Method withOption

api/src/main/java/io/grpc/CallOptions.java:400–425

Sets a custom option. Any existing value for the key is overwritten. @param key The option key @param value The option value. @since 1.13.0

(Key<T> key, T value)

   * @since 1.13.0
   */
  public <T> CallOptions withOption(Key<T> key, T value) {
    Preconditions.checkNotNull(key, "key");
    Preconditions.checkNotNull(value, "value");

    Builder builder = toBuilder(this);
    int existingIdx = -1;
    for (int i = 0; i < customOptions.length; i++) {
      if (key.equals(customOptions[i][0])) {
        existingIdx = i;
        break;
      }
    }

    builder.customOptions = new Object[customOptions.length + (existingIdx == -1 ? 1 : 0)][2];
    System.arraycopy(customOptions, 0, builder.customOptions, 0, customOptions.length);

    if (existingIdx == -1) {
      // Add a new option
      builder.customOptions[customOptions.length] = new Object[] {key, value};
    } else {
      // Replace an existing option
      builder.customOptions[existingIdx] = new Object[] {key, value};
    }

    return builder.build();
  }

  /**
   * Get the value for a custom option or its inherent default.