| package org.apache.helix.view.aggregator; |
| |
| /* |
| * 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 java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import org.apache.helix.PropertyType; |
| import org.apache.helix.api.config.ViewClusterSourceConfig; |
| import org.apache.helix.model.ClusterConfig; |
| |
| /** |
| * This class takes an existing list of source cluster configs and generate lists of source |
| * cluster configs to add / delete / modify, and tell caller if ViewClusterRefreshTimer should |
| * be reset or not |
| */ |
| public class SourceClusterConfigChangeAction { |
| private final List<ViewClusterSourceConfig> _toAdd; |
| private final List<ViewClusterSourceConfig> _toDelete; |
| private final ClusterConfig _oldConfig; |
| private final ClusterConfig _newConfig; |
| |
| private boolean _shouldResetTimer; |
| |
| public SourceClusterConfigChangeAction(ClusterConfig oldConfig, ClusterConfig newConfig) { |
| _oldConfig = oldConfig; |
| _newConfig = newConfig; |
| _shouldResetTimer = false; |
| _toAdd = new ArrayList<>(); |
| _toDelete = new ArrayList<>(); |
| validate(); |
| } |
| |
| private void validate() { |
| StringBuilder allErrs = new StringBuilder(); |
| if (_newConfig == null) { |
| allErrs.append("New config is null;"); |
| } |
| if (_oldConfig != null && !_oldConfig.isViewCluster()) { |
| allErrs.append("Old config is not view cluster config;"); |
| } |
| if (_newConfig != null && !_newConfig.isViewCluster()) { |
| allErrs.append("New config is not view cluster config;"); |
| } |
| if (allErrs.length() > 0) { |
| throw new IllegalArgumentException(allErrs.toString()); |
| } |
| } |
| |
| /** |
| * Compute actions and generate toAdd, toDelete toModify, and refreshPeriodChanged. |
| */ |
| public void computeAction() { |
| _shouldResetTimer = _oldConfig == null || _oldConfig.getViewClusterRefershPeriod() != _newConfig |
| .getViewClusterRefershPeriod(); |
| |
| Map<String, ViewClusterSourceConfig> oldConfigMap = new HashMap<>(); |
| Map<String, ViewClusterSourceConfig> currentConfigMap = new HashMap<>(); |
| |
| if (_oldConfig != null) { |
| for (ViewClusterSourceConfig oldConfig : _oldConfig.getViewClusterSourceConfigs()) { |
| oldConfigMap.put(generateConfigMapKey(oldConfig.getName(), oldConfig.getZkAddress()), oldConfig); |
| } |
| } |
| |
| for (ViewClusterSourceConfig currentConfig : _newConfig.getViewClusterSourceConfigs()) { |
| currentConfigMap.put( |
| generateConfigMapKey(currentConfig.getName(), currentConfig.getZkAddress()), currentConfig); |
| } |
| |
| // Configs whose properties-to-aggregate got modified should have its data provider recreated |
| for (Map.Entry<String, ViewClusterSourceConfig> entry : currentConfigMap.entrySet()) { |
| if (oldConfigMap.containsKey(entry.getKey())) { |
| Set<PropertyType> oldPropertySet = new HashSet<>(oldConfigMap.get(entry.getKey()).getProperties()); |
| Set<PropertyType> currentPropertySet = new HashSet<>(entry.getValue().getProperties()); |
| if (!oldPropertySet.equals(currentPropertySet)) { |
| _toAdd.add(new ViewClusterSourceConfig(entry.getValue())); |
| _toDelete.add(new ViewClusterSourceConfig(oldConfigMap.get(entry.getKey()))); |
| } |
| } |
| } |
| |
| // Generate toDelete. Use deep copy to avoid race conditions |
| Set<String> removedKeys = new HashSet<>(oldConfigMap.keySet()); |
| removedKeys.removeAll(currentConfigMap.keySet()); |
| for (String removedKey : removedKeys) { |
| _toDelete.add(new ViewClusterSourceConfig(oldConfigMap.get(removedKey))); |
| } |
| |
| // Generate toAdd. Use deep copy to avoid race conditions |
| Set<String> addedKeys = new HashSet<>(currentConfigMap.keySet()); |
| addedKeys.removeAll(oldConfigMap.keySet()); |
| for (String addedKey : addedKeys) { |
| _toAdd.add(new ViewClusterSourceConfig(currentConfigMap.get(addedKey))); |
| } |
| } |
| |
| public List<ViewClusterSourceConfig> getConfigsToAdd() { |
| return _toAdd; |
| } |
| |
| public List<ViewClusterSourceConfig> getConfigsToDelete() { |
| return _toDelete; |
| } |
| |
| public boolean shouldResetTimer() { |
| return _shouldResetTimer; |
| } |
| |
| public long getCurrentRefreshPeriodMs() { |
| return _newConfig.getViewClusterRefershPeriod() * 1000; |
| } |
| |
| private String generateConfigMapKey(String clusterName, String zkAddr) { |
| return String.format("%s%s", clusterName, zkAddr); |
| } |
| } |