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

Package com.amazonaws.services.dynamodbv2.model

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

com.amazonaws.services.dynamodbv2.model.ScanResult
aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html"> Limits section in the Amazon DynamoDB Developer Guide.

The table must be in the ACTIVE state for this operation to succeed. UpdateTable is an asynchronous operation; while executing the operation, the table is in the UPDATING state. While the table is in the UPDATING state, the table still has the provisioned throughput from before the call. The new provisioned throughput setting is in effect only when the table returns to the ACTIVE state after the UpdateTable operation.

You cannot add, modify or delete indexes using UpdateTable . Indexes can only be defined at table creation time.
@see com.amazonaws.services.dynamodbv2.AmazonDynamoDB#updateTable(UpdateTableRequest)

    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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        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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    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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    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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        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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