/**
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* Copyright © 2018 organization 苞米豆
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* <p>
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* <p>
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* http://www.apache.org/licenses/LICENSE-2.0
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* <p>
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cn.besteam.common.aspect;
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import cn.besteam.common.aspect.annotation.LockApi;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.springframework.context.expression.MethodBasedEvaluationContext;
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import org.springframework.core.DefaultParameterNameDiscoverer;
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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.ExpressionParser;
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import org.springframework.expression.common.TemplateParserContext;
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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 org.springframework.util.StringUtils;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* 分布式锁Key生成器
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*
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*
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* @author chenqilong
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* @since 2019/4/19
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*/
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public class LockKeyGenerator {
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private static final ParameterNameDiscoverer NAME_DISCOVERER = new DefaultParameterNameDiscoverer();
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private static final ExpressionParser PARSER = new SpelExpressionParser();
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public String getKeyName(ProceedingJoinPoint joinPoint, LockApi lockApi) {
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StringBuilder sb = new StringBuilder();
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MethodSignature signature = (MethodSignature) joinPoint.getSignature();
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Method method = signature.getMethod();
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sb.append(method.getDeclaringClass().getName()).append(".").append(method.getName());
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if (lockApi.keys().length > 1 || !"".equals(lockApi.keys()[0])) {
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sb.append(getSpelDefinitionKey(lockApi.keys(), method, joinPoint.getArgs()));
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}
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return sb.toString();
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}
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private String getSpelDefinitionKey(String[] definitionKeys, Method method, Object[] parameterValues) {
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EvaluationContext context = new MethodBasedEvaluationContext(null, method, parameterValues, NAME_DISCOVERER);
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List<String> definitionKeyList = new ArrayList<>(definitionKeys.length);
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for (String definitionKey : definitionKeys) {
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if (definitionKey != null && !definitionKey.isEmpty()) {
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String key = PARSER.parseExpression(definitionKey).getValue(context).toString();
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definitionKeyList.add(key);
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}
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}
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return StringUtils.collectionToDelimitedString(definitionKeyList, ".", "", "");
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}
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public static void main(String[] args) {
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class Simple {
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public int val = 500;
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}
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Simple simple = new Simple();
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String el = "#{val > 100 && val < 400}";
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EvaluationContext context = new StandardEvaluationContext(simple);
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Object value = PARSER.parseExpression(el, new TemplateParserContext()).getValue(context);
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System.out.println(value);
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}
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}
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