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package com.sun.enterprise.web.connector.grizzly;
import java.io.IOException;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.coyote.RequestGroupInfo;
/**
* Abstract implementation of a Task object.
*
* @author Jean-Francois Arcand
*/
public abstract class TaskBase implements Task, TaskListener {
private static final Logger LOGGER =
Logger.getLogger(TaskBase.class.getName());
private static final Level LOG_LEVEL = Level.FINEST;
/**
* This number represent a specific implementation of a Task
* instance.
*/
protected int type;
/**
* List of listeners
*/
protected ArrayList listeners;
/**
* The Pipeline object associated with this
* Task
*/
protected Pipeline pipeline;
/**
* The SelectionKey used by this task.
*/
protected SelectionKey key;
/**
* Recycle this task
*/
protected boolean recycle = true;
/**
* The SelectorThread who created this task.
*/
protected SelectorThread selectorThread;
// ------------------------------------------------------------------//
public int getType(){
return type;
}
/**
* Set the SelectorThread object.
*/
public void setSelectorThread(SelectorThread selectorThread){
this.selectorThread = selectorThread;
}
/**
* Return the SelectorThread
*/
public SelectorThread getSelectorThread(){
return selectorThread;
}
/**
* Set the pipeline on which Worker Threads will synchronize.
*/
public void setPipeline(Pipeline pipeline){
this.pipeline = pipeline;
}
/**
* Return the pipeline used by this object.
*/
public Pipeline getPipeline(){
return pipeline;
}
/**
* Set the SelectionKey
*/
public void setSelectionKey(SelectionKey key){
this.key = key;
}
/**
* Return the SelectionKey associated with this task.
*/
public SelectionKey getSelectionKey(){
return key;
}
/**
* Gets the RequestGroupInfo from this task.
*/
public RequestGroupInfo getRequestGroupInfo() {
return (selectorThread != null?
selectorThread.getRequestGroupInfo() : null);
}
/**
* Returns true if monitoring has been enabled, false
* otherwise.
*/
public boolean isMonitoringEnabled(){
return (selectorThread != null ?
selectorThread.isMonitoringEnabled() : false);
}
/**
* Gets the KeepAliveStats associated with this task.
*/
public KeepAliveStats getKeepAliveStats() {
return (selectorThread != null?
selectorThread.getKeepAliveStats() : null);
}
/**
* Execute the task based on its Pipeline. If the
* Pipeline is null, then execute the task on using the
* calling thread.
*/
public void execute() {
if (LOGGER.isLoggable(LOG_LEVEL)) {
LOGGER.log(LOG_LEVEL, "TaskBase.execute tb={0}", new Object[]{this});
}
if (pipeline != null) {
pipeline.addTask(this);
} else {
run();
}
}
//------------------------------------------------------Task Listener ----//
private void initListener(){
if ( listeners == null ){
listeners = new ArrayList();
}
}
/**
* Add the given TaskListener to this Task.
*/
public void addTaskListener(TaskListener task){
initListener();
listeners.add(task);
}
/**
* Remove the given TaskListener/code> from this
* Task.
*/
public void removeTaskListener(TaskListener task){
if (listeners == null) return;
listeners.remove(task);
}
/**
* Clean all the listeners of this Task
*/
public void clearTaskListeners(){
if (listeners == null) return;
listeners.clear();
}
/**
* Notify listeners.
*/
protected void fireTaskEvent(TaskEvent event){
if (listeners == null) return;
for (int i=0; i < listeners.size(); i++){
listeners.get(i).taskEvent(event);
}
}
/**
* Recycle internal state.
*/
public void recycle(){
}
/**
* Return all listeners of this Task.
*
* @return ArrayList containing all TaskListener
* instances registered with this Task
*/
public ArrayList getTaskListeners(){
initListener();
return listeners;
}
/**
* Some Pipeline implementation requires a instance of
* Runnable instance.
*/
public void run(){
try{
doTask();
} catch (IOException ex){
throw new RuntimeException(ex);
}
}
/**
* Declare whether this Task is recyclable. If so, this
* Task will be recycled after every invocation of
* doTask().
*/
public void setRecycle(boolean recycle){
this.recycle = recycle;
}
/**
* Return true if this Task is recyclable.
*/
public boolean getRecycle(){
return recycle;
}
/**
* Return the current Socket used by this instance
* @return socket the current Socket used by this instance
*/
public Socket getSocket(){
return null;
}
/**
* Return the underlying Channel, independent of the NIO
* mode we are using.
*/
private SocketChannel getChannel(){
if ( key == null ) {
return getSocket().getChannel();
} else {
return (SocketChannel)key.channel();
}
}
/**
* Cancel the task.
* @param message the HTTP message to included within the html page
* @param code The http code to use. If null, automatically close the
* connection without sending an error page.
*/
public void cancelTask(String message, String code){
SocketChannel channel = getChannel();
if (code != null) {
SelectorThread.logger().log(Level.WARNING,message);
try {
ByteBuffer byteBuffer = HtmlHelper.getErrorPage(message, code);
OutputWriter.flushChannel(channel,byteBuffer);
} catch (IOException ex){
SelectorThread.logger().log(Level.FINE,"CancelTask failed", ex);
}
}
if ( selectorThread.isEnableNioLogging() ){
SelectorThread.logger().log(Level.INFO, "Cancelling SocketChannel "
+ getChannel());
}
if ( key != null){
selectorThread.cancelKey(key);
} else if ( getSocket() != null ){
try{
getSocket().close();
} catch (IOException ex){
;
}
}
}
/**
* By default, do nothing when a Callable is invoked.
*/
public Object call() throws Exception{
return null;
}
public void taskEvent(TaskEvent event){
// Do nothing
}
}