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.grpc;
  
  import io.grpc.ManagedChannel;
  import io.grpc.Server;
  import io.grpc.inprocess.InProcessChannelBuilder;
  import io.grpc.inprocess.InProcessServerBuilder;
  import io.grpc.util.MutableHandlerRegistry;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.configuration.api.ConfigChangeWatcher;
  import org.apache.skywalking.oap.server.configuration.api.GroupConfigChangeWatcher;
  import org.apache.skywalking.oap.server.configuration.service.ConfigurationServiceGrpc;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  import org.powermock.reflect.Whitebox;
  
  import java.io.IOException;
  import java.util.Map;
  import java.util.UUID;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  @Slf4j
  public class GRPCConfigurationTest {
      private GRPCConfigurationProvider provider;
      private GRPCConfigWatcherRegister register;
      private ConfigChangeWatcher singleWatcher;
      private GroupConfigChangeWatcher groupWatcher;
  
      private Server server;
      private ManagedChannel channel;
      private MutableHandlerRegistry serviceRegistry;
  
      @BeforeEach
      public void before() throws IOException {
          serviceRegistry = new MutableHandlerRegistry();
          final String name = UUID.randomUUID().toString();
          InProcessServerBuilder serverBuilder =
                  InProcessServerBuilder
                          .forName(name)
                          .fallbackHandlerRegistry(serviceRegistry);
  
          server = serverBuilder.build();
          server.start();
  
          channel = InProcessChannelBuilder.forName(name).build();
  
          RemoteEndpointSettings settings = new RemoteEndpointSettings();
          settings.setHost("localhost");
          settings.setPort(5678);
          settings.setPeriod(1);
          provider = new GRPCConfigurationProvider();
          register = new GRPCConfigWatcherRegister(settings);
          ConfigurationServiceGrpc.ConfigurationServiceBlockingStub blockingStub = ConfigurationServiceGrpc.newBlockingStub(channel);
          Whitebox.setInternalState(register, "stub", blockingStub);
          initWatcher();
          assertNotNull(provider);
      }
  
      @AfterEach
      public void after() {
          channel.shutdown();
          server.shutdown();
  
          try {
              channel.awaitTermination(1L, TimeUnit.MINUTES);
              server.awaitTermination(1L, TimeUnit.MINUTES);
          } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
              throw new RuntimeException(e);
          } finally {
              channel.shutdownNow();
              channel = null;
              server.shutdownNow();
              server = null;
          }
      }
  
      @Test
      @Timeout(20)
      public void shouldReadUpdated() throws Exception {
          AtomicInteger dataFlag = new AtomicInteger(0);
          serviceRegistry.addService(new MockGRPCConfigService(dataFlag));
          assertNull(singleWatcher.value());
          register.registerConfigChangeWatcher(singleWatcher);
          register.start();
  
          for (String v = singleWatcher.value(); v == null; v = singleWatcher.value()) {
          }
          assertEquals("100", singleWatcher.value());
          //change
          dataFlag.set(1);
          TimeUnit.SECONDS.sleep(1);
          for (String v = singleWatcher.value(); v.equals("100"); v = singleWatcher.value()) {
          }
          assertEquals("300", singleWatcher.value());
          //no change
          dataFlag.set(2);
          TimeUnit.SECONDS.sleep(3);
          for (String v = singleWatcher.value(); !v.equals("300"); v = singleWatcher.value()) {
          }
          assertEquals("300", singleWatcher.value());
          //delete
          dataFlag.set(3);
          TimeUnit.SECONDS.sleep(1);
          for (String v = singleWatcher.value(); v.equals("300"); v = singleWatcher.value()) {
          }
          assertEquals("", singleWatcher.value());
      }
  
      @Test
      @Timeout(20)
      public void shouldReadUpdated4Group() throws Exception {
          AtomicInteger dataFlag = new AtomicInteger(0);
          serviceRegistry.addService(new MockGRPCConfigService(dataFlag));
          assertEquals("{}", groupWatcher.groupItems().toString());
          register.registerConfigChangeWatcher(groupWatcher);
          register.start();
  
          for (String v = groupWatcher.groupItems().get("item1");
              v == null;
              v = groupWatcher.groupItems().get("item1")) {
          }
          assertEquals("100", groupWatcher.groupItems().get("item1"));
          for (String v = groupWatcher.groupItems().get("item2");
              v == null;
              v = groupWatcher.groupItems().get("item2")) {
          }
          assertEquals("200", groupWatcher.groupItems().get("item2"));
          //change item2
          dataFlag.set(1);
          TimeUnit.SECONDS.sleep(1);
          for (String v = groupWatcher.groupItems().get("item2");
              v.equals("200");
              v = groupWatcher.groupItems().get("item2")) {
          }
          assertEquals("2000", groupWatcher.groupItems().get("item2"));
          //no change
          dataFlag.set(2);
          TimeUnit.SECONDS.sleep(3);
          assertEquals("100", groupWatcher.groupItems().get("item1"));
          assertEquals("2000", groupWatcher.groupItems().get("item2"));
          //delete item1
          dataFlag.set(3);
          TimeUnit.SECONDS.sleep(1);
          for (String v = groupWatcher.groupItems().get("item1");
              v != null;
              v = groupWatcher.groupItems().get("item1")) {
          }
          assertNull(groupWatcher.groupItems().get("item1"));
      }
  
      private void initWatcher() {
          singleWatcher = new ConfigChangeWatcher("test-module", provider, "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("test-module", provider, "testKeyGroup") {
              private final 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;
              }
          };
      }
  }
  