01: /**
02: * EasyBeans
03: * Copyright (C) 2006 Bull S.A.S.
04: * Contact: easybeans@ow2.org
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2.1 of the License, or any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19: * USA
20: *
21: * --------------------------------------------------------------------------
22: * $Id: NoTxMethodCallOnlyEntityManagerInterceptor.java 1970 2007-10-16 11:49:25Z benoitf $
23: * --------------------------------------------------------------------------
24: */package org.ow2.easybeans.persistence.interceptors;
25:
26: import org.ow2.easybeans.api.EasyBeansInterceptor;
27: import org.ow2.easybeans.api.EasyBeansInvocationContext;
28:
29: /**
30: * This interceptor is used for the Transaction-scoped persistence context when
31: * there is no transaction. In this case the persistence context is used only
32: * for the method call. Interceptor adds in the thread local a new EntityManager
33: * that is closed at the end of the method.
34: * @author Florent Benoit
35: */
36: public class NoTxMethodCallOnlyEntityManagerInterceptor implements
37: EasyBeansInterceptor {
38:
39: /**
40: * Creates a new EntityManager before the method and close it at the end.
41: * @param invocationContext context with useful attributes on the current
42: * invocation
43: * @return result of the next invocation (to chain interceptors)
44: * @throws Exception if interceptor fails
45: */
46: public Object intercept(
47: final EasyBeansInvocationContext invocationContext)
48: throws Exception {
49: boolean persistentManagerPresent = (invocationContext
50: .getFactory().getContainer()
51: .getPersistenceUnitManager() != null);
52: if (persistentManagerPresent) {
53: try {
54: invocationContext.getFactory().getContainer()
55: .getPersistenceUnitManager().addCurrent();
56: return invocationContext.proceed();
57: } finally {
58: invocationContext.getFactory().getContainer()
59: .getPersistenceUnitManager()
60: .closeCurrentAndReturnToPrevious();
61: }
62: }
63: // No persistent manager, do nothing.
64: return invocationContext.proceed();
65: }
66:
67: }
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