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Java > Open Source Codes > org > apache > cayenne > access > QueryEngine


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19
20 package org.apache.cayenne.access;
21
22 import java.util.Collection JavaDoc;
23
24 import org.apache.cayenne.map.EntityResolver;
25
26 /**
27  * Defines methods used to run Cayenne queries.
28  *
29  * @author Andrus Adamchik
30  */
31 public interface QueryEngine {
32
33     /**
34      * Executes a list of queries wrapping them in its own transaction. Results of
35      * execution are passed to {@link OperationObserver}object via its callback methods.
36      *
37      * @since 1.1 The signiture has changed from List to Collection.
38      */
39     public void performQueries(Collection JavaDoc queries, OperationObserver resultConsumer);
40
41     /**
42      * Returns a resolver for this query engine that is capable of resolving between
43      * classes, entity names, and obj/db entities
44      */
45     public EntityResolver getEntityResolver();
46 }
47
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