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Chapter 19. Cassandra Source

Send a query to an Apache Cassandra cluster table.

19.1. Configuration Options
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The following table summarizes the configuration options available for the cassandra-source Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

connectionHost *

Connection Host

The hostname(s) for the Cassandra server(s). Use a comma to separate multiple hostnames.

string

 

localhost

connectionPort *

Connection Port

The port number(s) of the cassandra server(s). Use a comma to separate multiple port numbers.

string

 

9042

keyspace *

Keyspace

The keyspace to use.

string

 

customers

query *

Query

The query to execute against the Cassandra cluster table.

string

  

consistencyLevel

Consistency Level

The consistency level to use.

string

QUORUM

 

extraTypeCodecs

Extra Type Codecs

To use a specific comma separated list of Extra Type codecs.

string

  

password

Password

The password for accessing a secured Cassandra cluster.

string

  

resultStrategy

Result Strategy

The strategy to convert the result set of the query.

string

ALL

 

username

Username

The username for accessing a secured Cassandra cluster.

string

  

* = Fields marked with an asterisk are mandatory.

19.2. Dependencies
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19.2.1. Quarkus dependencies
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<dependencies>
  <dependency>
    <groupId>org.apache.camel.kamelets</groupId>
    <artifactId>camel-kamelets-utils</artifactId>
    <version>4.8.5</version>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-cassandraql-ddb</artifactId>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-jackson</artifactId>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-kamelet</artifactId>
  </dependency>
</dependencies>

19.3. Usage
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19.3.1. Camel JBang usage
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19.3.1.1. Prerequisites for JBang
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  • Install JBang.

  • You have executed the following command: 

    jbang app install camel@apache/camel

19.3.1.2. Running a route with JBang
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Suppose you have a file named route.yaml with this content: 

- route:
    from:
      uri: "kamelet:timer-source"
      parameters:
        period: 10000
        message: 'test'
      steps:
        - to:
            uri: "kamelet:log-sink"

You can now run it directly through the following command. 

camel run route.yaml

19.3.2. Knative Source
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You can use the cassandra-source Kamelet as a Knative source by binding it to a Knative object.

cassandra-source-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: cassandra-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: cassandra-source
    properties:
      connectionHost: "localhost"
      connectionPort: 9042
      keyspace: "customers"
      password: "The Password"
      query: "The Query"
      username: "The Username"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

19.3.3. Kafka Source
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You can use the cassandra-source Kamelet as a Kafka source by binding it to a Kafka topic.

cassandra-source-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: cassandra-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: cassandra-source
    properties:
      connectionHost: "localhost"
      connectionPort: 9042
      keyspace: "customers"
      password: "The Password"
      query: "The Query"
      username: "The Username"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

19.4. Kamelets source file
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https://github.com/jboss-fuse/camel-kamelets/blob/camel-kamelets-4.10.3-branch/kamelets/cassandra-source.kamelet.yaml

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