The long-awaited plug-in module is here, in this module you can use their imagination, brainstorming, custom plug-ins, according to their own project preferences to develop some good plug-ins, as long as there is value, can be submitted to the PR, the review can become EE contributors, the plug-in can be used by developers worldwide.

Caution

• Plugin modules should be independent of other modules, especially the core module
• Plugin modules should not overly modify other modules code, if there are changes, need to assess the impact of the scope
• Plug-in module as far as possible to do configurable, not configured to open, not to affect the operation of other modules and performance security, etc.

Interceptor plug-in

This plugin was contributed by open source team member: Mr. Lu

Applicable scenarios

Need to do special preprocessing for some methods, for example:

• Need to delete data in the implementation of the operation before the need to verify user permissions, or record the operation records, etc.
• Need to execute the query before the append some special parameters, such as logical deletion In short, it is a variety of APIs provided by EE to enhance the AOP pre-interception.

requirements background

need to intercept the framework provides the selectList method , and then the query parameters in this method to append the logical deletion of the undeleted state as a query condition

Example of use

Add a new interceptor , the @Intercepts annotation specifies the intercepted method list , the @Signature annotation specifies the intercepted class , method , parameters and other information .

@Intercepts(
        {
                @Signature(type = BaseEsMapper.class, method = "selectList", args = {LambdaEsQueryWrapper.class}),
        }
)
@Component
public class QueryInterceptor implements Interceptor {

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        System.out.println("Ahhhhhh, I intercepted the query, add the query condition uniformly");
        // query conditions uniformly add logic to delete the state as not deleted
        Object[] args = invocation.getArgs();
        LambdaEsQueryWrapper<GeneralBean> arg = (LambdaEsQueryWrapper) args[0];
        arg.eq(GeneralBean::getExistStatus, true);
        return invocation.proceed();
    }

}

提示

1. you need to add @Component annotation to this interceptor and add it to Spring container, otherwise this interceptor will not work.
2. the full path of the implemented Interceptor is: com.xpc.easyes.sample.interceptor, not other interceptors with the same name.

Suggestions for improvement

The granularity is too fine, does not support wildcards, for example, I want to intercept 5 methods prefixed with selectXXX, I need to configure 5 times by annotation to achieve, Subsequent suggestions can support wildcard interception, such as through select * intercept all methods in the specified class to select first. Subsequent iterations if I have time to optimize here, if there are developers interested in submitting improved code, contribute PR!