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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.collections;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
/**
* <p>This implements a simple stack based resource pool. If you are out of resources new are allocated from the
* factory.</p>
*
* @author baldersheim
* TODO: remove on vespa 7 or before
* Use com.yahoo.yolean.concurrent.ResourceFactory instead.
*/
@Deprecated
public final class ResourcePool<T> implements Iterable<T> {
private final Deque<T> pool = new ArrayDeque<>();
private final ResourceFactory<T> factory;
public ResourcePool(ResourceFactory<T> factory) {
this.factory = factory;
}
public final T alloc() {
return pool.isEmpty() ? factory.create() : pool.pop();
}
public final void free(T e) {
pool.push(e);
}
@Override
public Iterator<T> iterator() {
return pool.iterator();
}
}
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