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Chapter 6. The Infinispan Query DSL

The Infinispan Query DSL provides a simplified way of writing queries, and is agnostic of the underlying query mechanisms. This provides an alternative query engine to Lucene, while allowing use of the same query language or API.
JBoss Data Grid also includes indexless queries, which do not require a configured index and make everything easily searchable. However, indexless queries are only available with the new Query DSL for both the remote and embedded DSL-based queries (see Section 6.2, “Enabling Infinispan Query DSL-based Queries”). The Hibernate Search/Lucene-based API cannot use indexless queries.

Warning

The Infinispan Query DSL and Remote Querying described in this chapter are Technology Preview and not supported in JBoss Data Grid.
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6.1. Creating Queries with Infinispan Query DSL
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The new query API is located in the org.infinispan.query.dsl package. A query is created with the assistance of the QueryFactory instance, which is obtained using Search.getQueryFactory(). Each QueryFactory instance is bound to the one cache instance, and is a stateless and thread-safe object that can be used for creating multiple parallel queries.
The Infinispan Query DSL uses the following steps to perform a query.
  1. A query is created by invocating the from(Class entityType) method, which returns a QueryBuilder object that is responsible for creating queries for the specified entity class from the given cache.
  2. The QueryBuilder accumulates search criteria and configuration specified through invoking its DSL methods, and is used to build a Query object by invoking the QueryBuilder.build() method, which completes the construction. The QueryBuilder object cannot be used for constructing multiple queries at the same time except for nested queries, however it can be reused afterwards.
  3. Invoke the list() method of the Query object to execute the query and fetch the results. Once executed, the Query object is not reusable. If new results must be fetched, a new instance must be obtained by calling QueryBuilder.build().

Important

A query targets a single entity type and is evaluated over the contents of a single cache. Running a query over multiple caches, or creating queries targeting several entity types is not supported.
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