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Java example source code file (StringBufferPool.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

faststringbuffer, objectpool, stringbufferpool

The StringBufferPool.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 1999-2004 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.
 */
/*
 * $Id: StringBufferPool.java,v 1.2.4.1 2005/09/15 08:15:54 suresh_emailid Exp $
 */
package com.sun.org.apache.xml.internal.utils;

/**
 * This class pools string buffers, since they are reused so often.
 * String buffers are good candidates for pooling, because of
 * their supporting character arrays.
 * @xsl.usage internal
 */
public class StringBufferPool
{

  /** The global pool of string buffers.   */
  private static ObjectPool m_stringBufPool =
    new ObjectPool(com.sun.org.apache.xml.internal.utils.FastStringBuffer.class);

  /**
   * Get the first free instance of a string buffer, or create one
   * if there are no free instances.
   *
   * @return A string buffer ready for use.
   */
  public synchronized static FastStringBuffer get()
  {
    return (FastStringBuffer) m_stringBufPool.getInstance();
  }

  /**
   * Return a string buffer back to the pool.
   *
   * @param sb Must be a non-null reference to a string buffer.
   */
  public synchronized static void free(FastStringBuffer sb)
  {
    // Since this isn't synchronized, setLength must be
    // done before the instance is freed.
    // Fix attributed to Peter Speck <speck@ruc.dk>.
    sb.setLength(0);
    m_stringBufPool.freeInstance(sb);
  }
}

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