spring-cloud-previews/google-cloud-discoveryengine-spring-starter/src/main/java/com/google/cloud/discoveryengine/v1/spring/CompletionServiceSpringAutoConfiguration.java [123:184]:
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  public CompletionServiceSettings completionServiceSettings(
      @Qualifier("defaultCompletionServiceTransportChannelProvider")
          TransportChannelProvider defaultTransportChannelProvider)
      throws IOException {
    CompletionServiceSettings.Builder clientSettingsBuilder;
    if (this.clientProperties.getUseRest()) {
      clientSettingsBuilder = CompletionServiceSettings.newHttpJsonBuilder();
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("Using REST (HTTP/JSON) transport.");
      }
    } else {
      clientSettingsBuilder = CompletionServiceSettings.newBuilder();
    }
    clientSettingsBuilder
        .setCredentialsProvider(this.credentialsProvider)
        .setTransportChannelProvider(defaultTransportChannelProvider)
        .setEndpoint(CompletionServiceSettings.getDefaultEndpoint())
        .setHeaderProvider(this.userAgentHeaderProvider());
    if (this.clientProperties.getQuotaProjectId() != null) {
      clientSettingsBuilder.setQuotaProjectId(this.clientProperties.getQuotaProjectId());
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace(
            "Quota project id set to "
                + this.clientProperties.getQuotaProjectId()
                + ", this overrides project id from credentials.");
      }
    }
    if (this.clientProperties.getExecutorThreadCount() != null) {
      ExecutorProvider executorProvider =
          CompletionServiceSettings.defaultExecutorProviderBuilder()
              .setExecutorThreadCount(this.clientProperties.getExecutorThreadCount())
              .build();
      clientSettingsBuilder.setBackgroundExecutorProvider(executorProvider);
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace(
            "Background executor thread count is "
                + this.clientProperties.getExecutorThreadCount());
      }
    }
    Retry serviceRetry = clientProperties.getRetry();
    if (serviceRetry != null) {
      RetrySettings completeQueryRetrySettings =
          RetryUtil.updateRetrySettings(
              clientSettingsBuilder.completeQuerySettings().getRetrySettings(), serviceRetry);
      clientSettingsBuilder.completeQuerySettings().setRetrySettings(completeQueryRetrySettings);

      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("Configured service-level retry settings from properties.");
      }
    }
    Retry completeQueryRetry = clientProperties.getCompleteQueryRetry();
    if (completeQueryRetry != null) {
      RetrySettings completeQueryRetrySettings =
          RetryUtil.updateRetrySettings(
              clientSettingsBuilder.completeQuerySettings().getRetrySettings(), completeQueryRetry);
      clientSettingsBuilder.completeQuerySettings().setRetrySettings(completeQueryRetrySettings);
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("Configured method-level retry settings for completeQuery from properties.");
      }
    }
    return clientSettingsBuilder.build();
  }
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spring-cloud-previews/google-cloud-retail-spring-starter/src/main/java/com/google/cloud/retail/v2/spring/CompletionServiceSpringAutoConfiguration.java [123:184]:
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  public CompletionServiceSettings completionServiceSettings(
      @Qualifier("defaultCompletionServiceTransportChannelProvider")
          TransportChannelProvider defaultTransportChannelProvider)
      throws IOException {
    CompletionServiceSettings.Builder clientSettingsBuilder;
    if (this.clientProperties.getUseRest()) {
      clientSettingsBuilder = CompletionServiceSettings.newHttpJsonBuilder();
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("Using REST (HTTP/JSON) transport.");
      }
    } else {
      clientSettingsBuilder = CompletionServiceSettings.newBuilder();
    }
    clientSettingsBuilder
        .setCredentialsProvider(this.credentialsProvider)
        .setTransportChannelProvider(defaultTransportChannelProvider)
        .setEndpoint(CompletionServiceSettings.getDefaultEndpoint())
        .setHeaderProvider(this.userAgentHeaderProvider());
    if (this.clientProperties.getQuotaProjectId() != null) {
      clientSettingsBuilder.setQuotaProjectId(this.clientProperties.getQuotaProjectId());
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace(
            "Quota project id set to "
                + this.clientProperties.getQuotaProjectId()
                + ", this overrides project id from credentials.");
      }
    }
    if (this.clientProperties.getExecutorThreadCount() != null) {
      ExecutorProvider executorProvider =
          CompletionServiceSettings.defaultExecutorProviderBuilder()
              .setExecutorThreadCount(this.clientProperties.getExecutorThreadCount())
              .build();
      clientSettingsBuilder.setBackgroundExecutorProvider(executorProvider);
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace(
            "Background executor thread count is "
                + this.clientProperties.getExecutorThreadCount());
      }
    }
    Retry serviceRetry = clientProperties.getRetry();
    if (serviceRetry != null) {
      RetrySettings completeQueryRetrySettings =
          RetryUtil.updateRetrySettings(
              clientSettingsBuilder.completeQuerySettings().getRetrySettings(), serviceRetry);
      clientSettingsBuilder.completeQuerySettings().setRetrySettings(completeQueryRetrySettings);

      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("Configured service-level retry settings from properties.");
      }
    }
    Retry completeQueryRetry = clientProperties.getCompleteQueryRetry();
    if (completeQueryRetry != null) {
      RetrySettings completeQueryRetrySettings =
          RetryUtil.updateRetrySettings(
              clientSettingsBuilder.completeQuerySettings().getRetrySettings(), completeQueryRetry);
      clientSettingsBuilder.completeQuerySettings().setRetrySettings(completeQueryRetrySettings);
      if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("Configured method-level retry settings for completeQuery from properties.");
      }
    }
    return clientSettingsBuilder.build();
  }
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