1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <boost/config.hpp>
#include <iosfwd>
#include <string>
#include "mongo/base/error_codes.h"
#include "mongo/platform/atomic_word.h"
namespace mongo {
/**
* Status represents an error state or the absence thereof.
*
* A Status uses the standardized error codes -- from file 'error_codes.h' -- to
* determine an error's cause. It further clarifies the error with a textual
* description. Optionally, a Status may also have an error location number, which
* should be a unique, grep-able point in the code base (including assert numbers).
*
* Example usage:
*
* Status sumAB(int a, int b, int* c) {
* if (overflowIfSum(a,b)) {
* return Status(ErrorCodes::ERROR_OVERFLOW, "overflow in sumAB", 16494);
* }
*
* *c = a+b;
* return Status::OK();
* }
*
* TODO: expand base/error_codes.h to capture common errors in current code
* TODO: generate base/error_codes.h out of a description file
* TODO: check 'location' duplicates against assert numbers
*/
class Status {
public:
// Short-hand for returning an OK status.
static inline Status OK();
/**
* Builds an error status given the error code, a textual description of what
* caused the error, and a unique position in the where the error occurred
* (similar to an assert number)
*/
Status(ErrorCodes::Error code, std::string reason, int location = 0);
inline Status(const Status& other);
inline Status& operator=(const Status& other);
inline Status(Status&& other) BOOST_NOEXCEPT;
inline Status& operator=(Status&& other) BOOST_NOEXCEPT;
inline ~Status();
/**
* Returns true if 'other's error code and location are equal/different to this
* instance's. Otherwise returns false.
*/
bool compare(const Status& other) const;
bool operator==(const Status& other) const;
bool operator!=(const Status& other) const;
/**
* Returns true if 'other's error code is equal/different to this instance's.
* Otherwise returns false.
*/
bool compareCode(const ErrorCodes::Error other) const;
bool operator==(const ErrorCodes::Error other) const;
bool operator!=(const ErrorCodes::Error other) const;
//
// accessors
//
inline bool isOK() const;
inline ErrorCodes::Error code() const;
inline std::string codeString() const;
inline std::string reason() const;
inline int location() const;
std::string toString() const;
//
// Below interface used for testing code only.
//
inline AtomicUInt32::WordType refCount() const;
private:
inline Status();
struct ErrorInfo {
AtomicUInt32 refs; // reference counter
const ErrorCodes::Error code; // error code
const std::string reason; // description of error cause
const int location; // unique location of the triggering line in the code
static ErrorInfo* create(ErrorCodes::Error code, std::string reason, int location);
ErrorInfo(ErrorCodes::Error code, std::string reason, int location);
};
ErrorInfo* _error;
/**
* Increment/Decrement the reference counter inside an ErrorInfo
*
* @param error ErrorInfo to be incremented
*/
static inline void ref(ErrorInfo* error);
static inline void unref(ErrorInfo* error);
};
inline bool operator==(const ErrorCodes::Error lhs, const Status& rhs);
inline bool operator!=(const ErrorCodes::Error lhs, const Status& rhs);
//
// Convenience method for unittest code. Please use accessors otherwise.
//
std::ostream& operator<<(std::ostream& os, const Status& status);
std::ostream& operator<<(std::ostream& os, ErrorCodes::Error);
} // namespace mongo
#include "mongo/base/status-inl.h"
|
