Java ScanResult类代码示例

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
private void dumpTables() {
    for (String table : client.listTables().getTableNames()) {
        ScanResult scanResult;
        Map<String, AttributeValue> lastKey = null;
        do {
            scanResult = client.scan(new ScanRequest().withTableName(table).withExclusiveStartKey(lastKey));
            lastKey = scanResult.getLastEvaluatedKey();
            for (Map<String, AttributeValue> map : scanResult.getItems()) {
                for (Map.Entry<String, AttributeValue> item : map.entrySet()) {
                    System.out.print("item.put(\"");
                    System.out.print(item.getKey());
                    System.out.print("\", b642Av(\"");
                    System.out.print(Base64.encodeAsString(AttributeValueMarshaller.marshall(item.getValue()).array()));
                    System.out.println("\"));");
                }
                System.out.print("ddb.putItem(new PutItemRequest(\"");
                System.out.print(table);
                System.out.println("\", item));");
                System.out.println("item.clear();");
                System.out.println();
            }
        } while (lastKey != null);

    }
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
/**
 * Gets all.
 *
 * @return the all
 */
public Collection<Ticket> getAll() {
    final Collection<Ticket> tickets = new ArrayList<>();
    final Collection<TicketDefinition> metadata = this.ticketCatalog.findAll();
    metadata.forEach(r -> {
        final ScanRequest scan = new ScanRequest(r.getProperties().getStorageName());
        LOGGER.debug("Scanning table with request [{}]", scan);
        final ScanResult result = this.amazonDynamoDBClient.scan(scan);
        LOGGER.debug("Scanned table with result [{}]", scan);

        tickets.addAll(result.getItems()
                .stream()
                .map(DynamoDbTicketRegistryFacilitator::deserializeTicket)
                .collect(Collectors.toList()));
    });
    return tickets;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
@Override
public PropertySource<?> locate(final Environment environment) {
    final AmazonDynamoDBClient amazonDynamoDBClient = getAmazonDynamoDbClient(environment);
    createSettingsTable(amazonDynamoDBClient, false);

    final ScanRequest scan = new ScanRequest(TABLE_NAME);
    LOGGER.debug("Scanning table with request [{}]", scan);
    final ScanResult result = amazonDynamoDBClient.scan(scan);
    LOGGER.debug("Scanned table with result [{}]", scan);

    final Properties props = new Properties();
    result.getItems()
            .stream()
            .map(DynamoDbCloudConfigBootstrapConfiguration::retrieveSetting)
            .forEach(p -> props.put(p.getKey(), p.getValue()));
    return new PropertiesPropertySource(getClass().getSimpleName(), props);
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
public RetryResult<ScanResult> scanTable(
    String tableName, DynamoDBQueryFilter dynamoDBQueryFilter, Integer segment, Integer
    totalSegments, Map<String, AttributeValue> exclusiveStartKey, long limit, Reporter reporter) {
  final ScanRequest scanRequest = new ScanRequest(tableName)
      .withExclusiveStartKey(exclusiveStartKey)
      .withLimit(Ints.checkedCast(limit))
      .withSegment(segment)
      .withTotalSegments(totalSegments)
      .withReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL);

  if (dynamoDBQueryFilter != null) {
    Map<String, Condition> scanFilter = dynamoDBQueryFilter.getScanFilter();
    if (!scanFilter.isEmpty()) {
      scanRequest.setScanFilter(scanFilter);
    }
  }

  RetryResult<ScanResult> retryResult = getRetryDriver().runWithRetry(new Callable<ScanResult>() {
    @Override
    public ScanResult call() {
      log.debug("Executing DynamoDB scan: " + scanRequest);
      return dynamoDB.scan(scanRequest);
    }
  }, reporter, PrintCounter.DynamoDBReadThrottle);
  return retryResult;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
@Override
protected PageResults<Map<String, AttributeValue>> fetchPage(RequestLimit lim) {
  // Read from DynamoDB
  RetryResult<ScanResult> retryResult = context.getClient().scanTable(tableName, null, segment,
      context.getSplit().getTotalSegments(), lastEvaluatedKey, lim.items, context.getReporter());

