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7.2. Performing Remote Queries via the Hot Rod Java Client

Remote querying over Hot Rod can be enabled once the RemoteCacheManager has been configured with the Protobuf marshaller.
The following procedure describes how to enable remote querying over its caches.
Prerequisites

RemoteCacheManager must be configured to use the Protobuf Marshaller.

Procedure 7.1. Enabling Remote Querying via Hot Rod

  1. Add All Relevant Dependencies

    See the infinispan-client-hotrod dependencies in the runtime-classpath.txt file in the JBoss Data Grid Library distribution for a full list of required dependencies.

  2. Enable indexing on the cache configuration.

    Indexing is not mandartory 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.

  3. Register the Protobuf Binary Descriptor

    Register the Protobuf binary descriptor by invoking the registerProtofile method of the server's ProtobufMetadataManager MBean. There is one instance of this per cache container configuration element of the server.
Result

All data placed in the cache is immediately searchable, whether or not indexing is in use. Entries do not need to be annotated, unlike embedded queries. The entity classes are only meaningful to the Java client and do not exist on the server.

Once remote querying has been enabled, the QueryFactory can be obtained using the following:

Example 7.1. Obtaining the QueryFactory

import org.infinispan.client.hotrod.Search;
import org.infinispan.query.dsl.QueryFactory;
import org.infinispan.query.dsl.Query;
...
remoteCache.put(2, new User("John", "Doe", 33));
QueryFactory qf = Search.getQueryFactory(remoteCache);
Query query = qf.from(User.class)
    .having("name").eq("John")
    .toBuilder().build();
List list = query.list();
assertEquals(1, list.size());
assertEquals("John", list.get(0).getName());
assertEquals("Doe", list.get(0).getSurname());
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Queries can now be run over Hot Rod similar to Library mode.
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