Volley: How to set up a Cache.Entry

Question

I am using Google's Volley Library as my design for getting network data;

I have set up a RequestQueue

requestQueue = new RequestQueue(new DiskBasedCache(new File(context.getCacheDir(), 
           DEFAULT_CACHE_DIR)), new BasicNetwork(new 
              HttpClientStack(AndroidHttpClient.newInstance(userAgent))));

I have also subclassed Request, and have data coming back from the network just fine. My issue is with caching: in parseNetworkResponse() which is overridden in my subclass of Request, when I call

return Response.success(list, HttpHeaderParser.parseCacheHeaders(response));

HttpHeaderParser.parseCacheHeaders(response) returns null since the server is set up for "no caching" in its response header... Regardless I still would like to cache this data for a variable set number of hours (24 hours probably), How can I do this by creating a volley Cache.Entry... It is my understanding that the URL is used as the cache key value (and I would like it to be the URL).

To sum up, since HttpHeaderParser.parseCacheHeaders(response) returns null, I would like to create a new Cache.Entry that is set up for expiring after 24 hours, and the cache key being the URL of the request.

Any thoughts?

Thanks!

Answer 1

I've had the same issue and ended up with this solution:

@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {

    // Create a FakeCache that invalidate the data after 24 hour
    Cache.Entry mFakeCache = HttpHeaderParser.parseCacheHeaders(response);
    mFakeCache.etag = null;
    mFakeCache.softTtl = System.currentTimeMillis() + 86400 * 1000;
    mFakeCache.ttl = mFakeCache.softTtl;

    return Response.success(response.data, mFakeCache);
}