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package com.sun.grizzly.standalone;
import com.sun.grizzly.http.Constants;
import com.sun.grizzly.http.FileCacheFactory;
import com.sun.grizzly.util.Interceptor;
import com.sun.grizzly.http.FileCache;
import com.sun.grizzly.http.SelectorThread;
import java.io.IOException;
import java.nio.channels.SocketChannel;
import com.sun.grizzly.tcp.Request;
import com.sun.grizzly.util.buf.Ascii;
import com.sun.grizzly.util.buf.ByteChunk;
import com.sun.grizzly.util.buf.MessageBytes;
import com.sun.grizzly.util.http.MimeHeaders;
/**
* This {@link Interceptor} is invoked after the request line has been parsed.
*
* @author Jeanfrancois Arcand
*/
public class StaticHandler implements Interceptor<Request,SocketChannel> {
/**
* The {@link SocketChannel} used to send a static resources.
*/
protected SocketChannel socketChannel;
/**
* The FileCache mechanism used to cache static resources.
*/
protected FileCache fileCache;
// ----------------------------------------------------- Constructor ----//
public StaticHandler(){
}
/**
* Attach a {@link SocketChannel} to this object.
*/
public void attachChannel(SocketChannel socketChannel){
this.socketChannel = socketChannel;
if ( fileCache == null && socketChannel != null){
fileCache = FileCacheFactory.getFactory(
socketChannel.socket().getLocalAddress(),
socketChannel.socket().getLocalPort()).getFileCache();
}
}
/**
* Intercept the request and decide if we cache the static resource. If the
* static resource is already cached, return it.
*/
public int handle(Request req, int handlerCode) throws IOException{
if (fileCache == null) {
return Interceptor.CONTINUE;
}
if (handlerCode == Interceptor.RESPONSE_PROCEEDED && fileCache.isEnabled()){
String docroot = SelectorThread.getSelector(
socketChannel.socket().getLocalAddress(),
socketChannel.socket().getLocalPort()).getWebAppRootPath();
String uri = req.requestURI().toString();
fileCache.add(FileCache.DEFAULT_SERVLET_NAME,docroot,
uri,
req.serverName().toString(),
req.getResponse().getMimeHeaders(),
false);
} else if (handlerCode == Interceptor.REQUEST_LINE_PARSED) {
if (fileCache.sendCache(req)){
return Interceptor.BREAK;
}
}
return Interceptor.CONTINUE;
}
/**
* Get the keep-alive header.
*/
protected boolean keepAlive(Request request){
MimeHeaders headers = request.getMimeHeaders();
// Check connection header
MessageBytes connectionValueMB = headers.getValue("connection");
if (connectionValueMB != null) {
ByteChunk connectionValueBC = connectionValueMB.getByteChunk();
if (findBytes(connectionValueBC, Constants.CLOSE_BYTES) != -1) {
return false;
} else if (findBytes(connectionValueBC,
Constants.KEEPALIVE_BYTES) != -1) {
return true;
}
}
return false;
}
/**
* Specialized utility method: find a sequence of lower case bytes inside
* a ByteChunk.
*/
protected int findBytes(ByteChunk bc, byte[] b) {
byte first = b[0];
byte[] buff = bc.getBuffer();
int start = bc.getStart();
int end = bc.getEnd();
// Look for first char
int srcEnd = b.length;
for (int i = start; i <= (end - srcEnd); i++) {
if (Ascii.toLower(buff[i]) != first) continue;
// found first char, now look for a match
int myPos = i+1;
for (int srcPos = 1; srcPos < srcEnd; ) {
if (Ascii.toLower(buff[myPos++]) != b[srcPos++])
break;
if (srcPos == srcEnd) return i - start; // found it
}
}
return -1;
}
public void reset() {
fileCache = null;
socketChannel = null;
}
}