934 lines
32 KiB
Java
934 lines
32 KiB
Java
/*
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* Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.net.*;
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import java.io.*;
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import java.nio.*;
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import java.nio.channels.*;
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import sun.net.www.MessageHeader;
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import java.util.*;
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import javax.net.ssl.*;
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import javax.net.ssl.SSLEngineResult.*;
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import java.security.*;
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/**
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* This class implements a simple HTTPS server. It uses multiple threads to
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* handle connections in parallel, and will spin off a new thread to handle
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* each request. (this is easier to implement with SSLEngine)
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* <p>
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* It must be instantiated with a {@link HttpCallback} object to which
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* requests are given and must be handled.
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* <p>
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* Simple synchronization between the client(s) and server can be done
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* using the {@link #waitForCondition(String)}, {@link #setCondition(String)} and
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* {@link #rendezvous(String,int)} methods.
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*
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* NOTE NOTE NOTE NOTE NOTE NOTE NOTE
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*
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* If you make a change in here, please don't forget to make the
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* corresponding change in the J2SE equivalent.
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*
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* NOTE NOTE NOTE NOTE NOTE NOTE NOTE
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*/
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public class TestHttpsServer {
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ServerSocketChannel schan;
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int threads;
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int cperthread;
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HttpCallback cb;
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Server[] servers;
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// ssl related fields
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static SSLContext sslCtx;
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/**
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* Create a <code>TestHttpsServer<code> instance with the specified callback object
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* for handling requests. One thread is created to handle requests,
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* and up to ten TCP connections will be handled simultaneously.
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* @param cb the callback object which is invoked to handle each
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* incoming request
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*/
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public TestHttpsServer (HttpCallback cb) throws IOException {
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this (cb, 1, 10, 0);
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}
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/**
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* Create a <code>TestHttpsServer<code> instance with the specified number of
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* threads and maximum number of connections per thread. This functions
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* the same as the 4 arg constructor, where the port argument is set to zero.
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* @param cb the callback object which is invoked to handle each
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* incoming request
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* @param threads the number of threads to create to handle requests
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* in parallel
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* @param cperthread the number of simultaneous TCP connections to
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* handle per thread
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*/
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public TestHttpsServer (HttpCallback cb, int threads, int cperthread)
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throws IOException {
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this (cb, threads, cperthread, 0);
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}
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/**
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* Create a <code>TestHttpsServer<code> instance with the specified number
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* of threads and maximum number of connections per thread and running on
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* the specified port. The specified number of threads are created to
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* handle incoming requests, and each thread is allowed
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* to handle a number of simultaneous TCP connections.
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* @param cb the callback object which is invoked to handle
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* each incoming request
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* @param threads the number of threads to create to handle
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* requests in parallel
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* @param cperthread the number of simultaneous TCP connections
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* to handle per thread
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* @param port the port number to bind the server to. <code>Zero</code>
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* means choose any free port.
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*/
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public TestHttpsServer (HttpCallback cb, int threads, int cperthread, int port)
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throws IOException {
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schan = ServerSocketChannel.open ();
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InetSocketAddress addr = new InetSocketAddress (port);
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schan.socket().bind (addr);
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this.threads = threads;
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this.cb = cb;
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this.cperthread = cperthread;
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try {
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// create and initialize a SSLContext
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KeyStore ks = KeyStore.getInstance("JKS");
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KeyStore ts = KeyStore.getInstance("JKS");
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char[] passphrase = "passphrase".toCharArray();
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ks.load(new FileInputStream(System.getProperty("javax.net.ssl.keyStore")), passphrase);
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ts.load(new FileInputStream(System.getProperty("javax.net.ssl.trustStore")), passphrase);
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KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
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kmf.init(ks, passphrase);
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TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
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tmf.init(ts);
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sslCtx = SSLContext.getInstance("TLS");
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sslCtx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
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servers = new Server [threads];
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for (int i=0; i<threads; i++) {
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servers[i] = new Server (cb, schan, cperthread);
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servers[i].start();
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}
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} catch (Exception ex) {
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throw new RuntimeException("test failed. cause: "+ex.getMessage());
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}
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}
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/** Tell all threads in the server to exit within 5 seconds.
