Using A Cache Loader
Introduction
This is a simple example that demonstrates loading values using a VMware GemFire CacheLoader.
This is a simple example that demonstrates loading values using a CacheLoader. Invoking Region.get() causes the CacheLoader to produce a value that is stored in the region. This approach is commonly used to fetch data from other systems like a database.
This example assumes you have installed JDK11 and GemFire.
Steps
From the gemfire-examples/loader directory, build the example and run unit tests
$ ../gradlew build
Next start the locator and two servers
$ gfsh run --file=scripts/start.gfshRun the example to load the entries
$ ../gradlew run
The example fetches the entries twice. The first retrieval is slow, simulating a network call. Subsequent retrievals are much faster since the values are stored in the cache. The loader logs requests into the GemFire server logs. You can find those at build/server1/server1.log or build/server2/server2.log.
Shut down the system:
$ gfsh run --file=scripts/stop.gfsh