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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
#include "base/namespace.hpp"
#include "base/objectlock.hpp"
#include "base/debug.hpp"
#include "base/primitivetype.hpp"
#include "base/debuginfo.hpp"
#include "base/exception.hpp"
#include <sstream>
using namespace icinga;
template class std::map<icinga::String, std::shared_ptr<icinga::NamespaceValue> >;
REGISTER_PRIMITIVE_TYPE(Namespace, Object, Namespace::GetPrototype());
/**
* Creates a new namespace.
*
* @param constValues If true, all values inserted into the namespace are treated as constants and can't be updated.
*/
Namespace::Namespace(bool constValues)
: m_ConstValues(constValues), m_Frozen(false)
{ }
Value Namespace::Get(const String& field) const
{
Value value;
if (!Get(field, &value))
BOOST_THROW_EXCEPTION(ScriptError("Namespace does not contain field '" + field + "'"));
return value;
}
bool Namespace::Get(const String& field, Value *value) const
{
auto lock(ReadLockUnlessFrozen());
auto nsVal = m_Data.find(field);
if (nsVal == m_Data.end()) {
return false;
}
*value = nsVal->second.Val;
return true;
}
void Namespace::Set(const String& field, const Value& value, bool isConst, const DebugInfo& debugInfo)
{
ObjectLock olock(this);
if (m_Frozen) {
BOOST_THROW_EXCEPTION(ScriptError("Namespace is read-only and must not be modified.", debugInfo));
}
std::unique_lock<decltype(m_DataMutex)> dlock (m_DataMutex);
auto nsVal = m_Data.find(field);
if (nsVal == m_Data.end()) {
m_Data[field] = NamespaceValue{value, isConst || m_ConstValues};
} else {
if (nsVal->second.Const) {
BOOST_THROW_EXCEPTION(ScriptError("Constant must not be modified.", debugInfo));
}
nsVal->second.Val = value;
}
}
/**
* Returns the number of elements in the namespace.
*
* @returns Number of elements.
*/
size_t Namespace::GetLength() const
{
auto lock(ReadLockUnlessFrozen());
return m_Data.size();
}
bool Namespace::Contains(const String& field) const
{
auto lock (ReadLockUnlessFrozen());
return m_Data.find(field) != m_Data.end();
}
void Namespace::Remove(const String& field)
{
ObjectLock olock(this);
if (m_Frozen) {
BOOST_THROW_EXCEPTION(ScriptError("Namespace is read-only and must not be modified."));
}
std::unique_lock<decltype(m_DataMutex)> dlock (m_DataMutex);
auto it = m_Data.find(field);
if (it == m_Data.end()) {
return;
}
if (it->second.Const) {
BOOST_THROW_EXCEPTION(ScriptError("Constants must not be removed."));
}
m_Data.erase(it);
}
/**
* Freeze the namespace, preventing further updates.
*
* This only prevents inserting, replacing or deleting values from the namespace. This operation has no effect on
* objects referenced by the values, these remain mutable if they were before.
*/
void Namespace::Freeze() {
ObjectLock olock(this);
m_Frozen = true;
}
std::shared_lock<std::shared_timed_mutex> Namespace::ReadLockUnlessFrozen() const
{
if (m_Frozen.load(std::memory_order_relaxed)) {
return std::shared_lock<std::shared_timed_mutex>();
} else {
return std::shared_lock<std::shared_timed_mutex>(m_DataMutex);
}
}
Value Namespace::GetFieldByName(const String& field, bool, const DebugInfo& debugInfo) const
{
auto lock (ReadLockUnlessFrozen());
auto nsVal = m_Data.find(field);
if (nsVal != m_Data.end())
return nsVal->second.Val;
else
return GetPrototypeField(const_cast<Namespace *>(this), field, false, debugInfo); /* Ignore indexer not found errors similar to the Dictionary class. */
}
void Namespace::SetFieldByName(const String& field, const Value& value, bool overrideFrozen, const DebugInfo& debugInfo)
{
// The override frozen parameter is mandated by the interface but ignored here. If the namespace is frozen, this
// disables locking for read operations, so it must not be modified again to ensure the consistency of the internal
// data structures.
(void) overrideFrozen;
Set(field, value, false, debugInfo);
}
bool Namespace::HasOwnField(const String& field) const
{
return Contains(field);
}
bool Namespace::GetOwnField(const String& field, Value *result) const
{
return Get(field, result);
}
Namespace::Iterator Namespace::Begin()
{
ASSERT(OwnsLock());
return m_Data.begin();
}
Namespace::Iterator Namespace::End()
{
ASSERT(OwnsLock());
return m_Data.end();
}
Namespace::Iterator icinga::begin(const Namespace::Ptr& x)
{
return x->Begin();
}
Namespace::Iterator icinga::end(const Namespace::Ptr& x)
{
return x->End();
}
|
