grpc/src/cpp/server/server_builder.cc

/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * 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
 * distribution.
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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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#include <grpc++/server_builder.h>

#include <grpc/support/cpu.h>
#include <grpc/support/log.h>
#include <grpc++/impl/service_type.h>
#include <grpc++/server.h>
#include "src/cpp/server/thread_pool.h"

namespace grpc {

ServerBuilder::ServerBuilder()
    : generic_service_(nullptr), thread_pool_(nullptr) {}

void ServerBuilder::RegisterService(SynchronousService* service) {
  services_.push_back(service->service());
}

void ServerBuilder::RegisterAsyncService(AsynchronousService* service) {
  async_services_.push_back(service);
}

void ServerBuilder::RegisterAsyncGenericService(AsyncGenericService* service) {
  if (generic_service_) {
    gpr_log(GPR_ERROR,
            "Adding multiple AsyncGenericService is unsupported for now. "
            "Dropping the service %p",
            service);
    return;
  }
  generic_service_ = service;
}

void ServerBuilder::AddPort(const grpc::string& addr,
                            std::shared_ptr<ServerCredentials> creds,
                            int* selected_port) {
  ports_.push_back(Port{addr, creds, selected_port});
}

void ServerBuilder::SetThreadPool(ThreadPoolInterface* thread_pool) {
  thread_pool_ = thread_pool;
}

std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
  bool thread_pool_owned = false;
  if (!async_services_.empty() && !services_.empty()) {
    gpr_log(GPR_ERROR, "Mixing async and sync services is unsupported for now");
    return nullptr;
  }
  if (!thread_pool_ && !services_.empty()) {
    int cores = gpr_cpu_num_cores();
    if (!cores) cores = 4;
    thread_pool_ = new ThreadPool(cores);
    thread_pool_owned = true;
  }
  std::unique_ptr<Server> server(new Server(thread_pool_, thread_pool_owned));
  for (auto* service : services_) {
    if (!server->RegisterService(service)) {
      return nullptr;
    }
  }
  for (auto* service : async_services_) {
    if (!server->RegisterAsyncService(service)) {
      return nullptr;
    }
  }
  if (generic_service_) {
    server->RegisterAsyncGenericService(generic_service_);
  }
  for (auto& port : ports_) {
    int r = server->AddPort(port.addr, port.creds.get());
    if (!r) return nullptr;
    if (port.selected_port != nullptr) {
      *port.selected_port = r;
    }
  }
  if (!server->Start()) {
    return nullptr;
  }
  return server;
}

}  // namespace grpc