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.exporter.provider;
  
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.exporter.ExporterModule;
  import org.apache.skywalking.oap.server.core.exporter.LogExportService;
  import org.apache.skywalking.oap.server.core.exporter.MetricValuesExportService;
  import org.apache.skywalking.oap.server.core.exporter.TraceExportService;
  import org.apache.skywalking.oap.server.exporter.provider.grpc.GRPCMetricsExporter;
  import org.apache.skywalking.oap.server.exporter.provider.kafka.log.KafkaLogExporter;
  import org.apache.skywalking.oap.server.exporter.provider.kafka.trace.KafkaTraceExporter;
  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.ModuleStartException;
  import org.apache.skywalking.oap.server.library.module.ServiceNotProvidedException;
  
  public class ExporterProvider extends ModuleProvider {
      private ExporterSetting setting;
      private GRPCMetricsExporter grpcMetricsExporter;
      private KafkaTraceExporter kafkaTraceExporter;
      private KafkaLogExporter kafkaLogExporter;
  
      @Override
      public String name() {
          return "default";
      }
  
      @Override
      public Class<? extends ModuleDefine> module() {
          return ExporterModule.class;
      }
  
      @Override
      public ConfigCreator newConfigCreator() {
          return new ConfigCreator<ExporterSetting>() {
              @Override
              public Class type() {
                  return ExporterSetting.class;
              }
  
              @Override
              public void onInitialized(final ExporterSetting initialized) {
                  setting = initialized;
              }
          };
      }
  
      @Override
      public void prepare() throws ServiceNotProvidedException, ModuleStartException {
          grpcMetricsExporter = new GRPCMetricsExporter(setting);
          kafkaTraceExporter = new KafkaTraceExporter(getManager(), setting);
          kafkaLogExporter = new KafkaLogExporter(getManager(), setting);
          this.registerServiceImplementation(MetricValuesExportService.class, grpcMetricsExporter);
          this.registerServiceImplementation(TraceExportService.class, kafkaTraceExporter);
          this.registerServiceImplementation(LogExportService.class, kafkaLogExporter);
      }
  
      @Override
      public void start() throws ServiceNotProvidedException, ModuleStartException {
          if (setting.isEnableGRPCMetrics()) {
              grpcMetricsExporter.start();
          }
          if (setting.isEnableKafkaTrace()) {
              kafkaTraceExporter.start();
          }
          if (setting.isEnableKafkaLog()) {
              kafkaLogExporter.start();
          }
      }
  
      @Override
      public void notifyAfterCompleted() throws ServiceNotProvidedException, ModuleStartException {
          if (setting.isEnableGRPCMetrics()) {
              grpcMetricsExporter.fetchSubscriptionList();
          }
      }
  
      @Override
      public String[] requiredModules() {
          return new String[] {CoreModule.NAME};
      }
  }
  