net.openhft.chronicle.algo.locks.ReadWriteUpdateLockingStrategy Maven / Gradle / Ivy
/*
* Copyright 2014 Higher Frequency Trading http://www.higherfrequencytrading.com
*
* 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 net.openhft.chronicle.algo.locks;
import net.openhft.chronicle.algo.bytes.Access;
/**
* Logic of read-write-update lock state transitions.
*
* Read lock - could be several at the same time.
* Update lock - doesn't block reads, but couldn't be several update locks at the same time
* Write lock - exclusive
*/
public interface ReadWriteUpdateLockingStrategy extends ReadWriteLockingStrategy {
boolean tryUpdateLock(Access access, T t, long offset);
boolean tryUpgradeReadToUpdateLock(Access access, T t, long offset);
boolean tryUpgradeUpdateToWriteLock(Access access, T t, long offset);
void updateUnlock(Access access, T t, long offset);
void downgradeUpdateToReadLock(Access access, T t, long offset);
void downgradeWriteToUpdateLock(Access access, T t, long offset);
boolean isUpdateLocked(long state);
}