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package com.sun.enterprise.web.ara;
import com.sun.enterprise.web.connector.grizzly.Pipeline;
import com.sun.enterprise.web.connector.grizzly.ReadTask;
import com.sun.enterprise.web.connector.grizzly.SelectorThread;
import com.sun.enterprise.web.connector.grizzly.SelectorThreadConfig;
import com.sun.enterprise.web.connector.grizzly.StreamAlgorithm;
import com.sun.enterprise.web.connector.grizzly.Task;
import com.sun.enterprise.web.connector.grizzly.TaskEvent;
import com.sun.enterprise.web.connector.grizzly.TaskListener;
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.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;
import java.util.logging.Level;
/**
* This task is used to configure an instance of <code>.ReadTask</code> based
* on the <code>Rule</code> implementation.
*
* @author Jeanfrancois Arcand
*/
public class IsolatedTask extends TaskWrapper implements TaskListener{
public final static int ISOLATED_TASK = 4;
/**
* The algorithm used to determine the context-root, the HTTP method,
* the protocol etc.
*/
protected StreamAlgorithm algorithm;
/**
* The <code>RuleExecutor</code> used to apply <code>Rule</code>
*/
protected RulesExecutor rulesExecutor;
/**
* List of listeners
*/
protected ArrayList<TaskListener> listeners = new ArrayList<TaskListener>();
/**
* The <code>ByteBuffer</code> initial position before applying the
* <code>Algorithm</code>
*/
protected int initialBytePosition;
/**
* The <code>ByteBuffer</code> initial limit before applying the
* <code>Algorithm</code>
*/
protected int initialByteLimit;
/**
* The <code>TaskEvent</code> used between this task and it's attached
* <code>ReadTask</code>
*/
protected TaskEvent<IsolatedTask> taskEvent;
/**
* The Thread Pool wrapper.
*/
protected Pipeline pipeline;
/**
* Cache the <code>SelectionKey</code> to avoid parsing the
* requests bytes more than once.
*/
private static ConcurrentHashMap<SelectionKey,Pipeline> cacheKey =
new ConcurrentHashMap<SelectionKey,Pipeline>();
public IsolatedTask(){
taskEvent = new TaskEvent<IsolatedTask>();
taskEvent.attach(this);
taskEvent.setStatus(TaskEvent.COMPLETED);
}
/**
* Apply a set of <code>Rule</code>s to the current bytes requests using
* an instance of <code>ReadTask</code> byte buffer. Once the
* <code>Rule</code> has been successfully applied, execute it.
*/
public void doTask() throws IOException {
try {
ReadTask readTask = (ReadTask)wrappedTask;
ByteBuffer byteBuffer = readTask.getByteBuffer();
SocketChannel socketChannel =
(SocketChannel)readTask.getSelectionKey().channel();
Socket socket = socketChannel.socket();
socketChannel.read(byteBuffer);
int position = byteBuffer.position();
int limit = byteBuffer.limit();
// If we weren't able to parse the token, return to the
// SelectorThread
boolean execute = false;
if (algorithm.parse(byteBuffer)) {
execute = rulesExecutor.execute(this);
if ( execute ){
// Tell the ReadTask to not load bytes and re-use the one
// already loaded.
readTask.setBytesAvailable(true);
byteBuffer.limit(limit);
byteBuffer.position(position);
// Get notification once the task has completed.
readTask.addTaskListener(this);
readTask.execute();
} else {
fireTaskEvent(taskEvent);
}
} else {
// Failed to read the URI. Close the connections.
readTask.terminate(false);
fireTaskEvent(taskEvent);
}
} catch (Exception ex){
SelectorThread.logger()
.log(Level.SEVERE,"IsolatedTask logic exception.",ex);
}
}
/**
* Set the <code>RuleExecutor</code> instance used by this task.
*/
public void setRulesExecutor(RulesExecutor rulesExecutor){
this.rulesExecutor = rulesExecutor;
}
/**
* Set the <code>Algorithm</code> used by this task.
*/
public void setAlgorithm(StreamAlgorithm algorithm){
this.algorithm = algorithm;
}
/**
* Wrao the <code>Task</code> with this task.
*/
public IsolatedTask wrap(Task task){
wrappedTask = task;
return this;
}
// ------------------------------------------------------ Execution -----//
/**
* Execute that task using the current Thread.
*/
public void execute(){
run();
}
/**
* Execute the logic required to isolate the task.
*/
public void run(){
try{
doTask();
} catch (IOException ex){
throw new RuntimeException(ex);
};
}
// ----------------------------------------------------- Task Listener ----/
/**
* Add the given <code>TaskListener</code> to this <code>Task</code>.
*/
public void addTaskListener(TaskListener task){
listeners.add(task);
}
/**
* Remove the given <code>TaskListener/code> from this
* <code>Task</code>.
*/
public void removeTaskListener(TaskListener task){
listeners.remove(task);
}
/**
* Clean all the listeners of this <code>Task</code>
*/
public void clearTaskListeners(){
listeners.clear();
}
/**
* Notify listeners of that class that the processing has completed.
*/
protected void fireTaskEvent(TaskEvent<?> event){
for (int i=0; i < listeners.size(); i++){
listeners.get(i).taskEvent(event);
}
}
/**
* Remove the <code>SelectionKey</code> from the cache.
*/
public void taskEvent(TaskEvent event) {
wrappedTask = null;
fireTaskEvent(taskEvent);
((ReadTask)event.attachement()).setPipeline(pipeline);
}
/**
* This task type.
*/
public int getType(){
return ISOLATED_TASK;
}
/**
* Set the <code>Thread</code> pool wrapper.
*/
public void setPipeline(Pipeline pipeline) {
this.pipeline = pipeline;
}
/**
* Get the <code>Thread</code> pool wrapper.
*/
public Pipeline getPipeline() {
return pipeline;
}
}
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