/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2010 Sun Microsystems, Inc.
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* Portions copyright 2013 ForgeRock AS.
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*/
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package com.forgerock.opendj.ldap;
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import static com.forgerock.opendj.util.StaticUtils.DEBUG_LOG;
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import static java.util.Collections.newSetFromMap;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.logging.Level;
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import com.forgerock.opendj.util.ReferenceCountedObject;
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/**
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* Checks connection for pending requests that have timed out.
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*/
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final class TimeoutChecker {
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/**
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* Global reference counted instance.
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*/
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static final ReferenceCountedObject<TimeoutChecker> TIMEOUT_CHECKER =
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new ReferenceCountedObject<TimeoutChecker>() {
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@Override
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protected void destroyInstance(final TimeoutChecker instance) {
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instance.shutdown();
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}
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@Override
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protected TimeoutChecker newInstance() {
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return new TimeoutChecker();
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}
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};
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/**
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* Condition variable used for coordinating the timeout thread.
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*/
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private final Object available = new Object();
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/**
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* The connection set must be safe from CMEs because expiring requests can
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* cause the connection to be closed.
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*/
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private final Set<LDAPConnection> connections =
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newSetFromMap(new ConcurrentHashMap<LDAPConnection, Boolean>());
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/**
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* Used to signal thread shutdown.
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*/
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private volatile boolean shutdownRequested = false;
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private TimeoutChecker() {
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final Thread checkerThread = new Thread("OpenDJ LDAP SDK Connection Timeout Checker") {
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@Override
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public void run() {
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DEBUG_LOG.fine("Timeout Checker Starting");
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while (!shutdownRequested) {
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final long currentTime = System.currentTimeMillis();
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long delay = 0;
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for (final LDAPConnection connection : connections) {
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if (DEBUG_LOG.isLoggable(Level.FINER)) {
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DEBUG_LOG.finer("Checking connection " + connection + " delay = "
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+ delay);
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}
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// May update the connections set.
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final long newDelay = connection.cancelExpiredRequests(currentTime);
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if (newDelay > 0) {
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if (delay > 0) {
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delay = Math.min(newDelay, delay);
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} else {
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delay = newDelay;
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}
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}
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}
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try {
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synchronized (available) {
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if (delay <= 0) {
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available.wait();
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} else {
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available.wait(delay);
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}
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}
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} catch (final InterruptedException e) {
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shutdownRequested = true;
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}
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}
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}
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};
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checkerThread.setDaemon(true);
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checkerThread.start();
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}
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void addConnection(final LDAPConnection connection) {
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connections.add(connection);
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signal();
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}
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void removeConnection(final LDAPConnection connection) {
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connections.remove(connection);
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// No need to signal.
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}
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private void shutdown() {
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shutdownRequested = true;
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signal();
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}
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// Wakes the timeout checker if it is sleeping.
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private void signal() {
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synchronized (available) {
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available.notifyAll();
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}
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}
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}
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