Examples with Key com.apple.foundationdb.record.metadata.Key used on opensource projects

Example 1 with Key

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

the class StandardIndexMaintainer method evaluateIndex.

/**
 * Apply the key and value expressions to a <code>record</code>.
 * @param <M> the message type of the record
 * @param record the record from which the index will extract its key and value
 * @return a list of index keys and values
 */
@Override
public <M extends Message> List<IndexEntry> evaluateIndex(@Nonnull FDBRecord<M> record) {
    final KeyExpression rootExpression = state.index.getRootExpression();
    final List<Key.Evaluated> indexKeys = rootExpression.evaluate(record);
    // so we have to tease them apart.
    if (rootExpression instanceof KeyWithValueExpression) {
        final KeyWithValueExpression keyWithValueExpression = (KeyWithValueExpression) rootExpression;
        return indexKeys.stream().map(key -> new IndexEntry(state.index, keyWithValueExpression.getKey(key), keyWithValueExpression.getValue(key))).collect(Collectors.toList());
    }
    return indexKeys.stream().map(key -> new IndexEntry(state.index, key)).collect(Collectors.toList());
}

Example 2 with Key

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

the class RankIndexMaintainer method updateIndexKeys.

@Override
protected <M extends Message> CompletableFuture<Void> updateIndexKeys(@Nonnull final FDBIndexableRecord<M> savedRecord, final boolean remove, @Nonnull final List<IndexEntry> indexEntries) {
    final int groupPrefixSize = getGroupingCount();
    final Subspace extraSubspace = getSecondarySubspace();
    final List<CompletableFuture<Void>> ordinaryIndexFutures = new ArrayList<>(indexEntries.size());
    final Map<Subspace, CompletableFuture<Void>> rankFutures = Maps.newHashMapWithExpectedSize(indexEntries.size());
    for (IndexEntry indexEntry : indexEntries) {
        // Maintain an ordinary B-tree index by score.
        CompletableFuture<Void> updateOrdinaryIndex = updateOneKeyAsync(savedRecord, remove, indexEntry);
        if (!MoreAsyncUtil.isCompletedNormally(updateOrdinaryIndex)) {
            ordinaryIndexFutures.add(updateOrdinaryIndex);
        }
        final Subspace rankSubspace;
        final Tuple scoreKey;
        if (groupPrefixSize > 0) {
            final List<Object> keyValues = indexEntry.getKey().getItems();
            rankSubspace = extraSubspace.subspace(Tuple.fromList(keyValues.subList(0, groupPrefixSize)));
            scoreKey = Tuple.fromList(keyValues.subList(groupPrefixSize, keyValues.size()));
        } else {
            rankSubspace = extraSubspace;
            scoreKey = indexEntry.getKey();
        }
        // It is unsafe to have two concurrent updates to the same ranked set, so ensure that at most
        // one update per grouping key is ongoing at any given time
        final Function<Void, CompletableFuture<Void>> futureSupplier = vignore -> RankedSetIndexHelper.updateRankedSet(state, rankSubspace, config, indexEntry.getKey(), scoreKey, remove);
        CompletableFuture<Void> existingFuture = rankFutures.get(rankSubspace);
        if (existingFuture == null) {
            rankFutures.put(rankSubspace, futureSupplier.apply(null));
        } else {
            rankFutures.put(rankSubspace, existingFuture.thenCompose(futureSupplier));
        }
    }
    return CompletableFuture.allOf(AsyncUtil.whenAll(ordinaryIndexFutures), AsyncUtil.whenAll(rankFutures.values()));
}

Example 3 with Key

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

the class Main method main.

