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Pax Web JSP/EL/JSTL Support via Tomcat Jasper 2.
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/*
* Licensed 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.
*/
package org.ops4j.pax.web.jsp;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.WeakHashMap;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.servlet.Filter;
import org.apache.jasper.security.SecurityUtil;
public class InstanceManager implements org.apache.tomcat.InstanceManager {
private final Map> injectionMap = new HashMap<>();
private final Properties restrictedFilters = new Properties();
private final Properties restrictedListeners = new Properties();
private final Map, List> annotationCache = new WeakHashMap<>();
@Override
public Object newInstance(String className) throws IllegalAccessException,
InvocationTargetException, InstantiationException,
ClassNotFoundException, NoSuchMethodException {
ClassLoader classLoader = Thread.currentThread()
.getContextClassLoader();
Class clazz = loadClassMaybePrivileged(className, classLoader);
return newInstance(clazz.getConstructor().newInstance(), clazz);
}
@Override
public Object newInstance(final String className,
final ClassLoader classLoader) throws IllegalAccessException,
InvocationTargetException, InstantiationException,
ClassNotFoundException, NoSuchMethodException {
Class clazz = classLoader.loadClass(className);
return newInstance(clazz.getConstructor().newInstance(), clazz);
}
@Override
public void newInstance(Object o) throws IllegalAccessException,
InvocationTargetException {
newInstance(o, o.getClass());
}
@Override
public Object newInstance(Class clazz) throws IllegalAccessException,
InvocationTargetException, InstantiationException {
Object instance;
try {
instance = newInstance(clazz.getName());
} catch (ClassNotFoundException | NoSuchMethodException e) {
throw new InstantiationException("can't create object for class "
+ clazz);
}
return newInstance(instance, clazz);
}
private Object newInstance(Object instance, Class clazz)
throws IllegalAccessException, InvocationTargetException {
Map injections = injectionMap.get(clazz.getName());
populateAnnotationsCache(clazz, injections);
return instance;
}
@Override
public void destroyInstance(Object instance) throws IllegalAccessException,
InvocationTargetException {
preDestroy(instance, instance.getClass());
}
/**
* Call preDestroy method on the specified instance recursively from deepest
* superclass to actual class.
*
* @param instance object to call preDestroy methods on
* @param clazz (super) class to examine for preDestroy annotation.
* @throws IllegalAccessException if preDestroy method is inaccessible.
* @throws java.lang.reflect.InvocationTargetException if call fails
*/
protected void preDestroy(Object instance, final Class clazz)
throws IllegalAccessException, InvocationTargetException {
Class superClass = clazz.getSuperclass();
if (superClass != Object.class) {
preDestroy(instance, superClass);
}
// At the end the postconstruct annotated
// method is invoked
List annotations = null;
synchronized (annotationCache) {
annotations = annotationCache.get(clazz);
}
if (annotations == null) {
// instance not created through the instance manager
return;
}
for (AnnotationCacheEntry entry : annotations) {
if (entry.getType() == AnnotationCacheEntryType.PRE_DESTROY) {
Method preDestroy = getMethod(clazz, entry);
synchronized (preDestroy) {
boolean accessibility = preDestroy.canAccess(instance);
preDestroy.setAccessible(true);
preDestroy.invoke(instance);
preDestroy.setAccessible(accessibility);
}
}
}
}
/**
* Make sure that the annotations cache has been populated for the provided
* class.
