cvs commit: jakarta-turbine-jcs/sandbox/yajcache/src/org/apache/jcs/yajcache/lang/ref KeyedRefCollector.java

[hc...@apache.org]

hchar       2005/01/27 02:49:44

  Added:       sandbox/yajcache/src/org/apache/jcs/yajcache/lang/ref
                        KeyedRefCollector.java
  Log:
  keyed reference garbage collector
  
  Revision  Changes    Path
  1.1                  jakarta-turbine-jcs/sandbox/yajcache/src/org/apache/jcs/yajcache/lang/ref/KeyedRefCollector.java
  
  Index: KeyedRefCollector.java
  ===================================================================
  /*
   * Copyright 2001-2004 The Apache Software Foundation.
   *
   * 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 org.apache.jcs.yajcache.lang.ref;
  
  import java.lang.ref.Reference;
  import java.lang.ref.ReferenceQueue;
  import java.util.concurrent.ConcurrentMap;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import org.apache.jcs.yajcache.lang.annotation.*;
  
  /**
   * @author Hanson Char
   */
  @CopyRightApache
  public class KeyedRefCollector implements Runnable {
      private static final boolean debug = true;
      private Log log = debug ? LogFactory.getLog(this.getClass()) : null;
      private final @NonNullable ReferenceQueue q;
      private final @NonNullable ConcurrentMap<String, ? extends IKey> synMap;
      private volatile int count;
  
      public KeyedRefCollector(
              @NonNullable ReferenceQueue<?> q, 
              @NonNullable ConcurrentMap<String, ? extends IKey> synMap)
      {
          this.q = q;
          this.synMap = synMap;
      }
      public void run() {
          Reference ref;
          
          while ((ref = this.q.poll()) != null) {
              IKey keyedRef = (IKey)ref;
              // remove unused lock;  may fail but that's fine.
              synMap.remove(keyedRef.getKey(), ref);
              // referent should have been cleared by GC.
          }        
      }
      public int getCount() {
          return count;
      }
  }
  
  
  

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