public static void main(String[] args) {
    // Get a database connection.
    FDBDatabase fdb = FDBDatabaseFactory.instance().getDatabase();
    // Create a subspace using the key space API to create a subspace within
    // the cluster used by this record store. The key space API in general
    // allows the user to specify a hierarchical structure of named sub-paths.
    // Each record store can then fill in the named entries within the path
    // with values relevant to that store. If the key space includes a directory
    // layer directory, then the value supplied by the user will be replaced
    // by a short prefix supplied by the the directory layer. The results from
    // the directory layer are cached locally by the Record Layer to avoid excessive
    // database reads.
    // 
    // In this case, the key space implies that there are multiple "applications"
    // that might be defined to run on the same FoundationDB cluster, and then
    // each "application" might have multiple "environments". This could be used,
    // for example, to connect to either the "prod" or "qa" environment for the same
    // application from within the same code base.
    final KeySpace keySpace = new KeySpace(new DirectoryLayerDirectory("application").addSubdirectory(new KeySpaceDirectory("environment", KeySpaceDirectory.KeyType.STRING)));
    // Create a path for the "record-layer-sample" application's demo environment.
    // Clear all existing data and then return the subspace associated with the key space path.
    final KeySpacePath path = keySpace.path("application", "record-layer-sample").add("environment", "demo");
    // Clear out any data that may be in the record store.
    LOGGER.info("Clearing the Record Store ...");
    fdb.run(context -> {
        path.deleteAllData(context);
        return null;
    });
    // Build the metadata. This simple approach only works for primary
    // keys and secondary indexes defined in the Protobuf message types.
    RecordMetaData rmd = RecordMetaData.build(SampleProto.getDescriptor());
    FDBRecordStore.Builder recordStoreBuilder = FDBRecordStore.newBuilder().setMetaDataProvider(rmd).setKeySpacePath(path);
    // Write records for Vendor and Item.
    LOGGER.info("Writing Vendor and Item record ...");
    fdb.run((FDBRecordContext cx) -> {
        FDBRecordStore store = recordStoreBuilder.copyBuilder().setContext(cx).create();
        store.saveRecord(SampleProto.Vendor.newBuilder().setVendorId(9375L).setVendorName("Acme").build());
        store.saveRecord(SampleProto.Vendor.newBuilder().setVendorId(1066L).setVendorName("Buy n Large").build());
        store.saveRecord(SampleProto.Item.newBuilder().setItemId(4836L).setItemName("GPS").setVendorId(9375L).build());
        store.saveRecord(SampleProto.Item.newBuilder().setItemId(9970L).setItemName("Personal Transport").setVendorId(1066L).build());
        store.saveRecord(SampleProto.Item.newBuilder().setItemId(8380L).setItemName("Piles of Garbage").setVendorId(1066L).build());
        return null;
    });
    // Use the primary key declared in the Vendor message type to read a
    // record.
    LOGGER.info("Reading Vendor record with primary key 9375L ...");
    SampleProto.Vendor.Builder readBuilder = fdb.run((FDBRecordContext cx) -> {
        FDBRecordStore store = recordStoreBuilder.copyBuilder().setContext(cx).open();
        return SampleProto.Vendor.newBuilder().mergeFrom(store.loadRecord(Key.Evaluated.scalar(9375L).toTuple()).getRecord());
    });
    LOGGER.info("    Result -> Id: {}, Name: {}", readBuilder.getVendorId(), readBuilder.getVendorName());
    // Using the secondary index declared in the message type, query
    // Item by vendor ID, then look up the item ID.
    LOGGER.info("Looking for item IDs with vendor ID 9375L ...");
    ArrayList<Long> ids = fdb.run((FDBRecordContext cx) -> {
        ArrayList<Long> itemIDs = new ArrayList<>();
        FDBRecordStore store = recordStoreBuilder.copyBuilder().setContext(cx).open();
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Item").setFilter(Query.field("vendor_id").equalsValue(9375L)).build();
