ServiceReferenceBase Class Reference

A reference to a service. More...

Inheritance diagram for ServiceReferenceBase:

Public Member Functions
	ServiceReferenceBase (const ServiceReferenceBase &ref)
	operator bool_type () const
	Converts this ServiceReferenceBase instance into a boolean expression. More...
ServiceReferenceBase &	operator= (std::nullptr_t)
	Releases any resources held or locked by this ServiceReferenceBase and renders it invalid. More...
	~ServiceReferenceBase ()
Any	GetProperty (const std::string &key) const
	Returns the property value to which the specified property key is mapped in the properties ServiceProperties object of the service referenced by this ServiceReferenceBase object. More...
void	GetPropertyKeys (std::vector< std::string > &keys) const
	Returns a list of the keys in the ServiceProperties object of the service referenced by this ServiceReferenceBase object. More...
Module *	GetModule () const
	Returns the module that registered the service referenced by this ServiceReferenceBase object. More...
void	GetUsingModules (std::vector< Module * > &modules) const
	Returns the modules that are using the service referenced by this ServiceReferenceBase object. More...
std::string	GetInterfaceId () const
	Returns the interface identifier this ServiceReferenceBase object is bound to. More...
bool	IsConvertibleTo (const std::string &interfaceid) const
	Checks wether this ServiceReferenceBase object can be converted to another ServiceReferenceBase object, which will be bound to the given interface identifier. More...
bool	operator< (const ServiceReferenceBase &reference) const
	Compares this ServiceReferenceBase with the specified ServiceReferenceBase for order. More...
bool	operator== (const ServiceReferenceBase &reference) const
ServiceReferenceBase &	operator= (const ServiceReferenceBase &reference)

Detailed Description

A reference to a service.

Note

This class is provided as public API for low-level service queries only. In almost all cases you should use the template ServiceReference instead.

Constructor & Destructor Documentation

ServiceReferenceBase::ServiceReferenceBase

(

const ServiceReferenceBase &

ref

)

ServiceReferenceBase::~ServiceReferenceBase

(

)

Member Function Documentation

std::string ServiceReferenceBase::GetInterfaceId

(

)

const

Returns the interface identifier this ServiceReferenceBase object is bound to.

A default constructed ServiceReferenceBase object is not bound to any interface identifier and calling this method will return an empty string.

Returns

The interface identifier for this ServiceReferenceBase object.

Referenced by ServiceReference< S >::ServiceReference().

Module* ServiceReferenceBase::GetModule

(

)

const

Returns the module that registered the service referenced by this ServiceReferenceBase object.

This method must return 0 when the service has been unregistered. This can be used to determine if the service has been unregistered.

Returns

The module that registered the service referenced by this ServiceReferenceBase object; 0 if that service has already been unregistered.

See also

ModuleContext::RegisterService(const InterfaceMap&, const ServiceProperties&)

Any ServiceReferenceBase::GetProperty

(

const std::string &

key

)

const

Returns the property value to which the specified property key is mapped in the properties ServiceProperties object of the service referenced by this ServiceReferenceBase object.

Property keys are case-insensitive.

This method continues to return property values after the service has been unregistered. This is so references to unregistered services can still be interrogated.

Parameters

key	The property key.

Returns

The property value to which the key is mapped; an invalid Any if there is no property named after the key.

void ServiceReferenceBase::GetPropertyKeys

(

std::vector< std::string > &

keys

)

const

Returns a list of the keys in the ServiceProperties object of the service referenced by this ServiceReferenceBase object.

This method will continue to return the keys after the service has been unregistered. This is so references to unregistered services can still be interrogated.

Parameters

keys	A vector being filled with the property keys.

void ServiceReferenceBase::GetUsingModules

(

std::vector< Module * > &

modules

)

const

Returns the modules that are using the service referenced by this ServiceReferenceBase object.

Specifically, this method returns the modules whose usage count for that service is greater than zero.

Parameters

modules

A list of modules whose usage count for the service referenced by this ServiceReferenceBase object is greater than zero.

bool ServiceReferenceBase::IsConvertibleTo

(

const std::string &

interfaceid

)

const

Checks wether this ServiceReferenceBase object can be converted to another ServiceReferenceBase object, which will be bound to the given interface identifier.

ServiceReferenceBase objects can be converted if the underlying service implementation was registered under multiple service interfaces.

Parameters

interfaceid

Returns

true if this ServiceReferenceBase object can be converted, false otherwise.

Referenced by ServiceReference< S >::ServiceReference().

ServiceReferenceBase::operator bool_type

(

)

const

Converts this ServiceReferenceBase instance into a boolean expression.

If this instance was default constructed or the service it references has been unregistered, the conversion returns false, otherwise it returns true.

bool ServiceReferenceBase::operator<

(

const ServiceReferenceBase &

reference

)

const

Compares this ServiceReferenceBase with the specified ServiceReferenceBase for order.

If this ServiceReferenceBase and the specified ServiceReferenceBase have the same service id they are equal. This ServiceReferenceBase is less than the specified ServiceReferenceBase if it has a lower service ranking and greater if it has a higher service ranking. Otherwise, if this ServiceReferenceBase and the specified ServiceReferenceBase have the same service ranking, this ServiceReferenceBase is less than the specified ServiceReferenceBase if it has a higher service id and greater if it has a lower service id.

Parameters

reference

The ServiceReferenceBase to be compared.

Returns

Returns a false or true if this ServiceReferenceBase is less than or greater than the specified ServiceReferenceBase.

ServiceReferenceBase& ServiceReferenceBase::operator=

(

std::nullptr_t

)

Releases any resources held or locked by this ServiceReferenceBase and renders it invalid.

Referenced by ServiceReference< S >::ServiceReference().

ServiceReferenceBase& ServiceReferenceBase::operator=

(

const ServiceReferenceBase &

reference

)

bool ServiceReferenceBase::operator==

(

const ServiceReferenceBase &

reference

)

const