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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.yolean.concurrent;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
import java.util.function.Supplier;
/**
* <p>This implements a simple stack based resource pool. If you are out of resources new are allocated from the
* factory.</p>
*
* @author baldersheim
* @since 5.2
*/
public final class ResourcePool<T> implements Iterable<T> {
private final Deque<T> pool = new ArrayDeque<>();
private final Supplier<T> factory;
public ResourcePool(Supplier<T> factory) {
this.factory = factory;
}
public T alloc() {
return pool.isEmpty() ? factory.get() : pool.pop();
}
public void free(T e) {
pool.push(e);
}
@Override
public Iterator<T> iterator() {
return pool.iterator();
}
}
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