com.sun.grizzly.http.algorithms.SeekHeaderAlgorithm Maven / Gradle / Ivy
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* Copyright 1999-2004 The Apache Software Foundation
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* you may not use this file except in compliance with the License.
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package com.sun.grizzly.http.algorithms;
import com.sun.grizzly.http.SelectorThread;
import java.nio.ByteBuffer;
import java.nio.BufferUnderflowException;
import java.util.logging.Level;
/**
* Predict if the NIO channel has been fully read or not. This lagorithm will
* first search for the content-length header, and use that value to determine if
* the bytes has been fully read or not. If the content-length isn't included,
* it will search for the end of the HTTP stream, which is a '\r\n' without
* buffering the body.
*
*
* @author Jean-Francois Arcand
*/
public final class SeekHeaderAlgorithm extends ContentLengthAlgorithm{
// ---------------------------------------------- Constructor ----------/
public SeekHeaderAlgorithm() {
super();
}
/**
* Parse the {@link ByteBuffer} and try to determine if the bytes
* stream has been fully read from the {@link SocketChannel}.
*
* Drain the {@link SocketChannel} and determine if the request bytes
* has been fully read. For POST method, parse the bytes and seek for the
* content-type header to determine the length of the request bytes.
* @return true if we need to call back the {@link SelectorThread}
* This occurs when the stream doesn't contains all the
* request bytes.
* false if the stream contains all request bytes.
*
* @paran byteBuffer the bytes read.
* @return true if the algorithm determines the end of the stream.
*/
@Override
@SuppressWarnings("empty-statement")
public boolean parse(ByteBuffer byteBuffer){
isFound = false;
curLimit = byteBuffer.limit();
curPosition = byteBuffer.position();
// Rule a - if we know the content length, verify all bytes are read
// Return true only if all bytes has been read.
if ( contentLength != -1 ){
byteBuffer.flip();
return isFound;
}
try{
// Rule b - If nothing, return to the Selector.
if (byteBuffer.position() == 0)
return false;
byteBuffer.flip();
lastValid = byteBuffer.limit();
// Rule c - Parse the request line
if ( !requestLineParsed ) {
requestLineParsed = parseRequestLine(byteBuffer);
if ( !requestLineParsed ) {
return false;
}
}
// Rule d -- Parse the headers, looking for content-length
while (parseHeader(byteBuffer));
return isFound;
} catch (BufferUnderflowException bue) {
SelectorThread.logger().log(Level.SEVERE,
"readTask.bufferunderflow", bue);
return false;
} finally {
byteBuffer.limit(curLimit);
byteBuffer.position(curPosition);
if (isFound){
byteBuffer.flip();
}
}
}
}