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// Portions Copyright [2019-2021] [Payara Foundation and/or its affiliates]
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 java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.logging.Logger;
import jakarta.ejb.EJBException;
import jakarta.ejb.EJBLocalHome;
/**
* Handler for EJBLocalHome invocations through EJBLocalHome proxy.
*
* @author Kenneth Saks
*/
public class EJBLocalHomeInvocationHandler extends EJBLocalHomeImpl implements InvocationHandler {
private static final Logger LOG = Logger.getLogger(EJBLocalHomeInvocationHandler.class.getName());
private final boolean isStatelessSession;
// Our associated proxy object. Used when a caller needs EJBLocalObject
// but only has InvocationHandler.
private EJBLocalHome proxy;
private final 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) {
this.isStatelessSession = ((EjbSessionDescriptor) ejbDescriptor).isStateless();
} else {
this.isStatelessSession = false;
}
this.localHomeIntfClass = localHomeIntf;
// NOTE : Container is not set on super-class until after
// constructor is called.
}
public void setMethodMap(MethodMap map) {
this.invocationInfoMap = map;
}
public void setProxy(EJBLocalHome proxy) {
this.proxy = proxy;
}
@Override
protected EJBLocalHome getEJBLocalHome() {
return proxy;
}
/**
* Called by EJBLocalHome proxy.
*/
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
LOG.finest(() -> String.format("invoke(proxy=%s, method=%s, args=%s)", proxy, method, Arrays.toString(args)));
ClassLoader originalClassLoader = null;
// NOTE : be careful with "args" parameter. It is null
// if method signature has 0 arguments.
try {
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());
}
final 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.
final InvocationInfo invInfo = (InvocationInfo) invocationInfoMap.get(method,
(args == null ? 0 : args.length));
if (invInfo == null) {
throw new IllegalStateException("Unknown method: " + method);
}
if ((methodClass == jakarta.ejb.EJBLocalHome.class) || invInfo.ejbIntfOverride) {
// There is exactly one argument on jakarta.ejb.EJBLocalHome: primaryKey
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.
final EJBLocalObjectImpl localImpl = createEJBLocalBusinessObjectImpl((String) args[0]);
return localImpl.getClientObject((String) args[0]);
}
// Process finder, create method, or home method.
EJBLocalObjectImpl localObjectImpl = null;
if (invInfo.startsWithCreate) {
localObjectImpl = createEJBLocalObjectImpl();
if (localObjectImpl != null) {
if (isStatelessSession) {
return localObjectImpl.getClientObject();
}
}
}
if (isStatelessSession) {
return null;
}
if (invInfo.targetMethod1 == null) {
final LocalStringManagerImpl msgs = new LocalStringManagerImpl(EJBLocalHomeInvocationHandler.class);
final Object[] params = new Object[] {invInfo.ejbName, "LocalHome", invInfo.method.toString()};
final String errorMsg = msgs.getLocalString("ejb.bean_class_method_not_found", "", params);
throw new EJBException(errorMsg);
}
final EjbInvocation inv = 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.invocationInfo = invInfo;
if (localObjectImpl != null && invInfo.startsWithCreate) {
inv.ejbObject = localObjectImpl;
}
final Object returnValue = invokeBean(args, invInfo, inv);
if (inv.exception != null) {
InvocationHandlerUtil.throwLocalException(inv.exception, method.getExceptionTypes());
}
return returnValue;
} finally {
if (originalClassLoader != null) {
Utility.setContextClassLoader(originalClassLoader);
}
getContainer().onLeavingContainer();
}
}
private Object invokeBean(Object[] args, final InvocationInfo invInfo, final EjbInvocation inv) {
try {
container.preInvoke(inv);
if (invInfo.startsWithCreate) {
final Object ejbCreateReturnValue = invokeTargetBeanMethod(container, invInfo.targetMethod1, inv,
inv.ejb, args);
postCreate(container, inv, invInfo, ejbCreateReturnValue, args);
if (inv.ejbObject == null) {
return null;
}
return ((EJBLocalObjectImpl) inv.ejbObject).getClientObject();
} else if (invInfo.startsWithFindByPrimaryKey) {
return container.invokeFindByPrimaryKey(invInfo.targetMethod1, inv, args);
} else if (invInfo.startsWithFind) {
final Object pKeys = invokeTargetBeanMethod(container, invInfo.targetMethod1, inv, inv.ejb, args);
return container.postFind(inv, pKeys, null);
} else {
return invokeTargetBeanMethod(container, invInfo.targetMethod1, inv, inv.ejb, args);
}
} catch (final InvocationTargetException ite) {
inv.exception = ite.getCause();
return null;
} catch (final Throwable c) {
inv.exception = c;
return null;
} finally {
container.postInvoke(inv);
}
}
// 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);
}
}
