Chapter 3. AWS DynamoDB

Only producer is supported

The AWS2 DynamoDB component supports storing and retrieving data from/to 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.

3.1. URI Format

aws2-ddb://domainName[?options]

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

3.2. Configuring Options

Camel components are configured on two separate levels:

component level
endpoint level

3.2.1. 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.

3.2.2. 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.

3.3. 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

3.4. Endpoint Options

The AWS DynamoDB endpoint is configured using URI syntax:

aws2-ddb:tableName

with the following path and query parameters:

3.4.1. Path Parameters (1 parameters)

Name	Description	Default	Type
tableName (producer)	Required The name of the table currently worked with.		String

3.4.2. 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
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
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.

3.5. Usage

3.5.1. 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

3.5.2. Message headers evaluated by the DDB producer

Header	Type	Description
`CamelAwsDdbBatchItems`	`Map<String, KeysAndAttributes>`	A map of the table name and corresponding items to get by primary key.
`CamelAwsDdbTableName`	`String`	Table Name for this operation.
`CamelAwsDdbKey`	`Key`	The primary key that uniquely identifies each item in a table.
`CamelAwsDdbReturnValues`	`String`	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).
`CamelAwsDdbUpdateCondition`	`Map<String, ExpectedAttributeValue>`	Designates an attribute for a conditional modification.
`CamelAwsDdbAttributeNames`	`Collection<String>`	If attribute names are not specified then all attributes will be returned.
`CamelAwsDdbConsistentRead`	`Boolean`	If set to true, then a consistent read is issued, otherwise eventually consistent is used.
`CamelAwsDdbIndexName`	`String`	If set will be used as Secondary Index for Query operation.
`CamelAwsDdbItem`	`Map<String, AttributeValue>`	A map of the attributes for the item, and must include the primary key values that define the item.
`CamelAwsDdbExactCount`	`Boolean`	If set to true, Amazon DynamoDB returns a total number of items that match the query parameters, instead of a list of the matching items and their attributes.
`CamelAwsDdbKeyConditions`	`Map<String, Condition>`	This header specify the selection criteria for the query, and merge together the two old headers CamelAwsDdbHashKeyValue and CamelAwsDdbScanRangeKeyCondition
`CamelAwsDdbStartKey`	`Key`	Primary key of the item from which to continue an earlier query.
`CamelAwsDdbHashKeyValue`	`AttributeValue`	Value of the hash component of the composite primary key.
`CamelAwsDdbLimit`	`Integer`	The maximum number of items to return.
`CamelAwsDdbScanRangeKeyCondition`	`Condition`	A container for the attribute values and comparison operators to use for the query.
`CamelAwsDdbScanIndexForward`	`Boolean`	Specifies forward or backward traversal of the index.
`CamelAwsDdbScanFilter`	`Map<String, Condition>`	Evaluates the scan results and returns only the desired values.
`CamelAwsDdbUpdateValues`	`Map<String, AttributeValueUpdate>`	Map of attribute name to the new value and action for the update.

3.5.3. Message headers set during BatchGetItems operation

Header	Type	Description
`CamelAwsDdbBatchResponse`	`Map<String,BatchResponse>`	Table names and the respective item attributes from the tables.
`CamelAwsDdbUnprocessedKeys`	`Map<String,KeysAndAttributes>`	Contains a map of tables and their respective keys that were not processed with the current response.

3.5.4. Message headers set during DeleteItem operation

Header	Type	Description
`CamelAwsDdbAttributes`	`Map<String, AttributeValue>`	The list of attributes returned by the operation.

3.5.5. Message headers set during DeleteTable operation

Header	Type	Description
`CamelAwsDdbProvisionedThroughput`
`ProvisionedThroughputDescription`		The value of the ProvisionedThroughput property for this table
`CamelAwsDdbCreationDate`	`Date`	Creation DateTime of this table.
`CamelAwsDdbTableItemCount`	`Long`	Item count for this table.
`CamelAwsDdbKeySchema`	`KeySchema`	The KeySchema that identifies the primary key for this table. From Camel 2.16.0 the type of this header is List<KeySchemaElement> and not KeySchema
`CamelAwsDdbTableName`	`String`	The table name.
`CamelAwsDdbTableSize`	`Long`	The table size in bytes.
`CamelAwsDdbTableStatus`	`String`	The status of the table: CREATING, UPDATING, DELETING, ACTIVE

