com.tangosol.coherence.http.netty.NettyInputStream Maven / Gradle / Ivy
package com.tangosol.coherence.http.netty;
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*
* Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
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* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.LinkedBlockingDeque;
/**
* Input stream which serves as Request entity input.
*
* Converts Netty NIO buffers to an input streams and stores them in a queue,
* waiting for Jersey to process it.
*
*
* NOTE: This class is copied from Jersey and will be removed as soon
* as it is possible to migrate to Jersey 2.24 or later.
*
*
* @author Pavel Bucek (pavel.bucek at oracle.com)
*/
public class NettyInputStream
extends InputStream
{
// ---- constructors ----------------------------------------------------
/**
* Constructs a new {@link NettyInputStream} instance.
*
* @param isList the queue for pending reads
*/
public NettyInputStream(LinkedBlockingDeque isList)
{
this.isList = isList;
}
private interface ISReader
{
int readFrom(InputStream take) throws IOException;
}
private int readInternal(ISReader isReader) throws IOException
{
if (m_fEnd)
{
return -1;
}
InputStream take;
try
{
take = isList.take();
if (checkEndOfInput(take))
{
return -1;
}
int read = isReader.readFrom(take);
if (take.available() > 0)
{
isList.addFirst(take);
}
else
{
take.close();
}
return read;
}
catch (InterruptedException e)
{
throw new IOException("Interrupted.", e);
}
}
// ---- methods from InputStream ----------------------------------------
/**
* {@inheritDoc}
*/
@Override
public int read(byte[] abDest, int cbOff, int cbLen) throws IOException
{
return readInternal(take -> take.read(abDest, cbOff, cbLen));
}
/**
* {@inheritDoc}
*/
@Override
public int read() throws IOException
{
return readInternal(InputStream::read);
}
/**
* {@inheritDoc}
*/
@Override
public int available() throws IOException
{
InputStream peek = isList.peek();
if (peek != null)
{
return peek.available();
}
return 0;
}
/**
* {@inheritDoc}
*/
@Override
public void close() throws IOException
{
isList.forEach(is ->
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
});
}
// ---- helper methods --------------------------------------------------
/**
* Check if the specified {@link InputStream} represents the EOS.
*
* @param inToCheck the {@link InputStream} to check
*
* @return true if there is no more input, otherwise false
*
* @throws IOException if an error occurred at some point of the input
* queuing process
*/
private boolean checkEndOfInput(InputStream inToCheck) throws IOException
{
if (inToCheck == END_OF_INPUT)
{
m_fEnd = true;
return true;
}
else if (inToCheck == END_OF_INPUT_ERROR)
{
m_fEnd = true;
throw new IOException("Connection was closed prematurely.");
}
return false;
}
// ---- data members ----------------------------------------------------
/**
* Flag indicating EOS status.
*/
private volatile boolean m_fEnd = false;
/**
* End of input.
*/
public static final InputStream END_OF_INPUT = new InputStream()
{
@Override
public int read() throws IOException
{
return 0;
}
@Override
public String toString()
{
return "END_OF_INPUT " + super.toString();
}
};
/**
* Unexpected m_fEnd of input.
*/
public static final InputStream END_OF_INPUT_ERROR = new InputStream()
{
@Override
public int read() throws IOException
{
return 0;
}
@Override
public String toString()
{
return "END_OF_INPUT_ERROR " + super.toString();
}
};
private final LinkedBlockingDeque isList;
}