1 /*
2  * Copyright (c) Facebook, Inc. and its 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
61