Examples with MongodTransaction com.torodb.mongodb.core.MongodTransaction used on opensource projects

Example 1 with MongodTransaction

use of com.torodb.mongodb.core.MongodTransaction in project torodb by torodb.

the class FindImplementation method apply.

@Override
public Status<FindResult> apply(Request req, Command<? super FindArgument, ? super FindResult> command, FindArgument arg, MongodTransaction context) {
    logFindCommand(arg);
    BsonDocument filter = arg.getFilter();
    Cursor<BsonDocument> cursor;
    switch(filter.size()) {
        case 0:
            {
                cursor = context.getTorodTransaction().findAll(req.getDatabase(), arg.getCollection()).asDocCursor().transform(t -> t.getRoot()).transform(ToBsonDocumentTranslator.getInstance());
                break;
            }
        case 1:
            {
                try {
                    cursor = getByAttributeCursor(context.getTorodTransaction(), req.getDatabase(), arg.getCollection(), filter).transform(ToBsonDocumentTranslator.getInstance());
                } catch (CommandFailed ex) {
                    return Status.from(ex);
                }
                break;
            }
        default:
            {
                return Status.from(ErrorCode.COMMAND_FAILED, "The given query is not supported right now");
            }
    }
    if (Long.valueOf(arg.getBatchSize()) > (long) Integer.MAX_VALUE) {
        return Status.from(ErrorCode.COMMAND_FAILED, "Only batchSize equals or lower than " + Integer.MAX_VALUE + " is supported");
    }
    OptionalLong batchSize = arg.getEffectiveBatchSize();
    List<BsonDocument> batch = cursor.getNextBatch(batchSize.isPresent() ? (int) batchSize.getAsLong() : 101);
    cursor.close();
    return Status.ok(new FindResult(CursorResult.createSingleBatchCursor(req.getDatabase(), arg.getCollection(), batch.iterator())));
}