Example: Declarative Configuration
Note:
The following description focuses on code snippets from the full code example, which is available at the /code-samples/src/ location in the installed product kit.
You can configure BigMemory Go declaratively, using an XML configuration file, or programmatically via the fluent configuration API. This sample shows how to configure a basic instance of BigMemory Go declaratively with the XML configuration file.
To configure BigMemory Go declaratively with an XML file, create a CacheManager instance, passing the a file name or an URL object to the constructor.
The following example shows how to create a CacheManager with an URL of the XML file in the classpath at /xml/ehcache.xml.
CacheManager manager = CacheManager.newInstance(
getClass().getResource("/xml/ehcache.xml"));
try {
Cache bigMemory = manager.getCache("BigMemory");
// now do stuff with it...
} finally {
if (manager != null) manager.shutdown();
}
Here are the contents of the XML configuration file used by this sample:
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
name="config">
<cache name="BigMemory"
maxBytesLocalHeap="512M"
maxBytesLocalOffHeap="32G"
copyOnRead="true"
statistics="true"
eternal="true">
</cache>
</ehcache>
The configuration element maxBytesLocalOffHeap lets you set how much off-heap memory to use. BigMemory Go ’s unique off-heap memory storage lets you use all of the memory available on a server in a single JVM—from gigabytes to multiple terabytes—without causing garbage collection pauses.