factories to create DataSystemInitializers, in priority order.
factories to create DataSystemSynchronizers, in priority order.
factories to fallback to if we need to fallback to FDv1.
Optional _logger: LDLoggerfor logging
Optional to control automated transition between datasources. Typically only used for testing.
to control delay between transitions. Typically only used for testing.
Private Readonly _backoffto control delay between transitions. Typically only used for testing.
Private _cancelPrivate _externalPrivate Optional _externalPrivate _fdv1Private _initPrivate _initPrivate Optional Readonly _loggerfor logging
Private _stoppedPrivate _syncPrivate Readonly _transitionto control automated transition between datasources. Typically only used for testing.
Private _cancellablePrivate _consumePrivate _lookupthe transition condition for the provided data source state or undefined if there is no transition condition
Private _pickDetermines the next datasource and returns that datasource as well as a closure to cull the datasource from the datasource lists. One example where the cull closure is invoked is if the datasource has an unrecoverable error.
Optional transition: TransitionOptional Private _resetPrivate _wrapThis wrapper will ensure the following:
Don't report DataSourceState.Initializing except as first status callback. Map underlying DataSourceState.Closed to interrupted. Don't report the same status and error twice in a row.
Optional err: anyOptional This wrapper will ensure the following:
Don't report DataSourceState.Initializing except as first status callback. Map underlying DataSourceState.Closed to interrupted. Don't report the same status and error twice in a row.
Optional err: anyOptional May be called any number of times, if already started, has no effect
that will be called when data arrives, may be called multiple times.
that will be called when data source state changes or an unrecoverable error has been encountered.
Optional err: anyOptional Optional selectorGetter: (() => undefined | string)that can be invoked to provide the FDv2 selector/basis if one exists
Optional
Generated using TypeDoc
The CompositeDataSource can combine a number of DataSystemInitializers and DataSystemSynchronizers into a single DataSource, implementing fallback and recovery logic internally to choose where data is sourced from.