icinga2/lib/base/attribute.h

138 lines
3.7 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#ifndef ATTRIBUTE_H
#define ATTRIBUTE_H
#include "base/value.h"
namespace icinga
{
/**
* The type of an attribute for a DynamicObject.
*
* @ingroup base
*/
enum AttributeType
{
Attribute_Transient = 1,
/* Unlike transient attributes local attributes are persisted
* in the program state file. */
Attribute_Local = 2,
/* Replicated attributes are sent to other daemons for which
* replication is enabled. */
Attribute_Replicated = 4,
/* Attributes read from the config file are implicitly marked
* as config attributes. */
Attribute_Config = 8,
/* Combination of all attribute types */
Attribute_All = Attribute_Transient | Attribute_Local | Attribute_Replicated | Attribute_Config
};
class I2_BASE_API AttributeBase
{
public:
AttributeBase(void);
void Set(const Value& value);
Value Get(void) const;
operator Value(void) const;
bool IsEmpty(void) const;
protected:
void InternalSet(const Value& value);
const Value& InternalGet(void) const;
private:
Value m_Value;
AttributeBase(const AttributeBase& other);
AttributeBase& operator=(const AttributeBase& other);
};
template<typename T>
class Attribute : public AttributeBase
{
public:
void Set(const T& value)
{
AttributeBase::Set(value);
}
Attribute<T>& operator=(const T& rhs)
{
Set(rhs);
return *this;
}
T Get(void) const
{
Value value = AttributeBase::Get();
if (value.IsEmpty())
return T();
return static_cast<T>(value);
}
operator T(void) const
{
return Get();
}
};
/**
* An attribute for a DynamicObject.
*
* @ingroup base
*/
class I2_BASE_API AttributeHolder
{
public:
AttributeHolder(AttributeType type, AttributeBase *boundAttribute = NULL);
AttributeHolder(const AttributeHolder& other);
~AttributeHolder(void);
void Bind(AttributeBase *boundAttribute);
void SetValue(double tx, const Value& value);
Value GetValue(void) const;
void SetType(AttributeType type);
AttributeType GetType(void) const;
void SetTx(double tx);
double GetTx(void) const;
private:
AttributeType m_Type; /**< The type of the attribute. */
double m_Tx; /**< The timestamp of the last value change. */
bool m_OwnsAttribute; /**< Whether we own the Data pointer. */
AttributeBase *m_Attribute; /**< The current value of the attribute. */
};
}
#endif /* ATTRIBUTE_H */