Client side API

[tshemsedinov]

We need to prepare globalstorage for running in browser and provide API for front-end application. So first implementation will be simple, just selecting from categories but it will return MemoryCursors.

Creating new cursor client-side globalstorage instance will pass query to server-side globalstorage instance and then it will create MemoryCursor from whole (not filtered) dataset holding in memory or from StorageProvider reading data from persistent storage. After that we will have client-side MemoryCursor connected with server-side MemoryCursor. Client-side MemoryCursor:

• should hold dataset in memory (if it will be large 100 records we can send to the client first 100 records and total count, then send data bunches on request)
• should hold metadata/schema of the dataset (not all fields, we need to filter schemas)
• should pass operations to server-side MemoryCursors
• server-side MemoryCursors should pass operations to not filtered MemoryCursor for memory caching and to StorageProvider for persistent storage