in apm-sniffer/apm-sdk-plugin/dubbo-conflict-patch/src/main/java/org/apache/skywalking/apm/plugin/dubbo/patch/MakeWrapperInterceptor.java [64:266]
private static Wrapper makeWrapper(Class<?> c) {
if (c.isPrimitive())
throw new IllegalArgumentException("Can not create wrapper for primitive type: " + c);
String name = c.getName();
ClassLoader cl = ClassHelper.getClassLoader(c);
StringBuilder c1 = new StringBuilder("public void setPropertyValue(Object o, String n, Object v){ ");
StringBuilder c2 = new StringBuilder("public Object getPropertyValue(Object o, String n){ ");
StringBuilder c3 = new StringBuilder("public Object invokeMethod(Object o, String n, Class[] p, Object[] v) throws " + InvocationTargetException.class
.getName() + "{ ");
c1.append(name)
.append(" w; try{ w = ((")
.append(name)
.append(")$1); }catch(Throwable e){ throw new IllegalArgumentException(e); }");
c2.append(name)
.append(" w; try{ w = ((")
.append(name)
.append(")$1); }catch(Throwable e){ throw new IllegalArgumentException(e); }");
c3.append(name)
.append(" w; try{ w = ((")
.append(name)
.append(")$1); }catch(Throwable e){ throw new IllegalArgumentException(e); }");
Map<String, Class<?>> pts = new HashMap<String, Class<?>>(); // <property name, property types>
Map<String, Method> ms = new LinkedHashMap<String, Method>(); // <method desc, Method instance>
List<String> mns = new ArrayList<String>(); // method names.
List<String> dmns = new ArrayList<String>(); // declaring method names.
// get all public field.
for (Field f : c.getFields()) {
String fn = f.getName();
Class<?> ft = f.getType();
if (Modifier.isStatic(f.getModifiers()) || Modifier.isTransient(f.getModifiers()))
continue;
c1.append(" if( $2.equals(\"")
.append(fn)
.append("\") ){ w.")
.append(fn)
.append("=")
.append(arg(ft, "$3"))
.append("; return; }");
c2.append(" if( $2.equals(\"").append(fn).append("\") ){ return ($w)w.").append(fn).append("; }");
pts.put(fn, ft);
}
Method[] methods = c.getMethods();
// get all public method.
boolean hasMethod = hasMethods(methods);
if (hasMethod) {
c3.append(" try{");
}
for (Method m : methods) {
// ignore Object's method
// ignore EnhanceInstance's method
if (m.getDeclaringClass() == Object.class || "getSkyWalkingDynamicField".equals(m.getName()) || "setSkyWalkingDynamicField"
.equals(m.getName())) {
continue;
}
String mn = m.getName();
c3.append(" if( \"").append(mn).append("\".equals( $2 ) ");
int len = m.getParameterTypes().length;
c3.append(" && ").append(" $3.length == ").append(len);
boolean override = false;
for (Method m2 : methods) {
if (!m.equals(m2) && m.getName().equals(m2.getName())) {
override = true;
break;
}
}
if (override) {
if (len > 0) {
for (int l = 0; l < len; l++) {
c3.append(" && ")
.append(" $3[")
.append(l)
.append("].getName().equals(\"")
.append(m.getParameterTypes()[l].getName())
.append("\")");
}
}
}
c3.append(" ) { ");
if (m.getReturnType() == Void.TYPE)
c3.append(" w.")
.append(mn)
.append('(')
.append(args(m.getParameterTypes(), "$4"))
.append(");")
.append(" return null;");
else
c3.append(" return ($w)w.")
.append(mn)
.append('(')
.append(args(m.getParameterTypes(), "$4"))
.append(");");
c3.append(" }");
mns.add(mn);
if (m.getDeclaringClass() == c)
dmns.add(mn);
ms.put(ReflectUtils.getDesc(m), m);
}
if (hasMethod) {
c3.append(" } catch(Throwable e) { ");
c3.append(" throw new java.lang.reflect.InvocationTargetException(e); ");
c3.append(" }");
}
c3.append(" throw new " + NoSuchMethodException.class.getName() + "(\"Not found method \\\"\"+$2+\"\\\" in class " + c
.getName() + ".\"); }");
// deal with get/set method.
