= AWS Kinesis Component
:doctitle: AWS Kinesis
:shortname: aws2-kinesis
:artifactid: camel-aws2-kinesis
:description: Consume and produce records from and to AWS Kinesis Streams.
:since: 3.2
:supportlevel: Stable
:tabs-sync-option:
:component-header: Both producer and consumer are supported
//Manually maintained attributes
:group: AWS
:camel-spring-boot-name: aws2-kinesis

*Since Camel {since}*

*{component-header}*

The AWS2 Kinesis component supports consuming messages from and producing messages to Amazon Kinesis service.

The AWS2 Kinesis component also supports Synchronous and Asynchronous Client, which means you choose what fits best your requirements,
so if you need the connection (client) to be async, there's a property of 'asyncClient' (in DSL also can be found) needs to be turned true.

Prerequisites

You must have a valid Amazon Web Services developer account, and be
signed up to use Amazon Kinesis. More information is available
at https://aws.amazon.com/kinesis/[AWS Kinesis]


== URI Format

-----------------------------------
aws2-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&...`


// component options: START
include::partial$component-configure-options.adoc[]
include::partial$component-endpoint-options.adoc[]
include::partial$component-endpoint-headers.adoc[]
// component options: END

Required Kinesis component options

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

== Usage

=== Batch Consumer

This component implements the Batch Consumer.

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

The consumer is able to consume either from a single specific shard or
all available shards (multiple shards consumption) of Amazon Kinesis, therefore, if you leave the 'shardId'
property in the DSL configuration empty, then it'll consume all available shards
otherwise only the specified shard corresponding to the shardId will be consumed.

=== Batch Producer

This component implements the Batch Producer.

This allows you to send multiple messages in a single request to Amazon Kinesis.
Messages with batch size more than 500 is allowed. Producer will split them into multiple requests.

The batch type needs to implement the `Iterable` interface. For example, it can be a `List`, `Set` or any other collection type.
The message type can be one or more of types `byte[]`, `ByteBuffer`, UTF-8 `String`, or `InputStream`. Other types are not supported.


=== Static credentials, Default Credential Provider and Profile Credentials Provider

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

The order of evaluation for Default Credentials Provider is the following:

- Java system properties - `aws.accessKeyId` and `aws.secretAccessKey`.
- 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.

You have also the possibility of using Profile Credentials Provider, by specifying the useProfileCredentialsProvider option to true and profileCredentialsName to the profile name.

Only one of static, default and profile credentials could be used at the same time.

For more information about this you can look at https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html[AWS credentials documentation]

=== AmazonKinesis configuration

You then have to reference the KinesisClient in the `amazonKinesisClient` URI option.

[source,java]
--------------------------------------------------------------------------------------------------------------------
from("aws2-kinesis://mykinesisstream?amazonKinesisClient=#kinesisClient")
  .to("log:out?showAll=true");
--------------------------------------------------------------------------------------------------------------------

=== Providing AWS Credentials

It is recommended that the credentials are obtained by using the
http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.html[DefaultAWSCredentialsProviderChain]
that is the default when creating a new ClientConfiguration instance,
however, a
different http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/AWSCredentialsProvider.html[AWSCredentialsProvider]
can be specified when calling createClient(...).

=== AWS Kinesis KCL Consumer

The component supports also the KCL (Kinesis Client Library) for consuming from a Kinesis Data Stream.

To enable this feature you'll need to set three different parameter in your endpoint and set the region:

[source,java]
--------------------------------------------------------------------------------------------------------------------
from("aws2-kinesis://mykinesisstream?asyncClient=true&useDefaultCredentialsProvider=true&useKclConsumers=true&region=myregion")
  .to("log:out?showAll=true");
--------------------------------------------------------------------------------------------------------------------

This feature will make possible to automatically checkpointing the Shard Iterations by combining the usage of KCL, DynamoDB Table and CloudWatch alarms.

Everything will work out of the box, by simply using your AWS Credentials.

NOTE: In the beginning the consumer will require 60/70 seconds for preparing everything, listing the shards, creating/querying the Lease table on Dynamo DB. Keep it in mind while working with the KCL consumer.

== Dependencies

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

*pom.xml*

[source,xml]
---------------------------------------
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws2-kinesis</artifactId>
    <version>${camel-version}</version>
</dependency>
---------------------------------------

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



include::spring-boot:partial$starter.adoc[]
