Mig-infocom MiG Calendar DBConnect Guide Manual de usuario descargar pdf (Pagina 18)

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Monitoring the Database Queue

DBConnect uses a background thread to communicate with the

database. This ensures that there will be no lags or lockups of the

user interface when information is persisted to the database. There

are multiple ways you as the developer can interact with this queue.

You can check the length of the queue, wait for it to flush, shut it down

as well as check its contents.

DataSynchronizer is in many ways the focal point of DBConnect

while it is running. Through that class you can monitor the database

queue including starting and stopping it.

You can also add a listener on the database queue that will be notified

every time the queue count is changed.

View the DataSynchronizer JavaDoc for details on how to use

this class.

Filtering What to Synchronize

Since you might want to have activities/categories in your memory,

and thus the depositories, that you want to exclude from DBConnect

you can create and set a CRUDSFilter that filters which object to

do Create, Read, Update, Delete and Synchronize on respectively.

You create the filter by sub classing CRUDSFilter and implement

the single abstract method accept(Object o, int

operation).

View the CRUDSFilter JavaDoc for details on how to use this class.

Polling and Setting Auto-poll Interval

The DataSynchronizer can check the database for changes

(polling) automatically every X milliseconds.

View the DataSynchronizer JavaDoc for details on how to use

this class.

Auto Write

This is a property of the DataSynchronizer. It is used to turn on

and off the automatic monitoring of changes to activities/categories. If

this property is set to false DBConnect will not pick up changes and

they will thus not be handled and persisted.

View the DataSynchronizer JavaDoc for details on how to use

this class.

Managing Shutdown and Flushing

You can flush the database queue and wait for it to finish, optionally a

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Mig-infocom MiG Calendar DBConnect Guide Manual de usuario Pagina 18