org.apache.openejb.assembler.classic.InterceptorBindingBuilder Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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package org.apache.openejb.assembler.classic;
import org.apache.openejb.BeanContext;
import org.apache.openejb.OpenEJBException;
import org.apache.openejb.core.interceptor.InterceptorData;
import org.apache.openejb.util.LogCategory;
import org.apache.openejb.util.Logger;
import org.apache.openejb.util.SetAccessible;
import javax.interceptor.InvocationContext;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* @version $Rev$ $Date$
*/
public class InterceptorBindingBuilder {
public static final Logger logger = Logger.getInstance(LogCategory.OPENEJB_STARTUP, InterceptorBindingBuilder.class.getPackage().getName());
private final List packageAndClassBindings;
public enum Level {
PACKAGE, ANNOTATION_CLASS, CLASS, ANNOTATION_METHOD, OVERLOADED_METHOD, EXACT_METHOD
}
public enum Type {
ADDITION_OR_LOWER_EXCLUSION, SAME_LEVEL_EXCLUSION, SAME_AND_LOWER_EXCLUSION, EXPLICIT_ORDERING
}
private final ArrayList bindings;
private final Map interceptors = new HashMap();
public InterceptorBindingBuilder(final ClassLoader cl, final EjbJarInfo ejbJarInfo) throws OpenEJBException {
bindings = new ArrayList(ejbJarInfo.interceptorBindings);
Collections.sort(bindings, new IntercpetorBindingComparator());
Collections.reverse(bindings);
packageAndClassBindings = new ArrayList();
for (final InterceptorBindingInfo binding : bindings) {
final Level level = level(binding);
if (level == Level.PACKAGE || level == Level.CLASS || level == Level.ANNOTATION_CLASS) {
packageAndClassBindings.add(binding);
}
}
for (final InterceptorInfo info : ejbJarInfo.interceptors) {
Class clazz = null;
try {
clazz = Class.forName(info.clazz, true, cl);
} catch (final ClassNotFoundException e) {
throw new OpenEJBException("Interceptor class cannot be loaded: " + info.clazz);
}
final InterceptorData interceptor = new InterceptorData(clazz);
toMethods(clazz, info.aroundInvoke, interceptor.getAroundInvoke());
toMethods(clazz, info.postActivate, interceptor.getPostActivate());
toMethods(clazz, info.prePassivate, interceptor.getPrePassivate());
toMethods(clazz, info.postConstruct, interceptor.getPostConstruct());
toMethods(clazz, info.preDestroy, interceptor.getPreDestroy());
toMethods(clazz, info.afterBegin, interceptor.getAfterBegin());
toMethods(clazz, info.beforeCompletion, interceptor.getBeforeCompletion());
toMethods(clazz, info.afterCompletion, interceptor.getAfterCompletion());
toMethods(clazz, info.aroundTimeout, interceptor.getAroundTimeout());
interceptors.put(info.clazz, interceptor);
}
}
public void build(final BeanContext beanContext, final EnterpriseBeanInfo beanInfo) {
Class clazz = beanContext.getBeanClass();
final InterceptorData beanAsInterceptor = new InterceptorData(clazz);
if (beanInfo instanceof StatelessBeanInfo || beanInfo instanceof MessageDrivenBeanInfo) {
/*
* 4.3.10.2 and 4.5.8
* If the stateless session bean or MDB instance has an ejbCreate method,
* the container treats the ejbCreate method as the instance’s PostConstruct method,
* and, in this case, the PostConstruct annotation (or deployment descriptor metadata)
* can only be applied to the bean’s ejbCreate method.
*/
final NamedMethodInfo info = new NamedMethodInfo();
info.className = clazz.getName();
final Method createMethod = beanContext.getCreateMethod();
info.methodName = (createMethod != null) ? createMethod.getName(): "ejbCreate";
info.methodParams = new ArrayList();
try {
final Method ejbcreate = MethodInfoUtil.toMethod(clazz, info);
if (ejbcreate != null) {
final CallbackInfo ejbcreateAsPostConstruct = new CallbackInfo();
ejbcreateAsPostConstruct.className = ejbcreate.getDeclaringClass().getName();
ejbcreateAsPostConstruct.method = ejbcreate.getName();
beanInfo.postConstruct.add(ejbcreateAsPostConstruct);
}
} catch (final IllegalStateException e) {
// there's no ejbCreate method in stateless bean.
