grpcpp/support/channel_arguments.h

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/*
 *
 * Copyright 2015 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
 
#ifndef GRPCPP_SUPPORT_CHANNEL_ARGUMENTS_H
#define GRPCPP_SUPPORT_CHANNEL_ARGUMENTS_H
 
#include <list>
#include <vector>
 
#include <grpc/compression.h>
#include <grpc/grpc.h>
#include <grpcpp/resource_quota.h>
#include <grpcpp/support/config.h>
 
namespace grpc {
class SecureChannelCredentials;
namespace testing {
class ChannelArgumentsTest;
}  // namespace testing
 
class ChannelArguments {
 public:
  ChannelArguments();
  ~ChannelArguments();
 
  ChannelArguments(const ChannelArguments& other);
  ChannelArguments& operator=(ChannelArguments other) {
    Swap(other);
    return *this;
  }
 
  void Swap(ChannelArguments& other);
 
  void SetChannelArgs(grpc_channel_args* channel_args) const;
 
  // gRPC specific channel argument setters
  void SetSslTargetNameOverride(const std::string& name);
  // TODO(yangg) add flow control options
  void SetCompressionAlgorithm(grpc_compression_algorithm algorithm);
 
  void SetGrpclbFallbackTimeout(int fallback_timeout);
 
  void SetSocketMutator(grpc_socket_mutator* mutator);
 
  void SetUserAgentPrefix(const std::string& user_agent_prefix);
 
  void SetResourceQuota(const grpc::ResourceQuota& resource_quota);
 
  void SetMaxReceiveMessageSize(int size);
  void SetMaxSendMessageSize(int size);
 
  void SetLoadBalancingPolicyName(const std::string& lb_policy_name);
 
  void SetServiceConfigJSON(const std::string& service_config_json);
 
  // Generic channel argument setter. Only for advanced use cases.
  void SetInt(const std::string& key, int value);
 
  // Generic channel argument setter. Only for advanced use cases.
  void SetPointer(const std::string& key, void* value);
 
  void SetPointerWithVtable(const std::string& key, void* value,
                            const grpc_arg_pointer_vtable* vtable);
 
  void SetString(const std::string& key, const std::string& value);
 
  grpc_channel_args c_channel_args() const {
    grpc_channel_args out;
    out.num_args = args_.size();
    out.args = args_.empty() ? nullptr : const_cast<grpc_arg*>(&args_[0]);
    return out;
  }
 
 private:
  friend class grpc::SecureChannelCredentials;
  friend class grpc::testing::ChannelArgumentsTest;
 
  struct PointerVtableMembers {
    static void* Copy(void* in) { return in; }
    static void Destroy(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.
  std::string GetSslTargetNameOverride() const;
 
  std::vector<grpc_arg> args_;
  std::list<std::string> strings_;
};
 
}  // namespace grpc
 
#endif  // GRPCPP_SUPPORT_CHANNEL_ARGUMENTS_H