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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.coyote.http11;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import org.apache.coyote.OutputBuffer;
import org.apache.coyote.Response;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.http.HttpMessages;
import org.apache.tomcat.util.net.AbstractEndpoint;
import org.apache.tomcat.util.net.NioChannel;
import org.apache.tomcat.util.net.NioEndpoint;
import org.apache.tomcat.util.net.NioSelectorPool;
import org.apache.tomcat.util.net.SocketWrapper;
/**
* Output buffer.
*
* @author Remy Maucherat
* @author Filip Hanik
*/
public class InternalNioOutputBuffer extends AbstractOutputBuffer {
// ----------------------------------------------------------- Constructors
/**
* Default constructor.
*/
public InternalNioOutputBuffer(Response response, int headerBufferSize) {
this.response = response;
buf = new byte[headerBufferSize];
outputStreamOutputBuffer = new SocketOutputBuffer();
filterLibrary = new OutputFilter[0];
activeFilters = new OutputFilter[0];
lastActiveFilter = -1;
committed = false;
finished = false;
// Cause loading of HttpMessages
HttpMessages.getInstance(response.getLocale()).getMessage(200);
}
/**
* Underlying socket.
*/
private NioChannel socket;
/**
* Selector pool, for blocking reads and blocking writes
*/
private NioSelectorPool pool;
// --------------------------------------------------------- Public Methods
/**
* Flush the response.
*
* @throws IOException an underlying I/O error occurred
*
*/
@Override
public void flush() throws IOException {
super.flush();
// Flush the current buffer
flushBuffer();
}
/**
* Recycle the output buffer. This should be called when closing the
* connection.
*/
@Override
public void recycle() {
super.recycle();
if (socket != null) {
socket.getBufHandler().getWriteBuffer().clear();
socket = null;
}
}
/**
* End request.
*
* @throws IOException an underlying I/O error occurred
*/
@Override
public void endRequest() throws IOException {
super.endRequest();
flushBuffer();
}
// ------------------------------------------------ HTTP/1.1 Output Methods
/**
* Send an acknowledgment.
*/
@Override
public void sendAck() throws IOException {
if (!committed) {
//Socket.send(socket, Constants.ACK_BYTES, 0, Constants.ACK_BYTES.length) < 0
socket.getBufHandler() .getWriteBuffer().put(Constants.ACK_BYTES,0,Constants.ACK_BYTES.length);
writeToSocket(socket.getBufHandler() .getWriteBuffer(),true,true);
}
}
/**
*
* @param bytebuffer ByteBuffer
* @param flip boolean
* @return int
* @throws IOException
* TODO Fix non blocking write properly
*/
private synchronized int writeToSocket(ByteBuffer bytebuffer, boolean block, boolean flip) throws IOException {
if ( flip ) bytebuffer.flip();
int written = 0;
NioEndpoint.KeyAttachment att = (NioEndpoint.KeyAttachment)socket.getAttachment();
if ( att == null ) throw new IOException("Key must be cancelled");
long writeTimeout = att.getWriteTimeout();
Selector selector = null;
try {
selector = pool.get();
} catch ( IOException x ) {
//ignore
}
try {
written = pool.write(bytebuffer, socket, selector, writeTimeout, block);
//make sure we are flushed
do {
if (socket.flush(true,selector,writeTimeout)) break;
}while ( true );
}finally {
if ( selector != null ) pool.put(selector);
}
if ( block ) bytebuffer.clear(); //only clear
return written;
}
// ------------------------------------------------------ Protected Methods
@Override
public void init(SocketWrapper socketWrapper,
AbstractEndpoint endpoint) throws IOException {
socket = socketWrapper.getSocket();
pool = ((NioEndpoint)endpoint).getSelectorPool();
}
/**
* Commit the response.
*
* @throws IOException an underlying I/O error occurred
*/
@Override
protected void commit()
throws IOException {
// The response is now committed
committed = true;
response.setCommitted(true);
if (pos > 0) {
// Sending the response header buffer
addToBB(buf, 0, pos);
}
}
private synchronized void addToBB(byte[] buf, int offset, int length) throws IOException {
while (length > 0) {
int thisTime = length;
if (socket.getBufHandler().getWriteBuffer().position() ==
socket.getBufHandler().getWriteBuffer().capacity()
|| socket.getBufHandler().getWriteBuffer().remaining()==0) {
flushBuffer();
}
if (thisTime > socket.getBufHandler().getWriteBuffer().remaining()) {
thisTime = socket.getBufHandler().getWriteBuffer().remaining();
}
socket.getBufHandler().getWriteBuffer().put(buf, offset, thisTime);
length = length - thisTime;
offset = offset + thisTime;
}
NioEndpoint.KeyAttachment ka = (NioEndpoint.KeyAttachment)socket.getAttachment();
if ( ka!= null ) ka.access();//prevent timeouts for just doing client writes
}
/**
* Callback to write data from the buffer.
*/
private void flushBuffer() throws IOException {
//prevent timeout for async,
SelectionKey key = socket.getIOChannel().keyFor(socket.getPoller().getSelector());
if (key != null) {
NioEndpoint.KeyAttachment attach = (NioEndpoint.KeyAttachment) key.attachment();
attach.access();
}
//write to the socket, if there is anything to write
if (socket.getBufHandler().getWriteBuffer().position() > 0) {
socket.getBufHandler().getWriteBuffer().flip();
writeToSocket(socket.getBufHandler().getWriteBuffer(),true, false);
}
}
// ----------------------------------- OutputStreamOutputBuffer Inner Class
/**
* This class is an output buffer which will write data to an output
* stream.
*/
protected class SocketOutputBuffer
implements OutputBuffer {
/**
* Write chunk.
*/
@Override
public int doWrite(ByteChunk chunk, Response res)
throws IOException {
int len = chunk.getLength();
int start = chunk.getStart();
byte[] b = chunk.getBuffer();
addToBB(b, start, len);
byteCount += chunk.getLength();
return chunk.getLength();
}
@Override
public long getBytesWritten() {
return byteCount;
}
}
}
