Examples with RecordCursor com.apple.foundationdb.record.RecordCursor used on opensource projects

Example 66 with RecordCursor

use of com.apple.foundationdb.record.RecordCursor in project fdb-record-layer by FoundationDB.

the class RecordQuerySortPlan method executePlan.

@Nonnull
@Override
public <M extends Message> RecordCursor<QueryResult> executePlan(@Nonnull FDBRecordStoreBase<M> store, @Nonnull EvaluationContext context, @Nullable byte[] continuation, @Nonnull ExecuteProperties executeProperties) {
    // Since we are sorting, we need to feed through everything from the inner plan,
    // even just to get the top few.
    final ExecuteProperties executeInner = executeProperties.clearSkipAndLimit();
    final Function<byte[], RecordCursor<FDBQueriedRecord<M>>> innerCursor = innerContinuation -> getChild().executePlan(store, context, innerContinuation, executeInner).map(result -> result.<M>getQueriedRecord(0));
    final int skip = executeProperties.getSkip();
    final int limit = executeProperties.getReturnedRowLimitOrMax();
    final int maxRecordsToRead = limit == Integer.MAX_VALUE ? limit : skip + limit;
    final RecordQuerySortAdapter<M> adapter = key.getAdapter(store, maxRecordsToRead);
    final FDBStoreTimer timer = store.getTimer();
    final RecordCursor<FDBQueriedRecord<M>> sorted;
    if (adapter.isMemoryOnly()) {
        sorted = MemorySortCursor.create(adapter, innerCursor, timer, continuation).skipThenLimit(skip, limit);
    } else {
        sorted = FileSortCursor.create(adapter, innerCursor, timer, continuation, skip, limit);
    }
    return sorted.map(QueryResult::of);
}