| /***************************************************************** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| ****************************************************************/ |
| |
| package org.apache.cayenne.access; |
| |
| import java.util.Collection; |
| |
| import org.apache.cayenne.map.EntityResolver; |
| import org.apache.cayenne.query.Query; |
| |
| /** |
| * Defines methods used to run Cayenne queries. |
| */ |
| public interface QueryEngine { |
| |
| /** |
| * Executes a list of queries wrapping them in its own transaction. Results of |
| * execution are passed to {@link OperationObserver}object via its callback methods. |
| * |
| * @since 1.1 The signature has changed from List to Collection. |
| */ |
| void performQueries( |
| Collection<? extends Query> queries, |
| OperationObserver resultConsumer); |
| |
| /** |
| * Returns a resolver for this query engine that is capable of resolving between |
| * classes, entity names, and obj/db entities |
| */ |
| EntityResolver getEntityResolver(); |
| } |