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package com.sun.ejb.containers;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.lang.reflect.Method;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.rmi.RemoteException;
import javax.rmi.CORBA.Tie;
import javax.ejb.EJBException;
import javax.ejb.EJBHome;
import com.sun.ejb.EjbInvocation;
import com.sun.ejb.InvocationInfo;
import com.sun.ejb.Container;
import com.sun.ejb.containers.util.MethodMap;
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 java.util.concurrent.TimeUnit;
import com.sun.logging.LogDomains;
/**
* Handler for EJBHome invocations through EJBHome proxy.
*
* @author Kenneth Saks
*/
public class EJBHomeInvocationHandler
extends EJBHomeImpl implements InvocationHandler {
private static LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(EJBHomeInvocationHandler.class);
private boolean isStatelessSession_;
// Our associated proxy object. Used when a caller needs EJBHome
// but only has InvocationHandler.
private EJBHome proxy_;
private Class homeIntfClass_;
// 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 Home proxy
// is created.
private MethodMap invocationInfoMap_;
private EjbContainerUtil ejbContainerUtil = EjbContainerUtilImpl.getInstance();
protected EJBHomeInvocationHandler(EjbDescriptor ejbDescriptor,
Class homeIntfClass)
throws Exception {
if( ejbDescriptor instanceof EjbSessionDescriptor ) {
isStatelessSession_ =
((EjbSessionDescriptor)ejbDescriptor).isStateless();
} else {
isStatelessSession_ = false;
}
homeIntfClass_ = homeIntfClass;
// NOTE : Container is not set on super-class until after
// constructor is called.
}
public void setProxy(EJBHome proxy) {
proxy_ = proxy;
}
public void setMethodMap(MethodMap map) {
invocationInfoMap_ = map;
}
protected EJBHome getEJBHome() {
return proxy_;
}
/**
* Called by EJBHome 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. if the Home/Remote interfaces appear in
// a parent of the application's classloader),
// ServantLocator.preinvoke() will not be called by the
// ORB, and therefore BaseContainer.externalPreInvoke will not have
// been called for this invocation. 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 (invokeSpecialEJBHomeMethod(method, methodClass, args)) {
return null;
}
// 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 RemoteException("Unknown Home interface method :"
+ method);
} else if( (methodClass == javax.ejb.EJBHome.class) ||
invInfo.ejbIntfOverride ) {
return invokeEJBHomeMethod(method.getName(), args);
} else if( GenericEJBHome.class.isAssignableFrom(methodClass) ) {
if( method.getName().equals("create")) {
// This is an internal creation request through the EJB 3.0
// client view, so just create an business object and return it
EJBObjectImpl busObjectImpl = createRemoteBusinessObjectImpl();
return busObjectImpl.getStub((String) args[0]);
} else {
EjbAsyncInvocationManager asyncManager =
((EjbContainerUtilImpl) ejbContainerUtil).
getEjbAsyncInvocationManager();
Long asyncTaskID = (Long) args[0];
RemoteAsyncResult asyncResult = null;
if( method.getName().equals("cancel")) {
asyncResult = asyncManager.remoteCancel(asyncTaskID);
} else if( method.getName().equals("get") ) {
asyncResult = asyncManager.remoteGet(asyncTaskID);
} else if( method.getName().equals("isDone")) {
asyncResult = asyncManager.remoteIsDone(asyncTaskID);
} else if( method.getName().equals("getWithTimeout")) {
Long timeout = (Long) args[1];
TimeUnit unit = TimeUnit.valueOf((String)args[2]);
asyncResult = asyncManager.remoteGetWithTimeout(asyncTaskID, timeout, unit);
}
return asyncResult;
}
}
// Process finder, create method, or home method.
EJBObjectImpl ejbObjectImpl = null;
Object returnValue = null;
if( invInfo.startsWithCreate ) {
ejbObjectImpl = createEJBObjectImpl();
if (ejbObjectImpl != null) {
// Entity beans are created differently
returnValue = ejbObjectImpl.getStub();
}
}
if( !isStatelessSession_ ) {
if( invInfo.targetMethod1 == null ) {
_logger.log(Level.SEVERE,
"ejb.bean_class_method_not_found", new Object[] {
invInfo.ejbName, "Home",
invInfo.method.toString() });
//in exception use message without ID
String errorMsg = localStrings.getLocalString
("ejb.bean_class_method_not_found", "", new Object[]
{ invInfo.ejbName, "Home",
invInfo.method.toString() });
throw new RemoteException(errorMsg);
}
EjbInvocation inv = ((BaseContainer) getContainer()).createEjbInvocation();
inv.isRemote = true;
inv.method = method;
inv.isHome = true;
inv.clientInterface = homeIntfClass_;
// Set cached invocation params. This will save
// additional lookups in BaseContainer.
inv.transactionAttribute = invInfo.txAttr;
inv.invocationInfo = invInfo;
if( ejbObjectImpl != null && invInfo.startsWithCreate ) {
inv.ejbObject = (EJBLocalRemoteObject) ejbObjectImpl;
}
BaseContainer container = (BaseContainer) getContainer();
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 = ((EJBObjectImpl)inv.ejbObject).
getStub();
}
} 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.throwRemoteException
(inv.exception, method.getExceptionTypes());
}
}
return returnValue;
} finally {
if( originalClassLoader != null ) {
Utility.setContextClassLoader(originalClassLoader);
}
((BaseContainer) getContainer()).onLeavingContainer();
}
}
// default impl to be overridden in subclass if necessary
protected boolean invokeSpecialEJBHomeMethod(Method method, Class methodClass,
Object[] args) throws Exception {
return false;
}
// 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);
}
private Object invokeEJBHomeMethod(String methodName, Object[] args)
throws Exception
{
// Return value is null if target method returns void.
Object returnValue = null;
// NOTE : Might be worth optimizing this method check if it
// turns out to be a bottleneck. I don't think these methods
// are called with the frequency that this would be an issue,
// but it's worth considering.
int methodIndex = -1;
Exception caughtException = null;
BaseContainer container = (BaseContainer) getContainer();
try {
if( methodName.equals("getEJBMetaData") ) {
methodIndex = container.EJBHome_getEJBMetaData;
container.onEjbMethodStart(methodIndex);
returnValue = super.getEJBMetaData();
} else if( methodName.equals("getHomeHandle") ) {
methodIndex = container.EJBHome_getHomeHandle;
container.onEjbMethodStart(methodIndex);
returnValue = super.getHomeHandle();
} else if( methodName.equals("remove") ) {
if( args[0] instanceof javax.ejb.Handle ) {
methodIndex = container.EJBHome_remove_Handle;
container.onEjbMethodStart(methodIndex);
super.remove((javax.ejb.Handle)args[0]);
} else {
methodIndex = container.EJBHome_remove_Pkey;
container.onEjbMethodStart(methodIndex);
super.remove(args[0]);
}
} else {
throw new RemoteException("unknown EJBHome method = " + methodName);
}
} catch (Exception ex) {
caughtException = ex;
throw ex;
} finally {
if (methodIndex != -1) {
container.onEjbMethodEnd(methodIndex, caughtException);
}
}
return returnValue;
}
}