1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* 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
*
* http://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.tuscany.sca.binding.ejb.util;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.rmi.RemoteException;
import java.rmi.UnexpectedException;
import javax.ejb.CreateException;
import javax.ejb.EJBLocalHome;
import javax.naming.NamingException;
import javax.rmi.CORBA.Util;
import org.omg.CORBA.SystemException;
import org.omg.CORBA.portable.ApplicationException;
import org.omg.CORBA.portable.ObjectImpl;
import org.omg.CORBA.portable.RemarshalException;
import org.omg.stub.java.rmi._Remote_Stub;
import org.oasisopen.sca.ServiceRuntimeException;
/**
* Factor class that is used to create EJB Proxies.
*
* @version $Rev$ $Date$
*/
final class EJBObjectFactory {
private EJBObjectFactory() {
}
/**
* Get either a generated of dynamic EJB stub using the specified JNDI
* properties.
* <p>
* The returned stub will implement the specified stubInterface Interface.
* If the underlying EJB stub is not assignable from the specified
* stubInterface then a proxy is used to convert between the two.
* <p>
* The returned EJB stub may be either the pregenerated EJB stub or a
* dynamic stub. This allows a client to invoke an EJB without requiring any
* of the pregenerated EJB stub classes be available in the classpath.
* <p>
*/
static Object createStub(NamingEndpoint namingEndpoint, InterfaceInfo ejbInterface) throws NamingException,
RemoteException, CreateException {
EJBLocator locator = namingEndpoint.getLocator();
Object homeObject = locator.locate(namingEndpoint.getJndiName());
/*
* The type of the object returned from the lookup is as follows: If the
* generated stub exists on the classpath, it's an instance of that
* type, otherwise, "org.omg.stub.java.rmi._Remote_Stub" or
* "org.omg.stub.javax.ejb._EJBHome_Stub"
*/
Object stub = getEJBStub(homeObject, ejbInterface);
// Cache dynamic stub only
return stub;
}
/**
* @param homeObject
* @param ejbHomeClass
* @return
* @throws RemoteException
*/
private static Object getEJBStub(Object homeObject, InterfaceInfo ejbInterface) throws RemoteException,
CreateException {
Object stub = null;
// Get the business interface of the EJB
Class ejbInterfaceClass = null;
try {
ejbInterfaceClass = Thread.currentThread().getContextClassLoader().loadClass(ejbInterface.getName());
} catch (ClassNotFoundException e) {
// ignore
}
if (ejbInterfaceClass != null && ejbInterfaceClass.isInstance(homeObject)) {
// EJB 3
stub = homeObject;
} else if (homeObject instanceof EJBLocalHome) {
// Local EJB
stub = createEJBLocalObject(homeObject);
} else {
// Handle dynamic stub
if (homeObject instanceof ObjectImpl) {
ObjectImpl objectImpl = (ObjectImpl)homeObject;
stub = createEJBObject(objectImpl);
}/**
* Above checks will be satisfied if Bean is running on servers like WebSphere. With this
* logic, client (SCA composite with EJB ref binding) doesn't need to include home class or
* client stubs.
*
* Below check is needed SCA composite with EJB ref binding is accessing openEJB implementation.
* For e.g if the bean is running on Geronimo.
*/
else if ((javax.rmi.PortableRemoteObject.narrow(homeObject, javax.ejb.EJBHome.class)) instanceof javax.ejb.EJBHome) {
stub = createEJBObjectFromHome(homeObject);
} else
throw new ServiceRuntimeException("Invalid stub type: " + homeObject.getClass());
}
return stub;
}
/**
* Create a pre-generated EJB stub
*
* @param homeObject
* @return
* @throws RemoteException
*/
static private Object createEJBLocalObject(Object homeObject) throws RemoteException {
Object stub = null;
try {
// Find the "create()" method
Method createMethod = homeObject.getClass().getMethod("create", null);
// Create an EJB object
stub = createMethod.invoke(homeObject, null);
} catch (NoSuchMethodException e) {
// "create()" method not found, it's still a dynamic stub
stub = null;
} catch (InvocationTargetException e) {
throw new RemoteException(e.getTargetException().toString());
} catch (Exception e) {
throw new RemoteException(e.toString());
}
return stub;
}
/**
* Here homeObject is instance of EJBHome
*
* @param homeObject
* @return
* @throws RemoteException
*/
private static Object createEJBObjectFromHome(Object homeObject) throws RemoteException {
Object stub = null;
try {
// Find the "create()" method
Method createMethod = homeObject.getClass().getMethod("create", null);
// Create an EJB object
stub = createMethod.invoke(homeObject, null);
} catch (NoSuchMethodException e) {
// "create()" method not found, it's still a dynamic stub
stub = null;
} catch (InvocationTargetException e) {
throw new RemoteException(e.getTargetException().toString());
} catch (Exception e) {
throw new RemoteException(e.toString());
}
return stub;
}
/**
* Create an EJBObject using RMI/IIOP APIs
*
* @param ejbHomeObject
* @return The EJBObject remote stub
* @throws CreateException
* @throws RemoteException
*/
private static Object createEJBObject(ObjectImpl ejbHomeObject) throws CreateException, RemoteException {
try {
org.omg.CORBA_2_3.portable.InputStream in = null;
try {
org.omg.CORBA.portable.OutputStream out = ejbHomeObject._request("create", true);
in = (org.omg.CORBA_2_3.portable.InputStream)ejbHomeObject._invoke(out);
// The Remote stub should be available in JDK
// TODO: [rfeng] Work around an issue in Apache Yoko which doesn't understand the org.omg.stub.*
return in.read_Object(_Remote_Stub.class);
} catch (ApplicationException ex) {
in = (org.omg.CORBA_2_3.portable.InputStream)ex.getInputStream();
String id = in.read_string();
if (id.equals("IDL:javax/ejb/CreateEx:1.0")) {
throw (CreateException)in.read_value(CreateException.class);
}
throw new UnexpectedException(id);
} catch (RemarshalException ex) {
return createEJBObject(ejbHomeObject);
} finally {
ejbHomeObject._releaseReply(in);
}
} catch (SystemException ex) {
throw Util.mapSystemException(ex);
}
}
}
|
