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package com.sun.enterprise.util;
import java.util.*;
import java.lang.reflect.*;
import com.sun.enterprise.deployment.*;
/**
* Utility class to calculate the list of methods required to have transaction
* attributes
*
* @author Jerome Dochez
* @version
*/
public class BeanMethodCalculator {
public static Vector getPossibleCmpCmrFields(ClassLoader cl,
String className)
throws Exception {
Vector fieldDescriptors = new Vector();
Class theClass = cl.loadClass(className);
// Start with all *public* methods
Method[] methods = theClass.getMethods();
// Find all accessors that could be cmp fields. This list
// will contain all cmr field accessors as well, since there
// is no good way to distinguish between the two purely based
// on method signature.
for(int mIndex = 0; mIndex < methods.length; mIndex++) {
Method next = methods[mIndex];
String nextName = next.getName();
int nextModifiers = next.getModifiers();
if( Modifier.isAbstract(nextModifiers) ) {
if( nextName.startsWith("get") &&
nextName.length() > 3 ) {
String field =
nextName.substring(3,4).toLowerCase() +
nextName.substring(4);
fieldDescriptors.add(new FieldDescriptor(field));
}
}
}
return fieldDescriptors;
}
public static Vector getMethodsFor(EjbDescriptor ejbDescriptor, ClassLoader classLoader)
throws ClassNotFoundException
{
Vector methods = new Vector();
if (ejbDescriptor.isRemoteInterfacesSupported()) {
addAllInterfaceMethodsIn(methods, classLoader.loadClass(ejbDescriptor.getHomeClassName()));
addAllInterfaceMethodsIn(methods, classLoader.loadClass(ejbDescriptor.getRemoteClassName()));
}
if (ejbDescriptor.isRemoteBusinessInterfacesSupported()) {
for(String intf : ejbDescriptor.getRemoteBusinessClassNames()) {
addAllInterfaceMethodsIn(methods, classLoader.loadClass(intf));
}
}
if (ejbDescriptor.isLocalInterfacesSupported()) {
addAllInterfaceMethodsIn(methods, classLoader.loadClass(ejbDescriptor.getLocalHomeClassName()));
addAllInterfaceMethodsIn(methods, classLoader.loadClass(ejbDescriptor.getLocalClassName()));
}
if (ejbDescriptor.isLocalBusinessInterfacesSupported()) {
for(String intf : ejbDescriptor.getLocalBusinessClassNames()) {
addAllInterfaceMethodsIn(methods, classLoader.loadClass(intf));
}
}
if (ejbDescriptor.hasWebServiceEndpointInterface()) {
addAllInterfaceMethodsIn(methods, classLoader.loadClass(ejbDescriptor.getWebServiceEndpointInterfaceName()));
}
return methods;
}
private static void addAllInterfaceMethodsIn(Collection methods, Class c) {
methods.addAll(Arrays.asList(c.getMethods()));
}
/**
* @return a collection of MethodDescriptor for all the methods of my
* ejb which are elligible to have a particular transaction setting.
*/
public static Collection getTransactionalMethodsFor(EjbDescriptor ejbDescriptor, ClassLoader loader)
throws ClassNotFoundException, NoSuchMethodException
{
// only set if desc is a stateful session bean. NOTE that
// !statefulSessionBean does not imply stateless session bean
boolean statefulSessionBean = false;
Vector methods = new Vector();
if (ejbDescriptor instanceof EjbSessionDescriptor) {
statefulSessionBean =
((EjbSessionDescriptor) ejbDescriptor).isStateful();
// Session Beans
if (ejbDescriptor.isRemoteInterfacesSupported()) {
Collection disallowedMethods = extractDisallowedMethodsFor(javax.ejb.EJBObject.class, sessionBeanMethodsDisallowed);
Collection potentials = getTransactionMethodsFor(loader, ejbDescriptor.getRemoteClassName() , disallowedMethods);
transformAndAdd(potentials, MethodDescriptor.EJB_REMOTE, methods);
}
if( ejbDescriptor.isRemoteBusinessInterfacesSupported() ) {
for(String intfName :
ejbDescriptor.getRemoteBusinessClassNames() ) {
Class businessIntf = loader.loadClass(intfName);
Method[] busIntfMethods = businessIntf.getMethods();
for (Method next : busIntfMethods ) {
methods.add(new MethodDescriptor
(next, MethodDescriptor.EJB_REMOTE));
}
}
}
if (ejbDescriptor.isLocalInterfacesSupported()) {
Collection disallowedMethods = extractDisallowedMethodsFor(javax.ejb.EJBLocalObject.class, sessionLocalBeanMethodsDisallowed);
Collection potentials = getTransactionMethodsFor(loader, ejbDescriptor.getLocalClassName() , disallowedMethods);
transformAndAdd(potentials, MethodDescriptor.EJB_LOCAL, methods);
}
if( ejbDescriptor.isLocalBusinessInterfacesSupported() ) {
for(String intfName :
ejbDescriptor.getLocalBusinessClassNames() ) {
Class businessIntf = loader.loadClass(intfName);
Method[] busIntfMethods = businessIntf.getMethods();
for (Method next : busIntfMethods ) {
methods.add(new MethodDescriptor
(next, MethodDescriptor.EJB_LOCAL));
}
}
}
if (ejbDescriptor.hasWebServiceEndpointInterface()) {
Class webServiceClass = loader.loadClass
(ejbDescriptor.getWebServiceEndpointInterfaceName());
Method[] webMethods = webServiceClass.getMethods();
for (int i=0;i<webMethods.length;i++) {
methods.add(new MethodDescriptor(webMethods[i],
MethodDescriptor.EJB_WEB_SERVICE));
}
}
} else {
// entity beans local interfaces
String homeIntf = ejbDescriptor.getHomeClassName();
