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org.eclipse.jetty.io.ByteArrayEndPoint Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.io;
import java.io.EOFException;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.thread.AutoLock;
import org.eclipse.jetty.util.thread.Scheduler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ByteArrayEndPoint.
*/
public class ByteArrayEndPoint extends AbstractEndPoint
{
private static SocketAddress noSocketAddress()
{
try
{
return new InetSocketAddress(InetAddress.getByName("0.0.0.0"), 0);
}
catch (Throwable x)
{
throw new RuntimeIOException(x);
}
}
private static final Logger LOG = LoggerFactory.getLogger(ByteArrayEndPoint.class);
private static final SocketAddress NO_SOCKET_ADDRESS = noSocketAddress();
private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 1024;
private static final ByteBuffer EOF = BufferUtil.allocate(0);
private final Runnable _runFillable = () -> getFillInterest().fillable();
private final AutoLock _lock = new AutoLock();
private final Condition _hasOutput = _lock.newCondition();
private final Queue _inQ = new ArrayDeque<>();
private final int _outputSize;
private ByteBuffer _out;
private boolean _growOutput;
public ByteArrayEndPoint()
{
this(null, 0, null, null);
}
/**
* @param input the input bytes
* @param outputSize the output size
*/
public ByteArrayEndPoint(byte[] input, int outputSize)
{
this(null, 0, input != null ? BufferUtil.toBuffer(input) : null, BufferUtil.allocate(outputSize));
}
/**
* @param input the input string (converted to bytes using default encoding charset)
* @param outputSize the output size
*/
public ByteArrayEndPoint(String input, int outputSize)
{
this(null, 0, input != null ? BufferUtil.toBuffer(input) : null, BufferUtil.allocate(outputSize));
}
public ByteArrayEndPoint(Scheduler scheduler, long idleTimeoutMs)
{
this(scheduler, idleTimeoutMs, null, null);
}
public ByteArrayEndPoint(Scheduler timer, long idleTimeoutMs, byte[] input, int outputSize)
{
this(timer, idleTimeoutMs, input != null ? BufferUtil.toBuffer(input) : null, BufferUtil.allocate(outputSize));
}
public ByteArrayEndPoint(Scheduler timer, long idleTimeoutMs, String input, int outputSize)
{
this(timer, idleTimeoutMs, input != null ? BufferUtil.toBuffer(input) : null, BufferUtil.allocate(outputSize));
}
public ByteArrayEndPoint(Scheduler timer, long idleTimeoutMs, ByteBuffer input, ByteBuffer output)
{
super(timer);
if (BufferUtil.hasContent(input))
addInput(input);
_outputSize = (output == null) ? 1024 : output.capacity();
_out = output == null ? BufferUtil.allocate(_outputSize) : output;
setIdleTimeout(idleTimeoutMs);
onOpen();
}
@Override
public SocketAddress getLocalSocketAddress()
{
return NO_SOCKET_ADDRESS;
}
@Override
public SocketAddress getRemoteSocketAddress()
{
return NO_SOCKET_ADDRESS;
}
@Override
public void doShutdownOutput()
{
super.doShutdownOutput();
try (AutoLock l = _lock.lock())
{
_hasOutput.signalAll();
}
}
@Override
public void doClose()
{
super.doClose();
try (AutoLock l = _lock.lock())
{
_hasOutput.signalAll();
}
}
@Override
protected void onIncompleteFlush()
{
// Don't need to do anything here as takeOutput does the signalling.
}
protected void execute(Runnable task)
{
new Thread(task, "BAEPoint-" + Integer.toHexString(hashCode())).start();
}
@Override
protected void needsFillInterest() throws IOException
{
try (AutoLock lock = _lock.lock())
{
if (!isOpen())
throw new ClosedChannelException();
ByteBuffer in = _inQ.peek();
if (LOG.isDebugEnabled())
LOG.debug("{} needsFillInterest EOF={} {}", this, in == EOF, BufferUtil.toDetailString(in));
if (BufferUtil.hasContent(in) || isEOF(in))
execute(_runFillable);
}
}
/**
*
*/
public void addInputEOF()
{
addInput((ByteBuffer)null);
}
/**
* @param in The in to set.
*/
public void addInput(ByteBuffer in)
{
boolean fillable = false;
try (AutoLock lock = _lock.lock())
{
if (isEOF(_inQ.peek()))
throw new RuntimeIOException(new EOFException());
boolean wasEmpty = _inQ.isEmpty();
if (in == null)
{
if (LOG.isDebugEnabled())
LOG.debug("{} addEOFAndRun=true", this);
_inQ.add(EOF);
fillable = true;
}
if (BufferUtil.hasContent(in))
{
if (LOG.isDebugEnabled())
LOG.debug("{} addInputAndRun={} {}", this, wasEmpty, BufferUtil.toDetailString(in));
_inQ.add(in);
fillable = wasEmpty;
}
}
if (fillable)
_runFillable.run();
}
public void addInput(String s)
{
addInput(BufferUtil.toBuffer(s, StandardCharsets.UTF_8));
}
public void addInput(String s, Charset charset)
{
addInput(BufferUtil.toBuffer(s, charset));
}
public void addInputAndExecute(String s)
{
addInputAndExecute(BufferUtil.toBuffer(s, StandardCharsets.UTF_8));
}
public void addInputAndExecute(ByteBuffer in)
{
boolean fillable = false;
try (AutoLock lock = _lock.lock())
{
if (isEOF(_inQ.peek()))
throw new RuntimeIOException(new EOFException());
boolean wasEmpty = _inQ.isEmpty();
if (in == null)
{
if (LOG.isDebugEnabled())
LOG.debug("{} addEOFAndExecute=true", this);
_inQ.add(EOF);
fillable = true;
}
if (BufferUtil.hasContent(in))
{
if (LOG.isDebugEnabled())
LOG.debug("{} addInputAndExecute={} {}", this, wasEmpty, BufferUtil.toDetailString(in));
_inQ.add(in);
fillable = wasEmpty;
}
}
if (fillable)
execute(_runFillable);
}
/**
* @return Returns the out.
