author | michaelm |
Sat, 30 Apr 2016 00:30:31 +0100 | |
changeset 37720 | 45cd7cc65382 |
parent 36434 | 3fd8dee1b158 |
child 37799 | 635c430d5a99 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2016, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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*/ |
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package java.net.http; |
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import javax.net.ssl.SSLContext; |
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import javax.net.ssl.SSLParameters; |
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import java.io.IOException; |
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import java.net.Authenticator; |
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import java.net.CookieManager; |
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import java.net.ProxySelector; |
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import java.net.URI; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.ClosedChannelException; |
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import java.nio.channels.SelectableChannel; |
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import java.nio.channels.SelectionKey; |
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import java.nio.channels.Selector; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.ListIterator; |
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import java.util.Optional; |
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import java.util.Set; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.ThreadFactory; |
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import java.util.stream.Stream; |
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import static java.net.http.Utils.BUFSIZE; |
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/** |
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* Client implementation. Contains all configuration information and also |
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* the selector manager thread which allows async events to be registered |
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* and delivered when they occur. See AsyncEvent. |
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*/ |
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class HttpClientImpl extends HttpClient implements BufferHandler { |
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private static final ThreadFactory defaultFactory = |
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(r -> new Thread(null, r, "HttpClient_worker", 0, true)); |
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private final CookieManager cookieManager; |
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private final Redirect followRedirects; |
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private final ProxySelector proxySelector; |
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private final Authenticator authenticator; |
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private final Version version; |
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private boolean pipelining = false; |
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private final ConnectionPool connections; |
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private final ExecutorWrapper executor; |
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// Security parameters |
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private final SSLContext sslContext; |
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private final SSLParameters sslParams; |
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private final SelectorManager selmgr; |
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private final FilterFactory filters; |
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private final Http2ClientImpl client2; |
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private final LinkedList<TimeoutEvent> timeouts; |
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public static HttpClientImpl create(HttpClientBuilderImpl builder) { |
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HttpClientImpl impl = new HttpClientImpl(builder); |
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impl.start(); |
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return impl; |
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} |
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private HttpClientImpl(HttpClientBuilderImpl builder) { |
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if (builder.sslContext == null) { |
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try { |
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sslContext = SSLContext.getDefault(); |
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} catch (NoSuchAlgorithmException ex) { |
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throw new InternalError(ex); |
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} |
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} else { |
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sslContext = builder.sslContext; |
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} |
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ExecutorService ex = builder.executor; |
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if (ex == null) { |
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ex = Executors.newCachedThreadPool((r) -> { |
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Thread t = defaultFactory.newThread(r); |
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t.setDaemon(true); |
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return t; |
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}); |
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} else { |
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ex = builder.executor; |
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} |
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client2 = new Http2ClientImpl(this); |
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executor = ExecutorWrapper.wrap(ex); |
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cookieManager = builder.cookieManager; |
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followRedirects = builder.followRedirects == null ? |
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Redirect.NEVER : builder.followRedirects; |
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this.proxySelector = builder.proxy; |
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authenticator = builder.authenticator; |
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version = builder.version; |
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sslParams = builder.sslParams; |
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connections = new ConnectionPool(); |
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connections.start(); |
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timeouts = new LinkedList<>(); |
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try { |
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selmgr = new SelectorManager(); |
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} catch (IOException e) { |
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// unlikely |
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throw new InternalError(e); |
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} |
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selmgr.setDaemon(true); |
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filters = new FilterFactory(); |
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initFilters(); |
