On Tue, Oct 27, 2009 at 6:17 PM, kousen <[email protected]> wrote:
>
> I'm using the Java API. In my app, I store (only) the ISBN's of a
> series of books. When I load the books, my service goes to Amazon and
> retrieves the rest of the information about the book from their web
> service. Then I display all the books on a page.
>
> My service uses the JCache API, with a static attribute to represent
> the cache. The (pseudo) code below is roughly analogous to what I
> actually do:
>
> public class AmazonBookService {
> private static Cache cache;
>
> static {
> int secs = // expiration limit
> cache = // get the factory, initialize the cache with expiration
> limit
> }
>
> public Book[] getBooks() {
> // use a DAO to get the ISBNs from the datastore -- happens
> every request
> // initialize results array
> // for each ISBN:
> // if book is in cache, add it to results
> // if not, fetch data from Amazon, build book, and add it to
> cache and the results
> // }
> // return all the books
> }
> }
>
> When I deploy the service, it seems to work, but most of the time when
> I refresh a web page it still take a long time.
>
> My questions are:
>
> 1. Is this the right way to use the cache?
>
Yes. (And yes, the underlying cache is shared across all JVMs. Static
variables are not.)
> 2. How can I check to see if it's working?
>
You can examine your cache hit rate and other details by calling
getCacheStatistics() on your JCache and converting the result to a string.
> 3. Is there a way I can send all the book requests to Amazon
> simultaneously?
>
>
Not yet. Asynchronous API's are definitely planned, and URLFetch is mos
likely the first API that we will support.
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