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/* 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();
}
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