/hudson-core/src/main/java/hudson/slaves/ConnectionActivityMonitor.java
http://github.com/hudson/hudson · Java · 114 lines · 56 code · 15 blank · 43 comment · 9 complexity · 49694d24d75b55181aea7a8f168c0254 MD5 · raw file
- /*
- * The MIT License
- *
- * Copyright (c) 2004-2009, Sun Microsystems, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
- package hudson.slaves;
- import hudson.model.AsyncPeriodicWork;
- import hudson.model.TaskListener;
- import hudson.model.Hudson;
- import hudson.model.Computer;
- import hudson.util.TimeUnit2;
- import hudson.remoting.VirtualChannel;
- import hudson.remoting.Channel;
- import hudson.remoting.Callable;
- import hudson.Extension;
- import java.io.IOException;
- import java.util.logging.Logger;
- /**
- * Makes sure that connections to slaves are alive, and if they are not, cut them off.
- *
- * <p>
- * If we only rely on TCP retransmission time out for this, the time it takes to detect a bad connection
- * is in the order of 10s of minutes, so we take the matters to our own hands.
- *
- * @author Kohsuke Kawaguchi
- * @since 1.325
- */
- @Extension
- public class ConnectionActivityMonitor extends AsyncPeriodicWork {
- public ConnectionActivityMonitor() {
- super("Connection Activity monitoring to slaves");
- }
- protected void execute(TaskListener listener) throws IOException, InterruptedException {
- if (!enabled) return;
- long now = System.currentTimeMillis();
- for (Computer c: Hudson.getInstance().getComputers()) {
- VirtualChannel ch = c.getChannel();
- if (ch instanceof Channel) {
- Channel channel = (Channel) ch;
- if (now-channel.getLastHeard() > TIME_TILL_PING) {
- // haven't heard from this slave for a while.
- Long lastPing = (Long)channel.getProperty(ConnectionActivityMonitor.class);
- if (lastPing!=null && now-lastPing > TIMEOUT) {
- LOGGER.info("Repeated ping attempts failed on "+c.getName()+". Disconnecting");
- c.disconnect(OfflineCause.create(Messages._ConnectionActivityMonitor_OfflineCause()));
- } else {
- // send a ping. if we receive a reply, it will be reflected in the next getLastHeard() call.
- channel.callAsync(PING_COMMAND);
- if (lastPing==null)
- channel.setProperty(ConnectionActivityMonitor.class,now);
- }
- } else {
- // we are receiving data nicely
- channel.setProperty(ConnectionActivityMonitor.class,null);
- }
- }
- }
- }
- public long getRecurrencePeriod() {
- return enabled ? FREQUENCY : TimeUnit2.DAYS.toMillis(30);
- }
- /**
- * Time till initial ping
- */
- private static final long TIME_TILL_PING = Long.getLong(ConnectionActivityMonitor.class.getName()+".timeToPing",TimeUnit2.MINUTES.toMillis(3));
- private static final long FREQUENCY = Long.getLong(ConnectionActivityMonitor.class.getName()+".frequency",TimeUnit2.SECONDS.toMillis(10));
- /**
- * When do we abandon the effort and cut off?
- */
- private static final long TIMEOUT = Long.getLong(ConnectionActivityMonitor.class.getName()+".timeToPing",TimeUnit2.MINUTES.toMillis(4));
- // disabled by default until proven in the production
- public boolean enabled = Boolean.getBoolean(ConnectionActivityMonitor.class.getName()+".enabled");
- private static final PingCommand PING_COMMAND = new PingCommand();
- private static final class PingCommand implements Callable<Void,RuntimeException> {
- public Void call() throws RuntimeException {
- return null;
- }
- private static final long serialVersionUID = 1L;
- }
- private static final Logger LOGGER = Logger.getLogger(ConnectionActivityMonitor.class.getName());
- }