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
41namespace Hdfs {
42namespace Internal {
43
44class 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