/*
* Copyright 2017 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.workers.internal;
import org.gradle.api.Transformer;
import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;
import org.gradle.internal.concurrent.CompositeStoppable;
import org.gradle.util.CollectionUtils;
import java.io.File;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
public class WorkerDaemonClientsManager {
private static final Logger LOGGER = Logging.getLogger(WorkerDaemonFactory.class);
private final Object lock = new Object();
private final List<WorkerDaemonClient> allClients = new ArrayList<WorkerDaemonClient>();
private final List<WorkerDaemonClient> idleClients = new ArrayList<WorkerDaemonClient>();
private WorkerDaemonStarter workerDaemonStarter;
public WorkerDaemonClientsManager(WorkerDaemonStarter workerDaemonStarter) {
this.workerDaemonStarter = workerDaemonStarter;
}
// TODO - should supply and check for the same parameters as passed to reserveNewClient()
public <T extends WorkSpec> WorkerDaemonClient<T> reserveIdleClient(DaemonForkOptions forkOptions) {
return reserveIdleClient(forkOptions, idleClients);
}
WorkerDaemonClient reserveIdleClient(DaemonForkOptions forkOptions, List<WorkerDaemonClient> clients) {
synchronized (lock) {
Iterator<WorkerDaemonClient> it = clients.iterator();
while (it.hasNext()) {
WorkerDaemonClient candidate = it.next();
if (candidate.isCompatibleWith(forkOptions)) {
it.remove();
return candidate;
}
}
return null;
}
}
public <T extends WorkSpec> WorkerDaemonClient<T> reserveNewClient(Class<? extends WorkerProtocol<T>> workerProtocolImplementationClass, File workingDir, DaemonForkOptions forkOptions) {
//allow the daemon to be started concurrently
WorkerDaemonClient client = workerDaemonStarter.startDaemon(workerProtocolImplementationClass, workingDir, forkOptions);
synchronized (lock) {
allClients.add(client);
}
return client;
}
public void release(WorkerDaemonClient client) {
synchronized (lock) {
idleClients.add(client);
}
}
public void stop() {
synchronized (lock) {
LOGGER.debug("Stopping {} worker daemon(s).", allClients.size());
CompositeStoppable.stoppable(allClients).stop();
LOGGER.info("Stopped {} worker daemon(s).", allClients.size());
allClients.clear();
}
}
/**
* Select idle daemon clients to stop.
*
* @param selectionFunction Gets all idle daemon clients, daemons of returned clients are stopped
*/
public void selectIdleClientsToStop(Transformer<List<WorkerDaemonClient>, List<WorkerDaemonClient>> selectionFunction) {
synchronized (lock) {
List<WorkerDaemonClient> sortedClients = CollectionUtils.sort(idleClients, new Comparator<WorkerDaemonClient>() {
@Override
public int compare(WorkerDaemonClient o1, WorkerDaemonClient o2) {
return new Integer(o1.getUses()).compareTo(o2.getUses());
}
});
List<WorkerDaemonClient> clientsToStop = selectionFunction.transform(new ArrayList<WorkerDaemonClient>(sortedClients));
if (!clientsToStop.isEmpty()) {
idleClients.removeAll(clientsToStop);
allClients.removeAll(clientsToStop);
LOGGER.debug("Stopping {} worker daemon(s).", clientsToStop.size());
CompositeStoppable.stoppable(clientsToStop).stop();
LOGGER.info("Stopped {} worker daemon(s).", clientsToStop.size());
}
}
}
}