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* This is an abortive termination. Just prior to the thread exiting
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* all channels in that thread waiting to be closed are forceably closed.
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*/
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public void terminate () {
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for (int i=0; i<threads; i++) {
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servers[i].terminate ();
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}
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}
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/**
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* return the local port number to which the server is bound.
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* @return the local port number
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*/
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public int getLocalPort () {
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return schan.socket().getLocalPort ();
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}
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static class Server extends Thread {
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ServerSocketChannel schan;
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Selector selector;
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SelectionKey listenerKey;
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SelectionKey key; /* the current key being processed */
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HttpCallback cb;
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ByteBuffer consumeBuffer;
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int maxconn;
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int nconn;
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ClosedChannelList clist;
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boolean shutdown;
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Server (HttpCallback cb, ServerSocketChannel schan, int maxconn) {
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this.schan = schan;
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this.maxconn = maxconn;
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this.cb = cb;
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nconn = 0;
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consumeBuffer = ByteBuffer.allocate (512);
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clist = new ClosedChannelList ();
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try {
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selector = Selector.open ();
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schan.configureBlocking (false);
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listenerKey = schan.register (selector, SelectionKey.OP_ACCEPT);
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} catch (IOException e) {
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System.err.println ("Server could not start: " + e);
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}
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}
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/* Stop the thread as soon as possible */
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public synchronized void terminate () {
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shutdown = true;
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}
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public void run () {
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try {
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while (true) {
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selector.select (1000);
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Set selected = selector.selectedKeys();
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Iterator iter = selected.iterator();
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while (iter.hasNext()) {
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key = (SelectionKey)iter.next();
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if (key.equals (listenerKey)) {
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SocketChannel sock = schan.accept ();
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if (sock == null) {
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/* false notification */
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iter.remove();
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continue;
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}
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sock.configureBlocking (true);
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SSLEngine sslEng = sslCtx.createSSLEngine();
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sslEng.setUseClientMode(false);
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new ServerWorker(cb, sock, sslEng).start();
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nconn ++;
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if (nconn == maxconn) {
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/* deregister */
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listenerKey.cancel ();
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listenerKey = null;
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}
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} else {
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if (key.isReadable()) {
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boolean closed = false;
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SocketChannel chan = (SocketChannel) key.channel();
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if (key.attachment() != null) {
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closed = consume (chan);
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}
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if (closed) {
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chan.close ();
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key.cancel ();
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if (nconn == maxconn) {
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listenerKey = schan.register (selector, SelectionKey.OP_ACCEPT);
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}
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nconn --;
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}
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}
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}
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iter.remove();
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}
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clist.check();
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synchronized (this) {
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if (shutdown) {
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clist.terminate ();
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return;
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}
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}
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}
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} catch (IOException e) {
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System.out.println ("Server exception: " + e);
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// TODO finish
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}
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}
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/* read all the data off the channel without looking at it
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* return true if connection closed
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*/
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boolean consume (SocketChannel chan) {
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try {
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consumeBuffer.clear ();
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int c = chan.read (consumeBuffer);
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if (c == -1)
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return true;
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} catch (IOException e) {
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return true;
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}
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return false;
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}
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}
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static class ServerWorker extends Thread {
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private ByteBuffer inNetBB;
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private ByteBuffer outNetBB;
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private ByteBuffer inAppBB;
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private ByteBuffer outAppBB;
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SSLEngine sslEng;
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SocketChannel schan;
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HttpCallback cb;
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HandshakeStatus currentHSStatus;
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boolean initialHSComplete;
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/*
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* All inbound data goes through this buffer.
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*
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* It might be nice to use a cache of ByteBuffers so we're
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* not alloc/dealloc'ing all over the place.
