ResourceManager Class Reference

The resource manager maintains kzb files and provides mechanisms to load resources from kzb files. More...

Classes
class	AcquireTask
	Load task for a group of resources. More...
interface	LoadTask
	Load task allows implementing custom asynchronous resource loading. More...
interface	ProtocolHandler
	ProtocolHandler allows implementing custom resource loading for a specific protocol. More...

Public Member Functions
AcquireTask	acquireResourcesAsync (String[] urls, AcquireTask.Callback callback)
	Creates a background task that loads and deploys all resources from a set of URLs. More...
void	addKzbFile (String fileName) throws FileNotFoundException
	Opens a kzb file from the file system and adds it to the list of files. More...
void	collectAndAcquirePrefabAsync (Node node, String id, AcquireTask.Callback callback)
	Creates a background task that collects all resources within a prefab and loads them asynchronously. More...
Domain	getDomain ()
	Returns the domain associated with the resource manager. More...
void	purge ()
	Deletes unreferenced resources. More...
void	registerProtocolHandler (String protocol, ProtocolHandler handler)
	Registers a protocol handler for loading resources specified with the given resource URL protocol (scheme name). More...
boolean	supportsProtocolHandler (String protocol)
	Checks whether the given resource URL protocol (scheme name) is registered as a protocol handler for the resource manager. More...
void	unregisterProtocolHandler (String protocol)
	Unregisters the protocol handler with the given resource URL protocol (scheme name). More...
void	wait (AcquireTask acquireTask)
	Blocks the execution until the async acquire task finishes and calls the callback of the task (unless it has been called already). More...

Detailed Description

The resource manager maintains kzb files and provides mechanisms to load resources from kzb files.

Member Function Documentation

acquireResourcesAsync()

AcquireTask acquireResourcesAsync	(	String []	urls,
		AcquireTask.Callback	callback
	)

Creates a background task that loads and deploys all resources from a set of URLs.

After Kanzi loads and deploys the resource, the function calls the callback you provide.

Parameters

urls	Array of resource URLs.
callback	Callback function that this function calls when resource loading is completed.

Returns

Handle to the async load task. You can pass the handle to ResourceManager#wait(AcquireTask) to wait for the completion of the load.

addKzbFile()

void addKzbFile

(

String

fileName

)

throws FileNotFoundException

Opens a kzb file from the file system and adds it to the list of files.

Parameters

fileName

The name of the file to open.

Exceptions

InvalidKzbFileException	Throws an InvalidKzbFileException when the KZB file is invalid.
FileNotFoundException	Throws a FileNotFoundException when the KZB file is not found.

collectAndAcquirePrefabAsync()

void collectAndAcquirePrefabAsync	(	Node	node,
		String	id,
		AcquireTask.Callback	callback
	)

Creates a background task that collects all resources within a prefab and loads them asynchronously.

After Kanzi loads and deploys all resources, the function calls the callback you provide.

Parameters

node	Node where to instantiate the prefab, and the node to resolve from.
id	Resource id of the prefab.
callback	Callback function that this function calls when resource loading is completed.

getDomain()

Domain getDomain

(

)

Returns the domain associated with the resource manager.

Returns

Reference to associated domain instance.

purge()

void purge

(

)

Deletes unreferenced resources.

You can use this function to free memory. Destroys all resources that are referenced only by the resource manager.

registerProtocolHandler()

void registerProtocolHandler	(	String	protocol,
		ProtocolHandler	handler
	)

Registers a protocol handler for loading resources specified with the given resource URL protocol (scheme name).

Parameters

protocol	The protocol name. For example, "http".
handler	The protocol handler. Kanzi calls this function when you use a URL with the given protocol, and Kanzi does not find an existing resource with that URL. This loader function creates a resource.

Exceptions

IllegalStateException

Throws an IllegalStateException when the protocol has already been registered.

supportsProtocolHandler()

boolean supportsProtocolHandler

(

String

protocol

)

Checks whether the given resource URL protocol (scheme name) is registered as a protocol handler for the resource manager.

Parameters

protocol

The protocol to check.

Returns

True if the protocol is registered, otherwise False.

unregisterProtocolHandler()

void unregisterProtocolHandler

(

String

protocol

)

Unregisters the protocol handler with the given resource URL protocol (scheme name).

Parameters

protocol

The protocol name.

wait()

void wait

(

AcquireTask

acquireTask

)

Blocks the execution until the async acquire task finishes and calls the callback of the task (unless it has been called already).

Parameters

acquireTask

Acquire task created from ResourceManager#acquireResourcesAsync.