This topic explains how to manage a client cache in VMware GemFire.
You have several options for client cache configuration. Start your client cache using a combination of XML declarations and API calls. Close the client cache when you are done.
Note: VMware GemFire automatically configures the cluster for your
ClientCache as standalone, which means the client has no peers. Do not try to set the
locators for a client application or the system will throw an exception.
Create your client cache:
cache.xml, use the
client-cache DOCTYPE and configure your cache inside a
<client-cache> element. Configure your server connection pool and your regions as needed. Example:
<?xml version="1.0" encoding="UTF-8"?> <client-cache xmlns="http://geode.apache.org/schema/cache" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://geode.apache.org/schema/cache http://geode.apache.org/schema/cache/cache-1.0.xsd" version="1.0"> <pool name="serverPool"> <locator host="host1" port="44444"/> </pool> <region name="exampleRegion" refid="PROXY"/> </client-cache>
Note: Applications that use a
client-cache may want to set
concurrency-checks-enabled to false for a region in order to see all events for that region. VMware GemFire server members can continue using concurrency checks, but they will pass all events to the client cache. This configuration ensures that the client sees all region events, but it does not prevent the client cache region from becoming out-of-sync with the server cache. See Consistency for Region Updates.
If you use multiple server pools, configure the pool name explicitly for each client region. Example:
<pool name="svrPool1"> <locator host="host1" port="40404"/> </pool> <pool name="svrPool2"> <locator host="host2" port="40404"/> </pool> <region name="clientR1" refid="PROXY" pool-name="svrPool1"/> <region name="clientR2" refid="PROXY" pool-name="svrPool2"/> <region name="clientsPrivateR" refid="LOCAL"/>
In your Java client application, create the cache using the
create method. Example:
ClientCache clientCache = new ClientCacheFactory().create();
This creates the server connections and initializes the client’s cache according to your
Close your cache when you are done using the
close method of your
If your client is durable and you want to maintain your durable queues while the client cache is closed, use: