third-party/thrift/src/thrift/lib/cpp2/transport/util/ConnectionThread.h

   1 /*
   2  * Copyright (c) Meta Platforms, Inc. and affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #pragma once
  18
  19 #include <stdint.h>
  20
  21 #include <memory>
  22 #include <string>
  23 #include <unordered_map>
  24 #include <vector>
  25
  26 #include <folly/Synchronized.h>
  27 #include <folly/io/async/ScopedEventBaseThread.h>
  28 #include <thrift/lib/cpp2/transport/core/ClientConnectionIf.h>
  29
  30 DECLARE_string(transport);
  31
  32 namespace apache {
  33 namespace thrift {
  34
  35 /**
  36  * A connection thread that handles connections to servers - one
  37  * connection per server.
  38  */
  39 class ConnectionThread : public folly::ScopedEventBaseThread {
  40  public:
  41   ConnectionThread() = default;
  42   ~ConnectionThread();
  43
  44   // Returns a connection that may be used to talk to a server at
  45   // "addr:port".
  46   std::shared_ptr<ClientConnectionIf> getConnection(
  47       const std::string& addr, uint16_t port);
  48
  49  private:
  50   // Creates a new connection on the provided event base if necessary.
  51   void maybeCreateConnection(
  52       const std::string& serverKey, const std::string& addr, uint16_t port);
  53
  54   folly::Synchronized<
  55       std::unordered_map<std::string, std::shared_ptr<ClientConnectionIf>>>
  56       connections_;
  57 };
  58
  59 } // namespace thrift
  60 } // namespace apache