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1   package org.apache.velocity.runtime;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.    
20   */
21  
22  import org.apache.velocity.runtime.parser.Parser;
23  
24  
25  /**
26   * Provides instances of parsers as needed.  get() will return a new parser if
27   * available.  If a parser is acquired from the pool, put() should be called
28   * with that parser to make it available again for reuse.
29   *
30   * @author <a href="mailto:sergek@lokitech.com">Serge Knystautas</a>
31   * @version $Id: RuntimeInstance.java 384374 2006-03-08 23:19:30Z nbubna $
32   */
33  public interface ParserPool
34  {
35      /**
36       * Initialize the pool so that it can begin serving parser instances.
37       * @param svc
38       */
39      void initialize(RuntimeServices svc);
40  
41      /**
42       * Retrieve an instance of a parser pool.
43       * @return A parser object.
44       */
45      Parser get();
46  
47      /**
48       * Return the parser to the pool so that it may be reused.
49       * @param parser
50       */
51      void put(Parser parser);
52  }