/*
* Copyright 2012 the original author or authors.
*
* Licensed 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.
*/
package org.gradle.execution.taskgraph;
import org.gradle.api.Project;
import org.gradle.api.Task;
import org.gradle.api.execution.TaskExecutionListener;
import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;
import org.gradle.internal.concurrent.ExecutorFactory;
import org.gradle.internal.concurrent.StoppableExecutor;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Executor;
class ParallelTaskPlanExecutor extends AbstractTaskPlanExecutor {
private static final Logger LOGGER = Logging.getLogger(ParallelTaskPlanExecutor.class);
private final int executorCount;
private final ExecutorFactory executorFactory;
public ParallelTaskPlanExecutor(int numberOfParallelExecutors, ExecutorFactory executorFactory) {
this.executorFactory = executorFactory;
if (numberOfParallelExecutors < 1) {
throw new IllegalArgumentException("Not a valid number of parallel executors: " + numberOfParallelExecutors);
}
this.executorCount = numberOfParallelExecutors;
}
public void process(final TaskExecutionPlan taskExecutionPlan, final TaskExecutionListener taskListener) {
StoppableExecutor executor = executorFactory.create("Task worker");
try {
startAdditionalWorkers(taskExecutionPlan, taskListener, executor);
taskWorker(taskExecutionPlan, taskListener).run();
taskExecutionPlan.awaitCompletion();
} finally {
executor.stop();
}
}
private void startAdditionalWorkers(TaskExecutionPlan taskExecutionPlan, TaskExecutionListener taskListener, Executor executor) {
List<Project> projects = getAllProjects(taskExecutionPlan);
int numExecutors = Math.min(executorCount, projects.size());
LOGGER.info("Using {} parallel executor threads", numExecutors);
for (int i = 1; i < numExecutors; i++) {
Runnable worker = taskWorker(taskExecutionPlan, taskListener);
executor.execute(worker);
}
}
private List<Project> getAllProjects(TaskExecutionPlan taskExecutionPlan) {
final Set<Project> uniqueProjects = new LinkedHashSet<Project>();
for (Task task : taskExecutionPlan.getTasks()) {
uniqueProjects.add(task.getProject());
}
return new ArrayList<Project>(uniqueProjects);
}
}