plugins/svn4idea/src/org/jetbrains/idea/svn/ThreadLocalDefendedInvoker.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 org.jetbrains.idea.svn;
  17
  18 public abstract class ThreadLocalDefendedInvoker<T> {
  19   protected final ThreadLocal<Boolean> myThreadLocal;
  20
  21   protected ThreadLocalDefendedInvoker() {
  22     myThreadLocal = new ThreadLocal<Boolean>() {
  23       @Override
  24       protected Boolean initialValue() {
  25         return Boolean.TRUE;
  26       }
  27     };
  28   }
  29
  30   protected abstract T execute();
  31
  32   public boolean isInside() {
  33     return ! Boolean.TRUE.equals(myThreadLocal.get());
  34   }
  35
  36   public boolean isOutside() {
  37     return ! isInside();
  38   }
  39
  40   public T executeDefended() {
  41     try {
  42       myThreadLocal.set(Boolean.FALSE);
  43       return execute();
  44     } finally {
  45       myThreadLocal.set(Boolean.TRUE);
  46     }
  47   }
  48 }