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} |
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private void start() { |
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selmgr.start(); |
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} |
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/** |
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* Wait for activity on given exchange (assuming blocking = false). |
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* It's a no-op if blocking = true. In particular, the following occurs |
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* in the SelectorManager thread. |
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* |
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* 1) mark the connection non-blocking |
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* 2) add to selector |
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* 3) If selector fires for this exchange then |
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* 4) - mark connection as blocking |
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* 5) - call AsyncEvent.handle() |
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* |
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* If exchange needs to block again, then call registerEvent() again |
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*/ |
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void registerEvent(AsyncEvent exchange) throws IOException { |
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selmgr.register(exchange); |
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} |
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Http2ClientImpl client2() { |
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return client2; |
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} |
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/** |
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* We keep one size of buffer on free list. That size may increase |
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* depending on demand. If that happens we dispose of free buffers |
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* that are smaller than new size. |
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*/ |
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private final LinkedList<ByteBuffer> freelist = new LinkedList<>(); |
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int currentSize = BUFSIZE; |
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@Override |
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public synchronized ByteBuffer getBuffer(int size) { |
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ByteBuffer buf; |
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if (size == -1) |
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size = currentSize; |
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if (size > currentSize) |
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currentSize = size; |
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while (!freelist.isEmpty()) { |
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buf = freelist.removeFirst(); |
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if (buf.capacity() < currentSize) |
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continue; |
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buf.clear(); |
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return buf; |
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} |
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return ByteBuffer.allocate(size); |
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} |
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@Override |
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public synchronized void returnBuffer(ByteBuffer buffer) { |
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freelist.add(buffer); |
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} |
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@Override |
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public synchronized void setMinBufferSize(int n) { |
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currentSize = Math.max(n, currentSize); |
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} |
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// Main loop for this client's selector |
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private final class SelectorManager extends Thread { |
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private final Selector selector; |
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private volatile boolean closed; |
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private final List<AsyncEvent> readyList; |
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private final List<AsyncEvent> registrations; |
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SelectorManager() throws IOException { |
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super(null, null, "SelectorManager", 0, false); |
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readyList = new ArrayList<>(); |
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registrations = new ArrayList<>(); |
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selector = Selector.open(); |
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} |
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// This returns immediately. So caller not allowed to send/receive |
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// on connection. |
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synchronized void register(AsyncEvent e) throws IOException { |
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registrations.add(e); |
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selector.wakeup(); |
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} |
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void wakeupSelector() { |
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selector.wakeup(); |
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} |
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synchronized void shutdown() { |
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closed = true; |
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try { |
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selector.close(); |
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} catch (IOException ignored) { } |
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} |
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@Override |
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public void run() { |
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try { |
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while (!Thread.currentThread().isInterrupted()) { |
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synchronized (this) { |
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for (AsyncEvent exchange : registrations) { |
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SelectableChannel c = exchange.channel(); |
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try { |
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c.configureBlocking(false); |
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SelectionKey key = c.keyFor(selector); |
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SelectorAttachment sa; |
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if (key == null) { |
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sa = new SelectorAttachment(c, selector); |
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} else { |
