Context class is used to manage all client side objects that are related either to connectivity or services. More...

#include <context.hpp>

Public Types
typedef function< void(shared_ptr< void > handler, const string &resourceUri, bool result)	ResourceLoadedCallback)

typedef function< AbstractServiceClientSharedPtr(ClientSharedPtr, const string &)	ServiceCreationFunction)
	A function callback type that is invoked when a registered service needs to be instantiated.

Public Member Functions
ResourceSharedPtr	acquireResourceAsync (string resourceUri, shared_ptr< void > handler, ResourceLoadedCallback resourceLoadedCallback, size_t retryCount=5, unsigned int retryIntervalMs=5000)
	Request loading remote resource using the server attached to this instance of Context.

template<class T >
shared_ptr< T >	acquireService ()
	Provides type-safe access to service.

template<class T >
shared_ptr< T >	acquireService (const string &identifier)
	Provides type-safe access to service instance.

AbstractServiceClientSharedPtr	acquireService (const string &identifier, ServiceCreationFunction creator)
	Provides access to service.

template<class T >
kanzi::shared_ptr< T >	acquireService (Domain &domain)

	Context ()
	Constructor.

ClientSharedPtr	getClient () const
	Access to client, which is used to connect to server.

int	getContextValue (int key, int defaultValue=0)
	Retrieves a free format value for a specific key.

string	getFileServerAddress () const
	Returns IP address of the remote file server.

string	getName () const
	Access to name of the connected client.

string	getResourceDirectory () const
	Returns directory where local resources are stored.

bool	registerConnectionAdapter (const string &identifier, ConnectionAdapterCreateFunc creator)
	Registers new connection adapter type into context.

template<class T >
void	registerService ()
	Convenience function to register service creators.

void	registerService (const string &identifier, ServiceCreationFunction creator)
	Registers service type to context.

void	releaseService (const string &identifier)
	Ask context to release its handle to a service.

void	setContextValue (int key, int value)
	Stores a key-value pair into the context.

void	setServiceEnabledState (const string &serviceIdentifier, bool enabled)
	Enable/disable the specified service.

bool	unregisterConnectionAdapter (const string &identifier)
	Unregister connection adapter from context.

void	unregisterService (const string &identifier)
	Unregister service type from context.

	~Context ()
	Destructor.

Static Public Member Functions
template<class T >
static shared_ptr< T >	acquireService (Domain &domain)

static ContextSharedPtr	createOrFetchInstance (Domain &domain, const string &serverName)
	Create or fetch a context instance This function will create a new context if one does not yet exist.

static ContextSharedPtr	findContextForService (Domain &domain, const string &serviceIdentifier)
	Provides access for the client-side context instance for registered service.

static ContextSharedPtr	instance (Domain &domain, const string &serverName)
	Provides access for the client-side context instance.

static void	notifyResourceLoadingResult (Domain *domain, const string &uri, bool result)
	Notify resource loading status. Called by framework.

static bool	registerConnectionAdapterCreator (const string &identifier, ConnectionAdapterCreateFunc creator)
	Register creator for connection adapters Each Context constructor will use these to actually register the connection adapters to client.

static void	registerServiceToServerConnection (const string &serviceIdentifier, const string &serverName)
	Register certain service to be handled by specified server.

static void	releaseService (Domain &domain, const string &identifier)
	Ask context to release its handle to a service.

Detailed Description

Context class is used to manage all client side objects that are related either to connectivity or services.

Member Typedef Documentation

◆ ResourceLoadedCallback

typedef function<void(shared_ptr<void> handler, const string& resourceUri, bool result) kanzi::connect::Context::ResourceLoadedCallback)

◆ ServiceCreationFunction

typedef function<AbstractServiceClientSharedPtr(ClientSharedPtr, const string&) kanzi::connect::Context::ServiceCreationFunction)

A function callback type that is invoked when a registered service needs to be instantiated.

Constructor & Destructor Documentation

◆ ~Context()

kanzi::connect::Context::~Context ( )

Destructor.

◆ Context()

kanzi::connect::Context::Context ( )

Constructor.

One instance of this class should be created (per connected server). During the application start-up, the Kanzi runtime plug-ins are loaded and an instance of the Context class is instantiated per server. Usually this is created by the plugin that is loaded first and then instance() function can be used to access / share it elsewhere.