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*/
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/*
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* Application buffers, also used for handshaking
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*/
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private int appBBSize;
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ServerWorker (HttpCallback cb, SocketChannel schan, SSLEngine sslEng) {
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this.sslEng = sslEng;
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this.schan = schan;
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this.cb = cb;
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currentHSStatus = HandshakeStatus.NEED_UNWRAP;
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initialHSComplete = false;
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int netBBSize = sslEng.getSession().getPacketBufferSize();
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inNetBB = ByteBuffer.allocate(netBBSize);
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outNetBB = ByteBuffer.allocate(netBBSize);
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appBBSize = sslEng.getSession().getApplicationBufferSize();
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inAppBB = ByteBuffer.allocate(appBBSize);
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outAppBB = ByteBuffer.allocate(appBBSize);
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}
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public SSLEngine getSSLEngine() {
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return sslEng;
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}
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public ByteBuffer outNetBB() {
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return outNetBB;
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}
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public ByteBuffer outAppBB() {
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return outAppBB;
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}
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public void run () {
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try {
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SSLEngineResult result;
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while (!initialHSComplete) {
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switch (currentHSStatus) {
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case NEED_UNWRAP:
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int bytes = schan.read(inNetBB);
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needIO:
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while (currentHSStatus == HandshakeStatus.NEED_UNWRAP) {
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/*
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* Don't need to resize requestBB, since no app data should
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* be generated here.
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*/
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inNetBB.flip();
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result = sslEng.unwrap(inNetBB, inAppBB);
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inNetBB.compact();
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currentHSStatus = result.getHandshakeStatus();
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switch (result.getStatus()) {
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case OK:
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switch (currentHSStatus) {
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case NOT_HANDSHAKING:
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throw new IOException(
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"Not handshaking during initial handshake");
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case NEED_TASK:
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Runnable task;
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while ((task = sslEng.getDelegatedTask()) != null) {
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task.run();
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currentHSStatus = sslEng.getHandshakeStatus();
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}
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break;
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}
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break;
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case BUFFER_UNDERFLOW:
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break needIO;
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default: // BUFFER_OVERFLOW/CLOSED:
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throw new IOException("Received" + result.getStatus() +
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"during initial handshaking");
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}
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}
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/*
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* Just transitioned from read to write.
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*/
