core.tasks.scripts.Bash
+#      commands:
+#      - echo "first branch - step 1"
+#    - type: org.floworc.core.tasks.scripts.Bash
+#      commands:
+#      - echo "first branch - step 2"

core/src/test/resources/flows/invalid.yaml

@@ -0,0 +1,4 @@
+tasks:
+- type: org.floworc.core.tasks.scripts.Bash
+  commands:
+  - echo "bla"

core/src/test/resources/logback.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration debug="false">
+    <!-- Remove logback startup log -->
+    <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
+    <property name="pattern" value="%d{ISO8601} %highlight(%-5.5level) %magenta(%-12.12thread) %cyan(%-12.12logger{12}) %msg%n" />
+    <withJansi>true</withJansi>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <target>System.out</target>
+        <immediateFlush>true</immediateFlush>
+        <encoder>
+            <pattern>${pattern}</pattern>
+        </encoder>
+    </appender>
+
+
+    <root level="WARN">
+        <appender-ref ref="STDOUT" />
+    </root>
+
+    <logger name="org.floworc" level="DEBUG" />
+    <logger name="flow" level="DEBUG" />
+</configuration>

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Thu Apr 25 10:26:30 CEST 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip

gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

lombok.config

@@ -0,0 +1,2 @@
+lombok.addLombokGeneratedAnnotation = true
+lombok.anyConstructor.addConstructorProperties = true

settings.gradle

@@ -0,0 +1,4 @@
+rootProject.name="floworc"
+
+include 'cli'
+include 'core'