The javadocs for MemcacheService suggest a pattern that you would use
if the
backing cache used soft references:
foo = memcache.get("key");
if (foo == null) {
if (memcache.contains("key")) {
// continue, assuming foo had the real value null
} else {
// continue; foo may have had a real null, but has been dropped
now
}
}
On Sep 11, 12:33 pm, realdope <[email protected]> wrote:
> Here's rest of the code:
>
> public class Memcache {
> private static int EXPIRY = 60*60*24*30;
> private static final String POSTIDKEY="POSTID_";
>
> private static boolean has(String key) {
> return MemcacheServiceFactory.getMemcacheService().contains(key) &&
> get(key).length()>0;
> }
>
> private static String get(String key) {
> try {
> return (String)
> MemcacheServiceFactory.getMemcacheService().get(key);
> } catch (Exception e) { return ""; }
> }
>
> private static void put(String key, String value, int expiry) {
> MemcacheServiceFactory.getMemcacheService().put(key, value,
> Expiration.byDeltaSeconds(expiry));
> }
>
> private static void delete(String key) {
> MemcacheServiceFactory.getMemcacheService().delete(key);
> }
>
> public static boolean hasById(Long id) { return has(POSTIDKEY+id); }
> public static String getById(Long id) { return get(POSTIDKEY+id); }
> public static void putById(Long id, String value) { put(POSTIDKEY+id,
> value, EXPIRY); }
> public static void flushById(Long id) { delete(POSTIDKEY+id); }
>
> }
>
> public static String byid(HttpServletRequest req) {
> Long id=0L;
> try { id=Long.parseLong(req.getParameter("id")); } catch (Exception
> e) {}
> if (id==0) return "";
> if (Memcache.hasById(id)) return Memcache.getById(id);
> String res = V1Post.getById(id);
> Memcache.putById(id, res);
> return res;
> }
>
> Does anyone know where the error is in my code? And why Memcache.hasById(id)
> seems to always return false?
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