AWS DynamoDB

Since Camel 3.1

Only producer is supported

The AWS2 DynamoDB component supports storing and retrieving data from/to Amazon’s DynamoDB service.

Prerequisites

You must have a valid Amazon Web Services developer account, and be signed up to use Amazon DynamoDB. More information is available at Amazon DynamoDB.

URI Format

aws2-ddb://domainName[?options]

You can append query options to the URI in the following format, ?options=value&option2=value&…​

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL as a type safe way of configuring endpoints.

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

The following two sections lists all the options, firstly for the component followed by the endpoint.

Component Options

The AWS DynamoDB component supports 22 options, which are listed below.

Name Description Default Type

amazonDDBClient (producer)

Autowired To use the AmazonDynamoDB as the client.

DynamoDbClient

configuration (producer)

The component configuration.

Ddb2Configuration

consistentRead (producer)

Determines whether or not strong consistency should be enforced when data is read.

false

boolean

enabledInitialDescribeTable (producer)

Set whether the initial Describe table operation in the DDB Endpoint must be done, or not.

true

boolean

keyAttributeName (producer)

Attribute name when creating table.

String

keyAttributeType (producer)

Attribute type when creating table.

String

keyScalarType (producer)

The key scalar type, it can be S (String), N (Number) and B (Bytes).

String

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

operation (producer)

What operation to perform.

Enum values:

  • BatchGetItems

  • DeleteItem

  • DeleteTable

  • DescribeTable

  • GetItem

  • PutItem

  • Query

  • Scan

  • UpdateItem

  • UpdateTable

PutItem

Ddb2Operations

overrideEndpoint (producer)

Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option.

false

boolean

proxyHost (producer)

To define a proxy host when instantiating the DDB client.

String

proxyPort (producer)

The region in which DynamoDB client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example ap-east-1) You’ll need to use the name Region.EU_WEST_1.id().

Integer

proxyProtocol (producer)

To define a proxy protocol when instantiating the DDB client.

Enum values:

  • HTTP

  • HTTPS

HTTPS

Protocol

readCapacity (producer)

The provisioned throughput to reserve for reading resources from your table.

Long

region (producer)

The region in which DDB client needs to work.

String

trustAllCertificates (producer)

If we want to trust all certificates in case of overriding the endpoint.

false

boolean

uriEndpointOverride (producer)

Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.

String

useDefaultCredentialsProvider (producer)

Set whether the S3 client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in.

false

boolean

writeCapacity (producer)

The provisioned throughput to reserved for writing resources to your table.

Long

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

accessKey (security)

Amazon AWS Access Key.

String

secretKey (security)

Amazon AWS Secret Key.

String

Endpoint Options

The AWS DynamoDB endpoint is configured using URI syntax:

aws2-ddb:tableName

with the following path and query parameters:

Path Parameters (1 parameters)

Name Description Default Type

tableName (producer)

Required The name of the table currently worked with.

String

Query Parameters (20 parameters)

Name Description Default Type

amazonDDBClient (producer)

Autowired To use the AmazonDynamoDB as the client.

DynamoDbClient

consistentRead (producer)

Determines whether or not strong consistency should be enforced when data is read.

false

boolean

enabledInitialDescribeTable (producer)

Set whether the initial Describe table operation in the DDB Endpoint must be done, or not.

true

boolean

keyAttributeName (producer)

Attribute name when creating table.

String

keyAttributeType (producer)

Attribute type when creating table.

String

keyScalarType (producer)

The key scalar type, it can be S (String), N (Number) and B (Bytes).

String

operation (producer)

What operation to perform.

Enum values:

  • BatchGetItems

  • DeleteItem

  • DeleteTable

  • DescribeTable

  • GetItem

  • PutItem

  • Query

  • Scan

  • UpdateItem

  • UpdateTable

PutItem

Ddb2Operations

overrideEndpoint (producer)

Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option.

false

boolean

proxyHost (producer)

To define a proxy host when instantiating the DDB client.

String

proxyPort (producer)

The region in which DynamoDB client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example ap-east-1) You’ll need to use the name Region.EU_WEST_1.id().

Integer

proxyProtocol (producer)

To define a proxy protocol when instantiating the DDB client.

Enum values:

  • HTTP

  • HTTPS

HTTPS

Protocol

readCapacity (producer)

The provisioned throughput to reserve for reading resources from your table.

Long

region (producer)

The region in which DDB client needs to work.

String

trustAllCertificates (producer)

If we want to trust all certificates in case of overriding the endpoint.

false

boolean

uriEndpointOverride (producer)

Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.

String

useDefaultCredentialsProvider (producer)

Set whether the S3 client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in.

false

boolean

writeCapacity (producer)

The provisioned throughput to reserved for writing resources to your table.

