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package org.apache.velocity.runtime;

/*
 * 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.    
 */

import org.apache.velocity.runtime.parser.Parser;


/**
 * Provides instances of parsers as needed.  get() will return a new parser if
 * available.  If a parser is acquired from the pool, put() should be called
 * with that parser to make it available again for reuse.
 *
 * @author Serge Knystautas
 * @version $Id: RuntimeInstance.java 384374 2006-03-08 23:19:30Z nbubna $
 * @since 1.5
 */
public interface ParserPool
{
    /**
     * Initialize the pool so that it can begin serving parser instances.
     * @param svc
     */
    void initialize(RuntimeServices svc);

    /**
     * Retrieve an instance of a parser pool.
     * @return A parser object.
     */
    Parser get();

    /**
     * Return the parser to the pool so that it may be reused.
     * @param parser
     */
    void put(Parser parser);
}