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if (currentHSStatus != HandshakeStatus.NEED_WRAP) {
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break;
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}
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// Fall through and fill the write buffer.
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case NEED_WRAP:
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/*
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* The flush above guarantees the out buffer to be empty
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*/
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outNetBB.clear();
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result = sslEng.wrap(inAppBB, outNetBB);
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outNetBB.flip();
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schan.write (outNetBB);
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outNetBB.compact();
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currentHSStatus = result.getHandshakeStatus();
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switch (result.getStatus()) {
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case OK:
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if (currentHSStatus == HandshakeStatus.NEED_TASK) {
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Runnable task;
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while ((task = sslEng.getDelegatedTask()) != null) {
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task.run();
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currentHSStatus = sslEng.getHandshakeStatus();
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}
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}
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break;
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default: // BUFFER_OVERFLOW/BUFFER_UNDERFLOW/CLOSED:
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throw new IOException("Received" + result.getStatus() +
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"during initial handshaking");
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}
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break;
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case FINISHED:
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initialHSComplete = true;
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break;
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default: // NOT_HANDSHAKING/NEED_TASK
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throw new RuntimeException("Invalid Handshaking State" +
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currentHSStatus);
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} // switch
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}
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// read the application data; using non-blocking mode
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schan.configureBlocking(false);
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read(schan, sslEng);
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} catch (Exception ex) {
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throw new RuntimeException(ex);
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}
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}
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/* return true if the connection is closed, false otherwise */
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private boolean read (SocketChannel chan, SSLEngine sslEng) {
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HttpTransaction msg;
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boolean res;
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try {
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InputStream is = new BufferedInputStream (new NioInputStream (chan, sslEng, inNetBB, inAppBB));
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String requestline = readLine (is);
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MessageHeader mhead = new MessageHeader (is);
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String clen = mhead.findValue ("Content-Length");
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String trferenc = mhead.findValue ("Transfer-Encoding");
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String data = null;
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if (trferenc != null && trferenc.equals ("chunked"))
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data = new String (readChunkedData (is));
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else if (clen != null)
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data = new String (readNormalData (is, Integer.parseInt (clen)));
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String[] req = requestline.split (" ");
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if (req.length < 2) {
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/* invalid request line */
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return false;
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}
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String cmd = req[0];
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URI uri = null;
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try {
