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class Extensible;
class Module;
enum SerializeFormat
{
/** Shown to a human (does not need to be unserializable) */
FORMAT_USER,
/** Passed internally to this process (i.e. for /RELOADMODULE) */
FORMAT_INTERNAL,
/** Passed to other servers on the network (i.e. METADATA s2s command) */
FORMAT_NETWORK,
/** Stored on disk (i.e. permchannel database) */
FORMAT_PERSIST
};
/** Class represnting an extension of some object
*/
class CoreExport ExtensionItem
{
public:
const std::string key;
Module* const owner;
ExtensionItem(const std::string& key, Module* owner);
virtual ~ExtensionItem();
/** Serialize this item into a string
*
* @param format The format to serialize to
* @param container The object containing this item
* @param item The item itself
*/
virtual std::string serialize(SerializeFormat format, const Extensible* container, void* item) = 0;
/** Convert the string form back into an item
* @param format The format to serialize from (not FORMAT_USER)
* @param container The object that this item applies to
* @param value The return from a serialize() call that was run elsewhere with this key
*/
virtual void unserialize(SerializeFormat format, Extensible* container, const std::string& value) = 0;
/** Free the item */
virtual void free(void* item) = 0;
protected:
/** Get the item from the internal map */
void* get_raw(const Extensible* container);
/** Set the item in the internal map; returns old value */
void* set_raw(Extensible* container, void* value);
/** Remove the item from the internal map; returns old value */
void* unset_raw(Extensible* container);
};
/** A private data store for an Extensible class */
CoreExport typedef std::map<std::string,void*> ExtensibleStore;
/** class Extensible is the parent class of many classes such as User and Channel.
* class Extensible implements a system which allows modules to 'extend' the class by attaching data within
* a map associated with the object. In this way modules can store their own custom information within user
* objects, channel objects and server objects, without breaking other modules (this is more sensible than using
* a flags variable, and each module defining bits within the flag as 'theirs' as it is less prone to conflict and
* supports arbitary data storage).
*/
class CoreExport Extensible : public classbase
{
/** Private data store.
* Holds all extensible metadata for the class.
*/
ExtensibleStore extensions;
typedef std::map<std::string, ExtensionItem*> ExtensibleTypes;
static ExtensibleTypes extension_types;
public:
/**
* Get the extension items for iteraton (i.e. for metadata sync during netburst)
*/
inline const ExtensibleStore& GetExtList() const { return extensions; }
static inline const ExtensibleTypes& GetTypeList() { return extension_types; }
static inline ExtensionItem* GetItem(const std::string& name)
{
ExtensibleTypes::iterator i = extension_types.find(name);
if (i == extension_types.end())
return NULL;
return i->second;
}
virtual ~Extensible();
static bool Register(ExtensionItem* item);
static std::vector<ExtensionItem*> BeginUnregister(Module* module);
void doUnhookExtensions(const std::vector<ExtensionItem*>& toRemove);
// Friend access for the protected getter/setter
friend class ExtensionItem;
};
/** Base class for items that are NOT synchronized between servers */
class LocalExtItem : public ExtensionItem
{
public:
LocalExtItem(const std::string& key, Module* owner);
virtual ~LocalExtItem();
virtual std::string serialize(SerializeFormat format, const Extensible* container, void* item);
virtual void unserialize(SerializeFormat format, Extensible* container, const std::string& value);
virtual void free(void* item) = 0;
};
template<typename T>
class SimpleExtItem : public LocalExtItem
{
public:
SimpleExtItem(const std::string& Key, Module* parent) : LocalExtItem(Key, parent)
{
}
virtual ~SimpleExtItem()
{
}
inline T* get(const Extensible* container)
{
return static_cast<T*>(get_raw(container));
}
inline T* getNew(Extensible* container)
{
T* ptr = get(container);
if (!ptr)
{
ptr = new T;
set_raw(container, ptr);
}
return ptr;
}
inline void set(Extensible* container, const T& value)
{
T* ptr = new T(value);
T* old = static_cast<T*>(set_raw(container, ptr));
delete old;
}
inline void set(Extensible* container, T* value)
{
T* old = static_cast<T*>(set_raw(container, value));
delete old;
}
inline void unset(Extensible* container)
{
T* old = static_cast<T*>(unset_raw(container));
delete old;
}
virtual void free(void* item)
{
delete static_cast<T*>(item);
}
};
class LocalStringExt : public SimpleExtItem<std::string>
{
public:
LocalStringExt(const std::string& key, Module* owner);
virtual ~LocalStringExt();
std::string serialize(SerializeFormat format, const Extensible* container, void* item);
};
class LocalIntExt : public LocalExtItem
{
public:
LocalIntExt(const std::string& key, Module* owner);
virtual ~LocalIntExt();
std::string serialize(SerializeFormat format, const Extensible* container, void* item);
intptr_t get(const Extensible* container);
intptr_t set(Extensible* container, intptr_t value);
void free(void* item);
};
class StringExtItem : public ExtensionItem
{
public:
StringExtItem(const std::string& key, Module* owner);
virtual ~StringExtItem();
std::string* get(const Extensible* container);
std::string serialize(SerializeFormat format, const Extensible* container, void* item);
void unserialize(SerializeFormat format, Extensible* container, const std::string& value);
void set(Extensible* container, const std::string& value);
void unset(Extensible* container);
void free(void* item);
};
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