To build functional and performant mobile apps, the back-end data services need to be optimized for mobile consumption. RESTful web services using JSON as payload format are widely considered as the best architectural choice for integration between mobile apps and back-end systems. At the same time, many existing enterprise back-end systems provide a SOAP-based web service application programming interface (API). In this article series we will discuss how Oracle Mobile Cloud Service (MCS) can be used to transform these enterprise system interfaces into a mobile-optimized REST-JSON API. This architecture layer is sometimes referred to as Mobile Backend as a Service (MBaaS). A-Team has been working on a number of projects using MCS to build this architecture layer. We will explain step-by-step how to build an MBaaS, and we will share tips, lessons learned and best practices we discovered along the way. No prior knowledge of MCS is assumed. In part 1 we discussed the design of the REST API, in part 2 we covered the implementation of the “read” (GET) resources, in part 3 we discussed implementation of the “write” resources (POST,PUT and DELETE). In this fourth part, we will look at how we can use MCS Storage collections to cache payloads, and while doing so, we will use some more advanced concepts like chaining promises to execute multiple REST calls in sequence.
In this article we will implement the GET /jobs endpoint which returns a list of jobs. This list is static, and as such can be cached within MCS to reduce the number of backend calls and speed up overall performance. Obviously, app developers can also choose to cache this list on the mobile device to further enhance performance, but that is beyond the scope of this article. We will use the MCS Storage API to store and retrieve the cached list of jobs. We will use a boolean query parameter refreshCache to force an update of the jobs list in storage.
Setting up the Storage Collection
To store files in MCS, a so-called storage collection must be created. Access to a storage collection is handled through roles. When creating a new storage collection, you assign roles that have read and/or write privileges. Users with the appropriate role(s) can then store files in the collection and/or retrieve them. So, we first create a role named HRManager, by clicking on the Mobile User Management menu option, select the Roles tab, and then click on New Role.
After creating the role, we select the Storage menu option and click on New Collection to create the collection. Read the complete article here.
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