  ScanResult result = retryResult.result;
  int retries = retryResult.retries;

  double consumedCapacityUnits = 0.0;
  if (result.getConsumedCapacity() != null) {
    consumedCapacityUnits = result.getConsumedCapacity().getCapacityUnits();
  }
  return new PageResults<>(result.getItems(), result.getLastEvaluatedKey(), consumedCapacityUnits,
      retries);
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
private ScanResult getHashNumberRangeKeyItems(String[] hashKeys, String hashType) {
  List<Map<String, AttributeValue>> items = new ArrayList<>();
  for (String key : hashKeys) {
    for (Integer i = 0; i < NUM_RANGE_KEYS_PER_HASH_KEY; i++) {
      Map<String, AttributeValue> item = new HashMap<>();
      if (hashType.equals("S")) {
        item.put("hashKey", new AttributeValue(key));
      } else {
        item.put("hashKey", new AttributeValue().withN(key));
      }
      item.put("rangeKey", new AttributeValue().withN("0" + i.toString()));
      items.add(item);
    }
  }
  return new ScanResult().withScannedCount(items.size()).withItems(items).withConsumedCapacity
      (new ConsumedCapacity().withCapacityUnits(1d));
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
public ScanResult scan(final ScanRequest request, final int permitsToConsume) throws BackendException {
    setUserAgent(request);
    ScanResult result;
    timedReadThrottle(SCAN, request.getTableName(), permitsToConsume);

    final Timer.Context apiTimerContext = getTimerContext(SCAN, request.getTableName());
    try {
        result = client.scan(request);
    } catch (Exception e) {
        throw processDynamoDbApiException(e, SCAN, request.getTableName());
    } finally {
        apiTimerContext.stop();
    }
    meterConsumedCapacity(SCAN, result.getConsumedCapacity());
    measureItemCount(SCAN, request.getTableName(), result.getCount());
    return result;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
@SuppressFBWarnings(value = "IT_NO_SUCH_ELEMENT",
    justification = "https://github.com/awslabs/dynamodb-janusgraph-storage-backend/issues/222")
@Override
public ScanResult next() {
    final Scan backoff = new Scan(request, delegate, lastConsumedCapacity);
    ScanResult result = null;
    try {
        result = backoff.runWithBackoff(); //this will be non-null or runWithBackoff throws
    } catch (BackendException e) {
        throw new BackendRuntimeException(e);
    }

    if (result.getConsumedCapacity() != null) {
        lastConsumedCapacity = result.getConsumedCapacity().getCapacityUnits().intValue();
    }

    if (result.getLastEvaluatedKey() != null && !result.getLastEvaluatedKey().isEmpty()) {
        hasNext = true;
        request.setExclusiveStartKey(result.getLastEvaluatedKey());
    } else {
        hasNext = false;
    }

    return result;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
/**
 * Returns the list of usernames stored in the identity table.
 * 
 * @return list of existing usernames in DynamoDB table
 */
public List<String> listUsers() {
    List<String> users = new ArrayList<String>(1000);

    ScanResult result = ddb.scan(new ScanRequest().withTableName(USER_TABLE).withLimit(1000));

    for (Map<String, AttributeValue> item : result.getItems()) {
        String s = "";

        for (Entry<String, AttributeValue> entry : item.entrySet()) {
            s += " ** " + entry.getKey() + " = " + entry.getValue().getS();
        }

        users.add(s);
    }

    return users;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
/**
 * @return the list of device ID (UID) stored in the identity table.
 */
public List<String> listDevices() {
    List<String> devices = new ArrayList<String>(1000);

    ScanResult result = ddb.scan(new ScanRequest().withTableName(DEVICE_TABLE).withLimit(1000));

    for (Map<String, AttributeValue> item : result.getItems()) {
        String s = "";

        for (Entry<String, AttributeValue> entry : item.entrySet()) {
            s += " ** " + entry.getKey() + " = " + entry.getValue().getS();
        }