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uri = new URI (req[1]);
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msg = new HttpTransaction (this, cmd, uri, mhead, data, null, chan);
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cb.request (msg);
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} catch (URISyntaxException e) {
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System.err.println ("Invalid URI: " + e);
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msg = new HttpTransaction (this, cmd, null, null, null, null, chan);
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msg.sendResponse (501, "Whatever");
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}
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res = false;
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} catch (IOException e) {
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res = true;
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}
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return res;
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}
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byte[] readNormalData (InputStream is, int len) throws IOException {
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byte [] buf = new byte [len];
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int c, off=0, remain=len;
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while (remain > 0 && ((c=is.read (buf, off, remain))>0)) {
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remain -= c;
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off += c;
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}
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return buf;
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}
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|
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private void readCRLF(InputStream is) throws IOException {
|
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int cr = is.read();
|
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int lf = is.read();
|
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|
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if (((cr & 0xff) != 0x0d) ||
|
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((lf & 0xff) != 0x0a)) {
|
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throw new IOException(
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"Expected <CR><LF>: got '" + cr + "/" + lf + "'");
|
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}
|
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}
|
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|
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byte[] readChunkedData (InputStream is) throws IOException {
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LinkedList l = new LinkedList ();
|
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int total = 0;
|
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for (int len=readChunkLen(is); len!=0; len=readChunkLen(is)) {
|
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l.add (readNormalData(is, len));
|
|
total += len;
|
|
readCRLF(is); // CRLF at end of chunk
|
|
}
|
|
readCRLF(is); // CRLF at end of Chunked Stream.
|
|
byte[] buf = new byte [total];
|
|
Iterator i = l.iterator();
|
|
int x = 0;
|
|
while (i.hasNext()) {
|
|
byte[] b = (byte[])i.next();
|
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System.arraycopy (b, 0, buf, x, b.length);
|
|
x += b.length;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
private int readChunkLen (InputStream is) throws IOException {
|
|
int c, len=0;
|
|
boolean done=false, readCR=false;
|
|
while (!done) {
|
|
c = is.read ();
|
|
if (c == '\n' && readCR) {
|
|
done = true;
|
|
} else {
|
|
if (c == '\r' && !readCR) {
|
|
readCR = true;
|
|
} else {
|
|
int x=0;
|
|
if (c >= 'a' && c <= 'f') {
|
|
x = c - 'a' + 10;
|
|
} else if (c >= 'A' && c <= 'F') {
|
|
x = c - 'A' + 10;
|
|
} else if (c >= '0' && c <= '9') {
|
|
x = c - '0';
|
|
}
|
|
len = len * 16 + x;
|
|
}
|
|
}
|
|
}
|
|
return len;
|
|
}
|
|
|
|
private String readLine (InputStream is) throws IOException {
|
|
boolean done=false, readCR=false;
|
|
byte[] b = new byte [512];
|
|
int c, l = 0;
|
|
|
|
while (!done) {
|
|
c = is.read ();
|
|
if (c == '\n' && readCR) {
|
|
done = true;
|
|
} else {
|
|
if (c == '\r' && !readCR) {
|
|
readCR = true;
|
|
} else {
|
|
b[l++] = (byte)c;
|
|
}
|
|
}
|
|
}
|
|
return new String (b);
|
|
}
|
|
|
|
/** close the channel associated with the current key by:
|
|
* 1. shutdownOutput (send a FIN)
|
|
* 2. mark the key so that incoming data is to be consumed and discarded
|
|
* 3. After a period, close the socket
|
|
*/
|
|
|
|
synchronized void orderlyCloseChannel (SocketChannel ch) throws IOException {
|
|
ch.socket().shutdownOutput();
|
|
}
|
|
|
|
synchronized void abortiveCloseChannel (SocketChannel ch) throws IOException {
|
|
Socket s = ch.socket ();
|
|
s.setSoLinger (true, 0);
|
|
ch.close();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Implements blocking reading semantics on top of a non-blocking channel
|
|
*/
|
|
|
|
static class NioInputStream extends InputStream {
|
|
SSLEngine sslEng;
|
|
SocketChannel channel;
|
|
Selector selector;
|
|
ByteBuffer inNetBB;
|
|
ByteBuffer inAppBB;
|
|
SelectionKey key;
|
|
int available;
