| /* |
| * Copyright 2000-2014 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 com.intellij.Patches; |
| import com.intellij.util.xmlb.annotations.Transient; |
| |
| import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; |
| |
| /** |
| * Created by Max Medvedev on 28/03/14 |
| */ |
| public class SimpleModificationTracker implements ModificationTracker { |
| static { |
| // field made public to workaround bug in JDK7 when AtomicIntegerFieldUpdater can't be created for private field, even from within its own class |
| // fixed in JDK8 |
| assert Patches.JDK_BUG_ID_7103570; |
| } |
| |
| @Transient |
| public volatile int myCounter; |
| |
| @Override |
| public long getModificationCount() { |
| return myCounter; |
| } |
| |
| private static final AtomicIntegerFieldUpdater<SimpleModificationTracker> UPDATER = AtomicIntegerFieldUpdater.newUpdater(SimpleModificationTracker.class, "myCounter"); |
| |
| public void incModificationCount() { |
| UPDATER.incrementAndGet(this); |
| } |
| } |