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*
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package com.sun.enterprise.web.connector.grizzly.algorithms;
import com.sun.enterprise.web.connector.grizzly.Constants;
import com.sun.enterprise.web.connector.grizzly.Handler;
import com.sun.enterprise.web.connector.grizzly.SelectorThread;
import com.sun.enterprise.web.connector.grizzly.StreamAlgorithm;
import com.sun.enterprise.web.connector.grizzly.ByteBufferFactory;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
/**
* Base class for <code>StreamAlgorithm</code> implementation.
* @author Jeanfrancois Arcand
*/
public abstract class StreamAlgorithmBase implements StreamAlgorithm{
/**
* Is Grizzly embedded in GlassFish.
*/
protected static boolean embeddedInGlassFish = false;
// Temporary hack to find if Grizzly is enbedded in GlassFish or not.
static{
try{
embeddedInGlassFish =
(Class.forName("org.apache.coyote.tomcat5.Constants") != null);
} catch(Exception ex){
; //Swallow
}
}
private int port = 8080;
/**
* Manipulate the bytes stream and determine if the process can continue.
*
* @return true if the algorithm determines the process can continue.
*/
public abstract boolean parse(ByteBuffer byteBuffer);
/**
* The actual length of the stream we are able to read.
*/
protected int contentLength = -1;
/**
* The <code>ByteBuffer</code> current limit value
*/
protected int curLimit = -1;
/**
* The <code>ByteBuffer</code> current position value
*/
protected int curPosition = -1;
/**
* The position, within the <code>ByteBuffer</code>, when the HTTP
* headers are completely reads.
*/
protected int headerLength = -1;
/**
* In case we were'nt able to parse the request line, we will continue
* parsing from that position.
*/
protected int lastStatePosition = -1;
/**
* If the stream wasn't read fully, keep the state of the http parsing.
*/
protected int state = 0;
/**
* If a new <code>ByteBuffer</code> is created because the stream is
* too small, cache the original byteBuffer and reuse it once the
* transaction has completed.
*/
protected ByteBuffer primaryByteBuffer = null;
/**
* If <code>true</code>, use a <code>ByteBuffer</code> view instead of
* <code>ByteBuffer</code>
*/
protected boolean useByteBufferView = false;
/**
* Are we using direct <code>ByteBuffer</code>
*/
protected boolean useDirectByteBuffer;
/**
* The <code>SocketChannel</code> associated with this algorithm.
*/
protected SocketChannel socketChannel;
/**
* An <code>Handler</code> implementation used to implement a
* static resources cache.
*/
protected Handler handler;
public StreamAlgorithmBase() {
handler = new DummyHandler();
}
// ------------------------------------------------------- Methods ------//
/**
* Return the stream content-length. If the content-length wasn't parsed,
* return -1.
*/
public int contentLength(){
return contentLength;
}
/**
* Return the stream header length. The header length is the length between
* the start of the stream and the first occurance of character '\r\n' .
*/
public int headerLength(){
return headerLength;
}
/**
* Before parsing the bytes, initialize and prepare the algorithm.
* @param byteBuffer the <code>ByteBuffer</code> used by this algorithm
* @return <code>ByteBuffer</code> used by this algorithm
*/
public ByteBuffer preParse(ByteBuffer byteBuffer){
if (byteBuffer.position() == byteBuffer.capacity()){
// Add space at the end for \n\r
int bufferSize = contentLength > 0 ?
contentLength + headerLength + 5:
byteBuffer.capacity() * 2;
byteBuffer = swapBuffer(byteBuffer,bufferSize);
}
return byteBuffer;
}
/**
* After parsing the bytes, post process the <code>ByteBuffer</code>
* @param byteBuffer the <code>ByteBuffer</code> used by this algorithm
* @return <code>ByteBuffer</code> used by this algorithm
*/
public ByteBuffer postParse(ByteBuffer byteBuffer){
// Swap buffer to its original size.
if ( primaryByteBuffer != null) {
primaryByteBuffer.clear();
byteBuffer = primaryByteBuffer;
primaryByteBuffer = null;
}
return byteBuffer;
}
/**
* Reset this object to its default state.