3.5.6. Message headers set during DescribeTable operation

Header	Type	Description
`CamelAwsDdbProvisionedThroughput`	\{{ProvisionedThroughputDescription}}	The value of the ProvisionedThroughput property for this table
`CamelAwsDdbCreationDate`	`Date`	Creation DateTime of this table.
`CamelAwsDdbTableItemCount`	`Long`	Item count for this table.
`CamelAwsDdbKeySchema`	\{{KeySchema}}	The KeySchema that identifies the primary key for this table.
`CamelAwsDdbTableName`	`String`	The table name.
`CamelAwsDdbTableSize`	`Long`	The table size in bytes.
`CamelAwsDdbTableStatus`	`String`	The status of the table: CREATING, UPDATING, DELETING, ACTIVE
`CamelAwsDdbReadCapacity`	`Long`	ReadCapacityUnits property of this table.
`CamelAwsDdbWriteCapacity`	`Long`	WriteCapacityUnits property of this table.

3.5.7. Message headers set during GetItem operation

Header	Type	Description
`CamelAwsDdbAttributes`	`Map<String, AttributeValue>`	The list of attributes returned by the operation.

3.5.8. Message headers set during PutItem operation

Header	Type	Description
`CamelAwsDdbAttributes`	`Map<String, AttributeValue>`	The list of attributes returned by the operation.

3.5.9. Message headers set during Query operation

Header	Type	Description
`CamelAwsDdbItems`	`List<java.util.Map<String,AttributeValue>>`	The list of attributes returned by the operation.
`CamelAwsDdbLastEvaluatedKey`	`Key`	Primary key of the item where the query operation stopped, inclusive of the previous result set.
`CamelAwsDdbConsumedCapacity`	`Double`	The number of Capacity Units of the provisioned throughput of the table consumed during the operation.
`CamelAwsDdbCount`	`Integer`	Number of items in the response.

3.5.10. Message headers set during Scan operation

Header	Type	Description
`CamelAwsDdbItems`	`List<java.util.Map<String,AttributeValue>>`	The list of attributes returned by the operation.
`CamelAwsDdbLastEvaluatedKey`	`Key`	Primary key of the item where the query operation stopped, inclusive of the previous result set.
`CamelAwsDdbConsumedCapacity`	`Double`	The number of Capacity Units of the provisioned throughput of the table consumed during the operation.
`CamelAwsDdbCount`	`Integer`	Number of items in the response.
`CamelAwsDdbScannedCount`	`Integer`	Number of items in the complete scan before any filters are applied.

3.5.11. Message headers set during UpdateItem operation

Header	Type	Description
`CamelAwsDdbAttributes`	`Map<String, AttributeValue>`	The list of attributes returned by the operation.

3.5.12. 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:

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

The #client refers to a DynamoDbClient in the Registry.

3.6. Supported producer operations

BatchGetItems
DeleteItem
DeleteTable
DescribeTable
GetItem
PutItem
Query
Scan
UpdateItem
UpdateTable

3.7. Examples

3.7.1. Producer Examples

PutItem: this operation will create an entry into DynamoDB

from("direct:start")
  .setHeader(Ddb2Constants.OPERATION, Ddb2Operations.PutItem)
  .setHeader(Ddb2Constants.CONSISTENT_READ, "true")
  .setHeader(Ddb2Constants.RETURN_VALUES, "ALL_OLD")
  .setHeader(Ddb2Constants.ITEM, attributeMap)
  .setHeader(Ddb2Constants.ATTRIBUTE_NAMES, attributeMap.keySet());
  .to("aws2-ddb://" + tableName + "?keyAttributeName=" + attributeName + "&keyAttributeType=" + KeyType.HASH
  + "&keyScalarType=" + ScalarAttributeType.S
  + "&readCapacity=1&writeCapacity=1");

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 3.18.3 must be replaced by the actual version of Camel.

3.8. Spring Boot Auto-Configuration

When using aws2-ddb with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-aws2-ddb-starter</artifactId>
</dependency>

The component supports 40 options, which are listed below.

