platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ControlledCycle.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.changes;
  17
  18 import com.intellij.lifecycle.AtomicSectionsAware;
  19 import com.intellij.lifecycle.ControlledAlarmFactory;
  20 import com.intellij.lifecycle.SlowlyClosingAlarm;
  21 import com.intellij.openapi.diagnostic.Logger;
  22 import com.intellij.openapi.progress.ProcessCanceledException;
  23 import com.intellij.openapi.project.Project;
  24 import com.intellij.util.Alarm;
  25 import org.jetbrains.annotations.NotNull;
  26
  27 import java.util.concurrent.atomic.AtomicBoolean;
  28
  29 public class ControlledCycle implements Runnable {
  30   private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.vcs.changes.ControlledCycle");
  31
  32   private final Alarm mySimpleAlarm;
  33   private final SlowlyClosingAlarm myControlledAlarm;
  34   // this interval is also to check for not initialized paths, so it is rather small
  35   private static final int ourRefreshInterval = 10000;
  36   private final int myRefreshInterval;
  37   private final Runnable myRunnable;
  38
  39   private final AtomicBoolean myActive;
  40
  41   public ControlledCycle(final Project project, final MyCallback callback, @NotNull final String name) {
  42     this(project, callback, name, -1);
  43   }
  44
  45   public ControlledCycle(final Project project, final MyCallback callback, @NotNull final String name, final int refreshInterval) {
  46     myRefreshInterval = (refreshInterval <= 0) ? ourRefreshInterval : refreshInterval;
  47     myActive = new AtomicBoolean(false);
  48     myRunnable = new Runnable() {
  49       boolean shouldBeContinued = true;
  50       public void run() {
  51         try {
  52           shouldBeContinued = callback.call(myControlledAlarm);
  53         } catch (ProcessCanceledException e) {
  54           return;
  55         } catch (RuntimeException e) {
  56           LOG.info(e);
  57         }
  58         if (! shouldBeContinued) {
  59           myActive.set(false);
  60         } else {
  61           mySimpleAlarm.addRequest(ControlledCycle.this, myRefreshInterval);
  62         }
  63       }
  64     };
  65     mySimpleAlarm = new Alarm(Alarm.ThreadToUse.SHARED_THREAD, project);
  66     myControlledAlarm = ControlledAlarmFactory.createOnApplicationPooledThread(project, name);
  67   }
  68
  69   public void start() {
  70     final boolean wasSet = myActive.compareAndSet(false, true);
  71     if (wasSet) {
  72       mySimpleAlarm.addRequest(this, myRefreshInterval);
  73     }
  74   }
  75
  76   public void run() {
  77     try {
  78       myControlledAlarm.checkShouldExit();
  79       myControlledAlarm.addRequest(myRunnable);
  80     } catch (ProcessCanceledException e) {
  81       //
  82     }
  83   }
  84
  85   public interface MyCallback {
  86     boolean call(final AtomicSectionsAware atomicSectionsAware);
  87   }
  88 }