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6.2.3. Using Protobuf with Hot Rod

Protobuf can be used with JBoss Data Grid's Hot Rod using the following two steps:
  1. Configure the client to use a dedicated marshaller, in this case, the ProtoStreamMarshaller. This marshaller uses the ProtoStream library to assist in encoding objects.

    Important

    In order to use the ProtoStreamMarshaller, the infinispan-remote-query-client Maven dependency must be added.
  2. Instruct ProtoStream library on how to marshall message types by registering per entity marshallers.
The following example describes how to use the ProtoStreamMarshaller to encode and marshall messages. 
import org.infinispan.client.hotrod.configuration.ConfigurationBuilder;
import org.infinispan.client.hotrod.marshall.ProtoStreamMarshaller;
import org.infinispan.protostream.SerializationContext;
ConfigurationBuilder clientBuilder = new ConfigurationBuilder();
clientBuilder.addServer()
    .host("127.0.0.1").port(11234)
    .marshaller(new ProtoStreamMarshaller());
    
RemoteCacheManager remoteCacheManager = new RemoteCacheManager(clientBuilder.build());
SerializationContext srcCtx = ProtoStreamMarshaller.getSerializationContext(remoteCacheManager);
serCtx.registerProtofile("/library.protobin");
serCtx.registerMarshaller(Book.class, new BookMarshaller());
serCtx.registerMarshaller(Author.class, new AuthorMarshaller());
// Book and Author classes omitted for brevity
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In the provided example,
  • The SerializationContext is provided by the ProtoStream library.
  • The SerializationContext.registerProtofile method receives the name of a classpath resource that is a serialized protobuf binary descriptor containing the type declarations. The binary descriptor, .protobin, is compiled with Protobuf's protoc generator tool using the 
    --descriptor_set_out
    Copy to Clipboard Toggle word wrap
    command line option for the library.proto file.
  • The SerializationContext associated with the RemoteCacheManager is obtained, then ProtoStream is instructed to marshall the protobuf types.

Note

A RemoteCacheManager has no SerializationContext associated with it unless it was configured to use ProtoStreamMarshaller.
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