| /* |
| * 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.concurrency; |
| |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| /** |
| * Executes given runnable exactly once. |
| * <p/> |
| * Author: dmitrylomov |
| */ |
| public class DoOnce { |
| private final AtomicReference<Runnable> myRunnable; |
| |
| public DoOnce(@NotNull Runnable runnable) { |
| myRunnable = new AtomicReference<Runnable>(runnable); |
| } |
| |
| public void execute() { |
| Runnable runnable = myRunnable.getAndSet(null); |
| if (runnable != null) { |
| runnable.run(); |
| } |
| } |
| } |