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Optimize AbstractListenableFuture Memory Allocations #28

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Optimize AbstractListenableFuture Memory Allocations #28

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19 changes: 13 additions & 6 deletions src/main/java/net/spy/memcached/internal/AbstractListenableFuture.java
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Original file line number Diff line number Diff line change
Expand Up @@ -141,15 +141,22 @@ protected void notifyListeners() {
* @param future the future to pass on to the listeners.
*/
protected void notifyListeners(final Future<?> future) {
final List<GenericCompletionListener<? extends Future<T>>> copy =
new ArrayList<GenericCompletionListener<? extends Future<T>>>();
final List<GenericCompletionListener<? extends Future<T>>> copy;
synchronized(this) {
copy.addAll(listeners);
if (listeners.isEmpty()) {
copy = null;
}
else {
copy = new ArrayList<GenericCompletionListener
<? extends Future<T>>>(listeners);
}
listeners = new ArrayList<GenericCompletionListener<? extends Future<T>>>();
}
for (GenericCompletionListener<? extends Future<? super T>> listener
: copy) {
notifyListener(executor(), future, listener);
if (copy != null) {
for (GenericCompletionListener<? extends Future<? super T>> listener
: copy) {
notifyListener(executor(), future, listener);
}
}
}

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