| /* |
| * 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.ambari.server.alerts; |
| |
| import javax.annotation.Nullable; |
| |
| import org.apache.ambari.server.state.AlertState; |
| |
| /** |
| * I'm a 3 level threshold where each level corresponds to ok, warn and critical levels. |
| * The levels are either increasing or decreasing numerical sequences. |
| * My main responsibility is to map incoming values to {@link AlertState} based on the threshold levels. |
| */ |
| public class Threshold { |
| private final Double okValue; |
| private final double warnValue; |
| private final double critValue; |
| |
| public Threshold(@Nullable Double okValue, double warnValue, double critValue) { |
| this.okValue = okValue; |
| this.warnValue = warnValue; |
| this.critValue = critValue; |
| } |
| |
| public AlertState state(double value) { |
| return directionUp() ? stateWhenDirectionUp(value) : stateWhenDirectionDown(value); |
| } |
| |
| private boolean directionUp() { |
| return critValue >= warnValue; |
| } |
| |
| private AlertState stateWhenDirectionUp(double value) { |
| if (value >= critValue) { |
| return AlertState.CRITICAL; |
| } |
| if (value >= warnValue) { |
| return AlertState.WARNING; |
| } |
| if (okValue == null || value >= okValue) { |
| return AlertState.OK; |
| } |
| return AlertState.UNKNOWN; |
| } |
| |
| private AlertState stateWhenDirectionDown(double value) { |
| if (value <= critValue) { |
| return AlertState.CRITICAL; |
| } |
| if (value <= warnValue) { |
| return AlertState.WARNING; |
| } |
| if (okValue == null || value <= okValue) { |
| return AlertState.OK; |
| } |
| return AlertState.UNKNOWN; |
| } |
| } |