以实例变量和参数为键的Spring缓存 [英] Spring cache with instance variable and parameter as key

问题描述

我正在使用ehcache缓存方法结果。键必须是成员对象和方法参数的组合。我的班级看起来像这样：

I am using ehcache for caching the method results. The key has to be a combination of both member object and method's parameter. My class looks something like:

Class A {

private B b;

@Cacheable(value="someCache",key="some key based on B and C")
public Result getResult(C c){
......
}

我需要基于B和C的密钥。 b我提到了 https://code.google.com/ p / ehcache-spring-annotations / issues / detail？id = 69 ，但他们未指定如何在密钥生成中包括方法参数。有人可以帮我吗？

I need the key to be based on B and C. I referred https://code.google.com/p/ehcache-spring-annotations/issues/detail?id=69 but they did not specify how to include the method parameter in the key generation. Could someone help me with this?

推荐答案

我已经实现了自定义密钥生成器来解决这个问题。我仍然认为ehcache可以解决此问题，而无需使用自定义密钥生成器。但是我在任何地方都找不到答案。请在下面查看我的答案：

I have implemented a custom key generator to solve this. Still I think this can be solved by ehcache without using a custom key generator. But i could not get the answer anywhere. Please see my answer below:

@Component
public class Home {

    private Parameter param;

    @Cacheable(cacheName = "homeCache", 
                    keyGenerator = @KeyGenerator(name = "com.myapp.cache.Home.ParamKeyGenerator"))

    public Result getPerson(Person p) {

        //Do something with p
        return result;
    }

    public Parameter getParam() {

        return param;
    }

    public void setParam(Parameter param) {

        this.param = param;
    }

    public static class ParamKeyGenerator implements CacheKeyGenerator<Serializable> {

        public Serializable generateKey(MethodInvocation methodInvocation) {

            Object[] obj = methodInvocation.getArguments();
            Home h = (Home) methodInvocation.getThis();

            return this.generateKey(obj[0], h.getParam());
        }

        public Serializable generateKey(Object... data) {

            String key = ((Person) data[0]).getName() + ((Parameter) data[1]).getName();
            System.out.println("generating key: " + key);
            return key;
        }
    }
}

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