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.receiver.zipkin;
  
  import com.linecorp.armeria.common.HttpMethod;
  import java.util.Arrays;
  import org.apache.skywalking.oap.server.core.CoreModule;
  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;
  import org.apache.skywalking.oap.server.library.server.http.HTTPServer;
  import org.apache.skywalking.oap.server.library.server.http.HTTPServerConfig;
  import org.apache.skywalking.oap.server.receiver.zipkin.handler.ZipkinSpanHTTPHandler;
  import org.apache.skywalking.oap.server.receiver.zipkin.kafka.KafkaHandler;
  import org.apache.skywalking.oap.server.telemetry.TelemetryModule;
  
  public class ZipkinReceiverProvider extends ModuleProvider {
      public static final String NAME = "default";
      private ZipkinReceiverConfig config;
      private HTTPServer httpServer;
      private KafkaHandler kafkaHandler;
  
      @Override
      public String name() {
          return NAME;
      }
  
      @Override
      public Class<? extends ModuleDefine> module() {
          return ZipkinReceiverModule.class;
      }
  
      @Override
      public ConfigCreator newConfigCreator() {
          return new ConfigCreator<ZipkinReceiverConfig>() {
              @Override
              public Class type() {
                  return ZipkinReceiverConfig.class;
              }
  
              @Override
              public void onInitialized(final ZipkinReceiverConfig initialized) {
                  config = initialized;
              }
          };
      }
  
      @Override
      public void prepare() throws ServiceNotProvidedException {
      }
  
      @Override
      public void start() throws ServiceNotProvidedException, ModuleStartException {
          if (config.getSampleRate() < 0 || config.getSampleRate() > 10000) {
              throw new IllegalArgumentException(
                  "sampleRate: " + config.getSampleRate() + ", should be between 0 and 10000");
          }
  
          if (config.isEnableHttpCollector()) {
              HTTPServerConfig httpServerConfig = HTTPServerConfig.builder()
                                                                  .host(config.getRestHost())
                                                                  .port(config.getRestPort())
                                                                  .contextPath(config.getRestContextPath())
                                                                  .idleTimeOut(config.getRestIdleTimeOut())
                                                                  .maxThreads(config.getRestMaxThreads())
                                                                  .acceptQueueSize(config.getRestAcceptQueueSize())
                                                                  .build();
  
              httpServer = new HTTPServer(httpServerConfig);
              httpServer.initialize();
  
              httpServer.addHandler(
                  new ZipkinSpanHTTPHandler(config, getManager()),
                  Arrays.asList(HttpMethod.POST, HttpMethod.GET)
              );
          }
  
          if (config.isEnableKafkaCollector()) {
              kafkaHandler = new KafkaHandler(config, getManager());
          }
      }
  
      @Override
      public void notifyAfterCompleted() throws ModuleStartException {
          if (config.isEnableHttpCollector()) {
              httpServer.start();
          }
  
          if (config.isEnableKafkaCollector()) {
              kafkaHandler.start();
          }
      }
  
      @Override
      public String[] requiredModules() {
          return new String[] {
              TelemetryModule.NAME,
              CoreModule.NAME
          };
      }
  }
  