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/***************************************************************************
* Copyright 2014 Kieker Project (http://kieker-monitoring.net)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
***************************************************************************/
package teetime.framework.concurrent.steal;
import java.util.Collection;
import teetime.framework.concurrent.ConcurrentWorkStealingPipe;
import teetime.framework.core.IInputPort;
import teetime.framework.core.IStage;
/**
* @author Christian Wulf
*
* @since 1.10
*/
public class StealIfMayBeDisabledStrategy<T> implements IStealStrategy<T> {
public <S extends IStage> T steal(final IInputPort<S, T> inputPort, final Collection<ConcurrentWorkStealingPipe<T>> pipesToStealFrom) {
if (inputPort.getOwningStage().mayBeDisabled()) {
for (final ConcurrentWorkStealingPipe<T> pipe : pipesToStealFrom) {
final T stolenElement = pipe.steal();
if (stolenElement != null) {
return stolenElement;
}
}
}
// BETTER improve stealing efficiency by stealing multiple elements at once
return null; // do not expose internal impl details (here: CircularWorkStealingDeque); instead return null
}
}