예제 #1
0
 /**
  * Makes a quick request to the aggregation manager to see whether the cell value required by a
  * particular cell request is in external cache.
  *
  * <p>'Quick' is relative. It is an asynchronous request (due to the aggregation manager being an
  * actor) and therefore somewhat slow. If the segment is in cache, will save batching up future
  * requests and re-executing the query. Win should be particularly noticeable for queries running
  * on a populated cache. Without this feature, every query would require at least two iterations.
  *
  * <p>Request does not issue SQL to populate the segment. Nor does it try to find existing
  * segments for rollup. Those operations can wait until next phase.
  *
  * <p>Client is responsible for adding the segment to its private cache.
  *
  * @param request Cell request
  * @return Segment with data, or null if not in cache
  */
 public SegmentWithData peek(final CellRequest request) {
   final SegmentCacheManager.PeekResponse response =
       execute(new PeekCommand(request, Locus.peek()));
   for (SegmentHeader header : response.headerMap.keySet()) {
     final SegmentBody body = compositeCache.get(header);
     if (body != null) {
       final SegmentBuilder.SegmentConverter converter =
           response.converterMap.get(SegmentCacheIndexImpl.makeConverterKey(header));
       if (converter != null) {
         return converter.convert(header, body);
       }
     }
   }
   for (Map.Entry<SegmentHeader, Future<SegmentBody>> entry : response.headerMap.entrySet()) {
     final Future<SegmentBody> bodyFuture = entry.getValue();
     if (bodyFuture != null) {
       final SegmentBody body = Util.safeGet(bodyFuture, "Waiting for segment to load");
       final SegmentHeader header = entry.getKey();
       final SegmentBuilder.SegmentConverter converter =
           response.converterMap.get(SegmentCacheIndexImpl.makeConverterKey(header));
       if (converter != null) {
         return converter.convert(header, body);
       }
     }
   }
   return null;
 }
예제 #2
0
    public PeekResponse call() {
      final RolapStar.Measure measure = request.getMeasure();
      final RolapStar star = measure.getStar();
      final RolapSchema schema = star.getSchema();
      final AggregationKey key = new AggregationKey(request);
      final List<SegmentHeader> headers =
          indexRegistry
              .getIndex(star)
              .locate(
                  schema.getName(),
                  schema.getChecksum(),
                  measure.getCubeName(),
                  measure.getName(),
                  star.getFactTable().getAlias(),
                  request.getConstrainedColumnsBitKey(),
                  request.getMappedCellValues(),
                  AggregationKey.getCompoundPredicateStringList(
                      star, key.getCompoundPredicateList()));

      final Map<SegmentHeader, Future<SegmentBody>> headerMap =
          new HashMap<SegmentHeader, Future<SegmentBody>>();
      final Map<List, SegmentBuilder.SegmentConverter> converterMap =
          new HashMap<List, SegmentBuilder.SegmentConverter>();

      // Is there a pending segment? (A segment that has been created and
      // is loading via SQL.)
      for (final SegmentHeader header : headers) {
        final Future<SegmentBody> bodyFuture = indexRegistry.getIndex(star).getFuture(header);
        if (bodyFuture != null) {
          // Check if the DataSourceChangeListener wants us to clear
          // the current segment
          if (star.getChangeListener() != null
              && star.getChangeListener().isAggregationChanged(key)) {
            /*
             * We can't satisfy this request, and we must clear the
             * data from our cache. We clear it from the index
             * first, then queue up a job in the background
             * to remove the data from all the caches.
             */
            indexRegistry.getIndex(star).remove(header);
            Util.safeGet(
                cacheExecutor.submit(
                    new Runnable() {
                      public void run() {
                        try {
                          compositeCache.remove(header);
                        } catch (Throwable e) {
                          LOGGER.warn("remove header failed: " + header, e);
                        }
                      }
                    }),
                "SegmentCacheManager.peek");
          }
          converterMap.put(
              SegmentCacheIndexImpl.makeConverterKey(header), getConverter(star, header));
          headerMap.put(header, bodyFuture);
        }
      }

      return new PeekResponse(headerMap, converterMap);
    }