if (homeIntf!=null) {
Class home = loader.loadClass(homeIntf);
Collection potentials = getTransactionMethodsFor(javax.ejb.EJBHome.class, home);
transformAndAdd(potentials, MethodDescriptor.EJB_HOME, methods);
String remoteIntf = ejbDescriptor.getRemoteClassName();
Class remote = loader.loadClass(remoteIntf);
potentials = getTransactionMethodsFor(javax.ejb.EJBObject.class, remote);
transformAndAdd(potentials, MethodDescriptor.EJB_REMOTE, methods);
}
// enity beans remote interfaces
String localHomeIntf = ejbDescriptor.getLocalHomeClassName();
if (localHomeIntf!=null) {
Class home = loader.loadClass(localHomeIntf);
Collection potentials = getTransactionMethodsFor(javax.ejb.EJBLocalHome.class, home);
transformAndAdd(potentials, MethodDescriptor.EJB_LOCALHOME, methods);
String remoteIntf = ejbDescriptor.getLocalClassName();
Class remote = loader.loadClass(remoteIntf);
potentials = getTransactionMethodsFor(javax.ejb.EJBLocalObject.class, remote);
transformAndAdd(potentials, MethodDescriptor.EJB_LOCAL, methods);
}
}
if( !statefulSessionBean ) {
Class ejbClass = loader.loadClass(ejbDescriptor.getEjbClassName());
if( ejbDescriptor.isTimedObject() ) {
methods.add(ejbDescriptor.getEjbTimeoutMethod());
}
}
return methods;
}
private static Collection getTransactionMethodsFor(ClassLoader loader, String interfaceName, Collection disallowedMethods)
throws ClassNotFoundException
{
Class clazz = loader.loadClass(interfaceName);
return getTransactionMethodsFor(clazz, disallowedMethods);
}
private static Collection getTransactionMethodsFor(Class interfaceImpl, Collection disallowedMethods) {
Vector v = new Vector(Arrays.asList(interfaceImpl.getMethods()));
v.removeAll(disallowedMethods);
return v;
}
private static Collection getTransactionMethodsFor(Class interfaceType, Class interfaceImpl) {
Collection disallowedTransactionMethods = getDisallowedTransactionMethodsFor(interfaceType);
return getTransactionMethodsFor(interfaceImpl, disallowedTransactionMethods);
}
private static Collection getDisallowedTransactionMethodsFor(Class interfaceType) {
return extractDisallowedMethodsFor(interfaceType, getDisallowedMethodsNamesFor(interfaceType));
}
// from EJB 2.0 spec section 17.4.1
private static Collection extractDisallowedMethodsFor(Class interfaceType, String[] methodNames) {
Vector v = new Vector();
// no disallowed methods for this interface
if (methodNames.length==0)
return v;
Method methods[] = interfaceType.getMethods();
for (int i=0; i<methods.length; i++) {
// all methods of the interface are disallowed
if (methodNames[0].equals("*"))
v.addElement(methods[i]);
else if (Arrays.binarySearch(methodNames, methods[i].getName())>=0)
v.addElement(methods[i]);
}
return v;
}
/**
* utiliy method to transform our collection of Method objects into
* MethodDescriptor objects and add them to our global list of
* elligible methods
* @param the collection of acceptable method objects
* @param the method-intf identifier for those methods
* @param the global list of MethodDescriptors objects
*/
private static void transformAndAdd(Collection methods, String methodIntf, Vector globalList) {
for (Iterator itr = methods.iterator();itr.hasNext();) {
Method m = (Method) itr.next();
MethodDescriptor md = new MethodDescriptor(m, methodIntf);
globalList.add(md);
}
}
/**
* @return the list of disallowed methods for a particular interface
*/
private static String[] getDisallowedMethodsNamesFor(Class interfaceType) {
return (String[]) getDisallowedMethodsNames().get(interfaceType);
}
/**
* @return a Map of disallowed methods per interface type. The key to the
* map is the interface type (e.g. EJBHome, EJBObject), the value
* is an array of methods names disallowed to have transaction attributes
*/
protected static Map getDisallowedMethodsNames() {
if (disallowedMethodsPerInterface==null) {
disallowedMethodsPerInterface = new Hashtable();
disallowedMethodsPerInterface.put(javax.ejb.EJBHome.class, entityBeanHomeMethodsDisallowed);
disallowedMethodsPerInterface.put(javax.ejb.EJBObject.class, entityBeanRemoteMethodsDisallowed);
disallowedMethodsPerInterface.put(javax.ejb.EJBLocalHome.class, entityBeanLocalHomeMethodsDisallowed);
disallowedMethodsPerInterface.put(javax.ejb.EJBLocalObject.class, entityBeanLocalInterfaceMethodsDisallowed);
}
return disallowedMethodsPerInterface;
}
private final static String entityBeanHomeMethodsDisallowed[] = {
"getEJBMetaData", "getHomeHandle"
};
private final static String entityBeanRemoteMethodsDisallowed[] = {
"getEJBHome", "getHandle", "getPrimaryKey", "isIdentical"
};
private final static String entityBeanLocalHomeMethodsDisallowed[] = {};
private final static String entityBeanLocalInterfaceMethodsDisallowed[] = {
"getEJBLocalHome", "getPrimaryKey", "isIdentical"
};
private final static String sessionBeanMethodsDisallowed[] = {
"*"
};
private final static String sessionLocalBeanMethodsDisallowed[] = {
"*"
};
private static Map disallowedMethodsPerInterface;
}
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