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Source code
001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.wake.metrics;
020
021import static java.lang.Math.exp;
022
023/**
024 * Default EWMA parameters.
025 */
026public final class EWMAParameters {
027  public static final int INTERVAL = 5;
028  public static final double SECONDS_PER_MINUTE = 60.0;
029  public static final int ONE_MINUTE = 1;
030  public static final double M1_ALPHA = 1 - exp(-INTERVAL / SECONDS_PER_MINUTE / ONE_MINUTE);
031  public static final int FIVE_MINUTES = 5;
032  public static final double M5_ALPHA = 1 - exp(-INTERVAL / SECONDS_PER_MINUTE / FIVE_MINUTES);
033  public static final int FIFTEEN_MINUTES = 15;
034  public static final double M15_ALPHA = 1 - exp(-INTERVAL / SECONDS_PER_MINUTE / FIFTEEN_MINUTES);
035
036  /**
037   * Empty private constructor to prohibit instantiation of utility class.
038   */
039  private EWMAParameters() {
040  }
041}