code: /*
   * 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.skywalking.oap.server.configuration.zookeeper.it;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.configuration.api.ConfigChangeWatcher;
  import org.apache.skywalking.oap.server.configuration.api.ConfigurationModule;
  import org.apache.skywalking.oap.server.configuration.api.DynamicConfigurationService;
  import org.apache.skywalking.oap.server.configuration.api.GroupConfigChangeWatcher;
  import org.apache.skywalking.oap.server.library.module.ModuleDefine;
  import org.apache.skywalking.oap.server.library.module.ModuleProvider;
  import org.apache.skywalking.oap.server.library.module.ServiceNotProvidedException;
  
  @Slf4j
  public class MockZookeeperConfigurationProvider extends ModuleProvider {
      ConfigChangeWatcher watcher;
      GroupConfigChangeWatcher groupWatcher;
  
      @Override
      public String name() {
          return "default";
      }
  
      @Override
      public Class<? extends ModuleDefine> module() {
          return MockZookeeperConfigurationModule.class;
      }
  
      @Override
      public ConfigCreator newConfigCreator() {
          return null;
      }
  
      @Override
      public void prepare() throws ServiceNotProvidedException {
          watcher = new ConfigChangeWatcher(MockZookeeperConfigurationModule.NAME, this, "testKey") {
              private volatile String testValue;
  
              @Override
              public void notify(ConfigChangeEvent value) {
                  log.info("ConfigChangeWatcher.ConfigChangeEvent: {}", value);
                  if (EventType.DELETE.equals(value.getEventType())) {
                      testValue = null;
                  } else {
                      testValue = value.getNewValue();
                  }
              }
  
              @Override
              public String value() {
                  return testValue;
              }
          };
  
          groupWatcher = new GroupConfigChangeWatcher(MockZookeeperConfigurationModule.NAME, this, "testKeyGroup") {
              private Map<String, String> config = new ConcurrentHashMap<>();
  
              @Override
              public void notifyGroup(Map<String , ConfigChangeEvent> groupItems) {
                  log.info("GroupConfigChangeWatcher.ConfigChangeEvents: {}", groupItems);
                  groupItems.forEach((groupItemName , event) -> {
                      if (EventType.DELETE.equals(event.getEventType())) {
                          config.remove(groupItemName);
                      } else {
                          config.put(groupItemName, event.getNewValue());
                      }
                  });
              }
  
              @Override
              public Map<String, String> groupItems() {
                  return config;
              }
          };
      }
  
      @Override
      public void start() throws ServiceNotProvidedException {
          getManager().find(ConfigurationModule.NAME)
                      .provider()
                      .getService(DynamicConfigurationService.class)
                      .registerConfigChangeWatcher(watcher);
  
          getManager().find(ConfigurationModule.NAME)
                      .provider()
                      .getService(DynamicConfigurationService.class)
                      .registerConfigChangeWatcher(groupWatcher);
      }
  
      @Override
      public void notifyAfterCompleted() throws ServiceNotProvidedException {
  
      }
  
      @Override
      public String[] requiredModules() {
          return new String[] {
              ConfigurationModule.NAME
          };
      }
  }
  