}
}
toMethods(clazz, beanInfo.aroundInvoke, beanAsInterceptor.getAroundInvoke());
toCallback(clazz, beanInfo.postConstruct, beanAsInterceptor.getPostConstruct());
toCallback(clazz, beanInfo.preDestroy, beanAsInterceptor.getPreDestroy());
if (beanInfo instanceof StatefulBeanInfo) {
final StatefulBeanInfo stateful = (StatefulBeanInfo) beanInfo;
toCallback(clazz, stateful.postActivate, beanAsInterceptor.getPostActivate());
toCallback(clazz, stateful.prePassivate, beanAsInterceptor.getPrePassivate());
toCallback(clazz, stateful.afterBegin, beanAsInterceptor.getAfterBegin());
toCallback(clazz, stateful.beforeCompletion, beanAsInterceptor.getBeforeCompletion());
toCallback(clazz, stateful.afterCompletion, beanAsInterceptor.getAfterCompletion(), boolean.class);
} else {
toMethods(clazz, beanInfo.aroundTimeout, beanAsInterceptor.getAroundTimeout());
}
while (clazz != null && clazz != Object.class) {
for (final Method method : clazz.getDeclaredMethods()) {
final List methodInterceptors = createInterceptorDatas(method, beanInfo.ejbName, this.bindings);
// The bean itself gets to intercept too and is always last.
methodInterceptors.add(beanAsInterceptor);
beanContext.setMethodInterceptors(method, methodInterceptors);
}
clazz = clazz.getSuperclass();
}
final List callbackInterceptorDatas = createInterceptorDatas(null, beanInfo.ejbName, this.packageAndClassBindings);
// The bean itself gets to intercept too and is always last.
callbackInterceptorDatas.add(beanAsInterceptor);
beanContext.setCallbackInterceptors(callbackInterceptorDatas);
}
private List createInterceptorDatas(final Method method, final String ejbName, final List bindings) {
final List methodBindings = processBindings(method, ejbName, bindings);
Collections.reverse(methodBindings);
final List methodInterceptors = new ArrayList();
for (final InterceptorBindingInfo info : methodBindings) {
final List classes = info.interceptorOrder.size() > 0 ? info.interceptorOrder : info.interceptors;
for (final String interceptorClassName : classes) {
final InterceptorData interceptorData = interceptors.get(interceptorClassName);
if (interceptorData == null) {
logger.warning("InterceptorBinding references non-existent (undeclared) interceptor: " + interceptorClassName);
continue;
}
methodInterceptors.add(interceptorData);
}
}
return methodInterceptors;
}
private List processBindings(final Method method, final String ejbName, final List bindings) {
final List methodBindings = new ArrayList();
// The only critical thing to understand in this loop is that
// the bindings have already been sorted high to low (first to last)
// in this order:
//
// Primary sort is "level":
// (highest/first)
// - Method-level bindings with params
// - Method-level with no params
// - Method-level bindings with params from annotations
// - Class-level
// - Class-level from annotation
// - Package-level (aka. default level)
// (lowest/last)
//
// They've been secondarily sorted *within* these levels by "type":
//
// (highest)
// - Explicit order
// - Exclude applying to current and lower levels
// - Exclude applying to just current level
// - Any addition for current level and/or exclusion for a lower level
// (lowest)
//
final Set excludes = new HashSet();
for (final InterceptorBindingInfo info : bindings) {
final Level level = level(info);
if (!implies(method, ejbName, level, info)) {
continue;
}
final Type type = type(level, info);
if (type == Type.EXPLICIT_ORDERING && !excludes.contains(level)) {
methodBindings.add(info);
// An explicit ordering trumps all other bindings of the same level or below
// (even other explicit order bindings). Any bindings that were higher than
// this one still apply (and will have already been applied).
