Updating for 1.0.2 release
[awesomized/libmemcached] / util / instance.hpp
1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
2 *
3 * DataDifferential Utility Library
4 *
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * All rights reserved.
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8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
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12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * * Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following disclaimer
17 * in the documentation and/or other materials provided with the
18 * distribution.
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22 * written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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36 */
37
38 #pragma once
39
40 #include <arpa/inet.h>
41 #include <cstdio>
42 #include <cerrno>
43 #include <cassert>
44 #include <cstddef>
45 #include <sys/socket.h>
46 #include <string>
47
48 #include "util/operation.hpp"
49
50 struct addrinfo;
51
52 namespace datadifferential {
53 namespace util {
54
55 class Instance
56 {
57 private:
58 enum connection_state_t {
59 NOT_WRITING,
60 NEXT_CONNECT_ADDRINFO,
61 CONNECT,
62 CONNECTING,
63 CONNECTED,
64 WRITING,
65 READING,
66 FINISHED
67 };
68 std::string _last_error;
69
70 public: // Callbacks
71 class Finish {
72
73 public:
74 virtual ~Finish() { }
75
76 virtual bool call(const bool, const std::string &)= 0;
77 };
78
79
80 public:
81 Instance(const std::string& hostname_arg, const std::string& service_arg);
82
83 Instance(const std::string& hostname_arg, const in_port_t port_arg);
84
85 ~Instance();
86
87 bool run();
88
89 void set_finish(Finish *arg)
90 {
91 _finish_fn= arg;
92 }
93
94 void push(util::Operation *next)
95 {
96 _operations.push_back(next);
97 }
98
99 private:
100 void close_socket();
101
102 void free_addrinfo();
103
104 bool more_to_read() const;
105
106 std::string _host;
107 std::string _service;
108 int _sockfd;
109 connection_state_t state;
110 struct addrinfo *_addrinfo;
111 struct addrinfo *_addrinfo_next;
112 Finish *_finish_fn;
113 Operation::vector _operations;
114 };
115
116 } /* namespace util */
117 } /* namespace datadifferential */