/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.impl.async;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.nio.AsyncPushConsumer;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.reactor.ConnectionInitiator;
  import org.apache.hc.core5.reactor.DefaultConnectingIOReactor;
  import org.apache.hc.core5.reactor.IOReactorStatus;
  import org.apache.hc.core5.util.TimeValue;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  abstract class AbstractHttpAsyncClientBase extends CloseableHttpAsyncClient {
  
      enum Status { READY, RUNNING, TERMINATED }
  
      private static final Logger LOG = LoggerFactory.getLogger(AbstractHttpAsyncClientBase.class);
  
      private final AsyncPushConsumerRegistry pushConsumerRegistry;
      private final DefaultConnectingIOReactor ioReactor;
      private final ExecutorService executorService;
      private final AtomicReference<Status> status;
  
      AbstractHttpAsyncClientBase(
              final DefaultConnectingIOReactor ioReactor,
              final AsyncPushConsumerRegistry pushConsumerRegistry,
              final ThreadFactory threadFactory) {
          super();
          this.ioReactor = ioReactor;
          this.pushConsumerRegistry = pushConsumerRegistry;
          this.executorService = Executors.newSingleThreadExecutor(threadFactory);
          this.status = new AtomicReference<>(Status.READY);
      }
  
      @Override
      public final void start() {
          if (status.compareAndSet(Status.READY, Status.RUNNING)) {
              executorService.execute(new Runnable() {
  
                  @Override
                  public void run() {
                      ioReactor.start();
                  }
              });
          }
      }
  
      @Override
      public void register(final String hostname, final String uriPattern, final Supplier<AsyncPushConsumer> supplier) {
          pushConsumerRegistry.register(hostname, uriPattern, supplier);
      }
  
      boolean isRunning() {
          return status.get() == Status.RUNNING;
      }
  
      ConnectionInitiator getConnectionInitiator() {
          return ioReactor;
      }
  
      @Override
      public final IOReactorStatus getStatus() {
          return ioReactor.getStatus();
      }
  
      @Override
      public final void awaitShutdown(final TimeValue waitTime) throws InterruptedException {
          ioReactor.awaitShutdown(waitTime);
     }
 
     @Override
     public final void initiateShutdown() {
         if (LOG.isDebugEnabled()) {
             LOG.debug("Initiating shutdown");
         }
         ioReactor.initiateShutdown();
     }
 
     void internalClose(final CloseMode closeMode) {
     }
 
     @Override
     public final void close(final CloseMode closeMode) {
         if (LOG.isDebugEnabled()) {
             LOG.debug("Shutdown {}", closeMode);
         }
         ioReactor.initiateShutdown();
         ioReactor.close(closeMode);
         executorService.shutdownNow();
         internalClose(closeMode);
     }
 
     @Override
     public void close() {
         close(CloseMode.GRACEFUL);
     }
 
 }