Declarative Cache Control API

I’ve been sitting on this for a while as a future feature but hadn’t documented it.

The API would allow specifying a cache interaction policy both “downward” on the load and “upward” back through the processing. Through this you can facilitate complex cache interactions for both valid and seemingly-questionable use cases.

Random subset of interactions from other issues:

• Skip memory cache “downward” only.
• Skip memory cache “upward” only.
• Load from local cache (memory or disk) only.
• Force re-load from network.

I’m not going to do a full-on API strawman, but I know we’ll probably want some EnumSet action with

public enum BitmapSource { MEMORY, DISK, NETWORK }
public enum BitmapSink { MEMORY, DISK }

This API will trump the existing weak skipCache() method on RequestCreator.

[JakeWharton]

One is reading, the other is writing, respectively.

On Thu, Dec 11, 2014, 6:52 PM rothschild86 [e-mail] wrote:

Awesome to see progress on this. What’s the difference between NO_CACHE and NO_STORE?

— Reply to this email directly or view it on GitHub https://github.com/square/picasso/issues/438#issuecomment-66725587.

[parthanjaria]

I am also facing similar problem. I am using 2.5.2 version.

I have an image(profile_picture) at a url. Now i want that to be cached. But when I re-upload/change the image on the server with same link, i want picasso to update that image.

I tried using invalidate(url), memoryPolicy(NO_CACHE), networkPolicy(NO_CACHE) but nothing seems to work. need urgent solution