清除 Mule 4 中的缓存范围和私有对象存储

Question

I am building the application in Mule 4 to cache the response from http request component (for 1 hours). I use the response to validate the jwt. Whenever there is a failure, I need to clear the cache and re-invoke the http request. Component used is : Cache Scope

My Current Code looks like below:-

<ee:object-store-caching-strategy name="Caching_Strategy" doc:name="Caching Strategy" doc:id="50e44473-b55a-4bc3-b53a-18e4229a31a3" keyGenerationExpression="#['token']" >
        <os:private-object-store persistent="false" maxEntries="${caching.maxEntries}" entryTtl="${caching.entryTtl}" expirationInterval="${caching.expirationInterval}" />
    </ee:object-store-caching-strategy> 

I don't have any specific requirement to make it private object store but disabling it does not allow me to configure the maxEntries, entryTTL and Expiration Interval.

It would be more helpful if you could guide me the ways to

1. clear the cache (could not find any docs mule 4 related to clear the cache)
2. how can i keep it as non private object store and define those parameters like entryTtl, maxEntries etc.
3. when do we need to use the private object stores?

I have already tried the exchanges examples for configure the cache ( but there is no mention of clear the cache).

I am using Mule Runtime 4.2.2 and On Prem Mule

Answer 1

I have raised a support ticket with Mulesoft and received the below replies

1) Invalidate Cache is shown only in the palette from the Anypoint Studio Version 7.4.1. Not shown in earlier version of studio.( I was using 7.3.2)

2) They are adding the documentation for the invalidate cache in Mule 4.

3) Usage Note : Cache Scope and the 'Invalidate Cache' processor should share the same Caching_Strategy).

4) In order to explicitly define object store and ttl for a Cache Scope, please ensure object store related modules are added to the project. This can be done by simply adding a 'Store' processor in your mule flow, this will add all necessary modules to your mule application. Then, on the Caching Strategy, General > Reference > Object Store, you can select Edit Inline and define your object store with explicit settings such as - Max entries - Entry ttl - Expiration interval You can remove the unused 'Store' processor as well.

Hope it helps others

Answer 2

There is a palette called invalidate cache in the latest Mule versions. You can simply use it to delete the cache for a cache scope.

You will require a private object store when you want to persist the key used for caching permanently and also to implement time limits like TTL for a cache.