*/
public ByteBuffer getOutput()
{
try (AutoLock lock = _lock.lock())
{
return _out;
}
}
/**
* @return Returns the out.
*/
public String getOutputString()
{
return getOutputString(StandardCharsets.UTF_8);
}
/**
* @param charset the charset to encode the output as
* @return Returns the out.
*/
public String getOutputString(Charset charset)
{
return BufferUtil.toString(_out, charset);
}
/**
* @return Returns the out.
*/
public ByteBuffer takeOutput()
{
ByteBuffer b;
try (AutoLock lock = _lock.lock())
{
b = _out;
_out = BufferUtil.allocate(_outputSize);
}
getWriteFlusher().completeWrite();
return b;
}
/**
* Wait for some output
*
* @param time Time to wait
* @param unit Units for time to wait
* @return The buffer of output
* @throws InterruptedException if interrupted
*/
public ByteBuffer waitForOutput(long time, TimeUnit unit) throws InterruptedException
{
ByteBuffer b;
try (AutoLock l = _lock.lock())
{
while (BufferUtil.isEmpty(_out) && !isOutputShutdown())
{
if (!_hasOutput.await(time, unit))
return null;
}
b = _out;
_out = BufferUtil.allocate(_outputSize);
}
getWriteFlusher().completeWrite();
return b;
}
/**
* @return Returns the out.
*/
public String takeOutputString()
{
return takeOutputString(StandardCharsets.UTF_8);
}
/**
* @param charset the charset to encode the output as
* @return Returns the out.
*/
public String takeOutputString(Charset charset)
{
ByteBuffer buffer = takeOutput();
return BufferUtil.toString(buffer, charset);
}
/**
* @param out The out to set.
*/
public void setOutput(ByteBuffer out)
{
try (AutoLock lock = _lock.lock())
{
_out = out;
}
getWriteFlusher().completeWrite();
}
/**
* @return {@code true} if there are bytes remaining to be read from the encoded input
*/
public boolean hasMore()
{
return getOutput().position() > 0;
}
@Override
public int fill(ByteBuffer buffer) throws IOException
{
int filled = 0;
try (AutoLock lock = _lock.lock())
{
while (true)
{
if (!isOpen())
throw new EofException("CLOSED");
if (isInputShutdown())
return -1;
if (_inQ.isEmpty())
break;
ByteBuffer in = _inQ.peek();
if (isEOF(in))
{
filled = -1;
break;
}
if (BufferUtil.hasContent(in))
{
filled = BufferUtil.append(buffer, in);
if (BufferUtil.isEmpty(in))
_inQ.poll();
break;
}
_inQ.poll();
}
}
if (filled > 0)
notIdle();
else if (filled < 0)
shutdownInput();
return filled;
}
@Override
public boolean flush(ByteBuffer... buffers) throws IOException
{
boolean flushed = true;
try (AutoLock l = _lock.lock())
{
if (!isOpen())
throw new IOException("CLOSED");
if (isOutputShutdown())
throw new IOException("OSHUT");
boolean idle = true;
for (ByteBuffer b : buffers)
{
if (BufferUtil.hasContent(b))
{
if (_growOutput && b.remaining() > BufferUtil.space(_out))
{
BufferUtil.compact(_out);
if (b.remaining() > BufferUtil.space(_out))
{
// Don't grow larger than MAX_BUFFER_SIZE to avoid memory issues.
if (_out.capacity() < MAX_BUFFER_SIZE)
{
long newBufferCapacity = Math.min((long)(_out.capacity() + b.remaining() * 1.5), MAX_BUFFER_SIZE);
ByteBuffer n = BufferUtil.allocate(Math.toIntExact(newBufferCapacity));
BufferUtil.append(n, _out);
_out = n;
}
}
}
if (BufferUtil.append(_out, b) > 0)
idle = false;
if (BufferUtil.hasContent(b))
{
flushed = false;
break;
}
}
}
if (!idle)
{
notIdle();
_hasOutput.signalAll();
}
}
return flushed;
}
@Override
public void reset()
{
try (AutoLock l = _lock.lock())
{
_inQ.clear();
_hasOutput.signalAll();
BufferUtil.clear(_out);
}
super.reset();
}
@Override
public Object getTransport()
{
return null;
}
/**
* @return the growOutput
*/
public boolean isGrowOutput()
{
return _growOutput;
}
/**
* Set the growOutput to set.
* @param growOutput the growOutput to set
*/
public void setGrowOutput(boolean growOutput)
{
_growOutput = growOutput;
}
@Override
public String toString()
{
int q;
Object b;
String o;
try (AutoLock lock = _lock.tryLock())
{
boolean held = lock.isHeldByCurrentThread();
q = held ? _inQ.size() : -1;
b = held ? _inQ.peek() : "?";
o = held ? BufferUtil.toDetailString(_out) : "?";
}
return String.format("%s[q=%d,q[0]=%s,o=%s]", super.toString(), q, b, o);
}
/**
* Compares a ByteBuffer Object to EOF by Reference
*
* @param buffer the input ByteBuffer to be compared to EOF
* @return Whether the reference buffer is equal to that of EOF
*/
private static boolean isEOF(ByteBuffer buffer)
{
@SuppressWarnings("ReferenceEquality")
boolean isEof = (buffer == EOF);
return isEof;
}
}
