113 lines
4.3 KiB
Java
113 lines
4.3 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Header:$
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*/
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package org.apache.beehive.controls.system.ejb;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import javax.ejb.EJBObject;
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import javax.ejb.EJBLocalObject;
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import org.apache.beehive.controls.api.ControlException;
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import org.apache.beehive.controls.api.bean.ControlImplementation;
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/**
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* The SessionEJBControlImpl class is the control implementation class for
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* Stateless/Stateful Session EJBs.
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* <p/>
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* Currently, this is a noop since no session-bean specific control APIs
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* are defined, but having a unique control interface/impl class still allows
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* JellyBeans to create two different control types.
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*/
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@ControlImplementation(assembler = EJBControlAssembler.class)
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public class SessionEJBControlImpl
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extends EJBControlImpl
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implements SessionEJBControl, java.io.Serializable {
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static final long serialVersionUID = 1L;
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/**
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* Override ejbControl.onCreate to perform additional processing
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*/
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public void onCreate() {
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super.onCreate();
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if (_beanType != EJBControlImpl.SESSION_BEAN)
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throw new ControlException("Attempting to use a session bean control with a bean that is not a session bean");
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}
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/**
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* Implements auto-create semantics for Session beans.
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*/
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protected Object resolveBeanInstance() {
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// First, try to resolve from a cached EJB handle (if any)
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Object fromHandle = resolveBeanInstanceFromHandle();
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if (fromHandle != null)
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return fromHandle;
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// Find null arg create() on the home interface, and use it to get an instance
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try {
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/* todo: for efficiency, this could be done once per home interface and cached */
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Method createMethod = _homeInterface.getMethod("create", new Class []{});
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Object beanInstance = createMethod.invoke(_homeInstance, (Object[])null);
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_autoCreated = true;
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return beanInstance;
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}
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catch (NoSuchMethodException e) {
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throw new ControlException("Cannot auto-create session bean instance because no null argument create() method exists. To use this bean, you will need to call create() directly with the appropriate parameters");
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}
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catch (InvocationTargetException e) {
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_lastException = e.getTargetException();
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throw new ControlException("Unable to create session bean instance", _lastException);
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}
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catch (Exception e) {
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throw new ControlException("Unable to invoke home interface create method", e);
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}
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}
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protected void releaseBeanInstance(boolean alreadyRemoved) {
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//
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// For session EJBs, releasing the instance implies the physical
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// removal of the bean instance. If the bean was auto-created by
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// the control, it has responsibility for deleting.
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//
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if (_beanInstance != null && _autoCreated && !alreadyRemoved) {
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try {
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if (EJBObject.class.isAssignableFrom(_beanInterface))
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((EJBObject) _beanInstance).remove();
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else
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((EJBLocalObject) _beanInstance).remove();
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}
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/* RemoteException or RemoveException */
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catch (Exception e) {
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_lastException = e;
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}
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}
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super.releaseBeanInstance(alreadyRemoved);
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}
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/**
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* Set to true if the EJB instance was autocreated as a result of a bean method
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* call (as opposed to direct invocation of the home create() method).
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*/
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private boolean _autoCreated = false;
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}
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