aprendpoint.java

业界著名的tomcat服务器的最新6.0的源代码。

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.tomcat.util.net;

import java.net.InetAddress;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.concurrent.Executor;

import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.jni.Address;
import org.apache.tomcat.jni.Error;
import org.apache.tomcat.jni.File;
import org.apache.tomcat.jni.Library;
import org.apache.tomcat.jni.OS;
import org.apache.tomcat.jni.Poll;
import org.apache.tomcat.jni.Pool;
import org.apache.tomcat.jni.SSL;
import org.apache.tomcat.jni.SSLContext;
import org.apache.tomcat.jni.SSLSocket;
import org.apache.tomcat.jni.Socket;
import org.apache.tomcat.jni.Status;
import org.apache.tomcat.util.res.StringManager;

/**
 * APR tailored thread pool, providing the following services:
 * <ul>
 * <li>Socket acceptor thread</li>
 * <li>Socket poller thread</li>
 * <li>Sendfile thread</li>
 * <li>Worker threads pool</li>
 * </ul>
 *
 * When switching to Java 5, there's an opportunity to use the virtual
 * machine's thread pool.
 *
 * @author Mladen Turk
 * @author Remy Maucherat
 */
public class AprEndpoint {


    // -------------------------------------------------------------- Constants


    protected static Log log = LogFactory.getLog(AprEndpoint.class);

    protected static StringManager sm =
        StringManager.getManager("org.apache.tomcat.util.net.res");


    /**
     * The Request attribute key for the cipher suite.
     */
    public static final String CIPHER_SUITE_KEY = "javax.servlet.request.cipher_suite";

    /**
     * The Request attribute key for the key size.
     */
    public static final String KEY_SIZE_KEY = "javax.servlet.request.key_size";

    /**
     * The Request attribute key for the client certificate chain.
     */
    public static final String CERTIFICATE_KEY = "javax.servlet.request.X509Certificate";

    /**
     * The Request attribute key for the session id.
     * This one is a Tomcat extension to the Servlet spec.
     */
    public static final String SESSION_ID_KEY = "javax.servlet.request.ssl_session";


    // ----------------------------------------------------------------- Fields


    /**
     * Available workers.
     */
    protected WorkerStack workers = null;


    /**
     * Running state of the endpoint.
     */
    protected volatile boolean running = false;


    /**
     * Will be set to true whenever the endpoint is paused.
     */
    protected volatile boolean paused = false;


    /**
     * Track the initialization state of the endpoint.
     */
    protected boolean initialized = false;


    /**
     * Current worker threads busy count.
     */
    protected int curThreadsBusy = 0;


    /**
     * Current worker threads count.
     */
    protected int curThreads = 0;


    /**
     * Sequence number used to generate thread names.
     */
    protected int sequence = 0;


    /**
     * Root APR memory pool.
     */
    protected long rootPool = 0;


    /**
     * Server socket "pointer".
     */
    protected long serverSock = 0;


    /**
     * APR memory pool for the server socket.
     */
    protected long serverSockPool = 0;


    /**
     * SSL context.
     */
    protected long sslContext = 0;


    // ------------------------------------------------------------- Properties


    /**
     * External Executor based thread pool.
     */
    protected Executor executor = null;
    public void setExecutor(Executor executor) { this.executor = executor; }
    public Executor getExecutor() { return executor; }


    /**
     * Maximum amount of worker threads.
     */
    protected int maxThreads = 40;
    public void setMaxThreads(int maxThreads) { this.maxThreads = maxThreads; }
    public int getMaxThreads() { return maxThreads; }


    /**
     * Priority of the acceptor and poller threads.
     */
    protected int threadPriority = Thread.NORM_PRIORITY;
    public void setThreadPriority(int threadPriority) { this.threadPriority = threadPriority; }
    public int getThreadPriority() { return threadPriority; }


    /**
     * Size of the socket poller.
     */
    protected int pollerSize = 8 * 1024;
    public void setPollerSize(int pollerSize) { this.pollerSize = pollerSize; }
    public int getPollerSize() { return pollerSize; }


    /**
     * Size of the sendfile (= concurrent files which can be served).
     */
    protected int sendfileSize = 1 * 1024;
    public void setSendfileSize(int sendfileSize) { this.sendfileSize = sendfileSize; }
    public int getSendfileSize() { return sendfileSize; }


    /**
     * Server socket port.
     */
    protected int port;
    public int getPort() { return port; }
    public void setPort(int port ) { this.port=port; }


    /**
     * Address for the server socket.
     */
    protected InetAddress address;
    public InetAddress getAddress() { return address; }
    public void setAddress(InetAddress address) { this.address = address; }


    /**
     * Handling of accepted sockets.
     */
    protected Handler handler = null;
    public void setHandler(Handler handler ) { this.handler = handler; }
    public Handler getHandler() { return handler; }


