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 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;

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 grpc::string& name);
  // TODO(yangg) add flow control options
  void SetCompressionAlgorithm(grpc_compression_algorithm algorithm);

  void SetSocketMutator(grpc_socket_mutator* mutator);

  void SetUserAgentPrefix(const grpc::string& user_agent_prefix);

  void SetResourceQuota(const ResourceQuota& resource_quota);

  void SetMaxReceiveMessageSize(int size);
  void SetMaxSendMessageSize(int size);

  void SetLoadBalancingPolicyName(const grpc::string& lb_policy_name);

  void SetServiceConfigJSON(const grpc::string& service_config_json);

  // Generic channel argument setters. Only for advanced use cases.
  void SetInt(const grpc::string& key, int value);

  // Generic channel argument setter. Only for advanced use cases.
  void SetPointer(const grpc::string& key, void* value);

  void SetPointerWithVtable(const grpc::string& key, void* value,
                            const grpc_arg_pointer_vtable* vtable);

  void SetString(const grpc::string& key, const grpc::string& value);

  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;

  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