コード例 #1
0
ファイル: query_stage_keep.cpp プロジェクト: lebronhkh/mongo
    void run() {
        OldClientWriteContext ctx(&_txn, ns());
        Database* db = ctx.db();
        Collection* coll = db->getCollection(ns());
        if (!coll) {
            WriteUnitOfWork wuow(&_txn);
            coll = db->createCollection(&_txn, ns());
            wuow.commit();
        }

        WorkingSet ws;

        // Add 10 objects to the collection.
        for (size_t i = 0; i < 10; ++i) {
            insert(BSON("x" << 1));
        }

        // Create 10 objects that are flagged.
        for (size_t i = 0; i < 10; ++i) {
            WorkingSetID id = ws.allocate();
            WorkingSetMember* member = ws.get(id);
            member->state = WorkingSetMember::OWNED_OBJ;
            member->obj = Snapshotted<BSONObj>(SnapshotId(), BSON("x" << 2));
            ws.flagForReview(id);
        }

        // Create a collscan to provide the 10 objects in the collection.
        CollectionScanParams params;
        params.collection = coll;
        params.direction = CollectionScanParams::FORWARD;
        params.tailable = false;
        params.start = RecordId();
        CollectionScan* cs = new CollectionScan(&_txn, params, &ws, NULL);

        // Create a KeepMutations stage to merge in the 10 flagged objects.
        // Takes ownership of 'cs'
        MatchExpression* nullFilter = NULL;
        std::unique_ptr<KeepMutationsStage> keep(new KeepMutationsStage(nullFilter, &ws, cs));

        for (size_t i = 0; i < 10; ++i) {
            WorkingSetID id = getNextResult(keep.get());
            WorkingSetMember* member = ws.get(id);
            ASSERT_FALSE(ws.isFlagged(id));
            ASSERT_EQUALS(member->obj.value()["x"].numberInt(), 1);
        }

        {
            WorkingSetID out;
            ASSERT_EQ(cs->work(&out), PlanStage::IS_EOF);
        }

        // Flagged results *must* be at the end.
        for (size_t i = 0; i < 10; ++i) {
            WorkingSetID id = getNextResult(keep.get());
            WorkingSetMember* member = ws.get(id);
            ASSERT(ws.isFlagged(id));
            ASSERT_EQUALS(member->obj.value()["x"].numberInt(), 2);
        }
    }
コード例 #2
0
ファイル: query_stage_keep.cpp プロジェクト: PedroLai/mongo
        void run() {
            OperationContextImpl txn;
            Client::WriteContext ctx(&txn, ns());

            Database* db = ctx.ctx().db();
            Collection* coll = db->getCollection(&txn, ns());
            if (!coll) {
                coll = db->createCollection(&txn, ns());
            }
            WorkingSet ws;

            // Add 10 objects to the collection.
            for (size_t i = 0; i < 10; ++i) {
                insert(BSON("x" << 1));
            }

            // Create 10 objects that are flagged.
            for (size_t i = 0; i < 10; ++i) {
                WorkingSetID id = ws.allocate();
                WorkingSetMember* member = ws.get(id);
                member->state = WorkingSetMember::OWNED_OBJ;
                member->obj = BSON("x" << 2);
                ws.flagForReview(id);
            }

            // Create a collscan to provide the 10 objects in the collection.
            CollectionScanParams params;
            params.collection = coll;
            params.direction = CollectionScanParams::FORWARD;
            params.tailable = false;
            params.start = DiskLoc();
            CollectionScan* cs = new CollectionScan(params, &ws, NULL);

            // Create a KeepMutations stage to merge in the 10 flagged objects.
            // Takes ownership of 'cs'
            KeepMutationsStage* keep = new KeepMutationsStage(NULL, &ws, cs);

            for (size_t i = 0; i < 10; ++i) {
                WorkingSetID id = getNextResult(keep);
                WorkingSetMember* member = ws.get(id);
                ASSERT_FALSE(ws.isFlagged(id));
                ASSERT_EQUALS(member->obj["x"].numberInt(), 1);
            }

            ASSERT(cs->isEOF());

            // Flagged results *must* be at the end.
            for (size_t i = 0; i < 10; ++i) {
                WorkingSetID id = getNextResult(keep);
                WorkingSetMember* member = ws.get(id);
                ASSERT(ws.isFlagged(id));
                ASSERT_EQUALS(member->obj["x"].numberInt(), 2);
            }
        }