helix-core/src/test/java/org/apache/helix/monitoring/TestStatCollector.java

package org.apache.helix.monitoring;

/*
 * 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.
 */

import org.testng.AssertJUnit;
import org.testng.annotations.Test;

public class TestStatCollector {
  @Test()
  public void testCollectData() {
    StatCollector collector = new StatCollector();

    int nPoints = 100;
    for (int i = 0; i < nPoints; i++) {
      collector.addData(i * 1000);
    }
    AssertJUnit.assertEquals(collector.getNumDataPoints(), nPoints);
    AssertJUnit.assertEquals((long) collector.getMax(), 99000);
    AssertJUnit.assertEquals((long) collector.getTotalSum(), 4950000);
    AssertJUnit.assertEquals((long) collector.getPercentile(40), 39400);
    AssertJUnit.assertEquals((long) collector.getMean(), 49500);
    AssertJUnit.assertEquals((long) collector.getMin(), 0);

    collector.reset();

    AssertJUnit.assertEquals(collector.getNumDataPoints(), 0);
    AssertJUnit.assertEquals((long) collector.getMax(), 0);
    AssertJUnit.assertEquals((long) collector.getTotalSum(), 0);
    AssertJUnit.assertEquals((long) collector.getPercentile(40), 0);
    AssertJUnit.assertEquals((long) collector.getMean(), 0);
    AssertJUnit.assertEquals((long) collector.getMin(), 0);

  }
}