private String fixTypes2(
ArrayList<TypeVar> scc, HashSet<String> lowersSet, org.hotswap.agent.javassist.ClassPool cp)
throws org.hotswap.agent.javassist.NotFoundException {
Iterator<String> it = lowersSet.iterator();
if (lowersSet.size() == 0) {
return null; // only NullType
} else if (lowersSet.size() == 1) {
return it.next();
} else {
org.hotswap.agent.javassist.CtClass cc = cp.get(it.next());
while (it.hasNext()) {
cc = commonSuperClassEx(cc, cp.get(it.next()));
}
if (cc.getSuperclass() == null || isObjectArray(cc)) {
cc = fixByUppers(scc, cp, new HashSet<TypeVar>(), cc);
}
if (cc.isArray()) {
return org.hotswap.agent.javassist.bytecode.Descriptor.toJvmName(cc);
} else {
return cc.getName();
}
}
}
private org.hotswap.agent.javassist.CtClass fixByUppers(
ArrayList<TypeVar> users,
org.hotswap.agent.javassist.ClassPool cp,
HashSet<TypeVar> visited,
org.hotswap.agent.javassist.CtClass type)
throws org.hotswap.agent.javassist.NotFoundException {
if (users == null) {
return type;
}
int size = users.size();
for (int i = 0; i < size; i++) {
TypeVar t = users.get(i);
if (!visited.add(t)) {
return type;
}
if (t.uppers != null) {
int s = t.uppers.size();
for (int k = 0; k < s; k++) {
org.hotswap.agent.javassist.CtClass cc = cp.get(t.uppers.get(k));
if (cc.subtypeOf(type)) {
type = cc;
}
}
}
type = fixByUppers(t.usedBy, cp, visited, type);
}
return type;
}
@OnClassLoadEvent(classNameRegexp = "org.jboss.resteasy.plugins.server.servlet.FilterDispatcher")
public static void patchFilterDispatcher(CtClass ctClass, ClassPool classPool)
throws NotFoundException, CannotCompileException {
CtClass fltCfgClass = classPool.get("javax.servlet.FilterConfig");
CtField configField = new CtField(fltCfgClass, FIELD_NAME, ctClass);
ctClass.addField(configField);
CtClass setClass = classPool.get(java.util.Set.class.getName());
CtField paramsField = new CtField(setClass, PARAMETER_FIELD_NAME, ctClass);
ctClass.addField(paramsField);
CtMethod methInit = ctClass.getDeclaredMethod("init");
methInit.insertBefore(
"{"
+ " if(this."
+ PARAMETER_FIELD_NAME
+ " == null) {"
+ PluginManagerInvoker.buildInitializePlugin(ResteasyPlugin.class)
+ PluginManagerInvoker.buildCallPluginMethod(
ResteasyPlugin.class, "registerDispatcher", "this", "java.lang.Object")
+ " }"
+ " this."
+ FIELD_NAME
+ " = $1;"
+ " this."
+ PARAMETER_FIELD_NAME
+ " = "
+ ResteasyContextParams.class.getName()
+ ".init($1.getServletContext(), this."
+ PARAMETER_FIELD_NAME
+ "); "
+ "}");
}
// same as above for older jetty versions
@OnClassLoadEvent(classNameRegexp = "org.mortbay.jetty.webapp.WebXmlConfiguration")
public static void patchWebXmlConfiguration6x(CtClass ctClass)
throws NotFoundException, CannotCompileException, ClassNotFoundException {
try {
// after application context initialized, but before processing started
CtMethod doStart = ctClass.getDeclaredMethod("configureWebApp");
// init the plugin
String src =
PluginManagerInvoker.buildInitializePlugin(
JettyPlugin.class, "getWebAppContext().getClassLoader()");
src +=
PluginManagerInvoker.buildCallPluginMethod(
"getWebAppContext().getClassLoader()",
JettyPlugin.class,
"init",
"getWebAppContext()",
"java.lang.Object");
doStart.insertBefore(src);
} catch (NotFoundException e) {
LOGGER.warning(
"org.mortbay.jetty.webapp.WebXmlConfiguration does not contain startContext method. Jetty plugin will be disabled.\n"
+ "*** This is Ok, Jetty plugin handles only special properties ***");
return;
}
}
@OnClassLoadEvent(classNameRegexp = ".*", events = LoadEvent.REDEFINE)
public void entityReload(ClassLoader classLoader, CtClass clazz, Class original) {
if (AnnotationHelper.hasAnnotation(original, PATH_ANNOTATION)
|| AnnotationHelper.hasAnnotation(clazz, PATH_ANNOTATION)) {
LOGGER.debug(
"Reload @Path annotated class {}, original classloader {}",
clazz.getName(),
original.getClassLoader());
refresh(classLoader, 500);
}
}
/**
* Before actual webapp initialization starts in ContextHandler.doStart(), do some enhancements:
*
* <ul>
* <li>Initialize this plugin on the webapp classloader
* <li>Call plugin method initExtraPathClassLoader add urls and to start watching changed
* resources
* <li>Call plugin method registerExtraPathClassLoader to inject enhanced resource loader to the
* webapp classloader.
