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com.jdon.container.interceptor.BeforeAfterMethodTarget Maven / Gradle / Ivy
/*
* Copyright 2003-2009 the original author or authors.
* 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 com.jdon.container.interceptor;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import net.sf.cglib.proxy.MethodProxy;
import com.jdon.annotation.pointcut.After;
import com.jdon.annotation.pointcut.Before;
import com.jdon.annotation.pointcut.method.Input;
import com.jdon.annotation.pointcut.method.Returning;
import com.jdon.container.pico.Startable;
import com.jdon.util.Debug;
/**
* @Interceptor("myInterceptor") public class A implements AInterface {
* @AdviceBefore("testOne") public Object myMethod(@Input() Object inVal,
* @Returning() Object returnVal) {
*
* }
* @Component("myInterceptor") public class MyInterceptor {
*
* public Object testOne(Object inVal) { }
*
*
* @author banq
*
*/
public class BeforeAfterMethodTarget implements Startable {
private final static String module = BeforeAfterMethodTarget.class.getName();
private Object target;
private Object interceptor;
private IntroduceInfo iinfo;
public BeforeAfterMethodTarget(Object target, Object interceptor, IntroduceInfo iinfo) {
super();
this.target = target;
this.interceptor = interceptor;
this.iinfo = iinfo;
}
public Object invoke(Method invokedmethod, Object[] args, MethodProxy methodProxy) throws Throwable, Exception {
if (invokedmethod.getName().equals("finalize")) {
return null;
}
Object result = null;
try {
Debug.logVerbose("[JdonFramework] enter FixedMethodInvocation", module);
if (iinfo != null) {
Method adviceBeforeTargetMethod = getAdviceBeforeTargetMethod(target, iinfo, invokedmethod);
if (adviceBeforeTargetMethod != null && adviceBeforeTargetMethod.getName().equals(invokedmethod.getName())) {
Object returning = doBefore(adviceBeforeTargetMethod, args, interceptor, iinfo);
injectOriginReturning(returning, adviceBeforeTargetMethod, args, iinfo);
}
}
// result = methodProxy.invoke(target, args);
result = methodProxy.invoke(target, args);
if (iinfo != null) {
Method adviceAfterTargetMethod = getAdviceAfterTargetMethod(target, iinfo, invokedmethod);
if (adviceAfterTargetMethod != null && adviceAfterTargetMethod.getName().equals(invokedmethod.getName())) {
result = doAfter(adviceAfterTargetMethod, result, iinfo, interceptor);
}
}
Debug.logVerbose("<----->FixedMethodInvocation end:", module);
} catch (Exception ex) {
Debug.logError(ex, module);
throw new Exception(ex);
} catch (Throwable ex) {
throw new Throwable(ex);
}
return result;
}
private Method getAdviceBeforeTargetMethod(Object target, IntroduceInfo iinfo, Method invokedmethod) {
Method m = iinfo.getBefores().get(invokedmethod.getName());
if (m != null)
return m;
for (Method method : target.getClass().getMethods()) {
if (method.isAnnotationPresent(Before.class)) {
m = method;
iinfo.getBefores().put(invokedmethod.getName(), method);
}
}
return m;
}
private Method getAdviceAfterTargetMethod(Object target, IntroduceInfo iinfo, Method invokedmethod) {
Method m = iinfo.getAfters().get(invokedmethod.getName());
if (m != null)
return m;
for (Method method : target.getClass().getMethods()) {
if (method.isAnnotationPresent(After.class)) {
m = method;
iinfo.getAfters().put(invokedmethod.getName(), method);
}
}
return m;
}
private Object doBefore(Method adviceBeforeTargetMethod, Object[] targetParameters, Object interceptor, IntroduceInfo iinfo) {
Object returning = null;
try {
Before before = adviceBeforeTargetMethod.getAnnotation(Before.class);
Method interceptorMethod = iinfo.getMethods().get(adviceBeforeTargetMethod);
if (interceptorMethod == null) {
for (Method interceptorMethod2 : interceptor.getClass().getMethods()) {
String mName = interceptorMethod2.getName();
if (before.value().equals(mName)) {
interceptorMethod = interceptorMethod2;
break;
}
}
iinfo.getMethods().put(adviceBeforeTargetMethod, interceptorMethod);
}
returning = executeBeforeAdvice(adviceBeforeTargetMethod, targetParameters, interceptorMethod, interceptor, iinfo);
} catch (Exception e) {
Debug.logError("[JdonFramework]doBefore error: " + e, module);
}
return returning;
}
private Object executeBeforeAdvice(Method invokedmethod, Object[] targetParameters, Method interceptorMethod, Object interceptor,
IntroduceInfo iinfo) {
Object returning = null;
try {
Class[] iParamTypes = interceptorMethod.getParameterTypes();
Object[] args = new Object[iParamTypes.length];
Object requiredParam = getInputparameter(invokedmethod, targetParameters, interceptorMethod, iinfo);
