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Off-line Storage

One of the core architectural concepts that distinguish mobile apps from other types of app is that

they are only transiently connected to a network. There is no assurance that at any given time they

have access to a network. If an application is reliant on data this can result in the application being

unable to be used while off-line. A solution to this is to provide off-line storage of data such that

when the application is on-line, it can retrieve some set of data that the end user can use to do work

and save it locally. If the app subsequently becomes network isolated, the app can still work (to

some degree) using the local data that it previously stored.

The Worklight JSONStore

Worklight provides a concept called JSONStore. This is a component that executes client-side

within the context of a client app. It provides a storage abstraction that can be used by application

to store and retrieve data.

It provides the following high level features each of which will be discussed in more detail in later

sections.

• Data encryption

• Storage space only constrained by available storage space

• Worklight adapter integration

By default, the JSONStore functions are not included in an application and must be explicitly added

to be utilized.

We can do this through the application-descriptor editor. Open the editor and select "Optional

Features". Next click the Add... button to add a feature:

Once added it will show in the added features list:

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