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ByteBufferMessageSink.java
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ByteBufferMessageSink.java
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//
// ========================================================================
// Copyright (c) 1995-2022 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.websocket.core.internal.messages;
import java.nio.ByteBuffer;
import org.eclipse.jetty.io.ByteBufferCallbackAccumulator;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.websocket.core.CoreSession;
import org.eclipse.jetty.websocket.core.Frame;
import org.eclipse.jetty.websocket.core.exception.MessageTooLargeException;
import org.eclipse.jetty.websocket.core.internal.util.MethodHolder;
public class ByteBufferMessageSink extends AbstractMessageSink
{
private ByteBufferCallbackAccumulator out;
public ByteBufferMessageSink(CoreSession session, MethodHolder methodHolder)
{
super(session, methodHolder);
}
@Override
public void accept(Frame frame, Callback callback)
{
try
{
long size = (out == null ? 0 : out.getLength()) + frame.getPayloadLength();
long maxBinaryMessageSize = session.getMaxBinaryMessageSize();
if (maxBinaryMessageSize > 0 && size > maxBinaryMessageSize)
{
throw new MessageTooLargeException(String.format("Binary message too large: (actual) %,d > (configured max binary message size) %,d",
size, maxBinaryMessageSize));
}
// If we are fin and no OutputStream has been created we don't need to aggregate.
if (frame.isFin() && (out == null))
{
if (frame.hasPayload())
methodHolder.invoke(frame.getPayload());
else
methodHolder.invoke(BufferUtil.EMPTY_BUFFER);
callback.succeeded();
session.demand(1);
return;
}
// Aggregate the frame payload.
if (frame.hasPayload())
{
ByteBuffer payload = frame.getPayload();
if (out == null)
out = new ByteBufferCallbackAccumulator();
out.addEntry(payload, callback);
}
// If the methodHandle throws we don't want to fail callback twice.
callback = Callback.NOOP;
if (frame.isFin())
{
ByteBufferPool bufferPool = session.getByteBufferPool();
ByteBuffer buffer = bufferPool.acquire(out.getLength(), false);
out.writeTo(buffer);
try
{
methodHolder.invoke(buffer);
}
finally
{
bufferPool.release(buffer);
}
}
session.demand(1);
}
catch (Throwable t)
{
if (out != null)
out.fail(t);
callback.failed(t);
}
finally
{
if (frame.isFin())
{
out = null;
}
}
}
}