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/*
* Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.internal.util.collection;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import org.glassfish.jersey.internal.LocalizationMessages;
/**
* An {@link java.io.InputStream} backed by a queue of {@link java.nio.ByteBuffer byte buffers}
* to be read.
*
* This input stream serves as a bridging inbound I/O component between a blocking upper I/O layer
* and an underlying non-blocking I/O layer. In addition to the blocking {@code InputStream.read} operations,
* this input stream provides the non-blocking {@code tryRead} counterparts.
*
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public final class ByteBufferInputStream extends NonBlockingInputStream {
/**
* Constant buffer indicating EOF.
*/
private static final ByteBuffer EOF = ByteBuffer.wrap(new byte[] {});
/**
* Read-side EOF flag. Does not have to be volatile, it is transient and only accessed from the reader thread.
*/
private boolean eof = false;
/**
* Currently read byte buffer.
*/
private ByteBuffer current;
/**
* Queue of byte buffers to be read.
*/
private final BlockingQueue buffers;
/**
* Content represents the buffer queue status.
*
* null = open, POISON_PILL = closed, Throwable = closed with error
*/
private final AtomicReference