com.sun.grizzly.util.CallbackHandlerSelectionKeyAttachment Maven / Gradle / Ivy
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package com.sun.grizzly.util;
import com.sun.grizzly.CallbackHandler;
import java.nio.channels.SelectionKey;
import java.util.concurrent.atomic.AtomicReference;
/**
* {@link SelectionKey} attachment, which wraps {@link CallbackHandler}
*
* @author Alexey Stashok
*/
public class CallbackHandlerSelectionKeyAttachment extends SelectionKeyAttachmentWrapper {
private static ConcurrentLinkedQueuePool pool =
new ConcurrentLinkedQueuePool() {
@Override
public CallbackHandlerSelectionKeyAttachment newInstance() {
return new CallbackHandlerSelectionKeyAttachment();
}
};
// Is used for key pooling
private AtomicReference associatedKey = new AtomicReference();
/**
* Creates the {@link CallbackHandler} to the {@link SelectionKey}
* CallbackHandler will not be attached directly, but wrapped with
* CallbackHandlerSelectionKeyAttachment
*/
public static CallbackHandlerSelectionKeyAttachment create(SelectionKey key,
CallbackHandler callbackHandler) {
CallbackHandlerSelectionKeyAttachment attachment = pool.poll();
attachment.associatedKey.set(key);
attachment.setAttachment(callbackHandler);
return attachment;
}
private CallbackHandlerSelectionKeyAttachment() {
}
@Override
public void release(SelectionKey selectionKey) {
if (associatedKey.getAndSet(null) == selectionKey) {
super.release(selectionKey);
pool.offer(this);
}
}
/**
* Callback handler never should lead to the timeout situation,
* as connections could use it, but perform IO operations in sync. mode.
* @return null
*/
@Override
public Long getTimeout() {
return null;
}
}