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package com.sun.ejb.containers;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Logger;
import java.util.logging.Level;
import javax.ejb.EJBException;
import javax.ejb.EJBLocalObject;
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.util.LocalStringManagerImpl;
import com.sun.enterprise.util.Utility;
/**
* Handler for EJBLocalObject invocations through EJBLocalObject proxy.
*
*
* @author Kenneth Saks
*/
public final class EJBLocalObjectInvocationHandler
extends EJBLocalObjectImpl implements InvocationHandler {
private static final Logger logger = EjbContainerUtilImpl.getLogger();
private static LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(EJBLocalObjectInvocationHandler.class);
// Our associated proxy object. Used when a caller needs EJBLocalObject
// but only has InvocationHandler.
private Object proxy_;
// 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 LocalObject proxy
// is created.
private MethodMap invocationInfoMap_;
private Class localIntf_;
/**
* Constructor used for Local Home view
*/
public EJBLocalObjectInvocationHandler(MethodMap invocationInfoMap,
Class localIntf)
throws Exception {
invocationInfoMap_ = invocationInfoMap;
localIntf_ = localIntf;
setIsLocalHomeView(true);
// NOTE : Container is not set on super-class until after
// constructor is called.
}
/**
* Constructor used for Local Business view.
*/
public EJBLocalObjectInvocationHandler(MethodMap invocationInfoMap,
boolean optionalLocalBusinessView)
throws Exception {
invocationInfoMap_ = invocationInfoMap;
setIsLocalHomeView(false);
setIsOptionalLocalBusinessView(optionalLocalBusinessView);
// NOTE : Container is not set on super-class until after
// constructor is called.
}
public void setProxy(Object proxy) {
proxy_ = proxy;
}
public Object getClientObject() {
return proxy_;
}
/**
* This entry point is only used for Local Home view.
*/
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
return invoke(localIntf_, 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. 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();
}
// 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.EJBLocalObject.class) ||
invInfo.ejbIntfOverride ) {
return invokeEJBLocalObjectMethod(method.getName(), args);
} else if( invInfo.targetMethod1 == null ) {
Object [] params = new Object[]
{ invInfo.ejbName, "Local", invInfo.method.toString() };
logger.log(Level.SEVERE, "ejb.bean_class_method_not_found",
params);
String errorMsg = localStrings.getLocalString
("ejb.bean_class_method_not_found", "", params);
throw new EJBException(errorMsg);
}
// Process application-specific method.
Object returnValue = null;
EjbInvocation inv = container.createEjbInvocation();
inv.isLocal = true;
inv.isBusinessInterface = !isLocalHomeView();
inv.isHome = false;
inv.ejbObject = this;
inv.method = method;
inv.methodParams = args;
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;
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.throwLocalException
(inv.exception, method.getExceptionTypes());
}
return returnValue;
} finally {
if( originalClassLoader != null ) {
Utility.setContextClassLoader(originalClassLoader);
}
container.onLeavingContainer();
}
}
private Object invokeEJBLocalObjectMethod(String methodName, Object[] args)
throws Exception
{
// Return value is null if target method returns void.
Object returnValue = null;
int methodIndex = -1;
Exception caughtException = null;
// Can only be remove, isIdentical, getEJBLocalHome, or getPrimaryKey,
// so optimize by comparing as few characters as possible.
try {
switch(methodName.charAt(0)) {
case 'r' :
// void remove();
methodIndex = container.EJBLocalObject_remove;
container.onEjbMethodStart(methodIndex);
super.remove();
break;
case 'i' :
// boolean isIdentical(EJBLocalObject)
// Convert the param into an EJBLocalObjectImpl. Can't
// assume it's an EJBLocalObject for an ejb that was deployed
// using dynamic proxies.
EJBLocalObject other = (EJBLocalObject) args[0];
EJBLocalObjectImpl otherImpl =
EJBLocalObjectImpl.toEJBLocalObjectImpl(other);
methodIndex = container.EJBLocalObject_isIdentical;
container.onEjbMethodStart(methodIndex);
returnValue = super.isIdentical(otherImpl);
break;
case 'g' :
if( methodName.charAt(3) == 'E' ) {
// EJBLocalHome getEJBLocalHome();
methodIndex = container.EJBLocalObject_getEJBLocalHome;
container.onEjbMethodStart(methodIndex);
returnValue = super.getEJBLocalHome();
} else {
// Object getPrimaryKey();
methodIndex = container.EJBLocalObject_getPrimaryKey;
container.onEjbMethodStart(methodIndex);
returnValue = super.getPrimaryKey();
}
break;
default :
throw new EJBException("unknown method = " + methodName);
}
} catch (Exception ex) {
caughtException = ex;
throw ex;
} finally {
if (methodIndex != -1) {
container.onEjbMethodEnd(methodIndex,caughtException);
}
}
return returnValue;
}
}