/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, 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.host.controller.mgmt;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.jboss.as.host.controller.logging.HostControllerLogger;
import org.jboss.as.protocol.StreamUtils;
import org.jboss.as.protocol.mgmt.ManagementChannelHandler;
import org.jboss.as.protocol.mgmt.ManagementPingRequest;
import org.jboss.remoting3.Channel;
import org.jboss.threads.AsyncFuture;
import org.wildfly.security.manager.WildFlySecurityManager;
/**
* Coordinates periodic pinging of a slave Host Controller to validate its connection
*
* @author Brian Stansberry (c) 2011 Red Hat Inc.
*/
public class SlaveHostPinger {
public static final long STD_INTERVAL;
public static final long STD_TIMEOUT;
public static final long SHORT_TIMEOUT = 10000;
static {
long interval = -1;
try {
interval = Long.parseLong(WildFlySecurityManager.getPropertyPrivileged("jboss.as.domain.ping.interval", "15000"));
} catch (Exception e) {
// TODO log
} finally {
// add 500 ms to provided interval to help allow the slave pings to prevent the need for master pings
STD_INTERVAL = interval > 0 ? interval + 500 : 15500;
}
long timeout = -1;
try {
timeout = Long.parseLong(WildFlySecurityManager.getPropertyPrivileged("jboss.as.domain.ping.timeout", "30000"));
} catch (Exception e) {
// TODO log
} finally {
STD_TIMEOUT = timeout > 0 ? timeout : 30000;
}
}
private final String hostName;
private final ManagementChannelHandler channelHandler;
private final ScheduledExecutorService scheduler;
private volatile Long remoteConnectionID;
private volatile boolean cancelled;
public SlaveHostPinger(String hostName, ManagementChannelHandler channelHandler, ScheduledExecutorService scheduler, long remoteConnectionID) {
this.hostName = hostName;
this.channelHandler = channelHandler;
this.scheduler = scheduler;
this.remoteConnectionID = remoteConnectionID;
}
public Long getRemoteConnectionID() {
return remoteConnectionID;
}
public void schedulePing(long timeout, long delay) {
PingTask task = new PingTask(timeout, delay);
scheduler.schedule(task, delay, TimeUnit.MILLISECONDS);
}
public boolean isCancelled() {
return cancelled;
}
public void cancel() {
this.cancelled = true;
}
private class PingTask implements Runnable {
private final long timeout;
private final long interval;
private PingTask(long timeout, long interval) {
this.timeout = timeout;
this.interval = interval;
}
@Override
public void run() {
if (!cancelled) {
boolean fail = false;
AsyncFuture<Long> future = null;
try {
if (interval < 1 || System.currentTimeMillis() - channelHandler.getLastMessageReceivedTime() > interval) {
future = channelHandler.executeRequest(ManagementPingRequest.INSTANCE, null).getResult();
Long id = future.get(timeout, TimeUnit.MILLISECONDS);
if (!cancelled && remoteConnectionID != null && !remoteConnectionID.equals(id)) {
HostControllerLogger.DOMAIN_LOGGER.slaveHostControllerChanged(hostName);
fail = true;
} else {
remoteConnectionID = id;
}
}
} catch (IOException e) {
HostControllerLogger.DOMAIN_LOGGER.debug("Caught exception sending ping request", e);
} catch (InterruptedException e) {
safeCancel(future);
Thread.currentThread().interrupt();
} catch (ExecutionException e) {
HostControllerLogger.DOMAIN_LOGGER.debug("Caught exception sending ping request", e);
} catch (TimeoutException e) {
if (!cancelled) {
fail = true;
HostControllerLogger.DOMAIN_LOGGER.slaveHostControllerUnreachable(hostName, timeout);
}
safeCancel(future);
} finally {
if (fail) {
Channel channel = null;
try {
channel = channelHandler.getChannel();
} catch (IOException e) {
// ignore; shouldn't happen as the channel is already established if this task is running
}
StreamUtils.safeClose(channel);
} else if (!cancelled && interval > 0) {
scheduler.schedule(this, interval, TimeUnit.MILLISECONDS);
}
}
}
}
void safeCancel(Future<?> future) {
if (future != null) {
future.cancel(true);
}
}
}
}