grpc/include/grpc++/server_builder.h

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#ifndef GRPCXX_SERVER_BUILDER_H
#define GRPCXX_SERVER_BUILDER_H

#include <map>
#include <memory>
#include <vector>

#include <grpc++/impl/server_builder_option.h>
#include <grpc++/impl/server_builder_plugin.h>
#include <grpc++/support/config.h>
#include <grpc/compression.h>

namespace grpc {

class AsyncGenericService;
class CompletionQueue;
class RpcService;
class Server;
class ServerCompletionQueue;
class ServerCredentials;
class Service;

namespace testing {
class ServerBuilderPluginTest;
}  // namespace testing

/// A builder class for the creation and startup of \a grpc::Server instances.
class ServerBuilder {
 public:
  ServerBuilder();

  /// Register a service. This call does not take ownership of the service.
  /// The service must exist for the lifetime of the \a Server instance returned
  /// by \a BuildAndStart().
  /// Matches requests with any :authority
  void RegisterService(Service* service);

  /// Register a generic service.
  /// Matches requests with any :authority
  void RegisterAsyncGenericService(AsyncGenericService* service);

  /// Register a service. This call does not take ownership of the service.
  /// The service must exist for the lifetime of the \a Server instance returned
  /// by BuildAndStart().
  /// Only matches requests with :authority \a host
  void RegisterService(const grpc::string& host, Service* service);

  /// Set max message size in bytes.
  void SetMaxMessageSize(int max_message_size) {
    max_message_size_ = max_message_size;
  }

  /// Set the compression options to be used by the server.
  void SetCompressionOptions(const grpc_compression_options& options) {
    compression_options_ = options;
  }

  void SetOption(std::unique_ptr<ServerBuilderOption> option);

  /// Tries to bind \a server to the given \a addr.
  ///
  /// It can be invoked multiple times.
  ///
  /// \param addr The address to try to bind to the server (eg, localhost:1234,
  /// 192.168.1.1:31416, [::1]:27182, etc.).
  /// \params creds The credentials associated with the server.
  /// \param selected_port[out] Upon success, updated to contain the port
  /// number. \a nullptr otherwise.
  ///
  // TODO(dgq): the "port" part seems to be a misnomer.
  void AddListeningPort(const grpc::string& addr,
                        std::shared_ptr<ServerCredentials> creds,
                        int* selected_port = nullptr);

  /// Add a completion queue for handling asynchronous services
  /// Caller is required to keep this completion queue live until
  /// the server is destroyed.
  ///
  /// \param is_frequently_polled This is an optional parameter to inform GRPC
  /// library about whether this completion queue would be frequently polled
  /// (i.e by calling Next() or AsyncNext()). The default value is 'true' and is
  /// the recommended setting. Setting this to 'false' (i.e not polling the
  /// completion queue frequently) will have a significantly negative
  /// performance impact and hence should not be used in production use cases.
  std::unique_ptr<ServerCompletionQueue> AddCompletionQueue(
      bool is_frequently_polled = true);

  /// Return a running server which is ready for processing calls.
  std::unique_ptr<Server> BuildAndStart();

  /// For internal use only: Register a ServerBuilderPlugin factory function.
  static void InternalAddPluginFactory(
      std::unique_ptr<ServerBuilderPlugin> (*CreatePlugin)());

 private:
  friend class ::grpc::testing::ServerBuilderPluginTest;

  struct Port {
    grpc::string addr;
    std::shared_ptr<ServerCredentials> creds;
    int* selected_port;
  };

  typedef std::unique_ptr<grpc::string> HostString;
  struct NamedService {
    explicit NamedService(Service* s) : service(s) {}
    NamedService(const grpc::string& h, Service* s)
        : host(new grpc::string(h)), service(s) {}
    HostString host;
    Service* service;
  };

  int max_message_size_;
  grpc_compression_options compression_options_;
  std::vector<std::unique_ptr<ServerBuilderOption>> options_;
  std::vector<std::unique_ptr<NamedService>> services_;
  std::vector<Port> ports_;
  std::vector<ServerCompletionQueue*> cqs_;
  std::shared_ptr<ServerCredentials> creds_;
  std::vector<std::unique_ptr<ServerBuilderPlugin>> plugins_;
  AsyncGenericService* generic_service_;
};

}  // namespace grpc

#endif  // GRPCXX_SERVER_BUILDER_H