|
|
byte[] one;
|
|
boolean closed;
|
|
ByteBuffer markBuf; /* reads may be satisifed from this buffer */
|
|
boolean marked;
|
|
boolean reset;
|
|
int readlimit;
|
|
|
|
public NioInputStream (SocketChannel chan, SSLEngine sslEng, ByteBuffer inNetBB, ByteBuffer inAppBB) throws IOException {
|
|
this.sslEng = sslEng;
|
|
this.channel = chan;
|
|
selector = Selector.open();
|
|
this.inNetBB = inNetBB;
|
|
this.inAppBB = inAppBB;
|
|
key = chan.register (selector, SelectionKey.OP_READ);
|
|
available = 0;
|
|
one = new byte[1];
|
|
closed = marked = reset = false;
|
|
}
|
|
|
|
public synchronized int read (byte[] b) throws IOException {
|
|
return read (b, 0, b.length);
|
|
}
|
|
|
|
public synchronized int read () throws IOException {
|
|
return read (one, 0, 1);
|
|
}
|
|
|
|
public synchronized int read (byte[] b, int off, int srclen) throws IOException {
|
|
|
|
int canreturn, willreturn;
|
|
|
|
if (closed)
|
|
return -1;
|
|
|
|
if (reset) { /* satisfy from markBuf */
|
|
canreturn = markBuf.remaining ();
|
|
willreturn = canreturn>srclen ? srclen : canreturn;
|
|
markBuf.get(b, off, willreturn);
|
|
if (canreturn == willreturn) {
|
|
reset = false;
|
|
}
|
|
} else { /* satisfy from channel */
|
|
canreturn = available();
|
|
if (canreturn == 0) {
|
|
block ();
|
|
canreturn = available();
|
|
}
|
|
willreturn = canreturn>srclen ? srclen : canreturn;
|
|
inAppBB.get(b, off, willreturn);
|
|
available -= willreturn;
|
|
|
|
if (marked) { /* copy into markBuf */
|
|
try {
|
|
markBuf.put (b, off, willreturn);
|
|
} catch (BufferOverflowException e) {
|
|
marked = false;
|
|
}
|
|
}
|
|
}
|
|
return willreturn;
|
|
}
|
|
|
|
public synchronized int available () throws IOException {
|
|
if (closed)
|
|
throw new IOException ("Stream is closed");
|
|
|
|
if (reset)
|
|
return markBuf.remaining();
|
|
|
|
if (available > 0)
|
|
return available;
|
|
|
|
inAppBB.clear ();
|
|
int bytes = channel.read (inNetBB);
|
|
|
|
int needed = sslEng.getSession().getApplicationBufferSize();
|
|
if (needed > inAppBB.remaining()) {
|
|
inAppBB = ByteBuffer.allocate(needed);
|
|
}
|
|
inNetBB.flip();
|
|
SSLEngineResult result = sslEng.unwrap(inNetBB, inAppBB);
|
|
inNetBB.compact();
|
|
available = result.bytesProduced();
|
|
|
|
if (available > 0)
|
|
inAppBB.flip();
|
|
else if (available == -1)
|
|
throw new IOException ("Stream is closed");
|
|
return available;
|
|
}
|
|
|
|
/**
|
|
* block() only called when available==0 and buf is empty
|
|
*/
|
|
private synchronized void block () throws IOException {
|
|
//assert available == 0;
|
|
int n = selector.select ();
|
|
//assert n == 1;
|
|
selector.selectedKeys().clear();
|
|
available ();
|
|
}
|
|
|
|
public void close () throws IOException {
|
|
if (closed)
|
|
return;
|
|
channel.close ();
|
|
closed = true;
|
|
}
|
|
|
|
public synchronized void mark (int readlimit) {
|
|
if (closed)
|
|
return;
|
|
this.readlimit = readlimit;
|
|
markBuf = ByteBuffer.allocate (readlimit);
|
|
marked = true;
|
|
reset = false;
|
|
}
|
|
|
|
public synchronized void reset () throws IOException {
|
|
if (closed )
|
|
return;
|
|
if (!marked)
|
|
throw new IOException ("Stream not marked");
|
|
marked = false;
|
|
reset = true;
|
|
markBuf.flip ();
|
|
}
|
|
}
|
|
|
|
static class NioOutputStream extends OutputStream {
|
|
SSLEngine sslEng;
|
|
SocketChannel channel;
|
|
ByteBuffer outNetBB;
|
|
ByteBuffer outAppBB;
|
|
SelectionKey key;
|
|
Selector selector;
|
|
boolean closed;
|
|
byte[] one;
|
|
|
|
public NioOutputStream (SocketChannel channel, SSLEngine sslEng, ByteBuffer outNetBB, ByteBuffer outAppBB) throws IOException {
|
|
this.sslEng = sslEng;
|
|
this.channel = channel;
|
|
this.outNetBB = outNetBB;
|
|
this.outAppBB = outAppBB;
|
|
selector = Selector.open ();
|
|
key = channel.register (selector, SelectionKey.OP_WRITE);
|
|
closed = false;
|
|
one = new byte [1];
|
|
}
|
|
|
|
public synchronized void write (int b) throws IOException {
|
|
one[0] = (byte)b;
|
|
write (one, 0, 1);
|
|
}
|
|
|
|
public synchronized void write (byte[] b) throws IOException {
|
|
write (b, 0, b.length);
|
|
}
|
|
|
|
public synchronized void write (byte[] b, int off, int len) throws IOException {
|
|
if (closed)
|
|
throw new IOException ("stream is closed");
|
|
|
|
outAppBB = ByteBuffer.allocate (len);
|
|
outAppBB.put (b, off, len);
|
|
outAppBB.flip ();
|
|
int n;
|
|
outNetBB.clear();
|
|
int needed = sslEng.getSession().getPacketBufferSize();
|
|
if (outNetBB.capacity() < needed) {
|
|
outNetBB = ByteBuffer.allocate(needed);
|
|
}
|
|
SSLEngineResult ret = sslEng.wrap(outAppBB, outNetBB);
|
|
outNetBB.flip();
|
|
int newLen = ret.bytesProduced();
|
|
while ((n = channel.write (outNetBB)) < newLen) {
|
|
newLen -= n;
|
|
if (newLen == 0)
|
|
return;
|
|
selector.select ();
|
|
selector.selectedKeys().clear ();
|
|
}
|
|
}
|
|
|
|
public void close () throws IOException {
|
|
if (closed)
|
|
return;
|
|
channel.close ();
|
|
closed = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Utilities for synchronization. A condition is
|
|
* identified by a string name, and is initialized
|
|
* upon first use (ie. setCondition() or waitForCondition()). Threads
|
|
* are blocked until some thread calls (or has called) setCondition() for the same
|
|
* condition.
|
|
* <P>
|
|
* A rendezvous built on a condition is also provided for synchronizing
|
|
* N threads.