Matcher matcher;
for (Map.Entry<String, Method> entry : ms.entrySet()) {
String md = entry.getKey();
Method method = (Method) entry.getValue();
if ((matcher = ReflectUtils.GETTER_METHOD_DESC_PATTERN.matcher(md)).matches()) {
String pn = propertyName(matcher.group(1));
c2.append(" if( $2.equals(\"")
.append(pn)
.append("\") ){ return ($w)w.")
.append(method.getName())
.append("(); }");
pts.put(pn, method.getReturnType());
} else if ((matcher = ReflectUtils.IS_HAS_CAN_METHOD_DESC_PATTERN.matcher(md)).matches()) {
String pn = propertyName(matcher.group(1));
c2.append(" if( $2.equals(\"")
.append(pn)
.append("\") ){ return ($w)w.")
.append(method.getName())
.append("(); }");
pts.put(pn, method.getReturnType());
} else if ((matcher = ReflectUtils.SETTER_METHOD_DESC_PATTERN.matcher(md)).matches()) {
Class<?> pt = method.getParameterTypes()[0];
String pn = propertyName(matcher.group(1));
c1.append(" if( $2.equals(\"")
.append(pn)
.append("\") ){ w.")
.append(method.getName())
.append("(")
.append(arg(pt, "$3"))
.append("); return; }");
pts.put(pn, pt);
}
}
c1.append(" throw new " + NoSuchPropertyException.class.getName() + "(\"Not found property \\\"\"+$2+\"\\\" filed or setter method in class " + c
.getName() + ".\"); }");
c2.append(" throw new " + NoSuchPropertyException.class.getName() + "(\"Not found property \\\"\"+$2+\"\\\" filed or setter method in class " + c
.getName() + ".\"); }");
// make class
long id = WRAPPER_CLASS_COUNTER.getAndIncrement();
ClassGenerator cc = ClassGenerator.newInstance(cl);
cc.setClassName((Modifier.isPublic(c.getModifiers()) ? Wrapper.class.getName() + "_swEnhance" : c.getName() + "$sw$_swEnhance") + id);
cc.setSuperClass(Wrapper.class);
cc.addDefaultConstructor();
cc.addField("public static String[] pns;"); // property name array.
cc.addField("public static " + Map.class.getName() + " pts;"); // property type map.
cc.addField("public static String[] mns;"); // all method name array.
cc.addField("public static String[] dmns;"); // declared method name array.
for (int i = 0, len = ms.size(); i < len; i++)
cc.addField("public static Class[] mts" + i + ";");
cc.addMethod("public String[] getPropertyNames(){ return pns; }");
cc.addMethod("public boolean hasProperty(String n){ return pts.containsKey($1); }");
cc.addMethod("public Class getPropertyType(String n){ return (Class)pts.get($1); }");
cc.addMethod("public String[] getMethodNames(){ return mns; }");
cc.addMethod("public String[] getDeclaredMethodNames(){ return dmns; }");
cc.addMethod(c1.toString());
cc.addMethod(c2.toString());
cc.addMethod(c3.toString());
try {
Class<?> wc = cc.toClass();
// setup static field.
wc.getField("pts").set(null, pts);
wc.getField("pns").set(null, pts.keySet().toArray(new String[0]));
wc.getField("mns").set(null, mns.toArray(new String[0]));
wc.getField("dmns").set(null, dmns.toArray(new String[0]));
int ix = 0;
for (Method m : ms.values())
wc.getField("mts" + ix++).set(null, m.getParameterTypes());
return (Wrapper) wc.getDeclaredConstructor().newInstance();
} catch (RuntimeException e) {
throw e;
} catch (Throwable e) {
throw new RuntimeException(e.getMessage(), e);
} finally {
cc.release();
ms.clear();
mns.clear();
dmns.clear();
}
}