How does graphql apollo server uses memcached as a cache system? - express

Question

Following apollo documentation, I'm unable to get data from memcached with telnet commands. It seems like the data is cached because when I resend the same request the datasource doesn't call the APIs.
const server = new ApolloServer({
typeDefs,
resolvers,
cache: new MemcachedCache(
'127.0.0.1:11211',
{ retries: 10, retry: 10000 }, // Options
),
dataSources: () => ({
moviesAPI: new MoviesAPI(),
}),
});
I tried a manual implementation of memcached inside a dummy project and I was able to set/get data in the telnet interface.
Is the memcached queried by graphql or do we need to do it manually in the resolvers ?
Any help is welcome

Answer 1

The option to pass a cache into ApolloServer's initialization is optionl. With that being said , the cache highly downsized the speed of your database fetches.You have to pass the given cache in the initialization of any dataSource class, like this:
class DogCustomDataSource extends CustomDataSource{
constructor(models){
....
}
initialize({context,cache}){
this.context=context
this.cache=cache
}
}
Yes, you are right , subsequently, you have to set and delete objects to the cache in the methods of your dataSource, like this:
async get(id,{ttlInSeconds}={}){
.....
await this.cache.set("yourKey","yourValue",{ttl:ttlInSeconds})
//or
await this.cache.del("yourKey")
.....
}