text: /*
   *
   * Copyright 2015, Google Inc.
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   * met:
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   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
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   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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   */
  
  #ifndef GRPCXX_SUPPORT_CHANNEL_ARGUMENTS_H
  #define GRPCXX_SUPPORT_CHANNEL_ARGUMENTS_H
  
  #include <list>
  #include <vector>
  
  #include <grpc++/support/config.h>
  #include <grpc/compression.h>
  #include <grpc/grpc.h>
  
  namespace grpc {
  namespace testing {
  class ChannelArgumentsTest;
  }  // namespace testing
  
  class ResourceQuota;
  
  /// Options for channel creation. The user can use generic setters to pass
  /// key value pairs down to C channel creation code. For gRPC related options,
  /// concrete setters are provided.
  class ChannelArguments {
   public:
    ChannelArguments();
    ~ChannelArguments();
  
    ChannelArguments(const ChannelArguments& other);
    ChannelArguments& operator=(ChannelArguments other) {
      Swap(other);
      return *this;
    }
  
    void Swap(ChannelArguments& other);
  
    /// Dump arguments in this instance to \a channel_args. Does not take
    /// ownership of \a channel_args.
    ///
    /// Note that the underlying arguments are shared. Changes made to either \a
    /// channel_args or this instance would be reflected on both.
    void SetChannelArgs(grpc_channel_args* channel_args) const;
  
    // gRPC specific channel argument setters
    /// Set target name override for SSL host name checking. This option is for
    /// testing only and should never be used in production.
    void SetSslTargetNameOverride(const grpc::string& name);
    // TODO(yangg) add flow control options
    /// Set the compression algorithm for the channel.
    void SetCompressionAlgorithm(grpc_compression_algorithm algorithm);
  
    /// Set the socket mutator for the channel.
    void SetSocketMutator(grpc_socket_mutator* mutator);
  
    /// Set the string to prepend to the user agent.
    void SetUserAgentPrefix(const grpc::string& user_agent_prefix);
  
    /// Set the buffer pool to be attached to the constructed channel.
    void SetResourceQuota(const ResourceQuota& resource_quota);
  
    /// Set the max receive and send message sizes.
    void SetMaxReceiveMessageSize(int size);
    void SetMaxSendMessageSize(int size);
  
    /// Set LB policy name.
    /// Note that if the name resolver returns only balancer addresses, the
    /// grpclb LB policy will be used, regardless of what is specified here.
    void SetLoadBalancingPolicyName(const grpc::string& lb_policy_name);
  
    /// Set service config in JSON form.
    /// Primarily meant for use in unit tests.
    void SetServiceConfigJSON(const grpc::string& service_config_json);
  
    // Generic channel argument setters. Only for advanced use cases.
    /// Set an integer argument \a value under \a key.
    void SetInt(const grpc::string& key, int value);
  
    // Generic channel argument setter. Only for advanced use cases.
    /// Set a pointer argument \a value under \a key. Owership is not transferred.
    void SetPointer(const grpc::string& key, void* value);
  
    void SetPointerWithVtable(const grpc::string& key, void* value,
                              const grpc_arg_pointer_vtable* vtable);
  
    /// Set a textual argument \a value under \a key.
    void SetString(const grpc::string& key, const grpc::string& value);
  
    /// Return (by value) a C \a grpc_channel_args structure which points to
    /// arguments owned by this \a ChannelArguments instance
    grpc_channel_args c_channel_args() const {
      grpc_channel_args out;
      out.num_args = args_.size();
      out.args = args_.empty() ? NULL : const_cast<grpc_arg*>(&args_[0]);
      return out;
    }
  
   private:
    friend class SecureChannelCredentials;
    friend class testing::ChannelArgumentsTest;
  
    /// Default pointer argument operations.
    struct PointerVtableMembers {
      static void* Copy(void* in) { return in; }
      static void Destroy(grpc_exec_ctx* exec_ctx, void* in) {}
      static int Compare(void* a, void* b) {
        if (a < b) return -1;
        if (a > b) return 1;
        return 0;
      }
    };
  
    // Returns empty string when it is not set.
    grpc::string GetSslTargetNameOverride() const;
  
    std::vector<grpc_arg> args_;
    std::list<grpc::string> strings_;
  };
  
  }  // namespace grpc
  
  #endif  // GRPCXX_SUPPORT_CHANNEL_ARGUMENTS_H
  