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sa = (SelectorAttachment) key.attachment(); |
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} |
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sa.register(exchange); |
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} catch (IOException e) { |
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Log.logError("HttpClientImpl: " + e); |
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c.close(); |
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// let the exchange deal with it |
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handleEvent(exchange); |
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} |
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} |
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registrations.clear(); |
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} |
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long timeval = getTimeoutValue(); |
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long now = System.currentTimeMillis(); |
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//debugPrint(selector); |
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int n = selector.select(timeval); |
255 |
if (n == 0) { |
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signalTimeouts(now); |
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continue; |
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} |
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Set<SelectionKey> keys = selector.selectedKeys(); |
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for (SelectionKey key : keys) { |
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SelectorAttachment sa = (SelectorAttachment) key.attachment(); |
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int eventsOccurred = key.readyOps(); |
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sa.events(eventsOccurred).forEach(readyList::add); |
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sa.resetInterestOps(eventsOccurred); |
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} |
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selector.selectNow(); // complete cancellation |
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selector.selectedKeys().clear(); |
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for (AsyncEvent exchange : readyList) { |
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if (exchange.blocking()) { |
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exchange.channel().configureBlocking(true); |
273 |
} |
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executor.synchronize(); |
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handleEvent(exchange); // will be delegated to executor |
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276 |
} |
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readyList.clear(); |
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} |
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} catch (Throwable e) { |
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if (!closed) { |
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// This terminates thread. So, better just print stack trace |
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282 |
String err = Utils.stackTrace(e); |
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283 |
Log.logError("HttpClientImpl: fatal error: " + err); |
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} |
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} finally { |
286 |
shutdown(); |
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36131 | 287 |
} |
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} |
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289 |
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void debugPrint(Selector selector) { |
291 |
System.err.println("Selector: debugprint start"); |
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Set<SelectionKey> keys = selector.keys(); |
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for (SelectionKey key : keys) { |
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SelectableChannel c = key.channel(); |
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int ops = key.interestOps(); |
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296 |
System.err.printf("selector chan:%s ops:%d\n", c, ops); |
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297 |
} |
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298 |
System.err.println("Selector: debugprint end"); |
|
299 |
} |
|
300 |
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void handleEvent(AsyncEvent e) { |
302 |
if (closed) { |
|
303 |
e.abort(); |
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304 |
} else { |
|
305 |
e.handle(); |
|
306 |
} |
|
307 |
} |
|
308 |
} |
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309 |
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310 |
/** |
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* Tracks multiple user level registrations associated with one NIO |
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* registration (SelectionKey). In this implementation, registrations |
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* are one-off and when an event is posted the registration is cancelled |
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* until explicitly registered again. |
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* |
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* <p> No external synchronization required as this class is only used |
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* by the SelectorManager thread. One of these objects required per |
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* connection. |
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*/ |
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private static class SelectorAttachment { |
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private final SelectableChannel chan; |
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private final Selector selector; |
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private final ArrayList<AsyncEvent> pending; |
37720 | 324 |
private int interestOps; |
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SelectorAttachment(SelectableChannel chan, Selector selector) { |
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this.pending = new ArrayList<>(); |
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this.chan = chan; |
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this.selector = selector; |
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} |
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332 |
void register(AsyncEvent e) throws ClosedChannelException { |
37720 | 333 |
int newOps = e.interestOps(); |
334 |
boolean reRegister = (interestOps & newOps) != newOps; |
|
335 |
interestOps |= newOps; |
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pending.add(e); |
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if (reRegister) { |
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// first time registration happens here also |
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chan.register(selector, interestOps, this); |
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} |
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} |
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|
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/** |
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* Returns a Stream<AsyncEvents> containing only events that are |
37720 | 345 |
* registered with the given {@code interestOps}. |
