Examples of com.amazonaws.services.dynamodbv2.model.ScanResult

Package com.amazonaws.services.dynamodbv2.model

Examples of com.amazonaws.services.dynamodbv2.model.ScanResult

com.amazonaws.services.dynamodbv2.model.ScanResult

Represents the output of a Scan operation.

    public <T> PaginatedScanList<T> scan(Class<T> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);


        ScanResult scanResult = db.scan(applyUserAgent(scanRequest));
        return new PaginatedScanList<T>(this, clazz, db, scanRequest, scanResult, config.getPaginationLoadingStrategy(), config);
    }

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    public <T> ScanResultPage<T> scanPage(Class<T> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);


        ScanResult scanResult = db.scan(applyUserAgent(scanRequest));
        ScanResultPage<T> result = new ScanResultPage<T>();
        List<AttributeTransformer.Parameters<T>> parameters =
            toParameters(scanResult.getItems(), clazz, config);


        result.setResults(marshalIntoObjects(parameters));
        result.setLastEvaluatedKey(scanResult.getLastEvaluatedKey());


        return result;
    }

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        ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);
        scanRequest.setSelect(Select.COUNT);


        // Count scans can also be truncated for large datasets
        int count = 0;
        ScanResult scanResult = null;
        do {
            scanResult = db.scan(applyUserAgent(scanRequest));
            count += scanResult.getCount();
            scanRequest.setExclusiveStartKey(scanResult.getLastEvaluatedKey());
        } while (scanResult.getLastEvaluatedKey() != null);


        return count;
    }

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      if (!StringUtils.isBlank(pager.getLastKey())) {
        scanRequest.setExclusiveStartKey(Collections.singletonMap(Config._KEY,
            new AttributeValue(pager.getLastKey())));
      }


      ScanResult result = client().scan(scanRequest);
      logger.debug("readPage() CC: {}", result.getConsumedCapacity());


      for (Map<String, AttributeValue> item : result.getItems()) {
        P obj = fromRow(item);
        if (obj != null) {
          results.add(obj);
        }
      }
      if (result.getCount() > 0 && results.isEmpty() && result.getLastEvaluatedKey() != null) {
        pager.setLastKey(result.getLastEvaluatedKey().get(Config._KEY).getS());
        return readPage(appid, pager);
      }
    } catch (Exception e) {
      logger.error(null, e);
    }

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    public <T> PaginatedScanList<T> scan(Class<T> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);


        ScanResult scanResult = db.scan(applyUserAgent(scanRequest));
        return new PaginatedScanList<T>(this, clazz, db, scanRequest, scanResult, config.getPaginationLoadingStrategy(), config);
    }

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    public <T> ScanResultPage<T> scanPage(Class<T> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);


        ScanResult scanResult = db.scan(applyUserAgent(scanRequest));
        ScanResultPage<T> result = new ScanResultPage<T>();
        List<AttributeTransformer.Parameters<T>> parameters =
            toParameters(scanResult.getItems(), clazz, scanRequest.getTableName(), config);


        result.setResults(marshalIntoObjects(parameters));
        result.setLastEvaluatedKey(scanResult.getLastEvaluatedKey());


        return result;
    }

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        ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);
        scanRequest.setSelect(Select.COUNT);


        // Count scans can also be truncated for large datasets
        int count = 0;
        ScanResult scanResult = null;
        do {
            scanResult = db.scan(applyUserAgent(scanRequest));
            count += scanResult.getCount();
            scanRequest.setExclusiveStartKey(scanResult.getLastEvaluatedKey());
        } while (scanResult.getLastEvaluatedKey() != null);


        return count;
    }

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      /**
       * Get the ScanResult from cache if the segment scan has finished.
       */
      else if (currentSegmentState == SegmentScanState.HasNextPage
          || currentSegmentState == SegmentScanState.SegmentScanCompleted) {
        ScanResult scanResult = segmentScanResults.get(segment);
        scanResults.add(scanResult);
      }
      else if (currentSegmentState == SegmentScanState.Waiting
          || currentSegmentState == SegmentScanState.Scanning){
        throw new AmazonClientException("Should never see a 'Scanning' or 'Waiting' state when marshalling parallel scan results.");

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  }
  
  private ScanResult scanNextPageOfSegment(int currentSegment, boolean checkLastEvaluatedKey) {
    ScanRequest segmentScanRequest = parallelScanRequests.get(currentSegment);
    if (checkLastEvaluatedKey) {
      ScanResult lastScanResult = segmentScanResults.get(currentSegment);
      segmentScanRequest.setExclusiveStartKey(lastScanResult.getLastEvaluatedKey());
    } else {
      segmentScanRequest.setExclusiveStartKey(null);
    }
    ScanResult scanResult = dynamo.scan(mapper.applyUserAgent(segmentScanRequest));
    
    /**
     * Cache the scan result in segmentScanResults.
     * We should never try to get these scan results by calling get() on the cached future tasks.
     */
    segmentScanResults.set(currentSegment, scanResult);
    
    /**
     * Update the state and notify any waiting thread.
     */
    synchronized(segmentScanStates) {
      if (null == scanResult.getLastEvaluatedKey())
        segmentScanStates.set(currentSegment, SegmentScanState.SegmentScanCompleted);
      else
        segmentScanStates.set(currentSegment, SegmentScanState.HasNextPage);
      segmentScanStates.notifyAll();
    }

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        request.setSelect(Select.SPECIFIC_ATTRIBUTES);
        request.withAttributesToGet(
                SessionTableAttributes.SESSION_ID_KEY,
                SessionTableAttributes.LAST_UPDATED_AT_ATTRIBUTE);


        ScanResult scanResult = null;
        do {
            if (scanResult != null) request.setExclusiveStartKey(scanResult.getLastEvaluatedKey());


            scanResult = dynamo.scan(request);
            List<Map<String,AttributeValue>> items = scanResult.getItems();
            for (Map<String, AttributeValue> item : items) {
                if (isExpired(Long.parseLong(item.get(SessionTableAttributes.LAST_UPDATED_AT_ATTRIBUTE).getN()))) {
                    String sessionId = item.get(SessionTableAttributes.SESSION_ID_KEY).getS();
                    DynamoUtils.deleteSession(dynamo, tableName, sessionId);
                }
            }
        } while (scanResult.getLastEvaluatedKey() != null);
    }

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