how to use a shared cache in okhttp

Question

Is it possible to use the okhttp cache in a shared manner, ie: having multiple clients accessing the same cache directory in order to avoid having to each keep their own.

In the repices of the okhttp wiki we find:

It is an error to have multiple caches accessing the same cache directory simultaneously

I am not looking for different caches to use the same folder, but rather a single shared cache that can be updated by more than one client.

A simple example would be (in Java) running:

    Cache cache = new Cache(cacheDirectory, cacheSize);

    client  = new OkHttpClient.Builder().cache(cache).build();
    client2 = new OkHttpClient.Builder().cache(cache).build();

Would this be unsafe to do? If so, is there an alternative to achieve this or is it not possible at all?

Answer 1

Yep, that's completely safe. It would be unsafe to have multiple instances of Cache that share a directory, whether in one process or multiple.