Examples with Row io.cdap.cdap.api.dataset.table.Row used on opensource projects

Example 16 with Row

use of io.cdap.cdap.api.dataset.table.Row in project cdap by caskdata.

the class MetadataStoreDataset method scan.

/**
 * Run a scan on MDS for default COLUMN
 *
 * @param startId  scan start key
 * @param stopId   scan stop key
 * @param typeOfT  type of value
 * @param function function to process each element returned from scan.
 *                 If function.apply returns false then the scan is stopped.
 *                 Also, function.apply should not return null.
 * @param <T>      type of value
 */
public <T> void scan(MDSKey startId, @Nullable MDSKey stopId, Type typeOfT, Function<KeyValue<T>, Boolean> function) {
    byte[] startKey = startId.getKey();
    byte[] stopKey = stopId == null ? Bytes.stopKeyForPrefix(startKey) : stopId.getKey();
    try (Scanner scan = table.scan(startKey, stopKey)) {
        Row next;
        while ((next = scan.next()) != null) {
            byte[] columnValue = next.get(COLUMN);
            if (columnValue == null) {
                continue;
            }
            MDSKey key = new MDSKey(next.getRow());
            T value = deserialize(key, columnValue, typeOfT);
            // noinspection ConstantConditions
            if (!function.apply(new KeyValue<>(key, value))) {
                break;
            }
        }
    }
}

Example 17 with Row

use of io.cdap.cdap.api.dataset.table.Row in project cdap by caskdata.

the class MetadataStoreDataset method listCombinedFilterKV.

private <T> Map<MDSKey, T> listCombinedFilterKV(Scan runScan, Type typeOfT, int limit, @Nullable Predicate<KeyValue<T>> combinedFilter) {
    try {
        Map<MDSKey, T> map = Maps.newLinkedHashMap();
        try (Scanner scan = table.scan(runScan)) {
            Row next;
            while ((limit > 0) && (next = scan.next()) != null) {
                MDSKey key = new MDSKey(next.getRow());
                byte[] columnValue = next.get(COLUMN);
                if (columnValue == null) {
                    continue;
                }
                T value = deserialize(key, columnValue, typeOfT);
                KeyValue<T> kv = new KeyValue<>(key, value);
                // Combined Filter doesn't pass
                if (combinedFilter != null && !combinedFilter.test(kv)) {
                    continue;
                }
                map.put(kv.getKey(), kv.getValue());
                limit--;
            }
            return map;
        }
    } catch (Exception e) {
        throw Throwables.propagate(e);
    }
}

Example 18 with Row

use of io.cdap.cdap.api.dataset.table.Row in project cdap by caskdata.

the class MetadataStoreDataset method getFirst.

/**
 * Get the first element in the row and default COLUMN, of type T
 *
 * @param id the mds key for the row
 * @param typeOfT the type of the result
 * @return the deserialized value of the result, null if not exist
 */
@Nullable
public <T> T getFirst(MDSKey id, Type typeOfT) {
    try {
        try (Scanner scan = table.scan(id.getKey(), Bytes.stopKeyForPrefix(id.getKey()))) {
            Row row = scan.next();
            if (row == null || row.isEmpty()) {
                return null;
            }
            byte[] value = row.get(COLUMN);
            if (value == null) {
                return null;
            }
            return deserialize(id, value, typeOfT);
        }
    } catch (Exception e) {
        throw Throwables.propagate(e);
    }
}

Example 19 with Row

use of io.cdap.cdap.api.dataset.table.Row in project cdap by caskdata.

the class DefaultPreviewStore method deleteExpiredData.

@Override
public void deleteExpiredData(long ttlInSeconds) {
    Gson gson = new GsonBuilder().registerTypeAdapter(EntityId.class, new EntityIdTypeAdapter()).create();
    byte[] startRowKey = new MDSKey.Builder().add(META_ROW_KEY_PREFIX).build().getKey();
    byte[] stopRowKey = new MDSKey(Bytes.stopKeyForPrefix(startRowKey)).getKey();
    long currentTimeInSeconds = System.currentTimeMillis() / 1000;
    try (Scanner scanner = previewTable.scan(startRowKey, stopRowKey, null, null, null)) {
        Row indexRow;
        while ((indexRow = scanner.next()) != null) {
            Map<byte[], byte[]> columns = indexRow.getColumns();
            String applicationIdGson = Bytes.toString(columns.get(APPID));
            if (applicationIdGson == null) {
                continue;
            }
            ApplicationId applicationId = gson.fromJson(applicationIdGson, ApplicationId.class);
            long applicationSubmitTime = RunIds.getTime(applicationId.getApplication(), TimeUnit.SECONDS);
            if ((currentTimeInSeconds - applicationSubmitTime) > ttlInSeconds) {
                remove(applicationId);
            }
        }
    } catch (IOException e) {
        throw new RuntimeException("Error while scanning the preview requests for deletion.", e);
    }
}

Example 20 with Row

use of io.cdap.cdap.api.dataset.table.Row in project cdap by caskdata.

the class DefaultPreviewStore method get.

@Override
public Map<String, List<JsonElement>> get(ApplicationId applicationId, String tracerName) {
    // PreviewStore is a singleton and we have to create gson for each operation since gson is not thread safe.
    Gson gson = new GsonBuilder().registerTypeAdapter(Schema.class, new SchemaTypeAdapter()).create();
    byte[] startRowKey = getPreviewRowKeyBuilder(DATA_ROW_KEY_PREFIX, applicationId).add(tracerName).build().getKey();
    byte[] stopRowKey = new MDSKey(Bytes.stopKeyForPrefix(startRowKey)).getKey();
    Map<String, List<JsonElement>> result = new HashMap<>();
    try (Scanner scanner = previewTable.scan(startRowKey, stopRowKey, null, null, null)) {
        Row indexRow;
        while ((indexRow = scanner.next()) != null) {
            Map<byte[], byte[]> columns = indexRow.getColumns();
            String propertyName = Bytes.toString(columns.get(PROPERTY));
            JsonElement value = gson.fromJson(Bytes.toString(columns.get(VALUE)), JsonElement.class);
            List<JsonElement> values = result.computeIfAbsent(propertyName, k -> new ArrayList<>());
            values.add(value);
        }
    } catch (IOException e) {
        String message = String.format("Error while reading preview data for application '%s' and tracer '%s'.", applicationId, tracerName);
        throw new RuntimeException(message, e);
    }
    return result;
}