/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.threadpool;

import org.elasticsearch.test.ESTestCase;

import static org.hamcrest.CoreMatchers.equalTo;

public class ThreadPoolTests extends ESTestCase {

    public void testBoundedByBelowMin() {
        int min = randomIntBetween(0, 32);
        int max = randomIntBetween(min + 1, 64);
        int value = randomIntBetween(Integer.MIN_VALUE, min - 1);
        assertThat(ThreadPool.boundedBy(value, min, max), equalTo(min));
    }

    public void testBoundedByAboveMax() {
        int min = randomIntBetween(0, 32);
        int max = randomIntBetween(min + 1, 64);
        int value = randomIntBetween(max + 1, Integer.MAX_VALUE);
        assertThat(ThreadPool.boundedBy(value, min, max), equalTo(max));
    }

    public void testBoundedByBetweenMinAndMax() {
        int min = randomIntBetween(0, 32);
        int max = randomIntBetween(min + 1, 64);
        int value = randomIntBetween(min, max);
        assertThat(ThreadPool.boundedBy(value, min, max), equalTo(value));
    }

    public void testAbsoluteTime() throws Exception {
        TestThreadPool threadPool = new TestThreadPool("test");
        try {
            long currentTime = System.currentTimeMillis();
            long gotTime = threadPool.absoluteTimeInMillis();
            long delta = Math.abs(gotTime - currentTime);
            assertTrue("thread pool cached absolute time " + gotTime + " is too far from real current time " + currentTime,
                delta < 10000); // the delta can be large, we just care it is the same order of magnitude
        } finally {
            threadPool.shutdown();
            threadPool.close();
        }
    }
}
