Examples of com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperFieldModel.DynamoDBAttributeType

Package com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperFieldModel

Examples of com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperFieldModel.DynamoDBAttributeType

com.amazonaws.services.dynamodbv2.model.WriteRequest
Object mapper for domain-object interaction with DynamoDB.
To use, annotate domain classes with the annotations found in the com.amazonaws.services.dynamodbv2.datamodeling package. A minimal example:
```
 @DynamoDBTable(tableName = "TestTable") public class TestClass { private Long key; private double rangeKey; private Long version; private Set<Integer> integerSetAttribute; @DynamoDBHashKey public Long getKey() { return key; } public void setKey(Long key) { this.key = key; } @DynamoDBRangeKey public double getRangeKey() { return rangeKey; } public void setRangeKey(double rangeKey) { this.rangeKey = rangeKey; } @DynamoDBAttribute(attributeName = "integerSetAttribute") public Set<Integer> getIntegerAttribute() { return integerSetAttribute; } public void setIntegerAttribute(Set<Integer> integerAttribute) { this.integerSetAttribute = integerAttribute; } @DynamoDBVersionAttribute public Long getVersion() { return version; } public void setVersion(Long version) { this.version = version; } } 
```
Save instances of annotated classes to DynamoDB, retrieve them, and delete them using the {@link DynamoDBMapper} class, as in the following example.
```
 DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient); Long hashKey = 105L; double rangeKey = 1.0d; TestClass obj = mapper.load(TestClass.class, hashKey, rangeKey); obj.getIntegerAttribute().add(42); mapper.save(obj); mapper.delete(obj); 
```
When using the save, load, and delete methods, {@link DynamoDBMapper} willthrow {@link DynamoDBMappingException}s to indicate that domain classes are incorrectly annotated or otherwise incompatible with this class. Service exceptions will always be propagated as {@link AmazonClientException}, and DynamoDB-specific subclasses such as {@link ConditionalCheckFailedException}will be used when possible.
This class is thread-safe and can be shared between threads. It's also very lightweight, so it doesn't need to be. @see DynamoDBTable @see DynamoDBHashKey @see DynamoDBRangeKey @see DynamoDBAutoGeneratedKey @see DynamoDBAttribute @see DynamoDBVersionAttribute @see DynamoDBIgnore @see DynamoDBMarshalling @see DynamoDBMapperConfig

        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;
    }

View Full Code Here

    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);
    }

View Full Code Here

    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;
    }

View Full Code Here

        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;
    }

View Full Code Here

      /**
       * 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.");

View Full Code Here

  }
  
  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();
    }

View Full Code Here

                            }
                        }
                    }
                    if ( doUpdateItem ) {
                        /* Send an updateItem request. */
                        db.updateItem(applyUserAgent(new UpdateItemRequest()
                                .withTableName(getTableName())
                                .withKey(getKeyAttributeValues())
                                .withAttributeUpdates(
                                        transformAttributeUpdates(this.clazz,
                                                getKeyAttributeValues(), getAttributeValueUpdates()))

View Full Code Here

                            }
                        }
                    }
                    if ( doUpdateItem ) {
                        /* Send an updateItem request. */
                        db.updateItem(applyUserAgent(new UpdateItemRequest()
                                .withTableName(getTableName())
                                .withKey(getKeyAttributeValues())
                                .withAttributeUpdates(
                                        transformAttributeUpdates(this.clazz,
                                                getKeyAttributeValues(), getAttributeValueUpdates()))

View Full Code Here

            if ( !requestItems.containsKey(tableName) ) {
                requestItems.put(tableName, new LinkedList<WriteRequest>());
            }


            requestItems.get(tableName).add(
                    new WriteRequest().withPutRequest(new PutRequest().withItem(transformAttributes(clazz, attributeValues))));
        }


        for ( Object toDelete : objectsToDelete ) {
            Class<?> clazz = toDelete.getClass();


            String tableName = getTableName(clazz, config);


            Map<String, AttributeValue> key = getKey(toDelete);


            if ( !requestItems.containsKey(tableName) ) {
                requestItems.put(tableName, new LinkedList<WriteRequest>());
            }


            requestItems.get(tableName).add(
                    new WriteRequest().withDeleteRequest(new DeleteRequest().withKey(key)));
        }


        // Break into chunks of 25 items and make service requests to DynamoDB
        while ( !requestItems.isEmpty() ) {
            HashMap<String, List<WriteRequest>> batch = new HashMap<String, List<WriteRequest>>();
            int i = 0;
            Iterator<Entry<String, List<WriteRequest>>> tableIter = requestItems.entrySet().iterator();
            while ( tableIter.hasNext() && i < 25 ) {
                Entry<String, List<WriteRequest>> tableRequest = tableIter.next();
                batch.put(tableRequest.getKey(), new LinkedList<WriteRequest>());
                Iterator<WriteRequest> writeRequestIter = tableRequest.getValue().iterator();
                while ( writeRequestIter.hasNext() && i++ < 25 ) {
                    WriteRequest writeRequest = writeRequestIter.next();
                    batch.get(tableRequest.getKey()).add(writeRequest);
                    writeRequestIter.remove();
                }


                // If we've processed all the write requests for this table,

View Full Code Here

            if ( !requestItems.containsKey(tableName) ) {
                requestItems.put(tableName, new LinkedList<WriteRequest>());
            }


            requestItems.get(tableName).add(
                    new WriteRequest().withPutRequest(new PutRequest().withItem(transformAttributes(clazz, attributeValues))));
        }


        for ( Object toDelete : objectsToDelete ) {
            Class<?> clazz = toDelete.getClass();


            String tableName = getTableName(clazz, config);


            Map<String, AttributeValue> key = getKey(toDelete);


            if ( !requestItems.containsKey(tableName) ) {
                requestItems.put(tableName, new LinkedList<WriteRequest>());
            }


            requestItems.get(tableName).add(
                    new WriteRequest().withDeleteRequest(new DeleteRequest().withKey(key)));
        }


        // Break into chunks of 25 items and make service requests to DynamoDB
        while ( !requestItems.isEmpty() ) {
            HashMap<String, List<WriteRequest>> batch = new HashMap<String, List<WriteRequest>>();
            int i = 0;
            Iterator<Entry<String, List<WriteRequest>>> tableIter = requestItems.entrySet().iterator();
            while ( tableIter.hasNext() && i < 25 ) {
                Entry<String, List<WriteRequest>> tableRequest = tableIter.next();
                batch.put(tableRequest.getKey(), new LinkedList<WriteRequest>());
                Iterator<WriteRequest> writeRequestIter = tableRequest.getValue().iterator();
                while ( writeRequestIter.hasNext() && i++ < 25 ) {
                    WriteRequest writeRequest = writeRequestIter.next();
                    batch.get(tableRequest.getKey()).add(writeRequest);
                    writeRequestIter.remove();
                }


                // If we've processed all the write requests for this table,

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperFieldModel.DynamoDBAttributeType

AmazonDynamoDBSample

com.amazonaws.auth.DefaultAWSCredentialsProviderChain

com.amazonaws.ClientConfiguration

com.amazonaws.handlers.HandlerChainFactory

com.amazonaws.http.ExecutionContext

com.amazonaws.http.JsonErrorResponseHandler

com.amazonaws.internal.StaticCredentialsProvider

com.amazonaws.metrics.internal.cloudwatch.provider.transform.DynamoDBRequestMetricTransformer

com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringAttributeMarshaller

com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringSetAttributeMarshaller

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.