/**
  * Build the {@link RestClient} used for reindexing from remote clusters.
  *
  * @param remoteInfo connection information for the remote cluster
  * @param taskId the id of the current task. This is added to the thread name for easier tracking
  * @param threadCollector a list in which we collect all the threads created by the client
  */
 static RestClient buildRestClient(
     RemoteInfo remoteInfo, long taskId, List<Thread> threadCollector) {
   Header[] clientHeaders = new Header[remoteInfo.getHeaders().size()];
   int i = 0;
   for (Map.Entry<String, String> header : remoteInfo.getHeaders().entrySet()) {
     clientHeaders[i] = new BasicHeader(header.getKey(), header.getValue());
   }
   return RestClient.builder(
           new HttpHost(remoteInfo.getHost(), remoteInfo.getPort(), remoteInfo.getScheme()))
       .setDefaultHeaders(clientHeaders)
       .setHttpClientConfigCallback(
           c -> {
             // Enable basic auth if it is configured
             if (remoteInfo.getUsername() != null) {
               UsernamePasswordCredentials creds =
                   new UsernamePasswordCredentials(
                       remoteInfo.getUsername(), remoteInfo.getPassword());
               CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
               credentialsProvider.setCredentials(AuthScope.ANY, creds);
               c.setDefaultCredentialsProvider(credentialsProvider);
             }
             // Stick the task id in the thread name so we can track down tasks from stack traces
             AtomicInteger threads = new AtomicInteger();
             c.setThreadFactory(
                 r -> {
                   String name = "es-client-" + taskId + "-" + threads.getAndIncrement();
                   Thread t = new Thread(r, name);
                   threadCollector.add(t);
                   return t;
                 });
             // Limit ourselves to one reactor thread because for now the search process is single
             // threaded.
             c.setDefaultIOReactorConfig(IOReactorConfig.custom().setIoThreadCount(1).build());
             return c;
           })
       .build();
 }
  /**
   * Initialize the transport sender, and execute reactor in new separate thread
   *
   * @param cfgCtx the Axis2 configuration context
   * @param transportOut the description of the http/s transport from Axis2 configuration
   * @throws AxisFault thrown on an error
   */
  public void init(ConfigurationContext cfgCtx, TransportOutDescription transportOut)
      throws AxisFault {
    this.configurationContext = cfgCtx;

    cfg = NHttpConfiguration.getInstance();
    params = new BasicHttpParams();
    params
        .setIntParameter(
            CoreConnectionPNames.SO_TIMEOUT,
            cfg.getProperty(NhttpConstants.SO_TIMEOUT_SENDER, 60000))
        .setIntParameter(
            CoreConnectionPNames.CONNECTION_TIMEOUT,
            cfg.getProperty(CoreConnectionPNames.CONNECTION_TIMEOUT, 10000))
        .setIntParameter(
            CoreConnectionPNames.SOCKET_BUFFER_SIZE,
            cfg.getProperty(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 8 * 1024))
        .setParameter(CoreProtocolPNames.USER_AGENT, "Synapse-HttpComponents-NIO");
    //                .setParameter(CoreProtocolPNames.HTTP_ELEMENT_CHARSET,
    //
    // cfg.getStringValue(CoreProtocolPNames.HTTP_ELEMENT_CHARSET,HTTP.DEFAULT_PROTOCOL_CHARSET));
    // //TODO:This does not works with HTTPCore 4.3

    name = transportOut.getName().toUpperCase(Locale.US) + " Sender";

    ClientConnFactoryBuilder contextBuilder = initConnFactoryBuilder(transportOut);
    connFactory = contextBuilder.createConnFactory(params);

    connpool = new ConnectionPool();

    proxyConfig = new ProxyConfigBuilder().build(transportOut);
    log.info(proxyConfig.logProxyConfig());

    Parameter param = transportOut.getParameter("warnOnHTTP500");
    if (param != null) {
      String[] warnOnHttp500 = ((String) param.getValue()).split("\\|");
      cfgCtx.setNonReplicableProperty("warnOnHTTP500", warnOnHttp500);
    }

    IOReactorConfig ioReactorConfig = new IOReactorConfig();
    ioReactorConfig.setIoThreadCount(NHttpConfiguration.getInstance().getClientIOWorkers());
    ioReactorConfig.setSoTimeout(cfg.getProperty(NhttpConstants.SO_TIMEOUT_RECEIVER, 60000));
    ioReactorConfig.setConnectTimeout(
        cfg.getProperty(CoreConnectionPNames.CONNECTION_TIMEOUT, 10000));
    ioReactorConfig.setTcpNoDelay(cfg.getProperty(CoreConnectionPNames.TCP_NODELAY, 1) == 1);
    if (cfg.getBooleanValue("http.nio.interest-ops-queueing", false)) {
      ioReactorConfig.setInterestOpQueued(true);
    }

    try {
      String prefix = name + " I/O dispatcher";
      ioReactor =
          new DefaultConnectingIOReactor(
              ioReactorConfig,
              new NativeThreadFactory(new ThreadGroup(prefix + " thread group"), prefix));
      ioReactor.setExceptionHandler(
          new IOReactorExceptionHandler() {
            public boolean handle(IOException ioException) {
              log.warn(
                  "System may be unstable: IOReactor encountered a checked exception : "
                      + ioException.getMessage(),
                  ioException);
              return true;
            }

            public boolean handle(RuntimeException runtimeException) {
              log.warn(
                  "System may be unstable: IOReactor encountered a runtime exception : "
                      + runtimeException.getMessage(),
                  runtimeException);
              return true;
            }
          });
    } catch (IOException e) {
      log.error("Error starting the IOReactor", e);
      throw new AxisFault(e.getMessage(), e);
    }

    metrics = new NhttpMetricsCollector(false, transportOut.getName());
    handler = new ClientHandler(connpool, connFactory, proxyConfig, cfgCtx, params, metrics);
    iodispatch = new ClientIODispatch(handler, connFactory);
    final IOEventDispatch ioEventDispatch = iodispatch;

    // start the Sender in a new seperate thread
    Thread t =
        new Thread(
            new Runnable() {
              public void run() {
                try {
                  ioReactor.execute(ioEventDispatch);
                } catch (InterruptedIOException ex) {
                  log.fatal("Reactor Interrupted");
                } catch (IOException e) {
                  log.fatal("Encountered an I/O error: " + e.getMessage(), e);
                }
                log.info(name + " Shutdown");
              }
            },
            "HttpCoreNIOSender");
    t.start();
    log.info(name + " starting");

    // register with JMX
    mbeanSupport = new TransportMBeanSupport(this, "nio-" + transportOut.getName());
    mbeanSupport.register();

    state = BaseConstants.STARTED;
  }