BackendFactory

This class is a factory that provides concrete implementations of the Backend abstract class.

See also

BackendService, Backend, SyncBackend, AsyncBackend, and ContextFactory.

Methods

Public methods

• BackendFactory$get()

• BackendFactory$clone()

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Method get()

Obtain a concrete implementation of the abstract Backend class of the specified type.

Usage

BackendFactory$get(type)

Arguments

type

A character string specifying the type of the Backend to instantiate. Possible values are "sync" and "async". See the Details section for more information.

Details

When type = "sync" a SyncBackend instance is created and returned. When type = "async" an AsyncBackend instance is provided instead.

Returns

A concrete implementation of the class Backend. It throws an error if the requested backend type is not supported.

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Method clone()

The objects of this class are cloneable with this method.

Usage

BackendFactory$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

# Create a backend factory.
backend_factory <- BackendFactory$new()

# Get a synchronous backend instance.
backend <- backend_factory$get("sync")

# Check the class of the backend instance.
class(backend)
#> [1] "SyncBackend"    "Backend"        "BackendService" "R6"            

# Get an asynchronous backend instance.
backend <- backend_factory$get("async")

# Check the class of the backend instance.
class(backend)
#> [1] "AsyncBackend"   "Backend"        "BackendService" "R6"