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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 jakarta.ejb.EJBException;
import jakarta.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 == jakarta.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.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;
    }

}