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package com.sun.enterprise.web.connector.grizzly;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.logging.Level;
/**
* This task execute and then notify its listener, which usualy execute on
* their own thread. The task perform the same operation as its parent,
* but the attached <code>ProcessorTask</code> execute on its own thread.
*
* @author Jean-Francois Arcand
*/
public class AsyncReadTask extends DefaultReadTask {
public AsyncReadTask(){
super();
}
// ----------------------------------------------------------------------//
public void initialize(StreamAlgorithm algorithm,
boolean useDirectByteBuffer, boolean useByteBufferView){
super.initialize(algorithm,useDirectByteBuffer,useByteBufferView);
byteBuffer = algorithm.allocate(useDirectByteBuffer,
useByteBufferView,selectorThread.getBufferSize());
}
/**
* Read data from the socket and process it using this thread, and only if
* the <code>StreamAlgorith</code> stategy determine no more bytes are
* are needed.
*/
public void doTask() throws IOException {
doTask(byteBuffer);
}
/**
* Manage the <code>SelectionKey</code>
*/
protected void manageKeepAlive(boolean keepAlive,int count,
Exception exception){
// The key is invalid when the Task has been cancelled.
if ( count <= 0 || exception != null){
if ( exception != null){
// Make sure we have detached the processorTask
detachProcessor();
if (SelectorThread.logger().isLoggable(Level.FINE)){
SelectorThread.logger().log
(Level.FINE,
"SocketChannel Read Exception:",exception);
}
}
terminate(false);
}
}
/**
* Execute the <code>ProcessorTask</code>
* @return false if the request wasn't fully read by the channel.
* so we need to respin the key on the Selector.
*/
public boolean executeProcessorTask() throws IOException{
boolean registerKey = false;
if (SelectorThread.logger().isLoggable(Level.FINEST))
SelectorThread.logger().log(Level.FINEST,"executeProcessorTask");
if ( algorithm.getHandler() != null && algorithm.getHandler()
.handle(null, Handler.REQUEST_BUFFERED) == Handler.BREAK ){
return true;
}
// Get a processor task. If the processorTask != null, that means we
// failed to load all the bytes in a single channel.read().
if (processorTask == null){
attachProcessor(selectorThread.getProcessorTask());
} else {
// When spawnProcessorTask is true, we must reconfigure the
// ProcessorTask
configureProcessorTask();
}
if (taskEvent == null){
taskContext = new TaskContext();
taskEvent = new TaskEvent<TaskContext>(taskContext);
}
// Call the listener and execute the task on it's own pipeline.
taskEvent.setStatus(TaskEvent.START);
taskContext.setInputStream(inputStream);
taskEvent.attach(taskContext);
fireTaskEvent(taskEvent);
return false;
}
/**
* Clear the current state and make this object ready for another request.
*/
public void recycle(){
byteBuffer = algorithm.postParse(byteBuffer);
byteBuffer.clear();
inputStream.recycle();
algorithm.recycle();
key = null;
inputStream.setSelectionKey(null);
}
/**
* Set the underlying <code>ByteBuffer</code> used by this class.
*/
public void setByteBuffer(ByteBuffer srcBB){
if ( srcBB != byteBuffer){
if (srcBB.capacity() > byteBuffer.capacity()) {
byteBuffer = algorithm.allocate(useDirectByteBuffer,
useByteBufferView,srcBB.capacity());
}
srcBB.flip();
byteBuffer.put(srcBB);
srcBB.clear();
} else {
byteBuffer = srcBB;
}
}
/**
* Complete the transaction.
*/
public void terminate(boolean keepAlive){
if (keepAlive){
detachProcessor();
registerKey();
returnTask();
} else {
super.terminate(keepAlive);
}
}
/**
* Set appropriate attribute on the <code>ProcessorTask</code>.
*/
public void configureProcessorTask(){
super.configureProcessorTask();
if ( !getTaskListeners().contains(processorTask) ){
processorTask.addTaskListener(this);
addTaskListener((TaskListener)processorTask);
}
}
}
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