//
// So we keep what we have, add this last binding and we're done with this method.
return methodBindings;
}
if (type == Type.SAME_AND_LOWER_EXCLUSION) {
// We're done as the only things that will come after this will be
// at the same or lower level and we've just been told to exclude them.
// Nothing more to do for this method.
return methodBindings;
}
if (type == Type.SAME_LEVEL_EXCLUSION) {
excludes.add(level);
}
if (!excludes.contains(level)) {
methodBindings.add(info);
}
if (info.excludeClassInterceptors) {
excludes.add(Level.CLASS);
excludes.add(Level.ANNOTATION_CLASS);
}
if (info.excludeDefaultInterceptors) {
excludes.add(Level.PACKAGE);
}
}
return methodBindings;
}
private boolean implies(final Method method, final String ejbName, final Level level, final InterceptorBindingInfo info) {
if (level == Level.PACKAGE) {
return true;
}
if (!ejbName.equals(info.ejbName)) {
return false;
}
if (level == Level.CLASS || level == Level.ANNOTATION_CLASS) {
return true;
}
final NamedMethodInfo methodInfo = info.method;
return MethodInfoUtil.matches(method, methodInfo);
}
/**
* Used for getting the java.lang.reflect.Method objects for the following callbacks:
*
* - @PostConstruct void (InvocationContext)
* - @PreDestroy void (InvocationContext)
* - @PrePassivate void (InvocationContext)
* - @PostActivate void (InvocationContext)
* - @AroundInvoke Object (InvocationContext) throws Exception
* - @AroundTimeout Object (InvocationContext) throws Exception
*
* @param clazz
* @param callbackInfos the raw CallbackInfo objects
* @param callbacks the collection where the created methods will be placed
*/
private void toMethods(final Class clazz, final List callbackInfos, final Set callbacks) {
final List methods = new ArrayList();
for (final CallbackInfo callbackInfo : callbackInfos) {
try {
Method method = getMethod(clazz, callbackInfo.method, InvocationContext.class);
if (callbackInfo.className == null && method.getDeclaringClass().equals(clazz) && !methods.contains(method)) {
methods.add(method);
}
if (method.getDeclaringClass().getName().equals(callbackInfo.className) && !methods.contains(method)) {
methods.add(method);
} else {
// check for a private method on the declared class
// find declared class
Class c = clazz;
while (c != null && !c.getName().equals(callbackInfo.className)) {
c = c.getSuperclass();
}
// get callback method
if (c != null) {
try {
method = getMethod(c, callbackInfo.method, InvocationContext.class);
// make sure it is private
if (Modifier.isPrivate(method.getModifiers()) && !methods.contains(method)) {
SetAccessible.on(method);
methods.add(method);
}
} catch (final NoSuchMethodException e) {
// no-op
}
}
}
} catch (final NoSuchMethodException e) {
logger.warning("Interceptor method not found (skipping): public Object " + callbackInfo.method + "(InvocationContext); in class " + clazz.getName());
}
}
Collections.sort(methods, new MethodCallbackComparator());
callbacks.addAll(methods);
}
/**
* Used for getting the java.lang.reflect.Method objects for the following callbacks:
*
* - @PostConstruct void ()
* - @PreDestroy void ()
* - @PrePassivate void ()
* - @PostActivate void ()
* - @AfterBegin void ()
* - @BeforeCompletion void ()
* - @AfterCompletion void (boolean)
*
* These apply to the bean class only, interceptor methods use InvocationContext as
* a parameter. The toMethods method is used for those.
