| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.core5.http.nio.support.classic; |
| |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| import java.nio.ByteBuffer; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.nio.DataStreamChannel; |
| |
| /** |
| * @since 5.0 |
| */ |
| @Contract(threading = ThreadingBehavior.SAFE) |
| public final class SharedOutputBuffer extends AbstractSharedBuffer implements ContentOutputBuffer { |
| |
| private volatile DataStreamChannel dataStreamChannel; |
| private volatile boolean hasCapacity; |
| private volatile boolean endStreamPropagated; |
| |
| public SharedOutputBuffer(final ReentrantLock lock, final int initialBufferSize) { |
| super(lock, initialBufferSize); |
| this.hasCapacity = false; |
| this.endStreamPropagated = false; |
| } |
| |
| public SharedOutputBuffer(final int bufferSize) { |
| this(new ReentrantLock(), bufferSize); |
| } |
| |
| public void flush(final DataStreamChannel channel) throws IOException { |
| lock.lock(); |
| try { |
| dataStreamChannel = channel; |
| hasCapacity = true; |
| setOutputMode(); |
| if (buffer().hasRemaining()) { |
| dataStreamChannel.write(buffer()); |
| } |
| if (!buffer().hasRemaining() && endStream) { |
| propagateEndStream(); |
| } |
| condition.signalAll(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| private void ensureNotAborted() throws InterruptedIOException { |
| if (aborted) { |
| throw new InterruptedIOException("Operation aborted"); |
| } |
| } |
| |
| @Override |
| public void write(final byte[] b, final int off, final int len) throws IOException { |
| final ByteBuffer src = ByteBuffer.wrap(b, off, len); |
| lock.lock(); |
| try { |
| ensureNotAborted(); |
| setInputMode(); |
| while (src.hasRemaining()) { |
| // always buffer small chunks |
| if (src.remaining() < 1024 && buffer().remaining() > src.remaining()) { |
| buffer().put(src); |
| } else { |
| if (buffer().position() > 0 || dataStreamChannel == null) { |
| waitFlush(); |
| } |
| if (buffer().position() == 0 && dataStreamChannel != null) { |
| final int bytesWritten = dataStreamChannel.write(src); |
| if (bytesWritten == 0) { |
| hasCapacity = false; |
| waitFlush(); |
| } |
| } |
| } |
| } |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| public void write(final int b) throws IOException { |
| lock.lock(); |
| try { |
| ensureNotAborted(); |
| setInputMode(); |
| if (!buffer().hasRemaining()) { |
| waitFlush(); |
| } |
| buffer().put((byte)b); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| public void writeCompleted() throws IOException { |
| if (endStream) { |
| return; |
| } |
| lock.lock(); |
| try { |
| if (!endStream) { |
| endStream = true; |
| if (dataStreamChannel != null) { |
| setOutputMode(); |
| if (buffer().hasRemaining()) { |
| dataStreamChannel.requestOutput(); |
| } else { |
| propagateEndStream(); |
| } |
| } |
| } |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| private void waitFlush() throws InterruptedIOException { |
| setOutputMode(); |
| if (dataStreamChannel != null) { |
| dataStreamChannel.requestOutput(); |
| } |
| ensureNotAborted(); |
| while (buffer().hasRemaining() || !hasCapacity) { |
| try { |
| condition.await(); |
| } catch (final InterruptedException ex) { |
| Thread.currentThread().interrupt(); |
| throw new InterruptedIOException(ex.getMessage()); |
| } |
| ensureNotAborted(); |
| } |
| setInputMode(); |
| } |
| |
| private void propagateEndStream() throws IOException { |
| if (!endStreamPropagated) { |
| dataStreamChannel.endStream(); |
| endStreamPropagated = true; |
| } |
| } |
| |
| } |