*
* @param clazz clazz to populate annotations for
* @param injections map of injections for this class from xml deployment
* descriptor
* @throws IllegalAccessException if injection target is inaccessible
* @throws java.lang.reflect.InvocationTargetException if injection fails
*/
protected void populateAnnotationsCache(Class clazz,
Map injections) throws IllegalAccessException,
InvocationTargetException {
while (clazz != null) {
List annotations = null;
synchronized (annotationCache) {
annotations = annotationCache.get(clazz);
}
if (annotations == null) {
annotations = new ArrayList<>();
// Initialize methods annotations
Method[] methods = null;
methods = clazz.getDeclaredMethods();
Method postConstruct = null;
Method preDestroy = null;
for (Method method : methods) {
if (method.isAnnotationPresent(PostConstruct.class)) {
if ((postConstruct != null)
|| (method.getParameterTypes().length != 0)
|| (Modifier.isStatic(method.getModifiers()))
|| (method.getExceptionTypes().length > 0)
|| (!method.getReturnType().getName()
.equals("void"))) {
throw new IllegalArgumentException(
"Invalid PostConstruct annotation");
}
postConstruct = method;
}
if (method.isAnnotationPresent(PreDestroy.class)) {
if ((preDestroy != null || method.getParameterTypes().length != 0)
|| (Modifier.isStatic(method.getModifiers()))
|| (method.getExceptionTypes().length > 0)
|| (!method.getReturnType().getName()
.equals("void"))) {
throw new IllegalArgumentException(
"Invalid PreDestroy annotation");
}
preDestroy = method;
}
}
if (postConstruct != null) {
annotations.add(new AnnotationCacheEntry(postConstruct
.getName(), postConstruct.getParameterTypes(),
null, AnnotationCacheEntryType.POST_CONSTRUCT));
}
if (preDestroy != null) {
annotations.add(new AnnotationCacheEntry(preDestroy
.getName(), preDestroy.getParameterTypes(), null,
AnnotationCacheEntryType.PRE_DESTROY));
}
if (annotations.size() == 0) {
// Use common empty list to save memory
annotations = Collections.emptyList();
}
synchronized (annotationCache) {
annotationCache.put(clazz, annotations);
}
}
// CHECKSTYLE:OFF
clazz = clazz.getSuperclass();
// CHECKSTYLE:ON
}
}
/**
* Makes cache size available to unit tests.
*/
protected int getAnnotationCacheSize() {
synchronized (annotationCache) {
return annotationCache.size();
}
}
protected Class loadClassMaybePrivileged(final String className,
final ClassLoader classLoader) throws ClassNotFoundException {
Class clazz;
if (SecurityUtil.isPackageProtectionEnabled()) {
try {
clazz = AccessController
.doPrivileged(new PrivilegedExceptionAction>() {
@Override
public Class run() throws Exception {
return classLoader.loadClass(className);
}
});
} catch (PrivilegedActionException e) {
Throwable t = e.getCause();
if (t instanceof ClassNotFoundException) {
throw (ClassNotFoundException) t;
}
throw new RuntimeException(t);
}
} else {
clazz = classLoader.loadClass(className);
}
checkAccess(clazz);
return clazz;
}
private void checkAccess(Class clazz) {
if (Filter.class.isAssignableFrom(clazz)) {
checkAccess(clazz, restrictedFilters);
} else {
checkAccess(clazz, restrictedListeners);
}
}
private void checkAccess(Class clazz, Properties restricted) {
while (clazz != null) {
if ("restricted".equals(restricted.getProperty(clazz.getName()))) {
throw new SecurityException("Restricted " + clazz);
}
// CHECKSTYLE:OFF
clazz = clazz.getSuperclass();
// CHECKSTYLE:ON
}
}
public static String getName(Method setter) {
StringBuilder name = new StringBuilder(setter.getName());
// remove 'set'
name.delete(0, 3);
// lowercase first char
name.setCharAt(0, Character.toLowerCase(name.charAt(0)));
return name.toString();
}
private static Method getMethod(final Class clazz,
final AnnotationCacheEntry entry) {
Method result = null;
try {
result = clazz.getDeclaredMethod(entry.getAccessibleObjectName(),
entry.getParamTypes());
} catch (NoSuchMethodException e) {
// Should never happen. On that basis don't log it.
}
return result;
}
private static final class AnnotationCacheEntry {
private final String accessibleObjectName;
private final Class[] paramTypes;
private final AnnotationCacheEntryType type;
AnnotationCacheEntry(String accessibleObjectName,
Class[] paramTypes, String name,
AnnotationCacheEntryType type) {
this.accessibleObjectName = accessibleObjectName;
if (paramTypes != null) {
this.paramTypes = Arrays.copyOf(paramTypes, paramTypes.length);
} else {
this.paramTypes = null;
}
this.type = type;
}
public String getAccessibleObjectName() {
return accessibleObjectName;
}
public Class[] getParamTypes() {
return paramTypes;
}
public AnnotationCacheEntryType getType() {
return type;
}
}
private enum AnnotationCacheEntryType {
FIELD, SETTER, POST_CONSTRUCT, PRE_DESTROY
}
}