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6.3. 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.
6.3.1. Creating Queries with Infinspan 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 from the per-cache SearchManager. Each QueryFactory instance is bound to the same cache instance as the SearchManager, otherwise it 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.
- A query is created by invocating the
from(Class entityType)method, which returns aQueryBuilderobject that is responsible for creating queries for the specified entity class from the given cache. - The
QueryBuilderaccumulates search criteria and configuration specified through invoking its DSL methods, and is used to build aQueryobject by invoking theQueryBuilder.build()method, which completes the construction. TheQueryobject cannot be used for constructing multiple queries at the same time except for nested queries, however it can be reused afterwards. - Invoke the
list()method of theQueryobject to execute the query and fetch the results. Once executed, theQueryobject is not reusable. If new results must be fetched, a new instance must be obtained by callingQueryBuilder.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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