/*
* 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.jena.atlas.lib;
import java.util.ArrayDeque ;
/** A Pool of objects. Base implements a non-blocking pool (returns null on no entry)
* with infinite upper bound. Set effective size by creating the right number of
* entries when created.
*/
public class PoolBase<T> implements Pool<T>
{
// For convenience we operate a LIFO policy.
// This not part of the extenal contract of a "pool"
ArrayDeque<T> pool = new ArrayDeque<>();
int maxSize = -1 ; // Unbounded
public PoolBase() {}
//public Pool(int maxSize) { this.maxSize = maxSize ; }
@Override
public void put(T item)
{
// Currently, unbounded
if ( maxSize >= 0 && pool.size() == 0 )
{}
pool.push(item) ;
}
/** Get an item from the pool - return null if the pool is empty */
@Override
public T get()
{
if ( pool.size() == 0 ) return null ;
return pool.pop();
}
@Override
public boolean isEmpty() { return pool.size() == 0 ; }
}