* </ul>
*/
@Transform(classNameRegexp = "org.apache.catalina.core.StandardContext")
public static void patchStandardContext(CtClass ctClass)
throws NotFoundException, CannotCompileException, ClassNotFoundException {
try {
// force disable caching
ctClass.getDeclaredMethod("isCachingAllowed").setBody("return false;");
} catch (NotFoundException e) {
LOGGER.debug(
"org.apache.catalina.core.StandardContext does not contain isCachingAllowed() method. Probably Ok.");
}
try {
ctClass
.getDeclaredMethod("stopInternal")
.insertBefore(
PluginManagerInvoker.buildCallCloseClassLoader("getLoader().getClassLoader()"));
} catch (NotFoundException e) {
LOGGER.debug(
"org.apache.catalina.core.StandardContext does not contain stopInternal() method. Hotswap agent will not be able to free Tomcat plugin resources.");
}
}
/** Before app context is stopped, clean the classloader (and associated plugin instance). */
@OnClassLoadEvent(
classNameRegexp =
"(org.mortbay.jetty.webapp.WebAppContext)|(org.eclipse.jetty.webapp.WebAppContext)")
public static void patchContextHandler6x(CtClass ctClass)
throws NotFoundException, CannotCompileException, ClassNotFoundException {
try {
ctClass
.getDeclaredMethod("doStop")
.insertBefore(PluginManagerInvoker.buildCallCloseClassLoader("getClassLoader()"));
} catch (NotFoundException e) {
LOGGER.debug(
"org.eclipse.jetty.webapp.WebAppContext does not contain doStop() method. Hotswap agent will not be able to free Jetty plugin resources.");
}
}
/** Init the plugin from start method. */
@Transform(classNameRegexp = "org.apache.catalina.loader.WebappLoader")
public static void patchWebappLoader(CtClass ctClass)
throws NotFoundException, CannotCompileException, ClassNotFoundException {
try {
CtMethod startInternalMethod = ctClass.getDeclaredMethod("startInternal");
// init the plugin
String src = PluginManagerInvoker.buildInitializePlugin(TomcatPlugin.class, "classLoader");
startInternalMethod.insertAfter(src);
} catch (NotFoundException e) {
LOGGER.warning(
"org.apache.catalina.loader.WebappLoader does not contain startInternal method. Tomcat plugin will be disabled.\n"
+ "*** This is Ok, Tomcat plugin handles only special properties ***");
return;
}
}
/** Run plugin the method. */
public void onWatchEvent(
PluginAnnotation<T> pluginAnnotation, WatchFileEvent event, ClassLoader classLoader) {
final T annot = pluginAnnotation.getAnnotation();
Object plugin = pluginAnnotation.getPlugin();
// regular files filter
if (watchEventDTO.isOnlyRegularFiles() && !event.isFile()) {
LOGGER.trace("Skipping URI {} because it is not a regular file.", event.getURI());
return;
}
// watch type filter
if (!Arrays.asList(watchEventDTO.getEvents()).contains(event.getEventType())) {
LOGGER.trace("Skipping URI {} because it is not a requested event.", event.getURI());
return;
}
// resource name filter regexp
if (watchEventDTO.getFilter() != null && watchEventDTO.getFilter().length() > 0) {
if (!event.getURI().toString().matches(watchEventDTO.getFilter())) {
LOGGER.trace(
"Skipping URI {} because it does not match filter.",
event.getURI(),
watchEventDTO.getFilter());
return;
}
}
// we may need to crate CtClass on behalf of the client and close it after invocation.
CtClass ctClass = null;
// class file regexp
if (watchEventDTO.isClassFileEvent()) {
try {
// TODO creating class only to check name may slow down if lot of handlers is in use.
