common-app-api/src/main/java/org/openecomp/sdc/common/impl/ConfigFileChangeListener.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * SDC
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.openecomp.sdc.common.impl;
  22
  23 import java.io.File;
  24 import java.util.ArrayList;
  25 import java.util.HashMap;
  26 import java.util.List;
  27 import java.util.Map;
  28
  29 import org.apache.commons.jci.listeners.FileChangeListener;
  30 import org.openecomp.sdc.common.api.BasicConfiguration;
  31 import org.openecomp.sdc.common.api.ConfigurationListener;
  32 import org.openecomp.sdc.common.util.YamlToObjectConverter;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35
  36 public class ConfigFileChangeListener extends FileChangeListener {
  37
  38         private static Logger log = LoggerFactory.getLogger(ConfigFileChangeListener.class.getName());
  39
  40         private Map<String, List<ConfigurationListener>> fileChangeToCallBack = new HashMap<String, List<ConfigurationListener>>();
  41
  42         private Object lock = new Object();
  43
  44         private YamlToObjectConverter yamlToObjectConverter = new YamlToObjectConverter();
  45
  46         @Override
  47         public void onFileChange(File pFile) {
  48
  49                 super.onFileChange(pFile);
  50
  51                 if (pFile != null) {
  52
  53                         if (fileChangeToCallBack != null) {
  54
  55                                 String id = findIdFromFileName(pFile.getName());
  56
  57                                 if (id != null) {
  58
  59                                         List<ConfigurationListener> listeners = fileChangeToCallBack.get(id);
  60                                         if (listeners != null) {
  61                                                 for (ConfigurationListener configurationListener : listeners) {
  62
  63                                                         Class<? extends BasicConfiguration> configClass = configurationListener.getType();
  64
  65                                                         BasicConfiguration basicConfiguration = yamlToObjectConverter
  66                                                                         .convert(pFile.getAbsolutePath(), configClass);
  67
  68                                                         if (basicConfiguration == null) {
  69                                                                 log.warn(
  70                                                                                 "Cannot update the listeners for file Change since the file content is invalid");
  71                                                                 continue;
  72                                                         }
  73                                                         log.debug("Loaded configuration after converting is " + basicConfiguration);
  74                                                         // System.out.println("New configuration is " +
  75                                                         // basicConfiguration);
  76
  77                                                         configurationListener.getCallBack().reconfigure(basicConfiguration);
  78
  79                                                 }
  80                                         }
  81                                 } else {
  82
  83                                         log.warn("Cannot calculate id from file " + pFile.getName());
  84                                 }
  85                         }
  86
  87                 }
  88
  89                 log.debug("File {} was changed.", pFile);
  90         }
  91
  92         private String findIdFromFileName(String name) {
  93
  94                 String result = null;
  95                 if (name != null) {
  96                         int startIndex = 0;
  97                         int endIndex = name.length();
  98                         if (name.contains(File.separator)) {
  99                                 startIndex = name.lastIndexOf(File.separator);
 100                         }
 101                         // String subNameString = name.substring(startIndex, endIndex);
 102                         // if (subNameString.contains(".")) {
 103                         // endIndex = subNameString.indexOf(".");
 104                         // }
 105
 106                         result = name.substring(startIndex, endIndex);
 107
 108                 }
 109
 110                 return result;
 111         }
 112
 113         public void register(String id, ConfigurationListener configurationListener) {
 114
 115                 if (configurationListener != null) {
 116
 117                         synchronized (lock) {
 118
 119                                 List<ConfigurationListener> callbacks = fileChangeToCallBack.get(id);
 120                                 if (callbacks == null) {
 121                                         callbacks = new ArrayList<ConfigurationListener>();
 122                                         fileChangeToCallBack.put(id, callbacks);
 123                                 }
 124                                 callbacks.add(configurationListener);
 125
 126                         }
 127
 128                 }
 129
 130         }
 131
 132         // public void notify(String id, BasicConfiguration object) {
 133         //
 134         // if (fileChangeToCallBack != null) {
 135         // List<ConfigurationListener> listeners = fileChangeToCallBack
 136         // .get(id);
 137         // if (listeners != null) {
 138         // for (ConfigurationListener configurationListener : listeners) {
 139         //
 140         // configurationListener.getCallBack().reconfigure(object);
 141         //
 142         // }
 143         // }
 144         // }
 145         //
 146         // }
 147
 148 }