Long

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

accessKey (security)

Amazon AWS Access Key.

String

secretKey (security)

Amazon AWS Secret Key.

String

Required DDB component options

You have to provide the amazonDDBClient in the Registry or your accessKey and secretKey to access the Amazon’s DynamoDB.

Usage

Static credentials vs Default Credential Provider

You have the possibility of avoiding the usage of explicit static credentials, by specifying the useDefaultCredentialsProvider option and set it to true.

  • Java system properties - aws.accessKeyId and aws.secretKey

  • Environment variables - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.

  • Web Identity Token from AWS STS.

  • The shared credentials and config files.

  • Amazon ECS container credentials - loaded from the Amazon ECS if the environment variable AWS_CONTAINER_CREDENTIALS_RELATIVE_URI is set.

  • Amazon EC2 Instance profile credentials.

For more information about this you can look at AWS credentials documentation

Message Headers

The AWS DynamoDB component supports 32 message header(s), which is/are listed below:

Name Description Default Type

CamelAwsDdbAttributes (DeleteItem GetItem PutItem UpdateItem)

Constant: ATTRIBUTES

The list of attributes returned by the operation.

Map

CamelAwsDdbAttributeNames (producer)

Constant: ATTRIBUTE_NAMES

If attribute names are not specified then all attributes will be returned.

Collection

CamelAwsDdbBatchItems (producer)

Constant: BATCH_ITEMS

A map of the table name and corresponding items to get by primary key.

Map

CamelAwsDdbBatchResponse (BatchGetItems)

Constant: BATCH_RESPONSE

Table names and the respective item attributes from the tables.

Map

CamelAwsDdbConsistentRead (producer)

Constant: CONSISTENT_READ

If set to true, then a consistent read is issued, otherwise eventually consistent is used.

Boolean

CamelAwsDdbConsumedCapacity (Query Scan)

Constant: CONSUMED_CAPACITY

The number of Capacity Units of the provisioned throughput of the table consumed during the operation.

Double

CamelAwsDdbCount (Query Scan)

Constant: COUNT

Number of items in the response.

Integer

CamelAwsDdbCreationDate (DeleteTable DescribeTable)

Constant: CREATION_DATE

Creation DateTime of this table.

Date

CamelAwsDdbIndexName (producer)

Constant: INDEX_NAME

If set will be used as Secondary Index for Query operation.

String

CamelAwsDdbItem (producer)

Constant: ITEM

A map of the attributes for the item, and must include the primary key values that define the item.

Map

CamelAwsDdbItems (Query Scan)

Constant: ITEMS

The list of attributes returned by the operation.

List

CamelAwsDdbTableItemCount (DeleteTable DescribeTable)

Constant: ITEM_COUNT

Item count for this table.

Long

CamelAwsDdbKey (producer)

Constant: KEY

The primary key that uniquely identifies each item in a table.

Map

CamelAwsDdbKeyConditions (producer)

Constant: KEY_CONDITIONS

This header specify the selection criteria for the query, and merge together the two old headers CamelAwsDdbHashKeyValue and CamelAwsDdbScanRangeKeyCondition.

Map

CamelAwsDdbKeySchema (DeleteTable DescribeTable)

Constant: KEY_SCHEMA

The KeySchema that identifies the primary key for this table. From Camel 2.16.0 the type of this header is List and not KeySchema.

List

CamelAwsDdbLastEvaluatedKey (Query Scan)

Constant: LAST_EVALUATED_KEY

Primary key of the item where the query operation stopped, inclusive of the previous result set.

Key

CamelAwsDdbLimit (producer)

Constant: LIMIT

The maximum number of items to return.

Integer

CamelAwsDdbOperation (producer)

Constant: OPERATION

The operation to perform.

Enum values:

  • BatchGetItems

  • DeleteItem

  • DeleteTable

  • DescribeTable

  • GetItem

  • PutItem

  • Query

  • Scan

  • UpdateItem

  • UpdateTable

Ddb2Operations

CamelAwsDdbProvisionedThroughput (DeleteTable DescribeTable)

Constant: PROVISIONED_THROUGHPUT

The value of the ProvisionedThroughput property for this table.

ProvisionedThroughputDescription

CamelAwsDdbReadCapacity (UpdateTable DescribeTable)

Constant: READ_CAPACITY

ReadCapacityUnits property of this table.

Long

CamelAwsDdbReturnValues (producer)

Constant: RETURN_VALUES

Use this parameter if you want to get the attribute name-value pairs before or after they are modified(NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW).

String

CamelAwsDdbScannedCount (Scan)

Constant: SCANNED_COUNT

Number of items in the complete scan before any filters are applied.

Integer

CamelAwsDdbScanIndexForward (producer)

Constant: SCAN_INDEX_FORWARD

Specifies forward or backward traversal of the index.

