ReleasablesTests.java example

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 * the Apache License, Version 2.0 (the "License"); you may
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 *
 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.common;

import org.elasticsearch.common.lease.Releasable;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.test.ESTestCase;

import java.util.concurrent.atomic.AtomicInteger;

public class ReleasablesTests extends ESTestCase {

    public void testReleaseOnce() {
        AtomicInteger count = new AtomicInteger(0);
        Releasable releasable = Releasables.releaseOnce(count::incrementAndGet, count::incrementAndGet);
        assertEquals(0, count.get());
        releasable.close();
        assertEquals(2, count.get());
        releasable.close();
        assertEquals(2, count.get());
    }
}