DataSourceStatus

Enumeration

All data source status is here, including data source instance status and data status (for QueriableDataSource).

  • Instance status includes: NotCreated, Created, CreateError.
    When a data source is requested to be created, it is set to NotCreated at first. If a data source has never been used, there is no data source status.
  • Data status includes: NotReady, Unloaded, Loading, Loaded, LoadError.
    When a QueriableDataSource is created, it is set as NotReady or Unloaded at first. If the data source is generated by widgets, the initial status will be NotReady, otherwise the initial status will be Unloaded. When widgets are ready to generate data, that is to say, the data source is ready to do query, widgets will change the status from NotReady to Unloaded. When widgets are not ready to generate data, widgets will change the status back to NotReady, then framework will help to clear source records, records and cache in data source instance. If load() is invoked, it will be set as Loading. If data is returned, it will be set as Loaded. If an error occurs, it will be set as LoadError.

Enumeration members

CreateError
CreateError = "CREATE_ERROR"
Created
Created = "CREATED"
LoadError
LoadError = "LOAD_ERROR"
Loaded
Loaded = "LOADED"
Loading
Loading = "LOADING"
NotCreated
NotCreated = "NOT_CREATED"
NotReady
NotReady = "NOT_READY"

NotReady is for widget output data source only. When output data source instance is created, the data is not ready for use. Widget should dispatch an action (DataSourceStatusChanged) to make the data source ready for use. If a data source status is not ready, the query should return an empty result.

Unloaded
Unloaded = "UNLOADED"

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