author | prappo |
Mon, 18 Jul 2016 13:43:49 +0100 | |
changeset 39729 | ef2b0635618f |
parent 37874 | 02589df0999a |
child 39730 | 196f4e25d9f5 |
permissions | -rw-r--r-- |
37874 | 1 |
/* |
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* Copyright (c) 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 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 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 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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package java.net.http; |
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import java.io.IOException; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.SelectionKey; |
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import java.util.function.Consumer; |
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import static java.util.Objects.requireNonNull; |
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/* |
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* Writes ByteBuffer[] to the channel in a non-blocking, asynchronous fashion. |
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* |
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* A client attempts to write data by calling |
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* |
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* boolean tryWriteFully(ByteBuffer[] buffers) |
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* |
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* If the attempt was successful and all the data has been written, then the |
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* method returns `true`. |
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* |
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* If the data has been written partially, then the method returns `false`, and |
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* the writer (this object) attempts to complete the write asynchronously by |
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* calling, possibly more than once |
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* |
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* boolean tryCompleteWrite() |
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* |
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* in its own threads. |
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* |
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* When the write has been completed asynchronously, the callback is signalled |
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* with `null`. |
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* |
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* If an error occurs in any of these stages it will NOT be thrown from the |
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* method. Instead `false` will be returned and the exception will be signalled |
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* to the callback. This is done in order to handle all exceptions in a single |
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* place. |
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*/ |
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final class WSWriter { |
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private final RawChannel channel; |
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39729
ef2b0635618f
8161474: Extract interface from java.net.http.RawChannel
prappo
parents:
37874
diff
changeset
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private final RawChannel.RawEvent writeReadinessHandler; |
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private final Consumer<Throwable> completionCallback; |
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private ByteBuffer[] buffers; |
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private int offset; |
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WSWriter(RawChannel channel, Consumer<Throwable> completionCallback) { |
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this.channel = channel; |
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this.completionCallback = completionCallback; |
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this.writeReadinessHandler = createHandler(); |
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} |
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boolean tryWriteFully(ByteBuffer[] buffers) { |
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synchronized (this) { |
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this.buffers = requireNonNull(buffers); |
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this.offset = 0; |
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} |
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return tryCompleteWrite(); |
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} |
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private final boolean tryCompleteWrite() { |
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try { |
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return writeNow(); |
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} catch (IOException e) { |
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completionCallback.accept(e); |
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return false; |
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} |
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} |
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private boolean writeNow() throws IOException { |
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synchronized (this) { |
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for (; offset != -1; offset = nextUnwrittenIndex(buffers, offset)) { |
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long bytesWritten = channel.write(buffers, offset, buffers.length - offset); |
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if (bytesWritten == 0) { |
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channel.registerEvent(writeReadinessHandler); |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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private static int nextUnwrittenIndex(ByteBuffer[] buffers, int offset) { |
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for (int i = offset; i < buffers.length; i++) { |
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if (buffers[i].hasRemaining()) { |
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return i; |
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} |
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} |
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return -1; |
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} |
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39729
ef2b0635618f
8161474: Extract interface from java.net.http.RawChannel
prappo
parents:
37874
diff
changeset
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private RawChannel.RawEvent createHandler() { |
ef2b0635618f
8161474: Extract interface from java.net.http.RawChannel
prappo
parents:
37874
diff
changeset
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return new RawChannel.RawEvent() { |
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@Override |
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public int interestOps() { |
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return SelectionKey.OP_WRITE; |
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} |
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@Override |
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public void handle() { |
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if (tryCompleteWrite()) { |
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completionCallback.accept(null); |
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} |
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} |
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@Override |
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public String toString() { |
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return "Write readiness event [" + channel + "]"; |
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} |
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}; |
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} |
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} |