        try (RecordCursor<FDBQueriedRecord<Message>> cursor = store.executeQuery(query)) {
            RecordCursorResult<FDBQueriedRecord<Message>> result;
            do {
                result = cursor.getNext();
                if (result.hasNext()) {
                    itemIDs.add(SampleProto.Item.newBuilder().mergeFrom(result.get().getRecord()).getItemId());
                }
            } while (result.hasNext());
        }
        return itemIDs;
    });
    ids.forEach((Long res) -> LOGGER.info("    Result -> Vendor ID: 9375, Item ID: {}", res));
    // A kind of hand-crafted "cross-table join" (in some sense). This returns a list
    // linking the name of each vendor to the names of the products they sell.
    // Note that this query is entirely non-blocking until the end.
    // In SQL, this might look something like:
    // 
    // SELECT Vendor.name, Item.name FROM Item JOIN Vendor ON Vendor.vendor_id = Item.vid
    // 
    // One difference is that the above SQL query will flatten the results out so that there
    // is exactly one returned row per item name (per vendor) where as the map returned by
    // this RecordLayer query will feature exactly one entry per vendor where the key is the
    // vendor name and the value is the vendor's items.
    // 
    // Note that this query is not particularly efficient as is. To make this efficient, one
    // might consider an index on vendor name. This could scan the index to get the vendor
    // name of the Vendor record type and a second index on item by vendor ID, perhaps with
    // the item name in the value portion of the index definition. This would allow the
    // query to be satisfied with one scan of the vendor name index and another scan of the
    // item's vendor ID index (one scan per vendor).
    LOGGER.info("Grouping items by vendor ...");
    Map<String, List<String>> namesToItems = fdb.run((FDBRecordContext cx) -> cx.asyncToSync(FDBStoreTimer.Waits.WAIT_EXECUTE_QUERY, recordStoreBuilder.copyBuilder().setContext(cx).openAsync().thenCompose(store -> {
        // Outer plan gets all of the vendors
        RecordQueryPlan outerPlan = store.planQuery(RecordQuery.newBuilder().setRecordType("Vendor").setRequiredResults(Arrays.asList(field("vendor_id"), field("vendor_name"))).build());
        // Inner plan gets all items for the given vendor ID.
        // Using "equalsParameter" does the plan once and re-uses the plan for each vendor ID.
        RecordQueryPlan innerPlan = store.planQuery(RecordQuery.newBuilder().setRecordType("Item").setRequiredResults(Collections.singletonList(field("item_name"))).setFilter(Query.field("vendor_id").equalsParameter("vid")).build());
        return store.executeQuery(outerPlan).mapPipelined(record -> {
            SampleProto.Vendor vendor = SampleProto.Vendor.newBuilder().mergeFrom(record.getRecord()).build();
            return innerPlan.execute(store, EvaluationContext.forBinding("vid", vendor.getVendorId())).map(innerRecord -> SampleProto.Item.newBuilder().mergeFrom(innerRecord.getRecord()).getItemName()).asList().thenApply(list -> Pair.of(vendor.getVendorName(), list));
        }, 10).asList().thenApply((List<Pair<String, List<String>>> list) -> list.stream().collect(Collectors.toMap(Pair::getKey, Pair::getValue)));
    })));
    namesToItems.forEach((String name, List<String> items) -> LOGGER.info("    Result -> Vendor Name: {}, Item names: {}", name, items));
    // Richer indexes:
    // To build richer primary keys or secondary indexes (than those definable in the protobuf
    // message types), you need to use the more verbose and powerful RecordMetaDataBuilder.
    RecordMetaDataBuilder rmdBuilder = RecordMetaData.newBuilder().setRecords(SampleProto.getDescriptor());
    // Order customers by last name, then first name, then their ID if otherwise equal.
    // NOTE: This operation is dangerous if you have existing data! Existing records are *not*
    // automatically migrated.
    rmdBuilder.getRecordType("Customer").setPrimaryKey(concatenateFields("last_name", "first_name", "customer_id"));
