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Within a JSONStore one will find a set of "Documents". This might be a confusing name as they

should not be considered documents such as PDF, Word or Excel. Rather, in Worklight parlance,

a document is record or data structure. Each document consists of two primary parts:

• An ID field that is unique to the document

• A JavaScript object that is the content of the document

A second level of abstraction called a "Collection" is defined. A collection is a container of

documents. If one thinks of a document as a database row then a collection can be considered as

database table containing those rows.

One final abstraction exists which is that of the JSONStore "store". The store is a set of collections.

Following our database analogy, the store itself can be thought of as a database instance hosting all

the different collections which in turn host each of the documents.

Push Notification

It is not uncommon for a mobile application to request that a back-end system perform some work

on its behalf. What we now wish to look at is the converse of this … namely a back-end system

wishing to push information asynchronously to the mobile app. Examples of this would be

informing the application that a stock has reached a sell threshold or a new transaction has occurred

on a user's credit card.

IBM Worklight provides technology for handling such push notifications. Currently, the push

technology works with Android, iOS, and Windows Phone 8. The way the push actually happens is

a function of the device platform. For android it is Google Cloud Messaging (GCM), for iOS it is

Apple Push Notification Service (APNS) and for Windows Phone 8 it is the Microsoft Push

Notification Service (MPNS).

Testing

When building a solution, it is essential that it be tested often. Worklight provides a component

called the "Mobile browser simulator". What this is is a web application which runs the web

portions of your application in a browser. The browser shows the form factor of a variety of

named devices allowing you to see what your app will look like on a variety of different systems.

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Servis-Rhino 4211B Guía de usuario Pagina 62