/*
* JBoss, Home of Professional Open Source.
* Copyright 2014, 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.remoting.management;
import org.jboss.as.protocol.mgmt.support.ManagementChannelShutdownHandle;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.jboss.msc.service.StartException;
/**
* The main purpose of this class is to setup proper service dependencies for shutdown.
*
* In general all services accepting management requests (http or remoting) register here. On shutdown services
* registering the shutdown handles need to use the {@code #prepareShutdown} and then {@code awaitShutdown()} to prevent
* remoting services to shut down before active management requests could complete.
*
* @author Emanuel Muckenhuber
*/
public class ManagementRequestTracker {
private volatile boolean shutdown;
private final List<ManagementChannelShutdownHandle> trackers = Collections.synchronizedList(new ArrayList<ManagementChannelShutdownHandle>());
ManagementRequestTracker() {
//
}
synchronized void reset() throws StartException {
shutdown = false;
}
synchronized void stop() {
shutdown = true;
final List<ManagementChannelShutdownHandle> trackers = new ArrayList<>(this.trackers);
for (final ManagementChannelShutdownHandle tracker : trackers) {
tracker.shutdownNow();
}
this.trackers.clear();
notifyAll();
}
public boolean isShutdown() {
return shutdown;
}
public synchronized void prepareShutdown() {
shutdown = true;
final List<ManagementChannelShutdownHandle> trackers = new ArrayList<>(this.trackers);
for (final ManagementChannelShutdownHandle tracker : trackers) {
tracker.shutdown();
}
}
public synchronized void registerTracker(final ManagementChannelShutdownHandle tracker) {
if (!shutdown) {
trackers.add(tracker);
} else {
tracker.shutdown();
}
}
public synchronized void unregisterTracker(final ManagementChannelShutdownHandle tracker) {
trackers.remove(tracker);
notifyAll();
}
public synchronized boolean awaitShutdown(long timeout, TimeUnit timeUnit) throws InterruptedException {
final long deadline = System.currentTimeMillis() + timeUnit.toMillis(timeout);
for (;;) {
if (shutdown && trackers.isEmpty()) {
return true;
}
final long remaining = deadline - System.currentTimeMillis();
if (remaining <= 0) {
return false;
}
wait(remaining);
}
}
}