org.smallmind.memcached.cubby.ServerDefibrillator Maven / Gradle / Ivy
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/*
* Copyright (c) 2007 through 2024 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* .
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
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package org.smallmind.memcached.cubby;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.LinkedList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.smallmind.scribe.pen.LoggerManager;
public class ServerDefibrillator implements Runnable {
private final CountDownLatch finishedLatch = new CountDownLatch(1);
private final CountDownLatch terminatedLatch = new CountDownLatch(1);
private final ConnectionCoordinator connectionCoordinator;
private final ServerPool serverPool;
private final long resuscitationSeconds;
private final int connectionTimeoutMilliseconds;
private final int readTimeoutMilliseconds;
public ServerDefibrillator (ConnectionCoordinator connectionCoordinator, CubbyConfiguration configuration, ServerPool serverPool) {
this.connectionCoordinator = connectionCoordinator;
this.serverPool = serverPool;
this.connectionTimeoutMilliseconds = (int)configuration.getConnectionTimeoutMilliseconds();
this.readTimeoutMilliseconds = (int)configuration.getReadTimeoutMilliseconds();
this.resuscitationSeconds = configuration.getResuscitationSeconds();
}
public void stop ()
throws InterruptedException {
finishedLatch.countDown();
terminatedLatch.await();
}
@Override
public void run () {
try {
while (!finishedLatch.await(resuscitationSeconds, TimeUnit.SECONDS)) {
LinkedList reconnectionList = new LinkedList<>();
for (HostControl hostControl : serverPool.values()) {
if (!hostControl.isActive()) {
try (Socket socket = new Socket()) {
// In case disconnection was due to a change in downstream load balancing
InetSocketAddress constructedAddress;
socket.setSoTimeout(readTimeoutMilliseconds);
socket.connect(constructedAddress = hostControl.getMemcachedHost().constructAddress(), connectionTimeoutMilliseconds);
reconnectionList.add(hostControl.getMemcachedHost().regenerate(constructedAddress));
} catch (IOException ioException) {
// do nothing
}
}
}
if (!reconnectionList.isEmpty()) {
for (MemcachedHost memcachedHost : reconnectionList) {
try {
connectionCoordinator.reconnect(memcachedHost);
} catch (IOException | CubbyOperationException exception) {
LoggerManager.getLogger(ServerDefibrillator.class).error(exception);
}
}
}
}
} catch (InterruptedException interruptedException) {
finishedLatch.countDown();
LoggerManager.getLogger(ServerDefibrillator.class).error(interruptedException);
} finally {
LoggerManager.getLogger(ServerDefibrillator.class).info("%s stopping...", ServerDefibrillator.class.getName());
terminatedLatch.countDown();
}
}
}