Boolean

CamelAwsDdbScanFilter (producer)

Constant: SCAN_FILTER

Evaluates the scan results and returns only the desired values.

Map

CamelAwsDdbStartKey (producer)

Constant: START_KEY

Primary key of the item from which to continue an earlier query.

Map

CamelAwsDdbTableName (producer)

Constant: TABLE_NAME

Table Name for this operation.

String

CamelAwsDdbTableSize (DeleteTable DescribeTable)

Constant: TABLE_SIZE

The table size in bytes.

Long

CamelAwsDdbTableStatus (DeleteTable DescribeTable)

Constant: TABLE_STATUS

The status of the table: CREATING, UPDATING, DELETING, ACTIVE.

String

CamelAwsDdbUpdateCondition (producer)

Constant: UPDATE_CONDITION

Designates an attribute for a conditional modification.

Map

CamelAwsDdbUpdateValues (producer)

Constant: UPDATE_VALUES

Map of attribute name to the new value and action for the update.

Map

CamelAwsDdbUnprocessedKeys (BatchGetItems)

Constant: UNPROCESSED_KEYS

Contains a map of tables and their respective keys that were not processed with the current response.

Map

CamelAwsDdbWriteCapacity (UpdateTable DescribeTable)

Constant: WRITE_CAPACITY

WriteCapacityUnits property of this table.

Long

Advanced AmazonDynamoDB configuration

If you need more control over the AmazonDynamoDB instance configuration you can create your own instance and refer to it from the URI:

public class MyRouteBuilder extends RouteBuilder {

    private String accessKey = "myaccessKey";
    private String secretKey = "secretKey";

    @Override
    public void configure() throws Exception {

        DynamoDbClient client = DynamoDbClient.builder()
        .region(Region.AP_SOUTHEAST_2)
        .credentialsProvider(StaticCredentialsProvider.create(AwsBasicCredentials.create(accessKey, secretKey)))
        .build();

        getCamelContext().getRegistry().bind("client", client);

    	from("direct:start")
        .to("aws2-ddb://domainName?amazonDDBClient=#client");
    }
}

The #client refers to a DynamoDbClient in the Registry.

Supported producer operations

  • BatchGetItems

  • DeleteItem

  • DeleteTable

  • DescribeTable

  • GetItem

  • PutItem

  • Query

  • Scan

  • UpdateItem

  • UpdateTable

Dependencies

Examples

Producer Examples

  • PutItem: this operation will create an entry into DynamoDB

Map<String, AttributeValue> attributeMap = new HashMap<>();
attributeMap.put("partitionKey", AttributeValue.builder().s("3000").build());
attributeMap.put("id", AttributeValue.builder().s("1001").build());
attributeMap.put("barcode", AttributeValue.builder().s("9002811220001").build());

from("direct:start")
  .setHeader(Ddb2Constants.OPERATION,  constant(Ddb2Operations.PutItem))
  .setHeader(Ddb2Constants.CONSISTENT_READ, constant("true"))
  .setHeader(Ddb2Constants.RETURN_VALUES, constant("ALL_OLD"))
  .setHeader(Ddb2Constants.ITEM, constant(attributeMap))
  .setHeader(Ddb2Constants.ATTRIBUTE_NAMES, constant(attributeMap.keySet()))
  .to("aws2-ddb://" + tableName + "?amazonDDBClient=#client");

  • UpdateItem: this operation will update an entry into DynamoDB

Map<String, AttributeValueUpdate> attributeMap = new HashMap<>();
attributeMap.put("partitionKey", AttributeValueUpdate.builder().value(AttributeValue.builder().s("3000").build()).build());
attributeMap.put("sortKey",  AttributeValueUpdate.builder().value(AttributeValue.builder().s("1001").build()).build());
attributeMap.put("borcode",  AttributeValueUpdate.builder().value(AttributeValue.builder().s("900281122").build()).build());

Map<String, AttributeValue> keyMap = new HashMap<>();
keyMap.put("partitionKey", AttributeValue.builder().s("3000").build());
keyMap.put("sortKey", AttributeValue.builder().s("1001").build());

from("direct:start")
  .setHeader(Ddb2Constants.OPERATION,  constant(Ddb2Operations.UpdateItem))
  .setHeader(Ddb2Constants.ITEM,  constant(attributeMap))
  .setHeader(Ddb2Constants.KEY,  constant(keyMap))
  .to("aws2-ddb://" + tableName + "?amazonDDBClient=#client");

Maven users will need to add the following dependency to their pom.xml.

pom.xml

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws2-ddb</artifactId>
    <version>${camel-version}</version>
</dependency>

where ${camel-version} must be replaced by the actual version of Camel.