01: /*
02: * Copyright 2002-2005 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16:
17: package org.springframework.orm.hibernate3;
18:
19: import javax.sql.DataSource;
20:
21: import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;
22:
23: /**
24: * Subclass of LocalDataSourceConnectionProvider that returns a
25: * transaction-aware proxy for the exposed DataSource. Used if
26: * LocalSessionFactoryBean's "useTransactionAwareDataSource" flag is on.
27: *
28: * @author Juergen Hoeller
29: * @since 1.2
30: * @see LocalSessionFactoryBean#setUseTransactionAwareDataSource
31: */
32: public class TransactionAwareDataSourceConnectionProvider extends
33: LocalDataSourceConnectionProvider {
34:
35: /**
36: * Return a TransactionAwareDataSourceProxy for the given DataSource,
37: * provided that it isn't a TransactionAwareDataSourceProxy already.
38: */
39: protected DataSource getDataSourceToUse(
40: DataSource originalDataSource) {
41: if (originalDataSource instanceof TransactionAwareDataSourceProxy) {
42: return originalDataSource;
43: }
44: return new TransactionAwareDataSourceProxy(originalDataSource);
45: }
46:
47: /**
48: * This implementation returns <code>true</code>: We can guarantee
49: * to receive the same Connection within a transaction, as we are
50: * exposing a TransactionAwareDataSourceProxy.
51: */
52: public boolean supportsAggressiveRelease() {
53: return true;
54: }
55:
56: }
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