Struts example source code file (ReferenceType.java)

This example Struts source code file (ReferenceType.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

phantom, phantom, referencetype, soft, soft, strong, strong, weak, weak

The Struts ReferenceType.java source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.opensymphony.xwork2.inject.util;

/**
 * Reference type. Used to specify what type of reference to keep to a
 * referent.
 *
 * @see java.lang.ref.Reference
 * @author crazybob@google.com (Bob Lee)
 */
public enum ReferenceType {

  /**
   * Prevents referent from being reclaimed by the garbage collector.
   */
  STRONG,

  /**
   * Referent reclaimed in an LRU fashion when the VM runs low on memory and
   * no strong references exist.
   *
   * @see java.lang.ref.SoftReference
   */
  SOFT,

  /**
   * Referent reclaimed when no strong or soft references exist.
   *
   * @see java.lang.ref.WeakReference
   */
  WEAK,

  /**
   * Similar to weak references except the garbage collector doesn't actually
   * reclaim the referent. More flexible alternative to finalization.
   *
   * @see java.lang.ref.PhantomReference
   */
  PHANTOM;
}