content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.example;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.naming.NamingFactory;
  import com.alibaba.nacos.api.naming.NamingService;
  import com.alibaba.nacos.api.naming.listener.FuzzyWatchChangeEvent;
  import com.alibaba.nacos.api.naming.listener.FuzzyWatchEventWatcher;
  import com.alibaba.nacos.api.naming.utils.NamingUtils;
  
  import java.util.Properties;
  import java.util.concurrent.Executor;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  
  import static com.alibaba.nacos.api.common.Constants.DEFAULT_GROUP;
  
  /**
   * Nacos naming fuzzy watch example.
   * <p>Add the JVM parameter to run the NamingExample:</p>
   * {@code -DserverAddr=${nacos.server.ip}:${nacos.server.port} -Dnamespace=${namespaceId}}
   *
   * @author tanyongquan
   */
  public class NamingFuzzyWatchExample {
      
      public static void main(String[] args) throws NacosException, InterruptedException {
          
          Properties properties = new Properties();
          properties.setProperty("serverAddr", System.getProperty("serverAddr", "localhost"));
          properties.setProperty("namespace", System.getProperty("namespace", "public"));
          
          NamingService naming = NamingFactory.createNamingService(properties);
          
          int num = 5;
          for (int i = 1; i <= num; i++) {
              String s = "nacos.test." + i;
              naming.registerInstance(s, "11.11.11.11", 8888);
          }
          
          System.out.println(num + " instance have been registered");
          
          Executor executor = new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(),
                  runnable -> {
                      Thread thread = new Thread(runnable);
                      thread.setName("test-thread");
                      return thread;
                  });
          
          naming.fuzzyWatch(DEFAULT_GROUP, new FuzzyWatchEventWatcher() {
              
              //EventListener onEvent is sync to handle, If process too low in onEvent, maybe block other onEvent callback.
              //So you can override getExecutor() to async handle event.
              @Override
              public Executor getExecutor() {
                  return executor;
              }
              
              @Override
              public void onEvent(FuzzyWatchChangeEvent event) {
                  System.out.println(
                          "[Fuzzy-Watch-GROUP]changed service name: " + NamingUtils.getServiceKey(event.getNamespace(),
                                  event.getGroupName(), event.getServiceName()));
                  System.out.println("[Fuzzy-Watch-GROUP]change type: " + event.getChangeType());
              }
          });
          
          naming.fuzzyWatch("nacos.test.*", DEFAULT_GROUP, new FuzzyWatchEventWatcher() {
              
              @Override
              public Executor getExecutor() {
                  return executor;
              }
              
              @Override
              public void onEvent(FuzzyWatchChangeEvent event) {
                  System.out.println(
                          "[Prefix-Fuzzy-Watch]changed service name: " + NamingUtils.getServiceKey(event.getNamespace(),
                                  event.getGroupName(), event.getServiceName()));
                  System.out.println("[Prefix-Fuzzy-Watch]change type: " + event.getChangeType());
              }
          });
          
          naming.registerInstance("nacos.test.-1", "11.11.11.11", 8888);
          
          Thread.sleep(1000);
          
          naming.registerInstance("nacos.OTHER-PREFIX", "11.11.11.11", 8888);
          
          Thread.sleep(1000);
          
          naming.registerInstance("nacos.OTHER-GROUP", "OTHER-GROUP", "11.11.11.11", 8888);
          
          Thread.sleep(1000);
          
          for (int i = 1; i <= num; i++) {
              String s = "nacos.test." + i;
              naming.deregisterInstance(s, "11.11.11.11", 8888);
          }
          
          Thread.sleep(1000);
          
      }
  }
  