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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.Iterator;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.rmi.RemoteException;
import javax.ejb.EJBException;
import javax.ejb.EJBObject;
import com.sun.ejb.Invocation;
import com.sun.ejb.InvocationInfo;
import com.sun.ejb.Container;
import com.sun.ejb.containers.util.MethodMap;
import com.sun.enterprise.EJBObjectToTie;
import com.sun.enterprise.util.LocalStringManagerImpl;
import com.sun.enterprise.util.Utility;
import com.sun.logging.LogDomains;
/**
* Handler for EJBObject invocations through EJBObject proxy.
*
*
* @author Kenneth Saks
*/
public final class EJBObjectInvocationHandler
extends EJBObjectImpl implements InvocationHandler {
private static final Logger logger = LogDomains.getLogger(LogDomains.EJB_LOGGER);
private static LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(EJBObjectInvocationHandler.class);
// Cache reference to invocation info populated during container
// initialization. This avoids the overhead of building the method
// info each time a proxy is created.
private MethodMap invocationInfoMap_;
private Class remoteIntf_;
/**
* Constructor used for Remote Home view.
*/
public EJBObjectInvocationHandler(MethodMap invocationInfoMap,
Class remoteIntf)
throws Exception {
invocationInfoMap_ = invocationInfoMap;
remoteIntf_ = remoteIntf;
setIsRemoteHomeView(true);
// NOTE : Container is not set on super-class until after
// constructor is called.
}
/**
* Constructor used for Remote Business view.
*/
public EJBObjectInvocationHandler(MethodMap invocationInfoMap)
throws Exception {
invocationInfoMap_ = invocationInfoMap;
setIsRemoteHomeView(false);
// NOTE : Container is not set on super-class until after
// constructor is called.
}
/**
* This entry point is only used for the Remote Home view.
*/
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
return invoke(remoteIntf_, method, args);
}
Object invoke(Class clientInterface, 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 {
container.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);
}
// 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 Remote interface method :"
+ method);
}
if( (methodClass == javax.ejb.EJBObject.class) ||
invInfo.ejbIntfOverride ) {
return invokeEJBObjectMethod(method.getName(), args);
} else if( invInfo.targetMethod1 == null ) {
Object [] params = new Object[]
{ invInfo.ejbName, "Remote", invInfo.method.toString() };
String errorMsg = localStrings.getLocalString
("ejb.bean_class_method_not_found", "", params);
logger.log(Level.SEVERE, "ejb.bean_class_method_not_found",
params);
throw new RemoteException(errorMsg);
}
// Process application-specific method.
Object returnValue = null;
Invocation inv = new Invocation();
inv.isLocal = false;
inv.isHome = false;
inv.isBusinessInterface = !isRemoteHomeView();
inv.ejbObject = this;
inv.method = method;
inv.clientInterface = clientInterface;
// Set cached invocation params. This will save additional lookups
// in BaseContainer.
inv.transactionAttribute = invInfo.txAttr;
inv.securityPermissions = invInfo.securityPermissions;
inv.invocationInfo = invInfo;
inv.beanMethod = invInfo.targetMethod1;
inv.methodParams = args;
try {
container.preInvoke(inv);
returnValue = container.intercept(inv);
} catch(InvocationTargetException ite) {
inv.exception = ite.getCause();
inv.exceptionFromBeanMethod = inv.exception;
} catch(Throwable t) {
inv.exception = t;
} finally {
container.postInvoke(inv);
}
if (inv.exception != null) {
InvocationHandlerUtil.throwRemoteException
(inv.exception, method.getExceptionTypes());
}
return returnValue;
} finally {
if( originalClassLoader != null ) {
Utility.setContextClassLoader(originalClassLoader);
}
container.onLeavingContainer();
}
}
private Object invokeEJBObjectMethod(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.
if( methodName.equals("getEJBHome") ) {
returnValue = super.getEJBHome();
} else if( methodName.equals("getHandle") ) {
returnValue = super.getHandle();
} else if( methodName.equals("getPrimaryKey") ) {
returnValue = super.getPrimaryKey();
} else if( methodName.equals("isIdentical") ) {
// boolean isIdentical(EJBObject)
// Convert the param into an EJBObject.
EJBObject other = (EJBObject) args[0];
returnValue = new Boolean(super.isIdentical(other));
} else if( methodName.equals("remove") ) {
super.remove();
} else {
throw new RemoteException("unknown EJBObject method = "
+ methodName);
}
return returnValue;
}
}
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