Name	Description	Default	Type
camel.component.aws2-ddb.access-key	Amazon AWS Access Key.		String
camel.component.aws2-ddb.amazon-d-d-b-client	To use the AmazonDynamoDB as the client. The option is a software.amazon.awssdk.services.dynamodb.DynamoDbClient type.		DynamoDbClient
camel.component.aws2-ddb.autowired-enabled	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
camel.component.aws2-ddb.configuration	The component configuration. The option is a org.apache.camel.component.aws2.ddb.Ddb2Configuration type.		Ddb2Configuration
camel.component.aws2-ddb.consistent-read	Determines whether or not strong consistency should be enforced when data is read.	false	Boolean
camel.component.aws2-ddb.enabled	Whether to enable auto configuration of the aws2-ddb component. This is enabled by default.		Boolean
camel.component.aws2-ddb.enabled-initial-describe-table	Set whether the initial Describe table operation in the DDB Endpoint must be done, or not.	true	Boolean
camel.component.aws2-ddb.key-attribute-name	Attribute name when creating table.		String
camel.component.aws2-ddb.key-attribute-type	Attribute type when creating table.		String
camel.component.aws2-ddb.key-scalar-type	The key scalar type, it can be S (String), N (Number) and B (Bytes).		String
camel.component.aws2-ddb.lazy-start-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
camel.component.aws2-ddb.operation	What operation to perform.		Ddb2Operations
camel.component.aws2-ddb.override-endpoint	Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option.	false	Boolean
camel.component.aws2-ddb.proxy-host	To define a proxy host when instantiating the DDB client.		String
camel.component.aws2-ddb.proxy-port	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
camel.component.aws2-ddb.proxy-protocol	To define a proxy protocol when instantiating the DDB client.		Protocol
camel.component.aws2-ddb.read-capacity	The provisioned throughput to reserve for reading resources from your table.		Long
camel.component.aws2-ddb.region	The region in which DDB client needs to work.		String
camel.component.aws2-ddb.secret-key	Amazon AWS Secret Key.		String
camel.component.aws2-ddb.trust-all-certificates	If we want to trust all certificates in case of overriding the endpoint.	false	Boolean
camel.component.aws2-ddb.uri-endpoint-override	Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.		String
camel.component.aws2-ddb.use-default-credentials-provider	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
camel.component.aws2-ddb.write-capacity	The provisioned throughput to reserved for writing resources to your table.		Long
camel.component.aws2-ddbstream.access-key	Amazon AWS Access Key.		String
camel.component.aws2-ddbstream.amazon-dynamo-db-streams-client	Amazon DynamoDB client to use for all requests for this endpoint. The option is a software.amazon.awssdk.services.dynamodb.streams.DynamoDbStreamsClient type.		DynamoDbStreamsClient
camel.component.aws2-ddbstream.autowired-enabled	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
camel.component.aws2-ddbstream.bridge-error-handler	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.	false	Boolean
camel.component.aws2-ddbstream.configuration	The component configuration. The option is a org.apache.camel.component.aws2.ddbstream.Ddb2StreamConfiguration type.		Ddb2StreamConfiguration
camel.component.aws2-ddbstream.enabled	Whether to enable auto configuration of the aws2-ddbstream component. This is enabled by default.		Boolean
camel.component.aws2-ddbstream.max-results-per-request	Maximum number of records that will be fetched in each poll.		Integer
camel.component.aws2-ddbstream.override-endpoint	Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option.	false	Boolean
camel.component.aws2-ddbstream.proxy-host	To define a proxy host when instantiating the DDBStreams client.		String
camel.component.aws2-ddbstream.proxy-port	To define a proxy port when instantiating the DDBStreams client.		Integer
camel.component.aws2-ddbstream.proxy-protocol	To define a proxy protocol when instantiating the DDBStreams client.		Protocol
camel.component.aws2-ddbstream.region	The region in which DDBStreams client needs to work.		String
camel.component.aws2-ddbstream.secret-key	Amazon AWS Secret Key.		String
camel.component.aws2-ddbstream.stream-iterator-type	Defines where in the DynamoDB stream to start getting records. Note that using FROM_START can cause a significant delay before the stream has caught up to real-time.		Ddb2StreamConfiguration$StreamIteratorType
camel.component.aws2-ddbstream.trust-all-certificates	If we want to trust all certificates in case of overriding the endpoint.	false	Boolean
camel.component.aws2-ddbstream.uri-endpoint-override	Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.		String
camel.component.aws2-ddbstream.use-default-credentials-provider	Set whether the DynamoDB Streams client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in.	false	Boolean