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package com.sun.ejb.containers;
import com.sun.ejb.Container;
import com.sun.ejb.EjbInvocation;
import com.sun.ejb.InvocationInfo;
import com.sun.ejb.containers.util.MethodMap;
import com.sun.enterprise.container.common.spi.util.IndirectlySerializable;
import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.EjbSessionDescriptor;
import com.sun.enterprise.util.LocalStringManagerImpl;
import com.sun.enterprise.util.Utility;
import javax.ejb.EJBException;
import javax.ejb.EJBLocalHome;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Logger;
/**
* Handler for EJBLocalHome invocations through EJBLocalHome proxy.
*
* @author Kenneth Saks
*/
public class EJBLocalHomeInvocationHandler
extends EJBLocalHomeImpl implements InvocationHandler {
private static final Logger logger = EjbContainerUtilImpl.getLogger();
private static LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(EJBLocalHomeInvocationHandler.class);
private boolean isStatelessSession_;
// Our associated proxy object. Used when a caller needs EJBLocalObject
// but only has InvocationHandler.
private EJBLocalHome proxy_;
private Class localHomeIntfClass_;
// Cache reference to invocation info. There is one of these per
// container. It's populated during container initialization and
// passed in when the InvocationHandler is created. This avoids the
// overhead of building the method info each time a LocalHome proxy
// is created.
private MethodMap invocationInfoMap_;
protected EJBLocalHomeInvocationHandler(EjbDescriptor ejbDescriptor,
Class localHomeIntf)
throws Exception {
if( ejbDescriptor instanceof EjbSessionDescriptor ) {
isStatelessSession_ =
((EjbSessionDescriptor)ejbDescriptor).isStateless();
} else {
isStatelessSession_ = false;
}
localHomeIntfClass_ = localHomeIntf;
// NOTE : Container is not set on super-class until after
// constructor is called.
}
public void setMethodMap(MethodMap map) {
invocationInfoMap_ = map;
}
public void setProxy(EJBLocalHome proxy) {
proxy_ = proxy;
}
protected EJBLocalHome getEJBLocalHome() {
return proxy_;
}
/**
* Called by EJBLocalHome proxy.
*/
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
ClassLoader originalClassLoader = null;
// NOTE : be careful with "args" parameter. It is null
// if method signature has 0 arguments.
try {
((BaseContainer) getContainer()).onEnteringContainer();
// In some cases(e.g. CDI + OSGi combination) ClassLoader
// is accessed from the current Thread. In those cases we need to set
// the context classloader to the application's classloader before
// proceeding. Otherwise, the context classloader could still
// reflect the caller's class loader.
if( Thread.currentThread().getContextClassLoader() !=
getContainer().getClassLoader() ) {
originalClassLoader = Utility.setContextClassLoader
(getContainer().getClassLoader());
}
Class methodClass = method.getDeclaringClass();
if( methodClass == java.lang.Object.class ) {
return InvocationHandlerUtil.invokeJavaObjectMethod
(this, method, args);
} else if( methodClass == IndirectlySerializable.class ) {
return this.getSerializableObjectFactory();
} else if( handleSpecialEJBLocalHomeMethod(method, methodClass) ) {
return invokeSpecialEJBLocalHomeMethod(method, methodClass, args);
}
// Use optimized version of get that takes param count as an argument.
InvocationInfo invInfo = (InvocationInfo)
invocationInfoMap_.get(method, ((args != null) ? args.length : 0) );
if( invInfo == null ) {
throw new IllegalStateException("Unknown method :" + method);
}
if( (methodClass == javax.ejb.EJBLocalHome.class) ||
invInfo.ejbIntfOverride ) {
// There is only one method on javax.ejb.EJBLocalHome
super.remove(args[0]);
return null;
} else if(methodClass == GenericEJBLocalHome.class) {
// This is a creation request through the EJB 3.0
// client view, so just create a local business object and
// return it.
EJBLocalObjectImpl localImpl =
createEJBLocalBusinessObjectImpl((String) args[0]);
return localImpl.getClientObject((String) args[0]);
}
// Process finder, create method, or home method.
EJBLocalObjectImpl localObjectImpl = null;
Object returnValue = null;
if( invInfo.startsWithCreate ) {
localObjectImpl = createEJBLocalObjectImpl();
if (localObjectImpl != null) {
returnValue = localObjectImpl.getClientObject();
}
}
if( !isStatelessSession_ ) {
if( invInfo.targetMethod1 == null ) {
Object [] params = new Object[]
{ invInfo.ejbName, "LocalHome",
invInfo.method.toString() };
String errorMsg = localStrings.getLocalString
("ejb.bean_class_method_not_found", "", params);
throw new EJBException(errorMsg);
}
EjbInvocation inv = ((BaseContainer) getContainer()).createEjbInvocation();
inv.isLocal = true;
inv.isHome = true;
inv.method = method;
inv.clientInterface = localHomeIntfClass_;
// Set cached invocation params. This will save additional lookups
// in BaseContainer.
inv.transactionAttribute = invInfo.txAttr;
inv.securityPermissions = invInfo.securityPermissions;
inv.invocationInfo = invInfo;
if( localObjectImpl != null && invInfo.startsWithCreate ) {
inv.ejbObject = (EJBLocalRemoteObject) localObjectImpl;
}
try {
container.preInvoke(inv);
if( invInfo.startsWithCreate ) {
Object ejbCreateReturnValue = invokeTargetBeanMethod(container,
invInfo.targetMethod1, inv, inv.ejb, args);
postCreate(container, inv, invInfo, ejbCreateReturnValue, args);
if( inv.ejbObject != null ) {
returnValue = ((EJBLocalObjectImpl)inv.ejbObject)
.getClientObject();
}
} else if (invInfo.startsWithFindByPrimaryKey) {
returnValue = container.invokeFindByPrimaryKey(
invInfo.targetMethod1, inv, args);
} else if ( invInfo.startsWithFind ) {
Object pKeys = invokeTargetBeanMethod(container, invInfo.targetMethod1,
inv, inv.ejb, args);
returnValue = container.postFind(inv, pKeys, null);
} else {
returnValue = invokeTargetBeanMethod(container, invInfo.targetMethod1,
inv, inv.ejb, args);
}
} catch(InvocationTargetException ite) {
inv.exception = ite.getCause();
} catch(Throwable c) {
inv.exception = c;
} finally {
container.postInvoke(inv);
}
if (inv.exception != null) {
InvocationHandlerUtil.throwLocalException
(inv.exception, method.getExceptionTypes());
}
}
return returnValue;
} finally {
if( originalClassLoader != null ) {
Utility.setContextClassLoader(originalClassLoader);
}
((BaseContainer) getContainer()).onLeavingContainer();
}
}
// default impl to be overridden in subclasses if special invoke is necessary
protected boolean handleSpecialEJBLocalHomeMethod(Method method, Class methodClass) {
return false;
}
// default impl to be overridden in subclasses if special invoke is necessary
protected Object invokeSpecialEJBLocalHomeMethod(Method method, Class methodClass,
Object[] args) throws Throwable {
return null;
}
// default impl to be overridden in subclass if necessary
protected void postCreate(Container container, EjbInvocation inv,
InvocationInfo invInfo, Object primaryKey, Object[] args)
throws Throwable {
}
// allow subclasses to execute a protected method in BaseContainer
protected Object invokeTargetBeanMethod(BaseContainer container,
Method beanClassMethod, EjbInvocation inv, Object target, Object[] params)
throws Throwable {
return container.invokeTargetBeanMethod(beanClassMethod, inv, target, params, null);
}
}