    // Add a global count index. Most record stores should probably add this index as it allows
    // the database to make intelligent decisions based on the current size of the record store.
    rmdBuilder.addUniversalIndex(new Index("globalCount", new GroupingKeyExpression(EmptyKeyExpression.EMPTY, 0), IndexTypes.COUNT));
    // Add a FanType.FanOut secondary index for email_address, so that
    // each value for email_address generates its own key in the index.
    rmdBuilder.addIndex("Customer", new Index("email_address", field("email_address", FanType.FanOut), IndexTypes.VALUE));
    // Add a FanType.Concatenate secondary index for preference_tag, so
    // that all values for preference_tag generate a single key in the index.
    rmdBuilder.addIndex("Customer", new Index("preference_tag", field("preference_tag", FanType.Concatenate), IndexTypes.VALUE));
    // Add an index on the count of each preference tag. This allows us to
    // quickly get the number of users for each preference tag. The key
    // provided will create a separate "count" field for each value of the
    // preference_tag field and keep track of the number of customer
    // records with each value.
    rmdBuilder.addIndex("Customer", new Index("preference_tag_count", new GroupingKeyExpression(field("preference_tag", FanType.FanOut), 0), IndexTypes.COUNT));
    // Add a nested secondary index for order such that each value for
    // quantity in Order generates a single key in the index.
    rmdBuilder.addIndex("Customer", new Index("order", field("order", FanType.FanOut).nest("quantity"), IndexTypes.VALUE));
    // Add an index on the sum of the quantity of each item in each
    // order. This can be used to know how many of each item have been ordered across
    // all customers. The grouping key here is a little hairy, but it
    // specifies that the "item_id" column should be used as a grouping key
    // and the quantity used as the sum value, so it will keep track of the
    // quantity ordered of each item.
    rmdBuilder.addIndex("Customer", new Index("item_quantity_sum", new GroupingKeyExpression(field("order", FanType.FanOut).nest(concatenateFields("item_id", "quantity")), 1), IndexTypes.SUM));
    // Rebuild the metadata for the newly added indexes before reading or
    // writing more data.
    RecordMetaData rmd2 = rmdBuilder.getRecordMetaData();
    recordStoreBuilder.setMetaDataProvider(rmd2);
    // Calling "open" on an existing record store with new meta-data will
    // create the index and place them in a "disabled" mode that means that
    // they cannot yet be used for queries. (In particular, the query planner
    // will ignore this index and any attempt to read from the index will
    // throw an error.) To enable querying, one must invoke the online index
    // builder. This will scan through the record store across multiple
    // transactions and populate the new indexes with data from the existing
    // entries. During the build job, the record store remains available for
    // reading and writing, but there may be additional conflicts if the index
    // build job and normal operations happen to mutate the same records.
    RecordStoreState storeState = fdb.run(cx -> {
        FDBRecordStore store = recordStoreBuilder.copyBuilder().setContext(cx).open();
        return store.getRecordStoreState();
    });
    LOGGER.info("Running index builds of new indexes:");
    // Build all of the indexes in parallel by firing off a future for each and
    // then wait for all of them.
    fdb.asyncToSync(null, FDBStoreTimer.Waits.WAIT_ONLINE_BUILD_INDEX, AsyncUtil.whenAll(storeState.getDisabledIndexNames().stream().map(indexName -> {
        // Build this index. It will begin the background job and return a future
        // that will complete when the index is ready for querying.
        OnlineIndexer indexBuilder = OnlineIndexer.newBuilder().setDatabase(fdb).setRecordStoreBuilder(recordStoreBuilder).setIndex(indexName).build();