Member Function Documentation

◆ acquireResourceAsync()

ResourceSharedPtr kanzi::connect::Context::acquireResourceAsync	(	string	resourceUri,
		shared_ptr< void >	handler,
		ResourceLoadedCallback	resourceLoadedCallback,
		size_t	retryCount = 5,
		unsigned int	retryIntervalMs = 5000 )

Request loading remote resource using the server attached to this instance of Context.

Parameters

resourceUri	Resource identifier.
handler	Handler to be passed to callback. Is used for ensuring the validity of callback.
resourceLoadedCallback	Callback to be called when operation completes.
retryCount	Count of the retries if loading fails. This is common for all requests for same resource uri.
retryIntervalMs	Time, in milli seconds, to wait before retrying resource loading.

Returns: pointer to resource if resource has been previously loaded, nullptr otherwise.

◆ acquireService() [1/5]

template<class T >

shared_ptr< T > kanzi::connect::Context::acquireService ( )

inline

Provides type-safe access to service.

Returns: Pointer to service.

◆ acquireService() [2/5]

template<class T >

shared_ptr< T > kanzi::connect::Context::acquireService ( const string & identifier )

inline

Provides type-safe access to service instance.

Parameters

identifier Identifier of the new service instance, usually equals to Service::TYPE.

Returns: Pointer to service.

◆ acquireService() [3/5]

AbstractServiceClientSharedPtr kanzi::connect::Context::acquireService	(	const string &	identifier,
		ServiceCreationFunction	creator )

Provides access to service.

Parameters

identifier	Identifier of the service instance, usually equals to Service::TYPE.
creator	A callback function that can be used to construct an instance of the service.

Returns: Pointer to service.

◆ acquireService() [4/5]

template<class T >

static shared_ptr< T > kanzi::connect::Context::acquireService ( Domain & domain )

static

◆ acquireService() [5/5]

template<class T >

kanzi::shared_ptr< T > kanzi::connect::Context::acquireService ( Domain & domain )

inline

◆ createOrFetchInstance()

static ContextSharedPtr kanzi::connect::Context::createOrFetchInstance	(	Domain &	domain,
		const string &	serverName )

static

Create or fetch a context instance This function will create a new context if one does not yet exist.

Use this version only in places where creating new context instance is allowed. For normal instance access use the Context::instance method

Parameters

domain	Kanzi UI Domain that is used to host all Kanzi Connect runtime plugins.
serverName	Identifies which server configuration to use

Returns: Shared pointer to Context.

◆ findContextForService()

static ContextSharedPtr kanzi::connect::Context::findContextForService	(	Domain &	domain,
		const string &	serviceIdentifier )

static

Provides access for the client-side context instance for registered service.

Parameters

domain	Kanzi UI Domain that is used to host all Kanzi Connect runtime plugins.
serviceIdentifier	Registered service.

Returns: Shared pointer to Context.

◆ getClient()

ClientSharedPtr kanzi::connect::Context::getClient ( ) const

Access to client, which is used to connect to server.

Returns: Client instance.

◆ getContextValue()

int kanzi::connect::Context::getContextValue	(	int	key,
		int	defaultValue = 0 )

Retrieves a free format value for a specific key.

Parameters

key	identifies to object to retrieve.

Returns: value that was found or provided default value otherwise. (default defaults to 0).

◆ getFileServerAddress()

string kanzi::connect::Context::getFileServerAddress ( ) const

Returns IP address of the remote file server.

Returns: IP address of the remote file server.

◆ getName()

string kanzi::connect::Context::getName ( ) const

Access to name of the connected client.

Returns: Name of this client.

◆ getResourceDirectory()

string kanzi::connect::Context::getResourceDirectory ( ) const

Returns directory where local resources are stored.

Returns: File path to local resource folder.

◆ instance()

static ContextSharedPtr kanzi::connect::Context::instance	(	Domain &	domain,
		const string &	serverName )

static

Provides access for the client-side context instance.

Never creates the instance

Parameters

domain	Kanzi UI Domain that is used to host all Kanzi Connect runtime plugins.
serverName	Identifies which server configuration to use

Returns: Shared pointer to Context. Null if not found

◆ notifyResourceLoadingResult()

static void kanzi::connect::Context::notifyResourceLoadingResult	(	Domain *	domain,
		const string &	uri,
		bool	result )

static

Notify resource loading status. Called by framework.

