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Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/EJBObjectFactory.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/EJBObjectFactory.java | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/EJBObjectFactory.java b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/EJBObjectFactory.java new file mode 100644 index 0000000000..119282adb9 --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/EJBObjectFactory.java @@ -0,0 +1,209 @@ +/* + * 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); + } + } +} |