package org.jeecg.boot.starter.lock.aspect;
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import lombok.extern.slf4j.Slf4j;
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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.util.ArrayList;
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import java.util.List;
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/**
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* @author zyf
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*/
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@Slf4j
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public class BaseAspect {
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/**
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* 通过spring SpEL 获取参数
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*
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* @param key 定义的key值 以#开头 例如:#user
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* @param parameterNames 形参
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* @param values 形参值
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* @param keyConstant key的常亮
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* @return
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*/
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public List<String> getValueBySpEL(String key, String[] parameterNames, Object[] values, String keyConstant) {
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List<String> keys = new ArrayList<>();
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if (!key.contains("#")) {
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String s = "redis:lock:" + key + keyConstant;
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log.info("lockKey:" + s);
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keys.add(s);
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return keys;
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}
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//spel解析器
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ExpressionParser parser = new SpelExpressionParser();
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//spel上下文
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EvaluationContext context = new StandardEvaluationContext();
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for (int i = 0; i < parameterNames.length; i++) {
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context.setVariable(parameterNames[i], values[i]);
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}
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Expression expression = parser.parseExpression(key);
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Object value = expression.getValue(context);
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if (value != null) {
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if (value instanceof List) {
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List value1 = (List) value;
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for (Object o : value1) {
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addKeys(keys, o, keyConstant);
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}
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} else if (value.getClass().isArray()) {
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Object[] obj = (Object[]) value;
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for (Object o : obj) {
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addKeys(keys, o, keyConstant);
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}
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} else {
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addKeys(keys, value, keyConstant);
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}
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}
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log.info("表达式key={},value={}", key, keys);
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return keys;
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}
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private void addKeys(List<String> keys, Object o, String keyConstant) {
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keys.add("redis:lock:" + o.toString() + keyConstant);
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}
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}
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