Chapter 7. Remote Querying
JBoss Data Grid uses its own query language based on an internal DSL. The Infinispan Query DSL provides a simplified way of writing queries, and is agnostic of the underlying query mechanisms. Querying via the Hot Rod client allows remote, language-neutral querying, and is implementable in all languages currently available for the Hot Rod client.
Google's Protocol Buffers is used as an encoding format for both storing and querying data. The Infinispan Query DSL can be used remotely via the Hot Rod client that is configured to use the Protobuf marshaller. Protocol Buffers are used to adopt a common format for storing cache entries and marshalling them.
7.1. Querying Comparison
Feature | Embedded Querying and Lucene Query | Embedded DSL | Remote Querying |
---|---|---|---|
Indexing |
Mandatory
|
Optional but highly recommended
|
Optional but highly recommended
|
Index contents
|
Selected fields
|
All fields
|
All fields
|
Data Storage Format |
Java objects
|
Java objects
|
Protocol buffers
|
Keyword Queries |
Yes
|
Yes
|
Yes
|
Range Queries |
Yes
|
Yes
|
Yes
|
Fuzzy Queries |
Yes
|
No
|
No
|
Wildcard |
Yes
|
Limited to like queries (Matches a wildcard pattern that follows JPA rules).
|
Limited to like queries (Matches a wildcard pattern that follows JPA rules).
|
Phrase Queries |
Yes
|
No
|
No
|
Combining Queries |
AND, OR, NOT, SHOULD
|
AND, OR, NOT
|
AND, OR, NOT
|
Sorting Results |
Yes
|
Yes
|
Yes
|
Filtering Results |
Yes, both within the query and as appended operator
|
Within the query
|
Within the query
|
Pagination of Results |
Yes
|
Yes
|
Yes
|