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How to use Flex 3 & Cairngorm with LiveCycle Data Services 2.6 (Flex Camp Boston 2008)

How to use Flex 3 & Cairngorm with LiveCycle Data Services 2.6
Brian O'Connor, Universal Mind

Material is on his website. Going to cover what it takes to develop with these technologies today, versus the brave new world that the other Adobe folk presented earlier.

Only a couple of people have used LCDS. About half the audience have used Cairngorm. Really looking to remove a lot code that you have to write.

BlazeDS versus LCDS: Data management only in LCDS and has better Service Adapters.

What is data management: Need paging, collaboration, automated CRUD, offline capabilities. Client has data service that connects to destination on server that uses an adapter.

Fill method gets all data from data source and caches it in middle tier and paged to client. Have the ability to control auto commit of changes to the data. Page fill gets only a subset of data at once. Can configure the fill type to use. How you program your adapter to execute it is a hot topic of performance consideration. refreshFill() can be a performance bottleneck. Is determined by the return value of method calls. For example 4000 clients shouldn't all refresh their data at once.

Data grid and data service cooperate to only request new data when needed (i.e. when user scrolls down).

Dispatch event, front controller, service locator, response populates data or view. Get garbage collected which isn't what you want. One class per data service with a manager. Have Singleton for getting access to the method.

Data Service Transactions handle multiple different access methods. Can start transactions on destinations with either commit or rollback after a bunch of changes. Can hookup with JTA. External updates to database aren't reflected to clients. Better to code in middle tier so that it can participate in refreshing clients.

Can also use data services to persist it to AIR SQLite database. Data service has saveToCache method (which is asynchronous). Don't have autoSaveToCache set to true. With a 4 level deep object hierarchy and 4000 rows it takes about 10 seconds to save. Hard to tell when your data is finished loading (fill is problematic). Have to daisy chain clearCache calls when working with multiple data managers. Client sometimes see managed object proxy instead of strongly typed wrappers. need to add properties.

Data manager handles sending back conflict events. Can determine how it gets resolved.

No built in locking support.

Tags: cairngorm flex flexcampboston2008 lcds

Comments

Hi, I would like to know whether autoSaveCache uses SQLLite of AIR to save the data?

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