*/
public void recycle(){
contentLength = -1;
lastStatePosition= -1;
headerLength = -1;
curLimit = -1;
curPosition = -1;
state = 0;
}
// --------------------------------------------------- Utils --------------/
/**
* Allocate a <code>ByteBuffer</code>
* @param useDirectByteBuffer to create a direct <code>ByteBuffer</code>
* @param useByteBufferView to create <code>ByteBuffer</code> view
* @param size the size of the <code>ByteBuffer</code>
* @return a <code>ByteBuffer</code>
*/
public ByteBuffer allocate(boolean useDirectByteBuffer,
boolean useByteBufferView,
int size){
ByteBuffer byteBuffer;
if (useByteBufferView){
byteBuffer = ByteBufferFactory.allocateView(size,
useDirectByteBuffer);
} else if ( useDirectByteBuffer ){
byteBuffer = ByteBuffer.allocateDirect(size);
} else {
byteBuffer = ByteBuffer.allocate(size);
}
return byteBuffer;
}
/**
* Allocate a new <code>ByteBuffer</code> and put the content of the current
* one into it.
*/
private ByteBuffer swapBuffer(ByteBuffer byteBuffer, int size){
ByteBuffer tmp = allocate(useDirectByteBuffer,useByteBufferView, size);
byteBuffer.flip();
tmp.put(byteBuffer);
// Keep a pointer to the original one.
if ( primaryByteBuffer == null) {
primaryByteBuffer = byteBuffer;
}
byteBuffer = tmp;
return byteBuffer;
}
/**
* Rollback the <code>ByteBuffer</code> to its previous state in case
* an error as occured.
*/
public ByteBuffer rollbackParseState(ByteBuffer byteBuffer){
/**
* Set the <code>ByteBuffer</code> position/limit to the value
* they were before trying to process the stream.
*/
if (curLimit != -1 && curPosition != -1){
byteBuffer.limit(curLimit);
byteBuffer.position(curPosition);
// Reset so we can process a new request.
contentLength = -1;
headerLength = -1;
}
return byteBuffer;
}
/**
* Dump the ByteBuffer content. This is used only for debugging purpose.
*/
protected String dump(ByteBuffer byteBuffer){
ByteBuffer dd = byteBuffer.duplicate();
dd.flip();
int length = dd.limit();
byte[] dump = new byte[length];
dd.get(dump,0,length);
return(new String(dump) + "\n----------------------------" + dd
+ "\ncontentLength: " + contentLength
+ "\nheaderLength: " + headerLength);
}
/**
* The SocketChannel used by this class.
*/
public void setSocketChannel(SocketChannel socketChannel){
this.socketChannel = socketChannel;
if ( socketChannel != null)
handler.attachChannel(socketChannel);
}
/**
* Set the port
*/
public void setPort(int port){
this.port = port;
}
/**
* Return the port
*/
public int getPort(){
return port;
}
/**
* Return the full name of the class responsible for handling OP_READ.
*/
public Class getReadTask(SelectorThread selectorThread){
if ( selectorThread.getMaxReadWorkerThreads() <= 0
&& !selectorThread.getEnableAsyncExecution())
return com.sun.enterprise.web.connector.grizzly.DefaultReadTask.class;
else
return com.sun.enterprise.web.connector.grizzly.AsyncReadTask.class;
}
/**
* Empty handler used when Grizzly is bundled outside of GlassFish.
*
* @author Jeanfrancois Arcand
*/
public static class DummyHandler implements Handler{
public DummyHandler() {
}
public int handle(Object e, int handlerCode) throws IOException {
return Handler.CONTINUE;
}
public void attachChannel(SocketChannel sc){
; // Not used.
}
}
}
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