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.core.alarm.provider.grpc;
  
  import io.grpc.stub.StreamObserver;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.core.alarm.grpc.AlarmMessage;
  import org.apache.skywalking.oap.server.core.alarm.grpc.AlarmServiceGrpc;
  import org.apache.skywalking.oap.server.core.alarm.grpc.Response;
  import org.apache.skywalking.oap.server.library.server.ServerException;
  import org.apache.skywalking.oap.server.library.server.grpc.GRPCHandler;
  import org.apache.skywalking.oap.server.library.server.grpc.GRPCServer;
  
  @Slf4j
  public class AlarmMockReceiver {
      public static void main(String[] args) throws ServerException, InterruptedException {
          GRPCServer server = new GRPCServer("localhost", 9888);
          server.initialize();
          server.addHandler(new MockAlarmHandler());
          server.start();
  
          while (true) {
              Thread.sleep(20000L);
          }
      }
  
      public static class MockAlarmHandler extends AlarmServiceGrpc.AlarmServiceImplBase implements GRPCHandler {
  
          @Override public StreamObserver<AlarmMessage> doAlarm(StreamObserver<Response> responseObserver) {
              return new StreamObserver<AlarmMessage>() {
                  @Override
                  public void onNext(AlarmMessage value) {
                      log.info("received alarm message: {}", value.toString());
                  }
  
                  @Override
                  public void onError(Throwable throwable) {
                      responseObserver.onError(throwable);
                      if (log.isDebugEnabled()) {
                          log.debug("received alarm message error.");
                      }
                  }
  
                  @Override
                  public void onCompleted() {
                      responseObserver.onNext(Response.newBuilder().build());
                      responseObserver.onCompleted();
                      if (log.isDebugEnabled()) {
                          log.debug("received alarm message completed.");
                      }
                  }
              };
          }
      }
  }
  