/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.util.concurrent;
/**
* Busy spin strategy targeted at lowest possible latency. This strategy will monopolise a thread to achieve the lowest
* possible latency. Useful for creating bubbles in the execution pipeline of tight busy spin loops with no other
* logic than status checks on progress.
*/
public class BusySpinIdleStrategy implements IdleStrategy {
private int dummyCounter;
public boolean idle(final long n) {
final int dummyValue = 64;
// Trick speculative execution into not progressing
if (dummyCounter > 0) {
if (Math.random() > 0) {
--dummyCounter;
}
} else {
dummyCounter = dummyValue;
}
return true;
}
}