Examples of com.amazonaws.services.dynamodbv2.datamodeling.ConversionSchemas

Package com.amazonaws.services.dynamodbv2.datamodeling

Examples of com.amazonaws.services.dynamodbv2.datamodeling.ConversionSchemas

com.amazonaws.services.dynamodbv2.model.ScanResult
Pre-defined strategies for mapping between Java types and DynamoDB types.

            config = new DynamoDBMapperConfig(this.config, config);
        return config;
    }


    private ScanRequest createScanRequestFromExpression(Class<?> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        ScanRequest scanRequest = new ScanRequest();
        scanRequest.setTableName(getTableName(clazz, config));
        scanRequest.setScanFilter(scanExpression.getScanFilter());
        scanRequest.setLimit(scanExpression.getLimit());
        scanRequest.setExclusiveStartKey(scanExpression.getExclusiveStartKey());


        return scanRequest;
    }

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    private List<ScanRequest> createParallelScanRequestsFromExpression(Class<?> clazz, DynamoDBScanExpression scanExpression, int totalSegments, DynamoDBMapperConfig config) {
      if (totalSegments < 1)
      throw new IllegalArgumentException("Parallel scan should have at least one scan segment.");
      List<ScanRequest> parallelScanRequests= new LinkedList<ScanRequest>();
        for (int segment = 0; segment < totalSegments; segment++) {
          ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);
          parallelScanRequests.add(scanRequest.withSegment(segment).withTotalSegments(totalSegments));
        }
        return parallelScanRequests;
    }

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     * @see PaginatedScanList
     */
    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);
    }

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     *            default provided at object construction.
     */
    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>();
        result.setResults(marshallIntoObjects(clazz, scanResult.getItems()));
        result.setLastEvaluatedKey(scanResult.getLastEvaluatedKey());

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     *         item data.
     */
    public int count(Class<?> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        config = mergeConfig(config);


        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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            config = new DynamoDBMapperConfig(this.config, config);
        return config;
    }


    private ScanRequest createScanRequestFromExpression(Class<?> clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config) {
        ScanRequest scanRequest = new ScanRequest();
        scanRequest.setTableName(getTableName(clazz, config));
        scanRequest.setScanFilter(scanExpression.getScanFilter());
        scanRequest.setLimit(scanExpression.getLimit());
        scanRequest.setExclusiveStartKey(scanExpression.getExclusiveStartKey());


        return scanRequest;
    }

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    private List<ScanRequest> createParallelScanRequestsFromExpression(Class<?> clazz, DynamoDBScanExpression scanExpression, int totalSegments, DynamoDBMapperConfig config) {
      if (totalSegments < 1)
      throw new IllegalArgumentException("Parallel scan should have at least one scan segment.");
      List<ScanRequest> parallelScanRequests= new LinkedList<ScanRequest>();
        for (int segment = 0; segment < totalSegments; segment++) {
          ScanRequest scanRequest = createScanRequestFromExpression(clazz, scanExpression, config);
          parallelScanRequests.add(scanRequest.withSegment(segment).withTotalSegments(totalSegments));
        }
        return parallelScanRequests;
    }

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    }
    return scanResults;
  }
  
  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.

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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());
    }

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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>();
        result.setResults(marshallIntoObjects(clazz, scanResult.getItems()));
        result.setLastEvaluatedKey(scanResult.getLastEvaluatedKey());


        return result;
    }

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