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*/ |
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Stream<AsyncEvent> events(int interestOps) { |
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return pending.stream() |
37720 | 349 |
.filter(ev -> (ev.interestOps() & interestOps) != 0); |
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} |
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/** |
37720 | 353 |
* Removes any events with the given {@code interestOps}, and if no |
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354 |
* events remaining, cancels the associated SelectionKey. |
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355 |
*/ |
37720 | 356 |
void resetInterestOps(int interestOps) { |
357 |
int newOps = 0; |
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Iterator<AsyncEvent> itr = pending.iterator(); |
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while (itr.hasNext()) { |
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AsyncEvent event = itr.next(); |
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362 |
int evops = event.interestOps(); |
37720 | 363 |
if (event.repeating()) { |
364 |
newOps |= evops; |
|
365 |
continue; |
|
366 |
} |
|
367 |
if ((evops & interestOps) != 0) { |
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itr.remove(); |
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369 |
} else { |
37720 | 370 |
newOps |= evops; |
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371 |
} |
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372 |
} |
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373 |
|
37720 | 374 |
this.interestOps = newOps; |
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375 |
SelectionKey key = chan.keyFor(selector); |
37720 | 376 |
if (newOps == 0) { |
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key.cancel(); |
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378 |
} else { |
37720 | 379 |
key.interestOps(newOps); |
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380 |
} |
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381 |
} |
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382 |
} |
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383 |
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384 |
/** |
36131 | 385 |
* Creates a HttpRequest associated with this group. |
386 |
* |
|
37720 | 387 |
* @throws IllegalStateException |
388 |
* if the group has been stopped |
|
36131 | 389 |
*/ |
390 |
@Override |
|
391 |
public HttpRequestBuilderImpl request() { |
|
392 |
return new HttpRequestBuilderImpl(this, null); |
|
393 |
} |
|
394 |
||
395 |
/** |
|
396 |
* Creates a HttpRequest associated with this group. |
|
397 |
* |
|
37720 | 398 |
* @throws IllegalStateException |
399 |
* if the group has been stopped |
|
36131 | 400 |
*/ |
401 |
@Override |
|
402 |
public HttpRequestBuilderImpl request(URI uri) { |
|
403 |
return new HttpRequestBuilderImpl(this, uri); |
|
404 |
} |
|
405 |
||
406 |
@Override |
|
407 |
public SSLContext sslContext() { |
|
408 |
Utils.checkNetPermission("getSSLContext"); |
|
409 |
return sslContext; |
|
410 |
} |
|
411 |
||
412 |
@Override |
|
413 |
public Optional<SSLParameters> sslParameters() { |
|
414 |
return Optional.ofNullable(sslParams); |
|
415 |
} |
|
416 |
||
417 |
@Override |
|
418 |
public Optional<Authenticator> authenticator() { |
|
419 |
return Optional.ofNullable(authenticator); |
|
420 |
} |
|
421 |
||
422 |
@Override |
|
423 |
public ExecutorService executorService() { |
|
424 |
return executor.userExecutor(); |
|
425 |
} |
|
426 |
||
427 |
ExecutorWrapper executorWrapper() { |
|
428 |
return executor; |
|
429 |
} |
|
430 |
||
431 |
@Override |
|
432 |
public boolean pipelining() { |
|
433 |
return this.pipelining; |
|
434 |
} |
|
435 |
||
436 |
ConnectionPool connectionPool() { |
|
437 |
return connections; |
|
438 |
} |
|
439 |
||
440 |
@Override |
|
441 |
public Redirect followRedirects() { |
|
442 |
return followRedirects; |
|
443 |
} |
|
444 |
||
445 |
||
446 |
@Override |
|
447 |
public Optional<CookieManager> cookieManager() { |
|
448 |
return Optional.ofNullable(cookieManager); |
|
449 |
} |
|
450 |
||
451 |
@Override |
|
452 |
public Optional<ProxySelector> proxy() { |
|
453 |
return Optional.ofNullable(this.proxySelector); |
|
454 |
} |
|
455 |
||
456 |
@Override |
|
457 |
public Version version() { |
|
458 |
return version; |
|
459 |
} |
|
460 |
||
461 |
//private final HashMap<String, Boolean> http2NotSupported = new HashMap<>(); |
|
462 |
||
463 |
boolean getHttp2Allowed() { |
|
464 |
return version.equals(Version.HTTP_2); |
|
465 |
} |
|
466 |
||
37720 | 467 |
private void initFilters() { |
36131 | 468 |
addFilter(AuthenticationFilter.class); |
469 |
addFilter(RedirectFilter.class); |
|
470 |
} |
|
471 |
||
37720 | 472 |
private void addFilter(Class<? extends HeaderFilter> f) { |
36131 | 473 |
filters.addFilter(f); |
474 |
} |
|
475 |
||
476 |
final List<HeaderFilter> filterChain() { |
|
477 |
return filters.getFilterChain(); |
|
478 |
} |
|
479 |
||
480 |
// Timer controls. Timers are implemented through timed Selector.select() |
|
481 |
// calls. |
|
482 |
synchronized void registerTimer(TimeoutEvent event) { |
|
483 |
long elapse = event.timevalMillis(); |
|
484 |
ListIterator<TimeoutEvent> iter = timeouts.listIterator(); |
|
485 |
long listval = 0; |
|
486 |
event.delta = event.timeval; // in case list empty |
|
487 |
TimeoutEvent next; |
|
488 |
while (iter.hasNext()) { |
|
489 |
next = iter.next(); |
|
490 |
listval += next.delta; |
|
491 |
if (elapse < listval) { |
|
492 |
listval -= next.delta; |
|
493 |
event.delta = elapse - listval; |
|
494 |
next.delta -= event.delta; |
|
495 |
iter.previous(); |
|
496 |
break; |
|
497 |
} else if (!iter.hasNext()) { |
|
37720 | 498 |
event.delta = event.timeval - listval; |
36131 | 499 |
} |
500 |
} |
|
501 |
iter.add(event); |
|
502 |
selmgr.wakeupSelector(); |
|
503 |
} |
|
504 |
||
37720 | 505 |
private synchronized void signalTimeouts(long then) { |
36131 | 506 |
if (timeouts.isEmpty()) { |
507 |
return; |
|
508 |
} |
|
509 |
long now = System.currentTimeMillis(); |
|
510 |
long duration = now - then; |
|
511 |
ListIterator<TimeoutEvent> iter = timeouts.listIterator(); |
|
512 |
TimeoutEvent event = iter.next(); |
|
513 |
long delta = event.delta; |
|
514 |
if (duration < delta) { |
|
515 |
event.delta -= duration; |
|
516 |
return; |
|
517 |
} |
|
518 |
event.handle(); |
|
519 |
iter.remove(); |
|
520 |
while (iter.hasNext()) { |
|
521 |
event = iter.next(); |
|
522 |
if (event.delta == 0) { |
|
523 |
event.handle(); |
|
524 |
iter.remove(); |
|
525 |
} else { |
|
526 |
event.delta += delta; |
|
527 |
break; |
|
528 |
} |
|
529 |
} |
|
530 |
} |
|
531 |
||
532 |
synchronized void cancelTimer(TimeoutEvent event) { |
|
533 |
ListIterator<TimeoutEvent> iter = timeouts.listIterator(); |
|
534 |
while (iter.hasNext()) { |
|
535 |
TimeoutEvent ev = iter.next(); |
|
536 |
if (event == ev) { |
|
537 |
if (iter.hasNext()) { |
|
538 |
// adjust |
|
539 |
TimeoutEvent next = iter.next(); |
|
540 |
next.delta += ev.delta; |
|
541 |
iter.previous(); |
|
542 |
} |
|
543 |
iter.remove(); |
|
544 |
} |
|
545 |
} |
|
546 |
} |
|
547 |
||
548 |
// used for the connection window |
|
549 |
int getReceiveBufferSize() { |
|
550 |
return Utils.getIntegerNetProperty( |
|
37720 | 551 |
"java.net.httpclient.connectionWindowSize", 256 * 1024 |
36131 | 552 |
); |
553 |
} |
|
554 |
||
555 |
// returns 0 meaning block forever, or a number of millis to block for |
|
37720 | 556 |
private synchronized long getTimeoutValue() { |
36131 | 557 |
if (timeouts.isEmpty()) { |
558 |
return 0; |
|
559 |
} else { |
|
560 |
return timeouts.get(0).delta; |
|
561 |
} |
|
562 |
} |
|
563 |
} |