| /** |
| * 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.hadoop.conf; |
| |
| import java.util.Map; |
| import java.util.Collection; |
| import java.util.HashMap; |
| |
| public class ReconfigurationUtil { |
| |
| public static class PropertyChange { |
| public String prop; |
| public String oldVal; |
| public String newVal; |
| |
| public PropertyChange(String prop, String newVal, String oldVal) { |
| this.prop = prop; |
| this.newVal = newVal; |
| this.oldVal = oldVal; |
| } |
| } |
| |
| public static Collection<PropertyChange> |
| getChangedProperties(Configuration newConf, Configuration oldConf) { |
| Map<String, PropertyChange> changes = new HashMap<String, PropertyChange>(); |
| |
| // iterate over old configuration |
| for (Map.Entry<String, String> oldEntry: oldConf) { |
| String prop = oldEntry.getKey(); |
| String oldVal = oldEntry.getValue(); |
| String newVal = newConf.getRaw(prop); |
| |
| if (newVal == null || !newVal.equals(oldVal)) { |
| changes.put(prop, new PropertyChange(prop, newVal, oldVal)); |
| } |
| } |
| |
| // now iterate over new configuration |
| // (to look for properties not present in old conf) |
| for (Map.Entry<String, String> newEntry: newConf) { |
| String prop = newEntry.getKey(); |
| String newVal = newEntry.getValue(); |
| if (oldConf.get(prop) == null) { |
| changes.put(prop, new PropertyChange(prop, newVal, null)); |
| } |
| } |
| |
| return changes.values(); |
| } |
| |
| public Collection<PropertyChange> parseChangedProperties( |
| Configuration newConf, Configuration oldConf) { |
| return getChangedProperties(newConf, oldConf); |
| } |
| } |