◆ registerConnectionAdapter()

bool kanzi::connect::Context::registerConnectionAdapter	(	const string &	identifier,
		ConnectionAdapterCreateFunc	creator )

Registers new connection adapter type into context.

Context must not have been started when registering new adapter.

Parameters

identifier	Identifier of the connection adapter. This name needs to match with the ones in configuration files.
creator	Function that instantiates a connection adapter of given type.

Returns: true if registration was successful

◆ registerConnectionAdapterCreator()

static bool kanzi::connect::Context::registerConnectionAdapterCreator	(	const string &	identifier,
		ConnectionAdapterCreateFunc	creator )

static

Register creator for connection adapters Each Context constructor will use these to actually register the connection adapters to client.

Parameters

identifier	Identifies the connection adapter
creator	The factory method to construct the connection adapter

Returns: True if the creator was registered successfully

◆ registerService() [1/2]

template<class T >

void kanzi::connect::Context::registerService ( )

inline

Convenience function to register service creators.

◆ registerService() [2/2]

void kanzi::connect::Context::registerService	(	const string &	identifier,
		ServiceCreationFunction	creator )

Registers service type to context.

Parameters

identifier	Identifier of the service. In most cases this matches with type of a service.
creator	Function that instantiates a new service of given type.

◆ registerServiceToServerConnection()

static void kanzi::connect::Context::registerServiceToServerConnection	(	const string &	serviceIdentifier,
		const string &	serverName )

static

Register certain service to be handled by specified server.

Parameters

serviceIdentifier	Identifies the service
serverName	Identifies the server

◆ releaseService() [1/2]

void kanzi::connect::Context::releaseService ( const string & identifier )

Ask context to release its handle to a service.

If there no other users for the service service will be released.

Parameters

identifier Identifier of the service instance, usually equals to Service::TYPE.

◆ releaseService() [2/2]

static void kanzi::connect::Context::releaseService	(	Domain &	domain,
		const string &	identifier )

static

Ask context to release its handle to a service.

If there no other users for the service service will be released.

Parameters

identifier Identifier of the service instance, usually equals to Service::TYPE.

◆ setContextValue()

void kanzi::connect::Context::setContextValue	(	int	key,
		int	value )

Stores a key-value pair into the context.

Parameters

key	the key to identify the value
value	the value to save.

◆ setServiceEnabledState()

void kanzi::connect::Context::setServiceEnabledState	(	const string &	serviceIdentifier,
		bool	enabled )

Enable/disable the specified service.

Parameters

serviceIdentifier	Identifies the service to enable/disable
enabled	True enables and false disables the service

◆ unregisterConnectionAdapter()

bool kanzi::connect::Context::unregisterConnectionAdapter ( const string & identifier )

Unregister connection adapter from context.

Context must not have been started when unregistering an adapter.

Parameters

identifier Identifier of the connection adapter.

◆ unregisterService()

void kanzi::connect::Context::unregisterService ( const string & identifier )

Unregister service type from context.

Parameters

identifier Identifier of the service.

The documentation for this class was generated from the following file:

connect/kanzi_adaptation/context.hpp

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Typedef Documentation

◆ ResourceLoadedCallback

◆ ServiceCreationFunction

Constructor & Destructor Documentation

◆ ~Context()

◆ Context()

Member Function Documentation

◆ acquireResourceAsync()

◆ acquireService() [1/5]

◆ acquireService() [2/5]

◆ acquireService() [3/5]

◆ acquireService() [4/5]

◆ acquireService() [5/5]

◆ createOrFetchInstance()

◆ findContextForService()

◆ getClient()

◆ getContextValue()

◆ getFileServerAddress()

◆ getName()

◆ getResourceDirectory()

◆ instance()

◆ notifyResourceLoadingResult()

◆ registerConnectionAdapter()

◆ registerConnectionAdapterCreator()

◆ registerService() [1/2]

◆ registerService() [2/2]

◆ registerServiceToServerConnection()

◆ releaseService() [1/2]

◆ releaseService() [2/2]

◆ setContextValue()

◆ setServiceEnabledState()

◆ unregisterConnectionAdapter()

◆ unregisterService()