        return indexBuilder.buildIndexAsync().thenRun(() -> LOGGER.info("  Index build of {} is complete.", indexName)).whenComplete((vignore, eignore) -> indexBuilder.close());
    }).collect(Collectors.toList())));
    // Write larger records for Customer (and Order).
    LOGGER.info("Adding records with new secondary indexes ...");
    fdb.run((FDBRecordContext cx) -> {
        FDBRecordStore store = recordStoreBuilder.copyBuilder().setContext(cx).open();
        store.saveRecord(SampleProto.Customer.newBuilder().setCustomerId(9264L).setFirstName("John").setLastName("Smith").addEmailAddress("jsmith@example.com").addEmailAddress("john_smith@example.com").addPreferenceTag("books").addPreferenceTag("movies").addOrder(SampleProto.Order.newBuilder().setOrderId(3875L).setItemId(9374L).setQuantity(2)).addOrder(SampleProto.Order.newBuilder().setOrderId(4828L).setItemId(2740L).setQuantity(1)).setPhoneNumber("(703) 555-8255").build());
        store.saveRecord(SampleProto.Customer.newBuilder().setCustomerId(8365L).setFirstName("Jane").setLastName("Doe").addEmailAddress("jdoe@example.com").addEmailAddress("jane_doe@example.com").addPreferenceTag("games").addPreferenceTag("lawn").addPreferenceTag("books").addOrder(SampleProto.Order.newBuilder().setOrderId(9280L).setItemId(2740L).setQuantity(3)).setPhoneNumber("(408) 555-0248").build());
        return null;
    });
    // Get the record count. This uses the global count index to get the
    // full number of records in the store.
    Long recordCount = fdb.run((FDBRecordContext cx) -> cx.asyncToSync(FDBStoreTimer.Waits.WAIT_EXECUTE_QUERY, recordStoreBuilder.copyBuilder().setContext(cx).openAsync().thenCompose(FDBRecordStore::getSnapshotRecordCount)));
    LOGGER.info("Store contains {} records.", recordCount);
    // Query all records with the first name "Jane".
    // Performs a full scan of the primary key index.
    LOGGER.info("Retrieving all customers with first name \"Jane\"...");
    List<String> names = fdb.run((FDBRecordContext cx) -> {
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Customer").setFilter(Query.field("first_name").equalsValue("Jane")).build();
        return readNames(recordStoreBuilder, cx, query);
    });
    names.forEach((String res) -> LOGGER.info("    Result -> {}", res));
    // Query all records with last name "Doe".
    // Scans only the customers from the primary key index.
    LOGGER.info("Retrieving all customers with last name \"Doe\"...");
    names = fdb.run((FDBRecordContext cx) -> {
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Customer").setFilter(Query.field("last_name").equalsValue("Doe")).build();
        return readNames(recordStoreBuilder, cx, query);
    });
    names.forEach((String res) -> LOGGER.info("    Result -> {}", res));
    // Query all records with first_name "Jane" and last_name "Doe"
    // Scans only the customers from the primary key index.
    LOGGER.info("Retrieving all customers with name \"Jane Doe\"...");
    names = fdb.run((FDBRecordContext cx) -> {
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Customer").setFilter(Query.and(Query.field("first_name").equalsValue("Jane"), Query.field("last_name").equalsValue("Doe"))).build();
        return readNames(recordStoreBuilder, cx, query);
    });
    names.forEach((String res) -> LOGGER.info("    Result -> {}", res));
    // Query all records with an email address beginning with "john".
    // Uses FanType.FanOut secondary index.
    LOGGER.info("Retrieving all customers with an email address beginning with \"john\"...");
    Map<String, List<String>> addresses = fdb.run((FDBRecordContext cx) -> {
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Customer").setFilter(Query.field("email_address").oneOfThem().startsWith("john")).build();
        return cx.asyncToSync(FDBStoreTimer.Waits.WAIT_EXECUTE_QUERY, recordStoreBuilder.copyBuilder().setContext(cx).openAsync().thenCompose(store -> {
            Map<String, List<String>> addressMap = new HashMap<>();
            return store.executeQuery(query).forEach((FDBQueriedRecord<Message> record) -> {
