/*
    * Copyright 2005-2007 The Kuali Foundation
    * 
    * 
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
   * 
   * 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 org.kuali.rice.core.resourceloader;
  
  import org.apache.log4j.Logger;
  
  /**
   * Synchronization primitive that implements a condition that can be waited upon.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class ContextualConfigLock {
      private static final Logger LOG = Logger.getLogger(ContextualConfigLock.class);
  
      private String name;
      private boolean fired;
      private Object lock = new Object();
  
      public ContextualConfigLock() {
          this(null);
      }
  
      public ContextualConfigLock(String name) {
          if (name == null) {
              this.name = "<<anonymous>>";
          } else {
              this.name = name;
          }
      }
  
      public void await() {
          synchronized (lock) {
              while (!fired) {
                  try {
                      lock.wait();
                  } catch (InterruptedException ie) {
                      LOG.warn("Interrupted while waiting for condition: " + name, ie);
                  }
              }
          }
      }
  
      public boolean hasFired() {
          synchronized (lock) {
              return fired;
          }
      }
  
      public void fire() {
          synchronized (lock) {
              if (fired) return;
              fired = true;
              lock.notifyAll();
          }
      }
  
      public void reset() {
          synchronized (lock) {
              fired = false;
          }
      }
  
      public String toString() {
          return "[Condition: name=" + name + "]";
      }
  }