content: /*
   * 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.bifromq.retain.server;
  
  import org.apache.bifromq.baseenv.EnvProvider;
  import org.apache.bifromq.deliverer.BatchDeliveryCallBuilderFactory;
  import org.apache.bifromq.deliverer.MessageDeliverer;
  import org.apache.bifromq.retain.RPCBluePrint;
  import org.apache.bifromq.retain.server.scheduler.DeleteCallScheduler;
  import org.apache.bifromq.retain.server.scheduler.MatchCallScheduler;
  import org.apache.bifromq.retain.server.scheduler.RetainCallScheduler;
  import org.apache.bifromq.retain.store.gc.RetainStoreGCProcessor;
  import com.google.common.util.concurrent.MoreExecutors;
  import io.micrometer.core.instrument.Metrics;
  import io.micrometer.core.instrument.binder.jvm.ExecutorServiceMetrics;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.LinkedTransferQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  import lombok.extern.slf4j.Slf4j;
  
  @Slf4j
  class RetainServer implements IRetainServer {
      private final RetainService retainService;
      private final ExecutorService rpcExecutor;
  
      RetainServer(RetainServerBuilder builder) {
          this.retainService = new RetainService(
              new RetainStoreGCProcessor(builder.retainStoreClient, null),
              new MessageDeliverer(new BatchDeliveryCallBuilderFactory(builder.distClient, builder.subBrokerManager)),
              new MatchCallScheduler(builder.retainStoreClient, builder.settingProvider),
              new RetainCallScheduler(builder.retainStoreClient),
              new DeleteCallScheduler(builder.retainStoreClient));
          if (builder.workerThreads == 0) {
              rpcExecutor = MoreExecutors.newDirectExecutorService();
          } else {
              rpcExecutor = ExecutorServiceMetrics.monitor(Metrics.globalRegistry,
                  new ThreadPoolExecutor(builder.workerThreads,
                      builder.workerThreads, 0L,
                      TimeUnit.MILLISECONDS, new LinkedTransferQueue<>(),
                      EnvProvider.INSTANCE.newThreadFactory("retain-server-executor")), "retain-server-executor");
          }
          builder.rpcServerBuilder.bindService(retainService.bindService(),
              RPCBluePrint.INSTANCE,
              builder.attributes,
              builder.defaultGroupTags,
              rpcExecutor);
      }
  
      @Override
      public void close() {
          log.info("Stopping RetainService");
          retainService.close();
          MoreExecutors.shutdownAndAwaitTermination(rpcExecutor, 5, TimeUnit.SECONDS);
          log.debug("RetainService stopped");
      }
  }
  