examples/java/common.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.
 */

 /*
 * A convenient task to run individual example directly on Beam repo.
 *
 * Usage:
 * ./gradlew :examples:java:execute -PmainClass=org.apache.beam.examples.<ClassName>`\
 *  -Pexec.args="runner=[DataflowRunner|DirectRunner|FlinkRunner|SparkRunner|PrismRunner] \
 * <pipeline options>"
 */
tasks.create(name:"execute", type:JavaExec) {
  mainClass = project.hasProperty("mainClass") ? project.getProperty("mainClass") : "NONE"
  def execArgs =  project.findProperty("exec.args")
  String runner
  if (execArgs) {
    // configure runner dependency from args
    def runnerPattern = /runner[ =]([A-Za-z]+)/
    def matcher = execArgs =~ runnerPattern
    if (matcher) {
      runner = matcher[0][1]
      runner = runner.substring(0, 1).toLowerCase() + runner.substring(1);
      if (!(runner in (preCommitRunners + nonPreCommitRunners))) {
        throw new GradleException("Unsupported runner: " + runner)
      }
    }
  }
  if (runner) {
    classpath = sourceSets.main.runtimeClasspath + configurations."${runner}PreCommit"
  } else {
    classpath = sourceSets.main.runtimeClasspath
  }
  systemProperties System.getProperties()
  args execArgs ? execArgs.split() : []
}