AWS Kinesis Component

Table of Contents

URI Format
URI Options
Batch Consumer
Usage
Providing AWS Credentials
Dependencies
See Also

Available as of Camel 2.17

The Kinesis component supports receiving messages from and sending messages to Amazon Kinesis service.

Prerequisites

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

URI Format

aws-kinesis://stream-name[?options]

The stream needs to be created prior to it being used. You can append query options to the URI in the following format, ?options=value&option2=value&…

URI Options

The AWS Kinesis component has no options.

The AWS Kinesis component supports 25 endpoint options which are listed below:

{% raw %}

Name	Group	Default	Java Type	Description
streamName	common		`String`	Required Name of the stream
amazonKinesisClient	common		`AmazonKinesis`	Required Amazon Kinesis client to use for all requests for this endpoint
bridgeErrorHandler	consumer	`false`	`boolean`	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/ERROR level and ignored.
iteratorType	consumer	`TRIM_HORIZON`	`ShardIteratorType`	Defines where in the Kinesis stream to start getting records
maxResultsPerRequest	consumer	`1`	`int`	Maximum number of records that will be fetched in each poll
sendEmptyMessageWhenIdle	consumer	`false`	`boolean`	If the polling consumer did not poll any files you can enable this option to send an empty message (no body) instead.
sequenceNumber	consumer		`String`	The sequence number to start polling from. Required if iteratorType is set to AFTER_SEQUENCE_NUMBER or AT_SEQUENCE_NUMBER
shardId	consumer		`String`	Defines which shardId in the Kinesis stream to get records from
exceptionHandler	consumer (advanced)		`ExceptionHandler`	To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this options is not in use. By default the consumer will deal with exceptions that will be logged at WARN/ERROR level and ignored.
exchangePattern	consumer (advanced)		`ExchangePattern`	Sets the exchange pattern when the consumer creates an exchange.
pollStrategy	consumer (advanced)		`PollingConsumerPollStrategy`	A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.
synchronous	advanced	`false`	`boolean`	Sets whether synchronous processing should be strictly used or Camel is allowed to use asynchronous processing (if supported).
backoffErrorThreshold	scheduler		`int`	The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.
backoffIdleThreshold	scheduler		`int`	The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.
backoffMultiplier	scheduler		`int`	To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.
delay	scheduler	`500`	`long`	Milliseconds before the next poll. You can also specify time values using units such as 60s (60 seconds) 5m30s (5 minutes and 30 seconds) and 1h (1 hour).
greedy	scheduler	`false`	`boolean`	If greedy is enabled then the ScheduledPollConsumer will run immediately again if the previous run polled 1 or more messages.
initialDelay	scheduler	`1000`	`long`	Milliseconds before the first poll starts. You can also specify time values using units such as 60s (60 seconds) 5m30s (5 minutes and 30 seconds) and 1h (1 hour).
runLoggingLevel	scheduler	`TRACE`	`LoggingLevel`	The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.
scheduledExecutorService	scheduler		`ScheduledExecutorService`	Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.
scheduler	scheduler	`none`	`ScheduledPollConsumerScheduler`	To use a cron scheduler from either camel-spring or camel-quartz2 component
schedulerProperties	scheduler		`Map`	To configure additional properties when using a custom scheduler or any of the Quartz2 Spring based scheduler.
startScheduler	scheduler	`true`	`boolean`	Whether the scheduler should be auto started.
timeUnit	scheduler	`MILLISECONDS`	`TimeUnit`	Time unit for initialDelay and delay options.
useFixedDelay	scheduler	`true`	`boolean`	Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.

{% endraw %}

Required Kinesis component options

You have to provide the amazonKinesisClient in the Registry with proxies and relevant credentials configured.

Batch Consumer

This component implements the Batch Consumer.

This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.

Usage

Table of Contents

Message headers set by the Kinesis consumer
AmazonKinesis configuration

Message headers set by the Kinesis consumer

Header	Type	Description
`CamelAwsKinesisSequenceNumber`	`String`	The sequence number of the record. This is represented as a String as it size is not defined by the API. If it is to be used as a numerical type then use
`CamelAwsKinesisApproximateArrivalTimestamp`	`String`	The time AWS assigned as the arrival time of the record.
`CamelAwsKinesisPartitionKey`	`String`	Identifies which shard in the stream the data record is assigned to.

AmazonKinesis configuration

You will need to create an instance of AmazonKinesisClient and bind it to the registry

ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

Region region = Region.getRegion(Regions.fromName(region));
region.createClient(AmazonKinesisClient.class, null, clientConfiguration);
// the 'null' here is the AWSCredentialsProvider which defaults to an instance of DefaultAWSCredentialsProviderChain

registry.bind("kinesisClient", client);

You then have to reference the AmazonKinesisClient in the amazonKinesisClient URI option.

from("aws-kinesis://mykinesisstream?amazonKinesisClient=#kinesisClient")
  .to("log:out?showAll=true");

Providing AWS Credentials

It is recommended that the credentials are obtained by using the DefaultAWSCredentialsProviderChain that is the default when creating a new ClientConfiguration instance, however, a different AWSCredentialsProvider can be specified when calling createClient(…).

Message headers used by the Kinesis producer to write to Kinesis. The producer expects that the message body is a ByteBuffer.

Header	Type	Description
`CamelAwsKinesisPartitionKey`	`String`	The PartitionKey to pass to Kinesis to store this record.
`CamelAwsKinesisSequenceNumber`	`String`	Optional paramter to indicate the sequence number of this record.

Message headers set by the Kinesis producer on successful storage of a Record

Header	Type	Description
`CamelAwsKinesisSequenceNumber`	`String`	The sequence number of the record, as defined in Response Syntax
`CamelAwsKinesisShardId`	`String`	The shard ID of where the Record was stored

Dependencies

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

pom.xml

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

where ${camel-version} must be replaced by the actual version of Camel (2.17 or higher).