package tech.powerjob.server.common.utils;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.lang3.exception.ExceptionUtils;
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import org.aspectj.lang.JoinPoint;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.Signature;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
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import org.springframework.core.ParameterNameDiscoverer;
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import org.springframework.expression.EvaluationContext;
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import org.springframework.expression.Expression;
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import org.springframework.expression.ExpressionParser;
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import org.springframework.expression.spel.standard.SpelExpressionParser;
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import org.springframework.expression.spel.support.StandardEvaluationContext;
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import java.lang.reflect.Method;
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/**
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* AOP Utils
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*
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* @author tjq
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* @since 1/16/21
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*/
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@Slf4j
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public class AOPUtils {
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private static final ExpressionParser PARSER = new SpelExpressionParser();
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private static final ParameterNameDiscoverer DISCOVERER = new LocalVariableTableParameterNameDiscoverer();
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public static String parseRealClassName(JoinPoint joinPoint) {
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return joinPoint.getSignature().getDeclaringType().getSimpleName();
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}
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public static Method parseMethod(ProceedingJoinPoint joinPoint) {
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Signature pointSignature = joinPoint.getSignature();
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if (!(pointSignature instanceof MethodSignature)) {
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throw new IllegalArgumentException("this annotation should be used on a method!");
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}
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MethodSignature signature = (MethodSignature) pointSignature;
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Method method = signature.getMethod();
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if (method.getDeclaringClass().isInterface()) {
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try {
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method = joinPoint.getTarget().getClass().getDeclaredMethod(pointSignature.getName(), method.getParameterTypes());
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} catch (SecurityException | NoSuchMethodException e) {
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ExceptionUtils.rethrow(e);
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}
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}
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return method;
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}
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public static <T> T parseSpEl(Method method, Object[] arguments, String spEl, Class<T> clazz, T defaultResult) {
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String[] params = DISCOVERER.getParameterNames(method);
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assert params != null;
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EvaluationContext context = new StandardEvaluationContext();
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for (int len = 0; len < params.length; len++) {
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context.setVariable(params[len], arguments[len]);
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}
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try {
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Expression expression = PARSER.parseExpression(spEl);
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return expression.getValue(context, clazz);
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} catch (Exception e) {
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log.error("[AOPUtils] parse SpEL failed for method[{}], please concat @tjq to fix the bug!", method.getName(), e);
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return defaultResult;
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}
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}
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}
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