17.2. Performing Remote Queries via the Hot Rod Java Client

Procedure 17.1. Enabling Remote Querying via Hot Rod

1. Add the infinispan-remote.jar

   The infinispan-remote.jar is an uberjar, and therefore no other dependencies are required for this feature.

2. Enable indexing on the cache configuration.

   Indexing is not mandatory for Remote Queries, but it is highly recommended because it makes searches on caches that contain large amounts of data significantly faster. Indexing can be configured at any time. Enabling and configuring indexing is the same as for Library mode.
   Add the following configuration within the cache-container element loated inside the Infinispan subsystem element.

   <!-- A basic example of an indexed local cache 
       that uses the RAM Lucene directory provider -->
   <local-cache name="an-indexed-cache" start="EAGER">                       
       <!-- Enable indexing using the RAM Lucene directory provider -->
       <indexing index="ALL">
           <property name="default.directory_provider">ram</property>
       </indexing>     
   </local-cache>

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3. Register the Protobuf schema definition files

   Register the Protobuf schema definition files by adding them in the ___protobuf_metadata system cache. The cache key is a string that denotes the file name and the value is .proto file, as a string. Alternatively, protobuf schemas can also be registered by invoking the registerProtofile methods of the server's ProtobufMetadataManager MBean. There is one instance of this MBean per cache container and is backed by the ___protobuf_metadata, so that the two approaches are equivalent.
   For an example of providing the protobuf schema via ___protobuf_metadata system cache, see Example 17.8, “Registering a Protocol Buffers schema file”.
   The following example demonstrates how to invoke the registerProtofile methods of the ProtobufMetadataManager MBean.

   Example 17.1. Registering Protobuf schema definition files via JMX

   import javax.management.MBeanServerConnection;
   import javax.management.ObjectName;
   import javax.management.remote.JMXConnector;
   import javax.management.remote.JMXServiceURL;
   
   ...
   
   String serverHost = ...         // The address of your JDG server
   int serverJmxPort = ...         // The JMX port of your server
   String cacheContainerName = ... // The name of your cache container
   String schemaFileName = ...     // The name of the schema file
   String schemaFileContents = ... // The Protobuf schema file contents
   
   JMXConnector jmxConnector = JMXConnectorFactory.connect(new JMXServiceURL(
       "service:jmx:remoting-jmx://" + serverHost + ":" + serverJmxPort));
   MBeanServerConnection jmxConnection = jmxConnector.getMBeanServerConnection();
   
   ObjectName protobufMetadataManagerObjName = 
       new ObjectName("jboss.infinispan:type=RemoteQuery,name=" + 
       ObjectName.quote(cacheContainerName) + 
       ",component=ProtobufMetadataManager");
   
   jmxConnection.invoke(protobufMetadataManagerObjName, 
                        "registerProtofile", 
                        new Object[]{schemaFileName, schemaFileContents}, 
                        new String[]{String.class.getName(), String.class.getName()});
   jmxConnector.close();
   

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