*
* @param clazz
* @param callbackInfos
* @param callbacks
*/
private void toCallback(final Class clazz, final List callbackInfos, final Set callbacks, final Class... parameterTypes) {
final List methods = new ArrayList();
for (final CallbackInfo callbackInfo : callbackInfos) {
Class usedClazz = clazz;
if (clazz.isInterface() && !callbackInfo.className.equals(clazz.getName())) { // dynamic mbean for instance
try {
usedClazz = clazz.getClassLoader().loadClass(callbackInfo.className);
} catch (final ClassNotFoundException e) {
// ignored
}
}
try {
Method method = getMethod(usedClazz, callbackInfo.method, parameterTypes);
if (callbackInfo.className == null && !methods.contains(method)) {
methods.add(method);
} else if (method.getDeclaringClass().getName().equals(callbackInfo.className) && !methods.contains(method)) {
methods.add(method);
} else {
// check for a private method on the declared class
// find declared class
Class c = clazz;
while (c != null && !c.getName().equals(callbackInfo.className)) {
c = c.getSuperclass();
}
// get callback method
if (c != null) {
try {
method = c.getDeclaredMethod(callbackInfo.method);
// make sure it is private
if (Modifier.isPrivate(method.getModifiers()) && !methods.contains(method)) {
SetAccessible.on(method);
methods.add(method);
}
} catch (final NoSuchMethodException e) {
// no-op
}
}
}
} catch (final NoSuchMethodException e) {
final String message = "Bean Callback method not found (skipping): public void " + callbackInfo.method + "(); in class " + clazz.getName();
logger.warning(message);
throw new IllegalStateException(message, e);
}
}
Collections.sort(methods, new MethodCallbackComparator());
callbacks.addAll(methods);
}
/**
* Used by toMethods and toCallbacks to find the nearest java.lang.reflect.Method with the given
* name and parameters. Callbacks can be private so class.getMethod() cannot be used. Searching
* starts by looking in the specified class, if the method is not found searching continues with
* the immediate parent and continues recurssively until the method is found or java.lang.Object
* is reached. If the method is not found a NoSuchMethodException is thrown.
*
* @param clazz
* @param methodName
* @param parameterTypes
* @return
* @throws NoSuchMethodException if the method is not found in this class or any of its parent classes
*/
private Method getMethod(Class clazz, final String methodName, final Class... parameterTypes) throws NoSuchMethodException {
NoSuchMethodException original = null;
while (clazz != null) {
try {
final Method method = clazz.getDeclaredMethod(methodName, parameterTypes);
return SetAccessible.on(method);
} catch (final NoSuchMethodException e) {
if (original == null) {
original = e;
}
}
clazz = clazz.getSuperclass();
}
throw original;
}
// -------------------------------------------------------------------
// Methods for sorting the bindings and callbacks
// -------------------------------------------------------------------
public static class IntercpetorBindingComparator implements Comparator {
public int compare(final InterceptorBindingInfo a, final InterceptorBindingInfo b) {
final Level levelA = level(a);
final Level levelB = level(b);
if (levelA != levelB) {
return levelA.ordinal() - levelB.ordinal();
}
// Now resort to secondary sorting.
return type(levelA, a).ordinal() - type(levelB, b).ordinal();
}
}
private static Level level(final InterceptorBindingInfo info) {
if (info.ejbName.equals("*")) {
return Level.PACKAGE;
}
if (info.method == null) {
return info.className == null ? Level.CLASS : Level.ANNOTATION_CLASS;
}
if (info.method.methodParams == null) {
return Level.OVERLOADED_METHOD;
}
return info.className == null ? Level.EXACT_METHOD : Level.ANNOTATION_METHOD;
}
private static Type type(final Level level, final InterceptorBindingInfo info) {
if (info.interceptorOrder.size() > 0) {
return Type.EXPLICIT_ORDERING;
}
if ((level == Level.CLASS || level == Level.ANNOTATION_CLASS) && info.excludeClassInterceptors && info.excludeDefaultInterceptors) {
return Type.SAME_AND_LOWER_EXCLUSION;
}
if ((level == Level.CLASS || level == Level.ANNOTATION_CLASS) && info.excludeClassInterceptors) {
return Type.SAME_LEVEL_EXCLUSION;
}
return Type.ADDITION_OR_LOWER_EXCLUSION;
}
public static class MethodCallbackComparator implements Comparator {
public int compare(final Method m1, final Method m2) {
final Class c1 = m1.getDeclaringClass();
final Class c2 = m2.getDeclaringClass();
if (c1.equals(c2)) {
return 0;
}
if (c1.isAssignableFrom(c2)) {
return -1;
}
return 1;
}
}
}
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