/*
* 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.Action;
import org.gradle.api.internal.TaskInternal;
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 org.gradle.internal.time.Timer;
import org.gradle.internal.time.Timers;
import org.gradle.internal.work.WorkerLeaseRegistry.WorkerLease;
import org.gradle.internal.work.WorkerLeaseService;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicLong;
import static org.gradle.internal.time.Clock.prettyTime;
class DefaultTaskPlanExecutor implements TaskPlanExecutor {
private static final Logger LOGGER = Logging.getLogger(DefaultTaskPlanExecutor.class);
private final int executorCount;
private final ExecutorFactory executorFactory;
private final WorkerLeaseService workerLeaseService;
public DefaultTaskPlanExecutor(int numberOfParallelExecutors, ExecutorFactory executorFactory, WorkerLeaseService workerLeaseService) {
this.executorFactory = executorFactory;
if (numberOfParallelExecutors < 1) {
throw new IllegalArgumentException("Not a valid number of parallel executors: " + numberOfParallelExecutors);
}
this.executorCount = numberOfParallelExecutors;
this.workerLeaseService = workerLeaseService;
}
@Override
public void process(TaskExecutionPlan taskExecutionPlan, Action<? super TaskInternal> taskWorker) {
StoppableExecutor executor = executorFactory.create("Task worker");
try {
WorkerLease parentWorkerLease = workerLeaseService.getCurrentWorkerLease();
startAdditionalWorkers(taskExecutionPlan, taskWorker, executor, parentWorkerLease);
taskWorker(taskExecutionPlan, taskWorker, parentWorkerLease).run();
taskExecutionPlan.awaitCompletion();
} finally {
executor.stop();
}
}
private void startAdditionalWorkers(TaskExecutionPlan taskExecutionPlan, Action<? super TaskInternal> taskWorker, Executor executor, WorkerLease parentWorkerLease) {
LOGGER.debug("Using {} parallel executor threads", executorCount);
for (int i = 1; i < executorCount; i++) {
Runnable worker = taskWorker(taskExecutionPlan, taskWorker, parentWorkerLease);
executor.execute(worker);
}
}
private Runnable taskWorker(TaskExecutionPlan taskExecutionPlan, Action<? super TaskInternal> taskWorker, WorkerLease parentWorkerLease) {
return new TaskExecutorWorker(taskExecutionPlan, taskWorker, parentWorkerLease);
}
private static class TaskExecutorWorker implements Runnable {
private final TaskExecutionPlan taskExecutionPlan;
private final Action<? super TaskInternal> taskWorker;
private final WorkerLease parentWorkerLease;
private TaskExecutorWorker(TaskExecutionPlan taskExecutionPlan, Action<? super TaskInternal> taskWorker, WorkerLease parentWorkerLease) {
this.taskExecutionPlan = taskExecutionPlan;
this.taskWorker = taskWorker;
this.parentWorkerLease = parentWorkerLease;
}
public void run() {
final AtomicLong busy = new AtomicLong(0);
Timer totalTimer = Timers.startTimer();
final Timer taskTimer = Timers.startTimer();
WorkerLease childLease = parentWorkerLease.createChild();
boolean moreTasksToExecute = true;
while (moreTasksToExecute) {
moreTasksToExecute = taskExecutionPlan.executeWithTask(childLease, new Action<TaskInfo>() {
@Override
public void execute(TaskInfo task) {
final String taskPath = task.getTask().getPath();
LOGGER.info("{} ({}) started.", taskPath, Thread.currentThread());
taskTimer.reset();
processTask(task);
long taskDuration = taskTimer.getElapsedMillis();
busy.addAndGet(taskDuration);
if (LOGGER.isInfoEnabled()) {
LOGGER.info("{} ({}) completed. Took {}.", taskPath, Thread.currentThread(), prettyTime(taskDuration));
}
}
});
}
long total = totalTimer.getElapsedMillis();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Task worker [{}] finished, busy: {}, idle: {}", Thread.currentThread(), prettyTime(busy.get()), prettyTime(total - busy.get()));
}
}
private void processTask(TaskInfo taskInfo) {
try {
taskWorker.execute(taskInfo.getTask());
} catch (Throwable e) {
taskInfo.setExecutionFailure(e);
} finally {
taskExecutionPlan.taskComplete(taskInfo);
}
}
}
}