/** Returns the {@link SegmentCacheIndex} for a given {@link SegmentHeader}. */
private SegmentCacheIndex getIndex(SegmentHeader header) {
// First we check the indexes that already exist.
// This is fast.
for (Entry<RolapStar, SegmentCacheIndex> entry : indexes.entrySet()) {
final String factTableName = entry.getKey().getFactTable().getTableName();
final ByteString schemaChecksum = entry.getKey().getSchema().getChecksum();
if (!factTableName.equals(header.rolapStarFactTableName)) {
continue;
}
if (!schemaChecksum.equals(header.schemaChecksum)) {
continue;
}
return entry.getValue();
}
// The index doesn't exist. Let's create it.
for (RolapSchema schema : RolapSchema.getRolapSchemas()) {
if (!schema.getChecksum().equals(header.schemaChecksum)) {
continue;
}
// We have a schema match.
RolapStar star = schema.getStar(header.rolapStarFactTableName);
if (star != null) {
// Found it.
indexes.put(star, new SegmentCacheIndexImpl(thread));
}
return indexes.get(star);
}
return null;
}
