/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.activemq.memory;
public class CacheEntry {
public final Object key;
public final Object value;
public CacheEntry next;
public CacheEntry previous;
public CacheEntryList owner;
public CacheEntry(Object key, Object value) {
this.key = key;
this.value = value;
}
/**
* @return false if you are trying to remove the tail pointer.
*/
public boolean remove() {
// Cannot remove if this is a tail pointer.
// Or not linked.
if (owner == null || this.key == null || this.next == null) {
return false;
}
synchronized (owner.tail) {
this.next.previous = this.previous;
this.previous.next = this.next;
this.owner = null;
this.next = null;
this.previous = null;
}
return true;
}
}