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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.
// Copyright (c) 2007-Present Pivotal Software, Inc. All rights reserved.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 1.1 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2. For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.impl.nio;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
/**
* Bridge between the byte buffer and stream worlds.
*/
public class ByteBufferInputStream extends InputStream {
private final ReadableByteChannel channel;
private final ByteBuffer buffer;
public ByteBufferInputStream(ReadableByteChannel channel, ByteBuffer buffer) {
this.channel = channel;
this.buffer = buffer;
}
@Override
public int read() throws IOException {
readFromNetworkIfNecessary(channel, buffer);
return readFromBuffer(buffer);
}
private int readFromBuffer(ByteBuffer buffer) {
return buffer.get() & 0xff;
}
private static void readFromNetworkIfNecessary(ReadableByteChannel channel, ByteBuffer buffer) throws IOException {
if(!buffer.hasRemaining()) {
buffer.clear();
int read = NioHelper.read(channel, buffer);
if(read <= 0) {
NioHelper.retryRead(channel, buffer);
}
buffer.flip();
}
}
}