| package org.apache.helix.task; |
| |
| /* |
| * 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.HelixManager; |
| import org.apache.helix.controller.dataproviders.WorkflowControllerDataProvider; |
| import org.apache.helix.controller.rebalancer.Rebalancer; |
| import org.apache.helix.controller.rebalancer.internal.MappingCalculator; |
| import org.apache.helix.controller.stages.CurrentStateOutput; |
| import org.apache.helix.model.IdealState; |
| import org.apache.helix.model.Resource; |
| import org.apache.helix.model.ResourceAssignment; |
| |
| /** |
| * Abstract rebalancer class for the {@code Task} state model. |
| */ |
| public abstract class TaskRebalancer extends AbstractTaskDispatcher |
| implements Rebalancer<WorkflowControllerDataProvider>, |
| MappingCalculator<WorkflowControllerDataProvider> { |
| |
| @Override |
| public void init(HelixManager manager) { |
| _manager = manager; |
| } |
| |
| @Override |
| public abstract ResourceAssignment computeBestPossiblePartitionState(WorkflowControllerDataProvider clusterData, |
| IdealState taskIs, Resource resource, CurrentStateOutput currStateOutput); |
| |
| |
| |
| @Override |
| public IdealState computeNewIdealState(String resourceName, IdealState currentIdealState, |
| CurrentStateOutput currentStateOutput, WorkflowControllerDataProvider clusterData) { |
| // All of the heavy lifting is in the ResourceAssignment computation, |
| // so this part can just be a no-op. |
| return currentIdealState; |
| } |
| |
| } |