Examples of com.amazonaws.services.dynamodb.model.BatchGetItemRequest

Package com.amazonaws.services.dynamodb.model

Examples of com.amazonaws.services.dynamodb.model.BatchGetItemRequest

com.amazonaws.services.dynamodb.model.BatchGetItemRequest
Container for the parameters to the {@link com.amazonaws.services.dynamodb.AmazonDynamoDB#batchGetItem(BatchGetItemRequest) BatchGetItem operation}.
Retrieves the attributes for multiple items from multiple tables using their primary keys.

The maximum number of item attributes that can be retrieved for a single operation is 100. Also, the number of items retrieved is constrained by a 1 MB the size limit. If the response size limit is exceeded or a partial result is returned due to an internal processing failure, Amazon DynamoDB returns an UnprocessedKeys value so you can retry the operation starting with the next item to get.

Amazon DynamoDB automatically adjusts the number of items returned per page to enforce this limit. For example, even if you ask to retrieve 100 items, but each individual item is 50k in size, the system returns 20 items and an appropriate UnprocessedKeys value so you can get the next page of results. If necessary, your application needs its own logic to assemble the pages of results into one set.
@see com.amazonaws.services.dynamodb.AmazonDynamoDB#batchGetItem(BatchGetItemRequest)

    public Boolean supports(Class clazz) {
        return BatchGetItemRequest.class.isAssignableFrom(clazz);
    }


    public List<Error> validate(Object target) {
        BatchGetItemRequest instance = (BatchGetItemRequest) target;
        List<Error> errors = new ArrayList<Error>();
      //TODO: Redo this logic, look at whole request object
        for (String tablename : instance.getRequestItems().keySet()) {
            errors.addAll(ValidatorUtils.invokeValidator(new TableNameValidator(), tablename));
            errors.addAll(ValidatorUtils.invokeValidator(new KeysAndAttributesValidator(), instance.getRequestItems().get(tablename)));
        }
        return removeNulls(errors);
    }

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import com.fasterxml.jackson.core.JsonToken;


public class BatchGetItemRequestJsonUnmarshaller implements Unmarshaller<BatchGetItemRequest, JsonUnmarshallerContext> {


    public BatchGetItemRequest unmarshall(JsonUnmarshallerContext context) throws Exception {
        BatchGetItemRequest request = new BatchGetItemRequest();


        int originalDepth = context.getCurrentDepth();
        int targetDepth = originalDepth + 1;


        JsonToken token = context.currentToken;
        if (token == null) token = context.nextToken();


       while (true) {
            if (token == null) break;
            if (token == JsonToken.FIELD_NAME || token == JsonToken.START_OBJECT) {
                if (context.testExpression("RequestItems", targetDepth)) {
                    request.setRequestItems(new MapUnmarshaller<String, KeysAndAttributes>(SimpleTypeJsonUnmarshallers.StringJsonUnmarshaller.getInstance(), KeysAndAttributesJsonUnmarshaller.getInstance()).unmarshall(context));
                }
            } else if (token == JsonToken.END_ARRAY || token == JsonToken.END_OBJECT) {
                if (context.getCurrentDepth() <= originalDepth) break;
            }
            token = context.nextToken();

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        batchGetItemResult.setUnprocessedKeys(new HashMap<String, KeysAndAttributes>());
    return batchGetItemResult;
  }


  public com.amazonaws.services.dynamodbv2.model.BatchGetItemResult batchGetItemV2(com.amazonaws.services.dynamodbv2.model.BatchGetItemRequest v2Request) {
        BatchGetItemRequest request = AlternatorDBApiVersion2Mapper.MapV2BatchGetItemRequestToV1(v2Request, this.tables);
        BatchGetItemResult result = batchGetItem(request);
        final Set<String> requestedTables = v2Request.getRequestItems().keySet();
        return AlternatorDBApiVersion2Mapper.MapV1BatchGetItemResultToV2(result, this.tables, requestedTables);
  }

