build.gradle

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

plugins {
    id 'com.github.johnrengelman.shadow' version '7.0.0' apply false
    id "com.diffplug.spotless" version "5.14.0" apply false
}

description = "Flink Training Exercises"

allprojects {
    group = 'org.apache.flink'
    version = '1.13-SNAPSHOT'

    apply plugin: 'com.diffplug.spotless'

    spotless {
        format 'misc', {
            // define the files to apply `misc` to
            target '*.gradle', '*.md', '.gitignore'

            // define the steps to apply to those files
            trimTrailingWhitespace()
            indentWithSpaces(4)
            endWithNewline()
        }
    }
}

subprojects {
    apply plugin: 'java'
    // apply plugin: 'scala' // optional; uncomment if needed
    apply plugin: 'com.github.johnrengelman.shadow'
    apply plugin: 'checkstyle'
    apply plugin: 'eclipse'

    ext {
        javaVersion = '1.8'
        flinkVersion = '1.13.1'
        scalaBinaryVersion = '2.12'
        log4jVersion = '2.12.1'
        junitVersion = '4.12'
    }

    sourceCompatibility = javaVersion
    targetCompatibility = javaVersion
    tasks.withType(JavaCompile) {
        options.encoding = 'UTF-8'
    }

    // declare where to find the dependencies of your project
    repositories {
        // for access from China, you may need to uncomment this line
        // maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        mavenCentral()
        maven {
            url "https://repository.apache.org/content/repositories/snapshots/"
            mavenContent {
                snapshotsOnly()
            }
        }
    }

    // common set of dependencies
    dependencies {
        shadow "org.apache.logging.log4j:log4j-slf4j-impl:${log4jVersion}"
        shadow "org.apache.logging.log4j:log4j-api:${log4jVersion}"
        shadow "org.apache.logging.log4j:log4j-core:${log4jVersion}"

        shadow "org.apache.flink:flink-clients_${scalaBinaryVersion}:${flinkVersion}"
        shadow "org.apache.flink:flink-java:${flinkVersion}"
        shadow "org.apache.flink:flink-streaming-java_${scalaBinaryVersion}:${flinkVersion}"
        shadow "org.apache.flink:flink-streaming-scala_${scalaBinaryVersion}:${flinkVersion}"

        if (project != project(":common")) {
            implementation project(path: ':common')
            testImplementation(project(":common")) {
                capabilities { requireCapability("$group:common-test") }
            }
        }
    }

    // add solution source dirs:
    sourceSets {
        main.java.srcDirs += 'src/solution/java'
        tasks.withType(ScalaCompile) {
            main.scala.srcDirs += 'src/solution/scala'
        }

        // Add shadow configuration to runtime class path so that the
        // dynamically-generated tasks by IntelliJ are able to run and have
        // all dependencies they need. (Luckily, this does not influence what
        // ends up in the final shadowJar.)
        main.runtimeClasspath += configurations.shadow

        test.compileClasspath += configurations.shadow
        test.runtimeClasspath += configurations.shadow
    }

    project.plugins.withId('application') {
        ['javaExerciseClassName', 'javaSolutionClassName'].each { property ->
            createTrainingRunTask(project, property)
        }
    }
    pluginManager.withPlugin('scala') {
        project.plugins.withId('application') {
            ['scalaExerciseClassName', 'scalaSolutionClassName'].each { property ->
                createTrainingRunTask(project, property)
            }
        }
    }

    spotless {
        java {
            googleJavaFormat('1.7').aosp()

            // \# refers to static imports
            importOrder('org.apache.flink', 'org.apache.flink.shaded', '', 'javax', 'java', 'scala', '\\#')
            removeUnusedImports()

            targetExclude("**/generated*/*.java")
        }
    }

    jar {
        manifest {
            attributes 'Built-By': System.getProperty('user.name'),
                    'Build-Jdk': System.getProperty('java.version')
        }
    }

    shadowJar {
        mergeServiceFiles()
        dependencies {
            exclude(dependency("org.apache.flink:force-shading"))
            exclude(dependency('com.google.code.findbugs:jsr305'))
            exclude(dependency('org.slf4j:.*'))
            exclude(dependency('log4j:.*'))
            exclude(dependency('org.apache.logging.log4j:log4j-to-slf4j'))
            // already provided dependencies from serializer frameworks
            exclude(dependency('com.esotericsoftware.kryo:kryo'))
            exclude(dependency('javax.servlet:servlet-api')) // TODO: check if needed
            exclude(dependency('org.apache.httpcomponents:httpclient')) // TODO: check if needed
        }
    }

    assemble.dependsOn(shadowJar)
}

tasks.register('printRunTasks') {
    println '------------------------------------------------------------'
    println 'Flink Training Tasks runnable from root project \'' + project.name + '\''
    println '------------------------------------------------------------'

    subprojects.findAll { project ->
        boolean first = true;
        project.tasks.withType(JavaExec) { task ->
            if (task.group == 'flink-training') {
                if (first) {
                    println ''
                    println '> Subproject \'' + project.name + '\''
                    first = false;
                }
                println './gradlew :' + project.name + ':' + task.name
            }
        }
    }
}

static def void createTrainingRunTask(Project project, String property) {
    if (project.ext.has(property)) {
        project.tasks.create(name: classNamePropertyToTaskName(property), type: JavaExec) {
            classpath = project.sourceSets.main.runtimeClasspath
            mainClass = project.ext.get(property)
            group = 'flink-training'
        }
    }
}

static def String classNamePropertyToTaskName(String property) {
    return 'run' +
            property.charAt(0).toString().toUpperCase() +
            property.substring(1, property.lastIndexOf('ClassName'))

}