platform/vcs-impl/src/com/intellij/openapi/vcs/ZipperUpdater.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.openapi.vcs;
  17
  18 import com.intellij.openapi.progress.SomeQueue;
  19 import com.intellij.util.Alarm;
  20
  21 @SomeQueue
  22 public class ZipperUpdater {
  23   private final Alarm myAlarm;
  24   private boolean myRaised;
  25   private final Object myLock = new Object();
  26   private final int myDelay;
  27
  28   public ZipperUpdater(final int delay) {
  29     myDelay = delay;
  30     myAlarm = new Alarm(Alarm.ThreadToUse.SHARED_THREAD);
  31   }
  32
  33   public void queue(final Runnable runnable) {
  34     queue(runnable, false);
  35   }
  36
  37   public void queue(final Runnable runnable, final boolean urgent) {
  38     synchronized (myLock) {
  39       myRaised = true;
  40     }
  41     myAlarm.addRequest(new Runnable() {
  42       public void run() {
  43         synchronized (myLock) {
  44           if (! myRaised) return;
  45           myRaised = false;
  46         }
  47         runnable.run();
  48       }
  49     }, urgent ? 0 : myDelay);
  50   }
  51 }