LakshSingla commented on code in PR #16620:
URL: https://github.com/apache/druid/pull/16620#discussion_r1668005487
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processing/src/main/java/org/apache/druid/query/QueryToolChest.java:
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@@ -251,19 +251,36 @@
*/
public abstract TypeReference<ResultType> getResultTypeReference();
+ /**
+ * Like {@link #getCacheStrategy(Query, ObjectMapper)} but the caller
doesn't supply the object mapper for deserializing
+ * and converting the cached data to desired type. It's upto the individual
implementations to decide the appropriate action in that case.
+ * It can either throw an exception outright or decide if the query requires
the object mapper for proper downstream processing and
+ * work with the generic java types if not.
+ * <p>
+ * @deprecated Use {@link #getCacheStrategy(Query, ObjectMapper)} instead
+ */
+ @Deprecated
+ @Nullable
+ public <T> CacheStrategy<ResultType, T, QueryType>
getCacheStrategy(QueryType query)
+ {
+ return null;
+ }
+
/**
* Returns a CacheStrategy to be used to load data into the cache and remove
it from the cache.
* <p>
* This is optional. If it returns null, caching is effectively disabled
for the query.
*
* @param query The query whose results might be cached
+ * @param mapper Object mapper to convert the deserialized generic java
objects to desired types. It can be nullable
+ * to preserve backward compatibility.
* @param <T> The type of object that will be stored in the cache
* @return A CacheStrategy that can be used to populate and read from the
Cache
*/
@Nullable
- public <T> CacheStrategy<ResultType, T, QueryType>
getCacheStrategy(QueryType query)
+ public <T> CacheStrategy<ResultType, T, QueryType>
getCacheStrategy(QueryType query, @Nullable ObjectMapper mapper)
{
- return null;
+ return getCacheStrategy(query);
Review Comment:
Not relevant, the deprecated method is used to maintain backward
compatibility.
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