org.apache.activemq.artemis.utils.pools.Pool Maven / Gradle / Ivy
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* 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.activemq.artemis.utils.pools;
import java.util.Queue;
import java.util.function.Consumer;
import java.util.function.Supplier;
/**
* A simple encapsulation to provide a pool of objects.
* @param
*/
public abstract class Pool {
private final Queue internalPool;
private final Consumer cleaner;
private final Supplier supplier;
public Pool(int maxSize, Consumer cleaner, Supplier supplier) {
internalPool = createQueue(maxSize);
this.cleaner = cleaner;
this.supplier = supplier;
}
abstract Queue createQueue(int maxSize);
/** Use this to instantiate or return objects from the pool */
public final T borrow() {
if (internalPool == null) {
return supplier.get();
}
T returnObject = internalPool.poll();
if (returnObject == null) {
returnObject = supplier.get();
} else {
cleaner.accept(returnObject);
}
return returnObject;
}
/** Return objects to the pool, they will be either reused or ignored by the max size */
public final void release(T object) {
if (internalPool != null) {
internalPool.offer(object);
}
}
}
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