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*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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* Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
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* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package com.sun.grizzly;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
/**
* Default ProtocolChain implementation.
*
* @author Jeanfrancois Arcand
*/
public class DefaultProtocolChain implements ProtocolChain, ReinvokeAware {
public enum Phase {EXECUTE, POST_EXECUTE};
/**
* The list of ProtocolFilter this chain will invoke.
*/
protected final List protocolFilters;
/**
* The list of {@link EventHandler}s, which will be notified about this
* {@link ProtocolChain} events
*/
protected final List eventHandlers;
/**
* true if a pipelined execution is required. A pipelined execution
* occurs when a ProtocolFilter implementation set the
* ProtocolFilter.READ_SUCCESS as an attribute to a Context. When this
* attribute is present, the ProtocolChain will not release the current
* running Thread and will re-execute all its ProtocolFilter.
*/
protected boolean continousExecution = false;
public DefaultProtocolChain() {
protocolFilters = new ArrayList(4);
//ArrayList is faster then HashSet for small datasets.
eventHandlers = new ArrayList(4);
}
/**
* Execute this ProtocolChain.
* @param ctx {@link Context}
* @throws java.lang.Exception
*/
public void execute(Context ctx) throws Exception {
execute(ctx,0);
}
/**
* Execute this ProtocolChain.
* @param ctx {@link Context}
* @param firstFilter The first filter to be invoked.
* @throws java.lang.Exception
*/
public void execute(Context ctx, int firstFilter) throws Exception {
if (protocolFilters.size() != 0){
boolean reinvokeChain = true;
while (reinvokeChain){
int currentPosition = executeProtocolFilter(ctx,firstFilter);
reinvokeChain = postExecuteProtocolFilter(currentPosition, ctx);
}
}
}
/**
* Execute the ProtocolFilter.execute method. If a ProtocolFilter.execute
* return false, avoid invoking the next ProtocolFilter.
* @param ctx {@link Context}
* @return position of next {@link ProtocolFilter} to exexute
*/
protected int executeProtocolFilter(Context ctx) {
return executeProtocolFilter(ctx,0);
}
/**
* Execute the ProtocolFilter.execute method. If a ProtocolFilter.execute
* return false, avoid invoking the next ProtocolFilter.
* @param ctx {@link Context}
* @param firstFilter The first filter position to be invoked.
* @return position of next {@link ProtocolFilter} to exexute
*/
protected int executeProtocolFilter(Context ctx, int firstFilter) {
boolean invokeNext;
int size = protocolFilters.size();
int currentPosition = 0;
ProtocolFilter protocolFilter = null;
for (int i=firstFilter; i < size; i++) {
try {
protocolFilter = protocolFilters.get(i);
invokeNext = protocolFilter.execute(ctx);
} catch (Exception ex){
invokeNext = false;
i--;
Controller.logger().log(Level.SEVERE,
"ProtocolChain exception",ex);
notifyException(Phase.EXECUTE, protocolFilter, ex);
}
currentPosition = i;
if ( !invokeNext ) break;
}
return currentPosition;
}
/**
* Execute the ProtocolFilter.postExcute.
* @param currentPosition position in list of {@link ProtocolFilter}s
* @param ctx {@link Context}
* @return false, always false
*/
protected boolean postExecuteProtocolFilter(int currentPosition,Context ctx) {
boolean invokeNext = true;
ProtocolFilter tmpHandler = null;
boolean reinvokeChain = false;
for (int i = currentPosition; i > -1; i--){
try{
tmpHandler = protocolFilters.get(i);
invokeNext = tmpHandler.postExecute(ctx);
} catch (Exception ex){
Controller.logger().log(Level.SEVERE,
"ProtocolChain exception",ex);
notifyException(Phase.POST_EXECUTE, tmpHandler, ex);
}
if ( !invokeNext ) {
break;
}
}
ProtocolChainInstruction postInstruction =
(ProtocolChainInstruction) ctx.removeAttribute(
PROTOCOL_CHAIN_POST_INSTRUCTION);
if (postInstruction != null &&
postInstruction == ProtocolChainInstruction.REINVOKE) {
reinvokeChain = true;
} else if (continousExecution
&& (Boolean)ctx.removeAttribute(ProtocolFilter.SUCCESSFUL_READ)
== Boolean.TRUE) {
reinvokeChain = true;
}
return reinvokeChain;
}
/**
* Remove a ProtocolFilter.
* @param theFilter the ProtocolFilter to remove
* @return removed ProtocolFilter
*/
public boolean removeFilter(ProtocolFilter theFilter) {
return protocolFilters.remove(theFilter);
}
/**
* Add the {@link ProtocolFilter} to this {@link ProtocolChain}
* @param protocolFilter to add
* @return
*/
public boolean addFilter(ProtocolFilter protocolFilter) {
return protocolFilters.add(protocolFilter);
}
/**
* Insert a ProtocolFilter at position pos.
* @param pos
* @param protocolFilter
*/
public void addFilter(int pos, ProtocolFilter protocolFilter){
protocolFilters.add(pos,protocolFilter);
}
/**
*Insert a ProtocolFilter at position pos.
* @param pos - position in this ProtocolChain
* @param protocolFilter - {@link ProtocolFilter} to insert
* @return {@link ProtocolFilter} that was set
*/
public ProtocolFilter setProtocolFilter(int pos,
ProtocolFilter protocolFilter) {
return protocolFilters.set(pos,protocolFilter);
}
/**
* Set to true if the current {@link ExecutorService} can
* re-execute its ProtocolFilter(s) after a successful execution. Enabling
* this property is useful for protocol that needs to support pipelined
* message requests as the ProtocolFilter are automatically re-executed,
* avoiding the overhead of releasing the current Thread, registering
* back the SelectionKey to the SelectorHandler and waiting for a new
* NIO event.
*
* Some protocols (like http) can get the http headers in one
* SocketChannel.read, parse the message and then get the next http message
* on the second SocketChannel.read(). Not having to release the Thread
* and re-execute the ProtocolFilter greatly improve performance.
* @param continousExecution true to enable continuous execution.
* (default is false).
*/
public void setContinuousExecution(boolean continousExecution){
this.continousExecution = continousExecution;
for (ProtocolFilter filter : protocolFilters){
if (filter instanceof ReinvokeAware){
((ReinvokeAware) filter).setContinuousExecution(continousExecution);
break;
}
}
}
/**
* Return true if the current {@link ExecutorService} can
* re-execute its ProtocolFilter after a successful execution.
*/
public boolean isContinuousExecution(){
return continousExecution;
}
/**
* Add the {@link EventHandler}
* @param eventHandler
* @return true, if {@link EventHandler} was added, false otherwise
*/
public boolean addEventHandler(EventHandler eventHandler) {
return eventHandlers.add(eventHandler);
}
/**
* Remove the {@link EventHandler}.
* @param eventHandler the ProtocolFilter to remove
* @return true, if {@link EventHandler} was removed, false otherwise
*/
public boolean removeEventHandler(EventHandler eventHandler) {
return eventHandlers.remove(eventHandler);
}
/**
* Notifies all {@link EventHandler}s about exception, which occured
* @param phase execution Phase, where exception occured
* @param filter {@link ProtocolFilter}, where exception occured
* @param throwable actual exception
*/
protected void notifyException(Phase phase, ProtocolFilter filter,
Throwable throwable) {
for(int i=0;i
