Chapter 42. Configuring Media Types

The default media type is application/octet-stream for both keys and values with the following exceptions:

Red Hat JBoss Data Grid lets clients read and write data in different formats and automatically converts between formats.

JBoss Data Grid supports several data formats that are interchangeable with one another, as follows:

JBoss Data Grid also supports data formats that it must convert to and from the data formats in the preceding list, as follows:

In addition, JBoss Data Grid supports conversion between application/x-protostream and application/json.

The following is an example configuration that defines the media type for keys and values:

<cache>
   <encoding>
      <key media-type="application/x-java-object; type=java.lang.Integer"/>
      <value media-type="application/xml; charset=UTF-8"/>
   </encoding>
</cache>

Use the ConfigurationBuilder interface to programmatically configure the media type, as in the following example:

ConfigurationBuilder cfg = new ConfigurationBuilder();

cfg.encoding().key().mediaType("text/plain");
cfg.encoding().value().mediaType("application/json");

You can programmatically override the media type that is configured for the cache, as in the following example:

DefaultCacheManager cacheManager = new DefaultCacheManager();

// The cache will store POJO for keys and values
ConfigurationBuilder cfg = new ConfigurationBuilder();
cfg.encoding().key().mediaType("application/x-java-object");
cfg.encoding().key().mediaType("application/x-java-object");

cacheManager.defineConfiguration("mycache", cfg.build());

Cache<Integer, Person> cache = cacheManager.getCache("mycache");

cache.put(1, new Person("John","Doe"));

// Wraps cache using 'application/x-java-object' for keys but JSON for values.
cache.getAdvancedCache().withMediaType("application/x-java-object", "application/json");

byte[] json = cache.get(1);

This configuration returns the value in JSON format, as follows:

{
   "_type":"org.infinispan.sample.Person",
   "name":"John",
   "surname":"Doe"
}