Package org.apache.hadoop.hbase.metrics

Source Code of org.apache.hadoop.hbase.metrics.TestExponentiallyDecayingSample

/**
* 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.
*/

package org.apache.hadoop.hbase.metrics;

import junit.framework.Assert;

import org.apache.hadoop.hbase.metrics.histogram.ExponentiallyDecayingSample;
import org.apache.hadoop.hbase.metrics.histogram.Snapshot;
import org.junit.Test;

public class TestExponentiallyDecayingSample {
 
  @Test
  public void testBasic() {
      final ExponentiallyDecayingSample sample =
          new ExponentiallyDecayingSample(100, 0.99);
     
      for (int i = 0; i < 1000; i++) {
          sample.update(i);
      }
      Assert.assertEquals(100, sample.size());
     
      final Snapshot snapshot = sample.getSnapshot();
      Assert.assertEquals(100, snapshot.size());

      for (double i : snapshot.getValues()) {
        Assert.assertTrue(i >= 0.0 && i < 1000.0);
      }
  }

  @Test
  public void testTooBig() throws Exception {
      final ExponentiallyDecayingSample sample =
          new ExponentiallyDecayingSample(100, 0.99);
      for (int i = 0; i < 10; i++) {
          sample.update(i);
      }
      Assert.assertEquals(10, sample.size());

      final Snapshot snapshot = sample.getSnapshot();
      Assert.assertEquals(10, sample.size());

      for (double i : snapshot.getValues()) {
        Assert.assertTrue(i >= 0.0 && i < 1000.0);
      }
  }
}
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