com.intellij.openapi.util.VolatileNotNullLazyValue Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of util Show documentation
Show all versions of util Show documentation
A packaging of the IntelliJ Community Edition util library.
This is release number 1 of trunk branch 142.
The newest version!
/*
* Copyright 2000-2013 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.openapi.util;
import org.jetbrains.annotations.NotNull;
/**
* @author peter
*/
public abstract class VolatileNotNullLazyValue extends NotNullLazyValue {
private static final RecursionGuard ourGuard = RecursionManager.createGuard("VolatileNotNullLazyValue");
private volatile T myValue;
@Override
@NotNull
public final T getValue() {
T value = myValue;
if (value == null) {
RecursionGuard.StackStamp stamp = ourGuard.markStack();
value = compute();
if (stamp.mayCacheNow()) {
myValue = value;
}
}
return value;
}
}