com.google.errorprone.annotations.concurrent.LazyInit Maven / Gradle / Ivy
/*
* Copyright 2015 Google 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.google.errorprone.annotations.concurrent;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Use this annotation on any static or field that will be initialized lazily,
* where races yield no semantic difference in the code. The canonical
* example of this is String.hashCode():
*
*
* {@code
* public int hashCode() {
* int h = hash;
* if (h == 0 && value.length > 0) {
* char val[] = value;
*
* for (int i = 0; i < value.length; i++) {
* h = 31 * h + val[i];
* }
* hash = h;
* }
* return h;
* }
* }
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface LazyInit {
}