org.apache.http.impl.client.HttpClientBuilder#setConnectionReuseStrategy()源码实例Demo

public CloseableHttpClient createHttpClient(HttpClientConnectionManager httpClientConnectionManager,
                                         RaptorHttpClientProperties httpClientProperties) {

    RequestConfig defaultRequestConfig = RequestConfig.custom()
            .setConnectTimeout(httpClientProperties.getConnectionTimeout())
            .setSocketTimeout(httpClientProperties.getReadTimeout())
            .setRedirectsEnabled(httpClientProperties.isFollowRedirects())
            .build();

    HttpRequestRetryHandler retryHandler = new DefaultHttpRequestRetryHandler(httpClientProperties.getRetryCount(),
            httpClientProperties.isRequestSentRetryEnabled());
    HttpClientBuilder httpClientBuilder = HttpClientBuilder.create().disableContentCompression()
            .disableCookieManagement()
            .useSystemProperties()
            .setRetryHandler(retryHandler)
            .setConnectionManager(httpClientConnectionManager)
            .setDefaultRequestConfig(defaultRequestConfig);

    if(!keepAlive){
        httpClientBuilder.setConnectionReuseStrategy(NoConnectionReuseStrategy.INSTANCE);
    }

    return httpClientBuilder.build();
}
 

/**
 * @param proxy    Proxy configuration
 * @param listener Log listener
 * @param prompt   Prompt for proxy credentials
 * @return Builder for HTTP client
 */
public HttpClientBuilder build(final Proxy proxy, final TranscriptListener listener, final LoginCallback prompt) {
    final HttpClientBuilder configuration = HttpClients.custom();
    // Use HTTP Connect proxy implementation provided here instead of
    // relying on internal proxy support in socket factory
    switch(proxy.getType()) {
        case HTTP:
        case HTTPS:
            final HttpHost h = new HttpHost(proxy.getHostname(), proxy.getPort(), Scheme.http.name());
            if(log.isInfoEnabled()) {
                log.info(String.format("Setup proxy %s", h));
            }
            configuration.setProxy(h);
            configuration.setProxyAuthenticationStrategy(new CallbackProxyAuthenticationStrategy(ProxyCredentialsStoreFactory.get(), host, prompt));
            break;
    }
    configuration.setUserAgent(new PreferencesUseragentProvider().get());
    final int timeout = preferences.getInteger("connection.timeout.seconds") * 1000;
    configuration.setDefaultSocketConfig(SocketConfig.custom()
        .setTcpNoDelay(true)
        .setSoTimeout(timeout)
        .build());
    configuration.setDefaultRequestConfig(this.createRequestConfig(timeout));
    configuration.setDefaultConnectionConfig(ConnectionConfig.custom()
        .setBufferSize(preferences.getInteger("http.socket.buffer"))
        .setCharset(Charset.forName(host.getEncoding()))
        .build());
    if(preferences.getBoolean("http.connections.reuse")) {
        configuration.setConnectionReuseStrategy(new DefaultClientConnectionReuseStrategy());
    }
    else {
        configuration.setConnectionReuseStrategy(new NoConnectionReuseStrategy());
    }
    configuration.setRetryHandler(new ExtendedHttpRequestRetryHandler(preferences.getInteger("http.connections.retry")));
    configuration.setServiceUnavailableRetryStrategy(new DisabledServiceUnavailableRetryStrategy());
    if(!preferences.getBoolean("http.compression.enable")) {
        configuration.disableContentCompression();
    }
    configuration.setRequestExecutor(new LoggingHttpRequestExecutor(listener));
    // Always register HTTP for possible use with proxy. Contains a number of protocol properties such as the
    // default port and the socket factory to be used to create the java.net.Socket instances for the given protocol
    configuration.setConnectionManager(this.createConnectionManager(this.createRegistry()));
    configuration.setDefaultAuthSchemeRegistry(RegistryBuilder.<AuthSchemeProvider>create()
        .register(AuthSchemes.BASIC, new BasicSchemeFactory(
            Charset.forName(preferences.getProperty("http.credentials.charset"))))
        .register(AuthSchemes.DIGEST, new DigestSchemeFactory(
            Charset.forName(preferences.getProperty("http.credentials.charset"))))
        .register(AuthSchemes.NTLM, preferences.getBoolean("webdav.ntlm.windows.authentication.enable") && WinHttpClients.isWinAuthAvailable() ?
            new BackportWindowsNTLMSchemeFactory(null) :
            new NTLMSchemeFactory())
        .register(AuthSchemes.SPNEGO, preferences.getBoolean("webdav.ntlm.windows.authentication.enable") && WinHttpClients.isWinAuthAvailable() ?
            new BackportWindowsNegotiateSchemeFactory(null) :
            new SPNegoSchemeFactory())
        .register(AuthSchemes.KERBEROS, new KerberosSchemeFactory()).build());
    return configuration;
}
 

@Override
public HttpClient createHttpClient(FilterConfig filterConfig) {
  final String serviceRole = filterConfig.getInitParameter(PARAMETER_SERVICE_ROLE);
  HttpClientBuilder builder;
  GatewayConfig gatewayConfig = (GatewayConfig) filterConfig.getServletContext().getAttribute(GatewayConfig.GATEWAY_CONFIG_ATTRIBUTE);
  GatewayServices services = (GatewayServices) filterConfig.getServletContext()
      .getAttribute(GatewayServices.GATEWAY_SERVICES_ATTRIBUTE);
  if (gatewayConfig != null && gatewayConfig.isMetricsEnabled()) {
    MetricsService metricsService = services.getService(ServiceType.METRICS_SERVICE);
    builder = metricsService.getInstrumented(HttpClientBuilder.class);
  } else {
    builder = HttpClients.custom();
  }

  // Conditionally set a custom SSLContext
  SSLContext sslContext = createSSLContext(services, filterConfig, serviceRole);
  if(sslContext != null) {
    builder.setSSLSocketFactory(new SSLConnectionSocketFactory(sslContext));
  }

  if (Boolean.parseBoolean(System.getProperty(GatewayConfig.HADOOP_KERBEROS_SECURED))) {
    CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY, new UseJaasCredentials());

    Registry<AuthSchemeProvider> authSchemeRegistry = RegistryBuilder.<AuthSchemeProvider>create()
        .register(AuthSchemes.SPNEGO, new KnoxSpnegoAuthSchemeFactory(true))
        .build();

    builder.setDefaultAuthSchemeRegistry(authSchemeRegistry)
        .setDefaultCookieStore(new HadoopAuthCookieStore(gatewayConfig))
        .setDefaultCredentialsProvider(credentialsProvider);
  } else {
    builder.setDefaultCookieStore(new NoCookieStore());
  }

  builder.setKeepAliveStrategy( DefaultConnectionKeepAliveStrategy.INSTANCE );
  builder.setConnectionReuseStrategy( DefaultConnectionReuseStrategy.INSTANCE );
  builder.setRedirectStrategy( new NeverRedirectStrategy() );
  builder.setRetryHandler( new NeverRetryHandler() );

  int maxConnections = getMaxConnections( filterConfig );
  builder.setMaxConnTotal( maxConnections );
  builder.setMaxConnPerRoute( maxConnections );

  builder.setDefaultRequestConfig(getRequestConfig(filterConfig, serviceRole));

  // See KNOX-1530 for details
  builder.disableContentCompression();

  return builder.build();
}