    /**
     * Allows the server developer to specify the backlog that
     * should be used for server sockets. By default, this value
     * is 100.
     */
    protected int backlog = 100;
    public void setBacklog(int backlog) { if (backlog > 0) this.backlog = backlog; }
    public int getBacklog() { return backlog; }


    /**
     * Socket TCP no delay.
     */
    protected boolean tcpNoDelay = false;
    public boolean getTcpNoDelay() { return tcpNoDelay; }
    public void setTcpNoDelay(boolean tcpNoDelay) { this.tcpNoDelay = tcpNoDelay; }


    /**
     * Socket linger.
     */
    protected int soLinger = 100;
    public int getSoLinger() { return soLinger; }
    public void setSoLinger(int soLinger) { this.soLinger = soLinger; }


    /**
     * Socket timeout.
     */
    protected int soTimeout = -1;
    public int getSoTimeout() { return soTimeout; }
    public void setSoTimeout(int soTimeout) { this.soTimeout = soTimeout; }


    /**
     * Keep-Alive timeout.
     */
    protected int keepAliveTimeout = -1;
    public int getKeepAliveTimeout() { return keepAliveTimeout; }
    public void setKeepAliveTimeout(int keepAliveTimeout) { this.keepAliveTimeout = keepAliveTimeout; }


    /**
     * Timeout on first request read before going to the poller, in ms.
     */
    protected int firstReadTimeout = -1;
    public int getFirstReadTimeout() { return firstReadTimeout; }
    public void setFirstReadTimeout(int firstReadTimeout) { this.firstReadTimeout = firstReadTimeout; }


    /**
     * Poll interval, in microseconds. The smaller the value, the more CPU the poller
     * will use, but the more responsive to activity it will be.
     */
    protected int pollTime = 2000;
    public int getPollTime() { return pollTime; }
    public void setPollTime(int pollTime) { if (pollTime > 0) { this.pollTime = pollTime; } }


    /**
     * The default is true - the created threads will be
     *  in daemon mode. If set to false, the control thread
     *  will not be daemon - and will keep the process alive.
     */
    protected boolean daemon = true;
    public void setDaemon(boolean b) { daemon = b; }
    public boolean getDaemon() { return daemon; }


    /**
     * Name of the thread pool, which will be used for naming child threads.
     */
    protected String name = "TP";
    public void setName(String name) { this.name = name; }
    public String getName() { return name; }


    /**
     * Use endfile for sending static files.
     */
    protected boolean useSendfile = Library.APR_HAS_SENDFILE;
    public void setUseSendfile(boolean useSendfile) { this.useSendfile = useSendfile; }
    public boolean getUseSendfile() { return useSendfile; }


    /**
     * Allow comet request handling.
     */
    protected boolean useComet = true;
    public void setUseComet(boolean useComet) { this.useComet = useComet; }
    public boolean getUseComet() { return useComet; }


    /**
     * Acceptor thread count.
     */
    protected int acceptorThreadCount = 0;
    public void setAcceptorThreadCount(int acceptorThreadCount) { this.acceptorThreadCount = acceptorThreadCount; }
    public int getAcceptorThreadCount() { return acceptorThreadCount; }


    /**
     * Sendfile thread count.
     */
    protected int sendfileThreadCount = 0;
    public void setSendfileThreadCount(int sendfileThreadCount) { this.sendfileThreadCount = sendfileThreadCount; }
    public int getSendfileThreadCount() { return sendfileThreadCount; }


    /**
     * Poller thread count.
     */
    protected int pollerThreadCount = 0;
    public void setPollerThreadCount(int pollerThreadCount) { this.pollerThreadCount = pollerThreadCount; }
    public int getPollerThreadCount() { return pollerThreadCount; }


    /**
     * The socket poller.
     */
    protected Poller[] pollers = null;
    protected int pollerRoundRobin = 0;
    public Poller getPoller() {
        pollerRoundRobin = (pollerRoundRobin + 1) % pollers.length;
        return pollers[pollerRoundRobin];
    }


    /**
     * The socket poller used for Comet support.
     */
    protected Poller[] cometPollers = null;
    protected int cometPollerRoundRobin = 0;
    public Poller getCometPoller() {
        cometPollerRoundRobin = (cometPollerRoundRobin + 1) % cometPollers.length;
        return cometPollers[cometPollerRoundRobin];
    }


    /**
     * The static file sender.
     */
    protected Sendfile[] sendfiles = null;
    protected int sendfileRoundRobin = 0;
    public Sendfile getSendfile() {
        sendfileRoundRobin = (sendfileRoundRobin + 1) % sendfiles.length;
        return sendfiles[sendfileRoundRobin];
    }


    /**
     * Dummy maxSpareThreads property.
     */
    public int getMaxSpareThreads() { return 0; }


    /**
     * Dummy minSpareThreads property.
     */
    public int getMinSpareThreads() { return 0; }