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package com.sun.enterprise.web.connector.grizzly;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import org.apache.coyote.Response;
import org.apache.coyote.http11.InternalOutputBuffer;
/**
* Output buffer.
* Buffer the bytes until the <code>ByteChunk</code> is full or the request
* is completed.
*
* @author Jean-Francois Arcand
* @author Scott Oaks
*/
public class SocketChannelOutputBuffer extends InternalOutputBuffer{
/**
* Underlying output socketChannel.
*/
protected SocketChannel socketChannel;
/**
* Underlying ByteByteBuffer
*/
private ByteBuffer outputByteBuffer;
/**
* ACK static bytes.
*/
private final static ByteBuffer ACK =
ByteBuffer.wrap("HTTP/1.1 100 Continue\r\n\r\n".getBytes());
// ----------------------------------------------------------- Constructors
/**
* Alternate constructor.
*/
public SocketChannelOutputBuffer(Response response,
int headerBufferSize, boolean useSocketBuffer) {
super(response,headerBufferSize, useSocketBuffer);
if (!useSocketBuffer){
outputStream = new NIOOutputStream();
}
outputByteBuffer = ByteBuffer.allocate(headerBufferSize * 10);
}
// ------------------------------------------------------------- Properties
/**
* Set the underlying socket output stream.
*/
public void setChannel(SocketChannel socketChannel) {
this.socketChannel = socketChannel;
}
/**
* Return the underlying SocketChannel
*/
public SocketChannel getChannel(){
return socketChannel;
}
// --------------------------------------------------------- Public Methods
/**
* Send an acknoledgement without buffering.
*/
public void sendAck() throws IOException {
if (!committed)
flushChannel(ACK.slice());
}
/**
* Callback to write data from the buffer.
*/
public void realWriteBytes(byte cbuf[], int off, int len)
throws IOException {
if (len > 0) {
if (len > outputByteBuffer.remaining()){
int size = Math.max(outputByteBuffer.capacity() * 2,
len + outputByteBuffer.position());
ByteBuffer tmp = ByteBuffer.allocate(size);
outputByteBuffer.flip();
tmp.put(outputByteBuffer);
outputByteBuffer = tmp;
}
outputByteBuffer.put(cbuf, off, len);
}
}
/**
* Flush the buffer by looping until the <code>ByteBuffer</code> is empty
* @param bb the ByteBuffer to write.
*/
public void flushChannel(ByteBuffer bb) throws IOException{
OutputWriter.flushChannel(socketChannel, bb);
bb.clear();
}
/**
* Flush the buffered bytes,
*/
public void flush() throws IOException{
super.flush();
if (outputByteBuffer.position() != 0){
flushBuffer();
}
}
/**
* End request.
*
* @throws IOException an undelying I/O error occured
*/
public void endRequest()
throws IOException {
super.endRequest();
if (!useSocketBuffer && outputByteBuffer.position() != 0) {
flushBuffer();
}
}
/**
* Writes bytes to the underlying socketChannel.
*/
public void flushBuffer() throws IOException{
if (outputByteBuffer.position() != 0){
outputByteBuffer.flip();
flushChannel(outputByteBuffer);
outputByteBuffer.clear();
}
}
/**
* Recycle the output buffer. This should be called when closing the
* connection.
*/
public void recycle() {
response.recycle();
socketBuffer.recycle();
pos = 0;
lastActiveFilter = -1;
committed = false;
finished = false;
outputByteBuffer.clear();
socketChannel = null;
}
// ---------------------------------------------- Class helper ----------//
/**
* OutputBuffer delegating all writes to the <code>OutputWriter</code>
*/
private final class NIOOutputStream extends OutputStream{
public void write(byte[] b, int off, int len) throws IOException{
realWriteBytes(b,off,len);
}
public void write(int b) throws IOException {
write((byte)b);
}
public void write(byte b) throws IOException {
if(!outputByteBuffer.hasRemaining()) {
ByteBuffer tmp = ByteBuffer.allocate(
outputByteBuffer.capacity() * 2);
outputByteBuffer.flip();
tmp.put(outputByteBuffer);
outputByteBuffer = tmp;
}
outputByteBuffer.put(b);
return;
}
}
}
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