1 | /******************************************************************** |
2 | * Copyright (c) 2013 - 2014, Pivotal Inc. |
3 | * All rights reserved. |
4 | * |
5 | * Author: Zhanwei Wang |
6 | ********************************************************************/ |
7 | /******************************************************************** |
8 | * 2014 - |
9 | * open source under Apache License Version 2.0 |
10 | ********************************************************************/ |
11 | /** |
12 | * Licensed to the Apache Software Foundation (ASF) under one |
13 | * or more contributor license agreements. See the NOTICE file |
14 | * distributed with this work for additional information |
15 | * regarding copyright ownership. The ASF licenses this file |
16 | * to you under the Apache License, Version 2.0 (the |
17 | * "License"); you may not use this file except in compliance |
18 | * with the License. You may obtain a copy of the License at |
19 | * |
20 | * http://www.apache.org/licenses/LICENSE-2.0 |
21 | * |
22 | * Unless required by applicable law or agreed to in writing, software |
23 | * distributed under the License is distributed on an "AS IS" BASIS, |
24 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
25 | * See the License for the specific language governing permissions and |
26 | * limitations under the License. |
27 | */ |
28 | #ifndef _HDFS_LIBHDFS3_CLIENT_PEERCACHE_H_ |
29 | #define _HDFS_LIBHDFS3_CLIENT_PEERCACHE_H_ |
30 | |
31 | #include <string> |
32 | #include <utility> |
33 | |
34 | #include "common/DateTime.h" |
35 | #include "common/LruMap.h" |
36 | #include "common/Memory.h" |
37 | #include "common/SessionConfig.h" |
38 | #include "network/Socket.h" |
39 | #include "server/DatanodeInfo.h" |
40 | |
41 | namespace Hdfs { |
42 | namespace Internal { |
43 | |
44 | class PeerCache { |
45 | public: |
46 | explicit PeerCache(const SessionConfig& conf); |
47 | |
48 | shared_ptr<Socket> getConnection(const DatanodeInfo& datanode); |
49 | |
50 | void addConnection(shared_ptr<Socket> peer, const DatanodeInfo& datanode); |
51 | |
52 | typedef std::pair<shared_ptr<Socket>, steady_clock::time_point> value_type; |
53 | |
54 | private: |
55 | std::string buildKey(const DatanodeInfo& datanode); |
56 | |
57 | private: |
58 | const int cacheSize; |
59 | int64_t expireTimeInterval; // milliseconds |
60 | static LruMap<std::string, value_type> Map; |
61 | }; |
62 | } |
63 | } |
64 | |
65 | #endif /* _HDFS_LIBHDFS3_CLIENT_PEERCACHE_H_ */ |
66 | |