                SampleProto.Customer.Builder builder = SampleProto.Customer.newBuilder().mergeFrom(record.getRecord());
                addressMap.put(builder.getFirstName() + " " + builder.getLastName(), builder.getEmailAddressList());
            }).thenApply(v -> addressMap);
        }));
    });
    addresses.forEach((String k, List<String> vals) -> LOGGER.info("    Result -> {} with emails {}", k, vals));
    // Query all records with preference_tags "books" and "movies".
    // Uses FanType.Concatenate secondary index.
    LOGGER.info("Retrieving all customers with preference tags \"books\" and \"movies\"...");
    names = fdb.run((FDBRecordContext cx) -> {
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Customer").setFilter(Query.and(Query.field("preference_tag").oneOfThem().equalsValue("books"), Query.field("preference_tag").oneOfThem().equalsValue("movies"))).build();
        return readNames(recordStoreBuilder, cx, query);
    });
    names.forEach((String res) -> LOGGER.info("    Result -> {}", res));
    // Get the number of customers who have "books" listed as one of their preference tags
    Long bookPreferenceCount = fdb.run((FDBRecordContext cx) -> cx.asyncToSync(FDBStoreTimer.Waits.WAIT_EXECUTE_QUERY, recordStoreBuilder.copyBuilder().setContext(cx).openAsync().thenCompose(store -> {
        Index index = store.getRecordMetaData().getIndex("preference_tag_count");
        IndexAggregateFunction function = new IndexAggregateFunction(FunctionNames.COUNT, index.getRootExpression(), index.getName());
        return store.evaluateAggregateFunction(Collections.singletonList("Customer"), function, Key.Evaluated.scalar("books"), IsolationLevel.SERIALIZABLE).thenApply(tuple -> tuple.getLong(0));
    })));
    LOGGER.info("Number of customers with the \"books\" preference tag: {}", bookPreferenceCount);
    // Query all customers with an order of quantity greater than 2.
    // Uses nested secondary index.
    LOGGER.info("Retrieving all customers with an order of quantity greater than 2 ...");
    names = fdb.run((FDBRecordContext cx) -> {
        RecordQuery query = RecordQuery.newBuilder().setRecordType("Customer").setFilter(Query.field("order").oneOfThem().matches(Query.field("quantity").greaterThan(2))).build();
        return readNames(recordStoreBuilder, cx, query);
    });
    names.forEach((String res) -> LOGGER.info("    Result -> {}", res));
    // Get the sum of the quantity of items ordered for item ID 2740.
    // Using the index, it can determine this by reading a single
    // key in the database.
    Long itemQuantitySum = fdb.run((FDBRecordContext cx) -> cx.asyncToSync(FDBStoreTimer.Waits.WAIT_EXECUTE_QUERY, recordStoreBuilder.copyBuilder().setContext(cx).openAsync().thenCompose(store -> {
        Index index = store.getRecordMetaData().getIndex("item_quantity_sum");
        IndexAggregateFunction function = new IndexAggregateFunction(FunctionNames.SUM, index.getRootExpression(), index.getName());
        return store.evaluateAggregateFunction(Collections.singletonList("Customer"), function, Key.Evaluated.scalar(2740L), IsolationLevel.SERIALIZABLE).thenApply(tuple -> tuple.getLong(0));
    })));
    LOGGER.info("Total quantity ordered of item 2740L: {}", itemQuantitySum);
    // Get the sum of the quantity of all items ordered.
    // Using the index, it will do a scan that will hit one key
    // for each unique item id with a single range scan.
    Long allItemsQuantitySum = fdb.run((FDBRecordContext cx) -> cx.asyncToSync(FDBStoreTimer.Waits.WAIT_EXECUTE_QUERY, recordStoreBuilder.copyBuilder().setContext(cx).openAsync().thenCompose(store -> {
        Index index = store.getRecordMetaData().getIndex("item_quantity_sum");
        IndexAggregateFunction function = new IndexAggregateFunction(FunctionNames.SUM, index.getRootExpression(), index.getName());
        return store.evaluateAggregateFunction(Collections.singletonList("Customer"), function, TupleRange.ALL, IsolationLevel.SERIALIZABLE).thenApply(tuple -> tuple.getLong(0));
    })));
    LOGGER.info("Total quantity ordered of all items: {}", allItemsQuantitySum);
}

