| /** |
| * 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.storm.utils; |
| |
| import java.util.HashMap; |
| import java.util.UUID; |
| |
| /** |
| * This class is used as part of testing Storm. It is used to keep track of "global metrics" in an atomic way. For example, it is used for |
| * doing fine-grained detection of when a local Storm cluster is idle by tracking the number of transferred tuples vs the number of |
| * processed tuples. |
| */ |
| public class RegisteredGlobalState { |
| private static final Object _lock = new Object(); |
| private static HashMap<String, Object> _states = new HashMap<>(); |
| |
| public static Object globalLock() { |
| return _lock; |
| } |
| |
| public static String registerState(Object init) { |
| synchronized (_lock) { |
| String id = UUID.randomUUID().toString(); |
| _states.put(id, init); |
| return id; |
| } |
| } |
| |
| public static void setState(String id, Object init) { |
| synchronized (_lock) { |
| _states.put(id, init); |
| } |
| } |
| |
| public static Object getState(String id) { |
| synchronized (_lock) { |
| return _states.get(id); |
| } |
| } |
| |
| public static void clearState(String id) { |
| synchronized (_lock) { |
| _states.remove(id); |
| } |
| } |
| } |