|
|
*/
|
|
|
|
private static HashMap conditions = new HashMap();
|
|
|
|
/*
|
|
* Modifiable boolean object
|
|
*/
|
|
private static class BValue {
|
|
boolean v;
|
|
}
|
|
|
|
/*
|
|
* Modifiable int object
|
|
*/
|
|
private static class IValue {
|
|
int v;
|
|
IValue (int i) {
|
|
v =i;
|
|
}
|
|
}
|
|
|
|
|
|
private static BValue getCond (String condition) {
|
|
synchronized (conditions) {
|
|
BValue cond = (BValue) conditions.get (condition);
|
|
if (cond == null) {
|
|
cond = new BValue();
|
|
conditions.put (condition, cond);
|
|
}
|
|
return cond;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set the condition to true. Any threads that are currently blocked
|
|
* waiting on the condition, will be unblocked and allowed to continue.
|
|
* Threads that subsequently call waitForCondition() will not block.
|
|
* If the named condition did not exist prior to the call, then it is created
|
|
* first.
|
|
*/
|
|
|
|
public static void setCondition (String condition) {
|
|
BValue cond = getCond (condition);
|
|
synchronized (cond) {
|
|
if (cond.v) {
|
|
return;
|
|
}
|
|
cond.v = true;
|
|
cond.notifyAll();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* If the named condition does not exist, then it is created and initialized
|
|
* to false. If the condition exists or has just been created and its value
|
|
* is false, then the thread blocks until another thread sets the condition.
|
|
* If the condition exists and is already set to true, then this call returns
|
|
* immediately without blocking.
|
|
*/
|
|
|
|
public static void waitForCondition (String condition) {
|
|
BValue cond = getCond (condition);
|
|
synchronized (cond) {
|
|
if (!cond.v) {
|
|
try {
|
|
cond.wait();
|
|
} catch (InterruptedException e) {}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* conditions must be locked when accessing this */
|
|
static HashMap rv = new HashMap();
|
|
|
|
/**
|
|
* Force N threads to rendezvous (ie. wait for each other) before proceeding.
|
|
* The first thread(s) to call are blocked until the last
|
|
* thread makes the call. Then all threads continue.
|
|
* <p>
|
|
* All threads that call with the same condition name, must use the same value
|
|
* for N (or the results may be not be as expected).
|
|
* <P>
|
|
* Obviously, if fewer than N threads make the rendezvous then the result
|
|
* will be a hang.
|
|
*/
|
|
|
|
public static void rendezvous (String condition, int N) {
|
|
BValue cond;
|
|
IValue iv;
|
|
String name = "RV_"+condition;
|
|
|
|
/* get the condition */
|
|
|
|
synchronized (conditions) {
|
|
cond = (BValue)conditions.get (name);
|
|
if (cond == null) {
|
|
/* we are first caller */
|
|
if (N < 2) {
|
|
throw new RuntimeException ("rendezvous must be called with N >= 2");
|
|
}
|
|
cond = new BValue ();
|
|
conditions.put (name, cond);
|
|
iv = new IValue (N-1);
|
|
rv.put (name, iv);
|
|
} else {
|
|
/* already initialised, just decrement the counter */
|
|
iv = (IValue) rv.get (name);
|
|
iv.v --;
|
|
}
|
|
}
|
|
|
|
if (iv.v > 0) {
|
|
waitForCondition (name);
|
|
} else {
|
|
setCondition (name);
|
|
synchronized (conditions) {
|
|
clearCondition (name);
|
|
rv.remove (name);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* If the named condition exists and is set then remove it, so it can
|
|
* be re-initialized and used again. If the condition does not exist, or
|
|
* exists but is not set, then the call returns without doing anything.
|
|
* Note, some higher level synchronization
|
|
* may be needed between clear and the other operations.
|
|
*/
|
|
|
|
public static void clearCondition(String condition) {
|
|
BValue cond;
|
|
synchronized (conditions) {
|
|
cond = (BValue) conditions.get (condition);
|
|
if (cond == null) {
|
|
return;
|
|
}
|
|
synchronized (cond) {
|
|
if (cond.v) {
|
|
conditions.remove (condition);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|