Integer posIn = iinfo.getIntroducedParametersPositions().get(interceptorMethod.getName());
args[posIn] = requiredParam;
returning = interceptorMethod.invoke(interceptor, args);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return returning;
}
private Object getInputparameter(Method method, Object[] targetParameters, Method interceptorMethod, IntroduceInfo iinfo) {
Object input = null;
Integer posIn = iinfo.getInputParametersPositions().get(method.getName());
if (posIn != null) {
input = targetParameters[posIn];
return input;
}
try {
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
Class[] parameterTypes = method.getParameterTypes();
int i = 0;
for (Annotation[] annotations : parameterAnnotations) {
for (Annotation annotation : annotations) {
if (annotation instanceof Input) {
Class[] iParamTypes = interceptorMethod.getParameterTypes();
for (int j = 0; j < iParamTypes.length; j++) {
if (iParamTypes[j].isAssignableFrom(parameterTypes[i]) && parameterTypes[i] != null) {
input = targetParameters[i];
iinfo.getInputParametersPositions().put(method.getName(), i);
iinfo.getIntroducedParametersPositions().put(interceptorMethod.getName(), j);
break;
}
}
}
}
i++;
}
} catch (Exception e) {
Debug.logError("getInputparameter" + e, module);
}
return input;
}
private void injectOriginReturning(Object returning, Method adviceBeforeTargetMethod, Object[] targetParameters, IntroduceInfo iinfo) {
if (returning == null)
return;
Integer posIn = iinfo.getReturnParametersPositions().get(adviceBeforeTargetMethod.getName());
if (posIn != null) {
targetParameters[posIn] = returning;
return;
}
try {
Annotation[][] parameterAnnotations = adviceBeforeTargetMethod.getParameterAnnotations();
int i = 0;
for (Annotation[] annotations : parameterAnnotations) {
for (Annotation annotation : annotations) {
if (annotation instanceof Returning) {
if (targetParameters[i] != null && targetParameters[i].getClass().isAssignableFrom(returning.getClass())) {
targetParameters[i] = returning;
iinfo.getReturnParametersPositions().put(adviceBeforeTargetMethod.getName(), i);
break;
}
}
}
i++;
}
} catch (Exception e) {
Debug.logError("injectOriginReturning" + e, module);
}
}
private Object doAfter(Method adviceAfterTargetMethod, Object result, IntroduceInfo iinfo, Object interceptor) {
Object resultReturning = null;
try {
After after = adviceAfterTargetMethod.getAnnotation(After.class);
Method interceptorMethod = iinfo.getMethods().get(adviceAfterTargetMethod.getName());
if (interceptorMethod == null) {
for (Method interceptorMethod2 : interceptor.getClass().getMethods()) {
String mName = interceptorMethod2.getName();
if (after.value().equals(mName)) {
interceptorMethod = interceptorMethod2;
break;
}
}
iinfo.getMethods().put(adviceAfterTargetMethod, interceptorMethod);
}
resultReturning = execAfterAdvice(result, interceptorMethod, interceptor, iinfo);
} catch (Exception e) {
Debug.logError("[JdonFramework]doAfter error: " + e, module);
}
return resultReturning;
}
private Object execAfterAdvice(Object result, Method interceptorMethod, Object interceptor, IntroduceInfo iinfo) {
Object resultReturning = null;
try {
Object[] args = getInjectResturingIntoAdvice(result, interceptorMethod, iinfo);
resultReturning = interceptorMethod.invoke(interceptor, args);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return resultReturning;
}
private Object[] getInjectResturingIntoAdvice(Object result, Method interceptorMethod, IntroduceInfo iinfo) {
Class[] iParamTypes = interceptorMethod.getParameterTypes();
Object[] args = new Object[iParamTypes.length];
Integer posIn = iinfo.getIntroducedParametersPositions().get(interceptorMethod.getName());
if (posIn != null) {
args[posIn] = result;
return args;
}
try {
for (int i = 0; i < iParamTypes.length; i++) {
if (iParamTypes[i].isAssignableFrom(result.getClass())) {
args[i] = result;
iinfo.getIntroducedParametersPositions().put(interceptorMethod.getName(), i);
}
}
} catch (Exception e) {
Debug.logError("getInjectResturingIntoAdvice" + e, module);
}
return args;
}
public void clear() {
if (iinfo != null) {
this.iinfo.clear();
this.iinfo = null;
}
if (interceptor != null) {
if (interceptor instanceof Startable) {
Startable st = (Startable) interceptor;
try {
st.stop();
} catch (Exception e) {
}
}
this.interceptor = null;
}
if (target != null) {
if (target instanceof Startable) {
Startable st = (Startable) target;
try {
st.stop();
} catch (Exception e) {
}
}
this.target = null;
}
}
@Override
public void start() {
// TODO Auto-generated method stub
}
@Override
public void stop() {
clear();
}
}