View Full Code Here

    }


  @Test
  public void vanillaBatchGetItemTest() throws Exception {
        this.vanillaBatchWriteItemTest();
        BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest();
        Map<String, KeysAndAttributes> requestItems = new HashMap<String, KeysAndAttributes>();
        KeysAndAttributes keysAndAttributes = new KeysAndAttributes();
        List<String> attributesToGet = new ArrayList<String>();
        attributesToGet.add(hashKeyValue1);
        keysAndAttributes.setAttributesToGet(attributesToGet);
        List<Key> keys = new ArrayList<Key>();


        KeysAndAttributes keysAndAttributes1 = new KeysAndAttributes();
        List<String> attributesToGet1 = new ArrayList<String>();
        attributesToGet1.add(hashKeyValue2);
        keysAndAttributes1.setAttributesToGet(attributesToGet1);
        //Test case 1: Every request has matches.
//        keys.add(new Key(new AttributeValue("4")));
//        keys.add(new Key(new AttributeValue("5")));
//        keys.add(new Key(new AttributeValue("3")));


        //Test case 2: Requests has no match.
        keys.add(new Key(new AttributeValue("1")));


        //Test case 3: Complicated test, some requests has matches, some doesn't.
//        keys.add(new Key(new AttributeValue("7")));
//        keys.add(new Key(new AttributeValue("4")));


        //Test case 4: Duplicated request
        //Duplicated requests return duplicated results.
//        keys.add(new Key(new AttributeValue("7")));
//        keys.add(new Key(new AttributeValue("7")));
//        keys.add(new Key(new AttributeValue("4")));
//        keys.add(new Key(new AttributeValue("4")));


        keysAndAttributes.setKeys(keys);
        keysAndAttributes1.setKeys(keys);
        //Test case for Exception: Table doesn't exist.
//        requestItems.put("Vito's Table", keysAndAttributes);


        // Normal test
        // TODO: Multi table test failed. Need to be fixed.
        requestItems.put(tableName1, keysAndAttributes);
        requestItems.put(tableName2, keysAndAttributes1);


        batchGetItemRequest.withRequestItems(requestItems);
    BatchGetItemResult result  = getClient().batchGetItem(batchGetItemRequest);
        Assert.assertNotNull("UnprocessedKeys should be empty rather than null.", result.getUnprocessedKeys());
  }

View Full Code Here

    }


    private void processBatchGetRequest(Map<String, Class<?>> tableNameToClassMapper,
            Map<String, KeysAndAttributes> requestItems, Map<String, List<Object>> resultSet) {
        BatchGetItemResult batchGetItemResult = null;
        BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest();
        batchGetItemRequest.setRequestItems(requestItems);
        do {
            if (batchGetItemResult != null) {
                batchGetItemRequest.setRequestItems(batchGetItemResult.getUnprocessedKeys());
            }


            batchGetItemResult = db.batchGetItem(batchGetItemRequest);
            Map<String, BatchResponse> responses = batchGetItemResult.getResponses();
            for (String tableName : responses.keySet()) {

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    }


    private void processBatchGetRequest(Map<String, Class<?>> tableNameToClassMapper,
            Map<String, KeysAndAttributes> requestItems, Map<String, List<Object>> resultSet) {
        BatchGetItemResult batchGetItemResult = null;
        BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest();
        batchGetItemRequest.setRequestItems(requestItems);
        do {
            if (batchGetItemResult != null) {
                batchGetItemRequest.setRequestItems(batchGetItemResult.getUnprocessedKeys());
            }


            batchGetItemResult = db.batchGetItem(batchGetItemRequest);
            Map<String, BatchResponse> responses = batchGetItemResult.getResponses();
            for (String tableName : responses.keySet()) {

View Full Code Here

    }


    private void processBatchGetRequest(Map<String, Class<?>> tableNameToClassMapper,
            Map<String, KeysAndAttributes> requestItems, Map<String, List<Object>> resultSet) {
        BatchGetItemResult batchGetItemResult = null;
        BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest();
        batchGetItemRequest.setRequestItems(requestItems);
        do {
            if (batchGetItemResult != null) {
                batchGetItemRequest.setRequestItems(batchGetItemResult.getUnprocessedKeys());
            }


            batchGetItemResult = db.batchGetItem(batchGetItemRequest);
            Map<String, BatchResponse> responses = batchGetItemResult.getResponses();
            for (String tableName : responses.keySet()) {

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