| package org.apache.helix.controller.rebalancer.waged; |
| |
| /* |
| * 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.apache.helix.controller.dataproviders.BaseControllerDataProvider; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * A placeholder before we have the Cluster Data Detector implemented. |
| * |
| * @param <T> The cache class that can be handled by the detector. |
| */ |
| public class ClusterDataDetector<T extends BaseControllerDataProvider> { |
| /** |
| * All the cluster change type that may trigger a WAGED rebalancer re-calculation. |
| */ |
| public enum ChangeType { |
| InstanceConfigChange, |
| ClusterConfigChange, |
| ResourceConfigChange, |
| InstanceStateChange, |
| ResourceIdealStatesChange, |
| OtherChange |
| } |
| |
| private Map<ChangeType, Set<String>> _currentChanges = |
| Collections.singletonMap(ChangeType.ClusterConfigChange, Collections.emptySet()); |
| |
| public void updateClusterStatus(T cache) { |
| } |
| |
| /** |
| * Returns all change types detected during the ClusterDetection stage. |
| */ |
| public Set<ChangeType> getChangeTypes() { |
| return _currentChanges.keySet(); |
| } |
| |
| /** |
| * Returns a set of the names of components that changed based on the given change type. |
| */ |
| public Set<String> getChangesBasedOnType(ChangeType changeType) { |
| return _currentChanges.get(changeType); |
| } |
| |
| /** |
| * Return a map of the change details <type, change details>. |
| */ |
| public Map<ChangeType, Set<String>> getAllChanges() { |
| return _currentChanges; |
| } |
| } |