/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* 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.intellij.util.concurrency;
import com.intellij.openapi.application.AccessToken;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
/**
* Intended to use within try-with-resources.
*/
public class LockToken extends AccessToken {
private final Lock myLock;
private LockToken(Lock lock) {
myLock = lock;
}
@Override
public void finish() {
myLock.unlock();
}
@NotNull
public static LockToken acquireLock(@NotNull Lock lock) {
lock.lock();
return new LockToken(lock);
}
@Nullable
public static LockToken attemptLock(@NotNull Lock lock, long time) throws InterruptedException {
if (lock.tryLock(time, TimeUnit.MILLISECONDS)) {
return new LockToken(lock);
}
else {
return null;
}
}
}