Example: Reloading a map with the ClientLoader interface

Reloading a map is the same as preloading a map, except that the isPreload argument is set to false in the ClientLoader.load method.

Client-based reload example

The following sample shows how to reload maps. Compared to the preload sample, the main difference is that a loadSql and parameters are provided. This sample only reloads the Customer data with an ID between 1000 and 2000. The isPreload parameter on the load method is set to false.

// Get the StateManager 
StateManager stateMgr = StateManagerFactory.getStateManager();

// Set ObjectGrid state to PRELOAD before calling ClientLoader.loader
stateMgr.setObjectGridState(AvailabilityState.PRELOAD, objectGrid);

ClientLoader c = ClientLoaderFactory.getClientLoader();

// Load the data
String loadSql = "select c from CUSTOMER c 
    where c.custId >= :startCustId and c.custId < :endCustId ";
Map<String, Long> params = new HashMap<String, Long>();
params.put("startCustId", 1000L);
params.put("endCustId", 2000L);

c.load(objectGrid, "CUSTOMER", "customerPU", null, null, 
    loadSql, params, false, null);

// Set ObjectGrid state back to ONLINE
stateMgr.setObjectGridState(AvailabilityState.ONLINE, objectGrid);

Remember: This query string observes both JPA query syntax and eXtreme Scale entity query syntax. This query string is important because it runs twice: to invalidate the matched ObjectGrid entities and to load the matched JPA entities.