        devices.add(s);
    }

    return devices;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
/**
 * begins a scan with an exponential back off if throttled.
 */
public ScanResult runWithBackoff() {
    ScanResult result = null;
    boolean interrupted = false;
    try {
        do {
            try {
                result = client.scan(request);
            } catch (Exception e) {
                try {
                    Thread.sleep(exponentialBackoffTime);
                } catch (InterruptedException ie) {
                    interrupted = true;
                } finally {
                    exponentialBackoffTime *= 2;
                }
                continue;
            }
        } while (result == null);
        return result;
    } finally {
        if (interrupted) {
            Thread.currentThread().interrupt();
        }
    }
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
@Override
public List<LandUnit> getLandUnits(Long userId) {
    List<LandUnit> retval = new ArrayList<LandUnit>();
    try {
        /*
         * Scan items for movies with user id attribute.
         */
        Map<String, Condition> scanFilter = new HashMap<String, Condition>();
        Condition condition = new Condition()
            .withComparisonOperator(ComparisonOperator.EQ.toString())
            .withAttributeValueList(new AttributeValue().withN(userId.toString()));
        scanFilter.put(LandUnit.USER_ID_ATTR_NAME, condition);
        ScanRequest scanRequest =
                new ScanRequest(LANDUNIT_DYNAMO_DB_TABLE_NAME).withScanFilter(scanFilter);
        ScanResult scanResult = dynamoDB.scan(scanRequest);
        LOG.debug("DDB Scan Result: " + scanResult);
        retval = mapItemsToLandUnit(scanResult.getItems());
    } catch (Exception e) {
        LOG.error("Unable to retrieve land units from DDB " + e.getMessage());
    }
    return retval;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
/**
 * Generate a list of attribute names found in the Aggregator's dynamo
 * table. Assumes that all Items in the Aggregator table are of the same
 * structure.
 * 
 * @param dynamoClient
 *            Dynamo DB Client to use for connection to Dynamo DB.
 * @param dynamoTable
 *            The Dynamo Table for the Aggregator
 * @return A list of attribute names from the Dynamo table
 * @throws Exception
 */
public static List<String> getDictionaryEntry(
		final AmazonDynamoDB dynamoClient, final String dynamoTable)
		throws Exception {
	// get a list of all columns in the table, with keys first
	List<String> columns = new ArrayList<>();
	List<KeySchemaElement> keys = dynamoClient.describeTable(dynamoTable)
			.getTable().getKeySchema();
	for (KeySchemaElement key : keys) {
		columns.add(key.getAttributeName());
	}
	ScanResult scan = dynamoClient.scan(new ScanRequest()
			.withTableName(dynamoTable).withSelect(Select.ALL_ATTRIBUTES)
			.withLimit(1));
	List<Map<String, AttributeValue>> scannedItems = scan.getItems();
	for (Map<String, AttributeValue> map : scannedItems) {
		for (String s : map.keySet()) {
			if (!columns.contains(s))
				columns.add(s);
		}
	}

	return columns;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
/**
 * Generate a list of attribute names found in the Aggregator's dynamo
 * table. Assumes that all Items in the Aggregator table are of the same
 * structure.
 * 
 * @param dynamoClient Dynamo DB Client to use for connection to Dynamo DB.
 * @param dynamoTable The Dynamo Table for the Aggregator
 * @return A list of attribute names from the Dynamo table
 * @throws Exception
 */
protected List<String> getDictionaryEntry() throws Exception {
    // get a list of all columns in the table, with keys first
    List<String> columns = new ArrayList<>();
    List<KeySchemaElement> keys = dynamoClient.describeTable(this.tableName).getTable().getKeySchema();
    for (KeySchemaElement key : keys) {
        columns.add(key.getAttributeName());
    }
    ScanResult scan = dynamoClient.scan(new ScanRequest().withTableName(this.tableName).withSelect(
            Select.ALL_ATTRIBUTES).withLimit(1));
    List<Map<String, AttributeValue>> scannedItems = scan.getItems();
    for (Map<String, AttributeValue> map : scannedItems) {
        for (String s : map.keySet()) {
            if (!columns.contains(s))
                columns.add(s);
        }
    }

    return columns;
}
 

import com.amazonaws.services.dynamodbv2.model.ScanResult; //导入依赖的package包/类
private static void findProductsForPriceLessThanZero() {
    
    Map<String, AttributeValue> expressionAttributeValues = new HashMap<String, AttributeValue>();
    expressionAttributeValues.put(":pr", new AttributeValue().withN("100"));
    
    ScanRequest scanRequest = new ScanRequest()
        .withTableName(tableName)
        .withFilterExpression("Price < :pr")
        .withExpressionAttributeValues(expressionAttributeValues)
        .withProjectionExpression("Id, Title, ProductCategory, Price");

    ScanResult result = client.scan(scanRequest);
    
    System.out.println("Scan of " + tableName + " for items with a price less than 100.");
    for (Map<String, AttributeValue> item : result.getItems()) {
        System.out.println("");
        printItem(item);
    }
}