public class EtagCacheRequestHandler extends BaseDataRequestHandler
If a query is cached, the etag of the query is retrieved from the cache and is injected into query request header
Etag-based cache mechanism relies entirely on Druid's etags to determine a cache hit or miss.
Modifier and Type | Field and Description |
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protected TupleDataCache<String,String,String> |
dataCache |
protected DataRequestHandler |
next |
mapper, writer
Constructor and Description |
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EtagCacheRequestHandler(DataRequestHandler next,
TupleDataCache<String,String,String> dataCache,
com.fasterxml.jackson.databind.ObjectMapper mapper)
Build a Cache request handler.
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Modifier and Type | Method and Description |
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boolean |
handleRequest(RequestContext context,
DataApiRequest request,
DruidAggregationQuery<?> druidQuery,
ResponseProcessor response)
Handle the response, passing the request down the chain as necessary.
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protected final DataRequestHandler next
protected final TupleDataCache<String,String,String> dataCache
public EtagCacheRequestHandler(@NotNull DataRequestHandler next, @NotNull TupleDataCache<String,String,String> dataCache, @NotNull com.fasterxml.jackson.databind.ObjectMapper mapper)
next
- The next handler in the chaindataCache
- The cache instancemapper
- The mapper for all JSON processingpublic boolean handleRequest(RequestContext context, DataApiRequest request, DruidAggregationQuery<?> druidQuery, ResponseProcessor response)
DataRequestHandler
context
- The context for the Requestrequest
- The Api Request ObjectdruidQuery
- The druid queryresponse
- The Async responseCopyright © 2016–2018 Yahoo! Inc.. All rights reserved.