Example 4 with Key

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

the class FDBRecordStore method getPrimaryKeyBoundaries.

/**
 * Return a cursor of boundaries separating the key ranges maintained by each FDB server. This information can be
 * useful for splitting a large task (e.g., rebuilding an index for a large record store) into smaller tasks (e.g.,
 * rebuilding the index for records in certain primary key ranges) more evenly so that they can be executed in a
 * parallel fashion efficiently. The returned boundaries are an estimate from FDB's locality API and may not
 * represent the exact boundary locations at any database version.
 * <p>
 * The boundaries are returned as a cursor which is sorted and does not contain any duplicates. The first element of
 * the list is greater than or equal to <code>low</code>, and the last element is less than or equal to
 * <code>high</code>.
 * <p>
 * This implementation may not work when there are too many shard boundaries to complete in a single transaction.
 * <p>
 * Note: the returned cursor is blocking and must not be used in an asynchronous context
 *
 * @param low low endpoint of primary key range (inclusive)
 * @param high high endpoint of primary key range (exclusive)
 * @return the list of boundary primary keys
 */
@API(API.Status.EXPERIMENTAL)
@Nonnull
public RecordCursor<Tuple> getPrimaryKeyBoundaries(@Nonnull Tuple low, @Nonnull Tuple high) {
    final Transaction transaction = ensureContextActive();
    byte[] rangeStart = recordsSubspace().pack(low);
    byte[] rangeEnd = recordsSubspace().pack(high);
    CloseableAsyncIterator<byte[]> cursor = context.getDatabase().getLocalityProvider().getBoundaryKeys(transaction, rangeStart, rangeEnd);
    final boolean hasSplitRecordSuffix = hasSplitRecordSuffix();
    DistinctFilterCursorClosure closure = new DistinctFilterCursorClosure();
    return RecordCursor.flatMapPipelined(ignore -> RecordCursor.fromIterator(getExecutor(), cursor), (result, ignore) -> RecordCursor.fromIterator(getExecutor(), transaction.snapshot().getRange(result, rangeEnd, 1).iterator()), null, DEFAULT_PIPELINE_SIZE).map(keyValue -> {
        Tuple recordKey = recordsSubspace().unpack(keyValue.getKey());
        return hasSplitRecordSuffix ? recordKey.popBack() : recordKey;
    }).filter(closure::pred);
}

Example 5 with Key

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

the class FDBRecordStore method getSnapshotRecordCount.

@Override
public CompletableFuture<Long> getSnapshotRecordCount(@Nonnull KeyExpression key, @Nonnull Key.Evaluated value, @Nonnull IndexQueryabilityFilter indexQueryabilityFilter) {
    if (getRecordMetaData().getRecordCountKey() != null) {
        if (key.getColumnSize() != value.size()) {
            throw recordCoreException("key and value are not the same size");
        }
        final ReadTransaction tr = context.readTransaction(true);
        final Tuple subkey = Tuple.from(RECORD_COUNT_KEY).addAll(value.toTupleAppropriateList());
        if (getRecordMetaData().getRecordCountKey().equals(key)) {
            return tr.get(getSubspace().pack(subkey)).thenApply(FDBRecordStore::decodeRecordCount);
        } else if (key.isPrefixKey(getRecordMetaData().getRecordCountKey())) {
            AsyncIterable<KeyValue> kvs = tr.getRange(getSubspace().range(Tuple.from(RECORD_COUNT_KEY)));
            return MoreAsyncUtil.reduce(getExecutor(), kvs.iterator(), 0L, (count, kv) -> count + decodeRecordCount(kv.getValue()));
        }
    }
    return evaluateAggregateFunction(Collections.emptyList(), IndexFunctionHelper.count(key), TupleRange.allOf(value.toTuple()), IsolationLevel.SNAPSHOT, indexQueryabilityFilter).thenApply(tuple -> tuple.getLong(0));
}