ctClass = createCtClass(event.getURI(), classLoader);
} catch (Exception e) {
LOGGER.error("Unable create CtClass for URI '{}'.", e, event.getURI());
return;
}
// unable to create CtClass or it's name does not match
if (ctClass == null || !ctClass.getName().matches(watchEventDTO.getClassNameRegexp())) return;
}
LOGGER.debug(
"Executing resource changed method {} on class {} for event {}",
pluginAnnotation.getMethod().getName(),
plugin.getClass().getName(),
event);
List<Object> args = new ArrayList<Object>();
for (Class<?> type : pluginAnnotation.getMethod().getParameterTypes()) {
if (type.isAssignableFrom(ClassLoader.class)) {
args.add(classLoader);
} else if (type.isAssignableFrom(URI.class)) {
args.add(event.getURI());
} else if (type.isAssignableFrom(URL.class)) {
try {
args.add(event.getURI().toURL());
} catch (MalformedURLException e) {
LOGGER.error("Unable to convert URI '{}' to URL.", e, event.getURI());
return;
}
} else if (type.isAssignableFrom(ClassPool.class)) {
args.add(ClassPool.getDefault());
} else if (type.isAssignableFrom(FileEvent.class)) {
args.add(event.getEventType());
} else if (watchEventDTO.isClassFileEvent() && type.isAssignableFrom(CtClass.class)) {
args.add(ctClass);
} else if (watchEventDTO.isClassFileEvent() && type.isAssignableFrom(String.class)) {
args.add(ctClass.getName());
} else {
LOGGER.error(
"Unable to call method {} on plugin {}. Method parameter type {} is not recognized.",
pluginAnnotation.getMethod().getName(),
plugin.getClass().getName(),
type);
return;
}
}
try {
pluginAnnotation.getMethod().invoke(plugin, args.toArray());
// close CtClass if created from here
if (ctClass != null) {
ctClass.detach();
}
} catch (IllegalAccessException e) {
LOGGER.error(
"IllegalAccessException in method {} on plugin {}",
e,
pluginAnnotation.getMethod().getName(),
plugin.getClass().getName());
} catch (InvocationTargetException e) {
LOGGER.error(
"InvocationTargetException in method {} on plugin {}",
e,
pluginAnnotation.getMethod().getName(),
plugin.getClass().getName());
}
}
static boolean eq(
org.hotswap.agent.javassist.CtClass one, org.hotswap.agent.javassist.CtClass two) {
return one == two || one != null && two != null && one.getName().equals(two.getName());
}
/**
* Finds the most specific common super class of the given classes. This method is a copy from
* Type.
*/
public static org.hotswap.agent.javassist.CtClass commonSuperClass(
org.hotswap.agent.javassist.CtClass one, org.hotswap.agent.javassist.CtClass two)
throws org.hotswap.agent.javassist.NotFoundException {
org.hotswap.agent.javassist.CtClass deep = one;
org.hotswap.agent.javassist.CtClass shallow = two;
org.hotswap.agent.javassist.CtClass backupShallow = shallow;
org.hotswap.agent.javassist.CtClass backupDeep = deep;
// Phase 1 - Find the deepest hierarchy, set deep and shallow correctly
for (; ; ) {
// In case we get lucky, and find a match early
if (eq(deep, shallow) && deep.getSuperclass() != null) {
return deep;
}
org.hotswap.agent.javassist.CtClass deepSuper = deep.getSuperclass();
org.hotswap.agent.javassist.CtClass shallowSuper = shallow.getSuperclass();
if (shallowSuper == null) {
// right, now reset shallow
shallow = backupShallow;
break;
}
if (deepSuper == null) {
// wrong, swap them, since deep is now useless, its our tmp
// before we swap it
deep = backupDeep;
backupDeep = backupShallow;
backupShallow = deep;
deep = shallow;
shallow = backupShallow;
break;
}
deep = deepSuper;
shallow = shallowSuper;
}
// Phase 2 - Move deepBackup up by (deep end - deep)
for (; ; ) {
deep = deep.getSuperclass();
if (deep == null) {
break;
}
backupDeep = backupDeep.getSuperclass();
}
deep = backupDeep;
// Phase 3 - The hierarchy positions are now aligned
// The common super class is easy to find now
while (!eq(deep, shallow)) {
deep = deep.getSuperclass();
shallow = shallow.getSuperclass();
}
return deep;
}
/** Finds the most specific common super class of the given classes by considering array types. */
public static org.hotswap.agent.javassist.CtClass commonSuperClassEx(
org.hotswap.agent.javassist.CtClass one, org.hotswap.agent.javassist.CtClass two)
throws org.hotswap.agent.javassist.NotFoundException {
if (one == two) {
return one;
} else if (one.isArray() && two.isArray()) {
org.hotswap.agent.javassist.CtClass ele1 = one.getComponentType();
org.hotswap.agent.javassist.CtClass ele2 = two.getComponentType();
org.hotswap.agent.javassist.CtClass element = commonSuperClassEx(ele1, ele2);
if (element == ele1) {
return one;
} else if (element == ele2) {
return two;
} else {
return one.getClassPool()
.get(element == null ? "java.lang.Object" : element.getName() + "[]");
}
} else if (one.isPrimitive() || two.isPrimitive()) {
return null; // TOP
} else if (one.isArray() || two.isArray()) {
// two.isArray())
return one.getClassPool().get("java.lang.Object");
} else {
return commonSuperClass(one, two);
}
}
private static boolean isObjectArray(org.hotswap.agent.javassist.CtClass cc)
throws org.hotswap.agent.javassist.NotFoundException {
return cc.isArray() && cc.getComponentType().getSuperclass() == null;
}
