/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.process;
import java.util.concurrent.TimeUnit;
import org.jboss.as.process.logging.ProcessLogger;
/**
* Policy used to automatically restart a crashed process.
*
* @author Emanuel Muckenhuber
*/
interface RespawnPolicy {
/**
* Respawn a process.
*
* @param count the count of attempted respawns, including this one
* @param process the process to respawn
* @param slowRespawn {@code true} if longer delays between respawn attempts are ok
* @param unlimited {@code true} if there should be no limit on the number of respawn attempts
*/
void respawn(int count, ManagedProcess process, boolean slowRespawn, boolean unlimited);
RespawnPolicy NONE = new RespawnPolicy() {
@Override
public void respawn(final int count, final ManagedProcess process, boolean slowRespawn, boolean unlimited) {
ProcessLogger.SERVER_LOGGER.tracef("not trying to respawn process %s.", process.getProcessName());
}
};
RespawnPolicy RESPAWN = new RespawnPolicy() {
private static final int MAX_NORMAL_WAIT = 30;
private static final int MAX_SLOW_WAIT = 300;
private static final int MAX_RESTARTS = 10;
private final int[] NORMAL_WAITS = { 1, 5, 10, 15, MAX_NORMAL_WAIT };
private final int[] SLOW_WAITS = { 15, 15, 30, 60, MAX_SLOW_WAIT };
@Override
public void respawn(final int count, final ManagedProcess process, boolean slowRespawn, boolean unlimited) {
if (unlimited || count <= MAX_RESTARTS) {
try {
final int[] waits = slowRespawn ? SLOW_WAITS : NORMAL_WAITS;
int waitPeriod;
if (count <= waits.length) {
waitPeriod = waits[count - 1];
} else {
waitPeriod = slowRespawn ? MAX_SLOW_WAIT : MAX_NORMAL_WAIT;
}
ProcessLogger.SERVER_LOGGER.waitingToRestart(waitPeriod, process.getProcessName());
TimeUnit.SECONDS.sleep(waitPeriod);
} catch (InterruptedException e) {
return;
}
process.respawn();
}
}
};
}