gradle-master/subprojects/launcher/src/main/java/org/gradle/launcher/daemon/server/api/HandleStop.java
/*
 * Copyright 2015 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.launcher.daemon.server.api;

import org.gradle.internal.event.ListenerManager;
import org.gradle.launcher.daemon.protocol.Stop;
import org.gradle.launcher.daemon.protocol.StopWhenIdle;
import org.gradle.launcher.daemon.protocol.Success;
import org.gradle.launcher.daemon.server.expiry.DaemonExpirationListener;
import org.gradle.launcher.daemon.server.expiry.DaemonExpirationResult;
import org.gradle.launcher.daemon.server.expiry.DaemonExpirationStatus;

public class HandleStop implements DaemonCommandAction {
    private final DaemonExpirationListener listenerBroadcast;

    public static final String EXPIRATION_REASON = "stop command received";

    public HandleStop(ListenerManager listenerManager) {
        this.listenerBroadcast = listenerManager.getBroadcaster(DaemonExpirationListener.class);
    }

    @Override
    public void execute(DaemonCommandExecution execution) {
        if (execution.getCommand() instanceof Stop) {
            listenerBroadcast.onExpirationEvent(new DaemonExpirationResult(DaemonExpirationStatus.IMMEDIATE_EXPIRE, EXPIRATION_REASON));
            execution.getConnection().completed(new Success(null));
        } else if (execution.getCommand() instanceof StopWhenIdle) {
            hangShutdownForTesting();
            listenerBroadcast.onExpirationEvent(new DaemonExpirationResult(DaemonExpirationStatus.GRACEFUL_EXPIRE, EXPIRATION_REASON));
            execution.getConnection().completed(new Success(null));
        } else {
            execution.proceed();
        }
    }

    private void hangShutdownForTesting() {
        // For testing purposes, if this system property is set, the daemon will wait the specified
        // number of milliseconds before continuing to shutdown. This simulates builds for daemons
        // that are very slow to respond.
        int hang = Integer.getInteger("org.gradle.internal.testing.daemon.hang", 0);
        if (hang > 0) {
            try {
                Thread.sleep(hang);
            } catch (InterruptedException e) {
                // ignore
            }
        }
    }
}
