/**
* 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.lucene.gdata.utils;
/**
* Basic interface to be implemented by ObjectPool implementations. Pools should
* provide a constructor with a
* {@link org.apache.lucene.gdata.utils.PoolObjectFactory} as a mandatory
* parameter to create and destory the pooled objects.
*
* @see org.apache.lucene.gdata.utils.PoolObjectFactory
*
* @author Simon Willnauer
* @param <Type> -
* the type of the pooled objects
*
*/
public interface Pool<Type> {
/**
* Return an object from the pool or create one if the pool is empty.
*
* @return - a pooled object
*/
public abstract Type aquire();
/**
* Adds a previously aquired object to the pool. If the pool has already
* been closed or if the pool has already reached his size the released
* object will be destroyed using
* {@link PoolObjectFactory#destroyInstance(Object)} method.
*
* @param type -
* the previously aquired object
*/
public abstract void release(final Type type);
/**
* @return - the defined size of the pool
*/
public abstract int getSize();
/**
* @return - the expire time of the objects in the pool if defined
*/
public abstract long getExpireTime();
/**
* @return <code>true</code> if and only if the pool uses an expire
* mechanismn, otherwith <code>false</code>
*/
public abstract boolean expires();
/**
* releases all pooled objects using
* {@link PoolObjectFactory#destroyInstance(Object)} method. The pool can not
* be reused after this method has been called
*/
public abstract void destroy();
}
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