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Chapter 60. Predicate Filter Action

Filter based on a JSONPath Expression. Since this is a filter, the expression is a negation. This means that if the foo field of the example is equal to John, the message goes ahead. Otherwise it is filtered out.

60.1. Configuration Options
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The following table summarizes the configuration options available for the predicate-filter-action Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

expression *

Expression

The JSONPath Expression to evaluate, without the external parenthesis. Since this is a filter, the expression is a negation. This means that if the foo field of the example is equal to John, the message goes ahead. Otherwise it is filtered out.

string

 

@.foo =~ /.*John/

* = Fields marked with an asterisk are mandatory.

60.2. Dependencies
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60.2.1. Quarkus dependencies
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<dependencies>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-core</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-jsonpath</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifact>camel-quarkus-kamelet</artifact>
  </dependency>
  <dependency>
    <groupId>org.apache.camel.kamelets</groupId>
    <artifact>camel-kamelets-utils</artifact>
    <version>4.8.5</version>
  </dependency>
</dependencies>
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60.3. Usage
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60.3.1. Camel JBang usage
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60.3.1.1. Prerequisites for JBang
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  • Install JBang.

  • You have executed the following command: 

    jbang app install camel@apache/camel
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60.3.1.2. 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"
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You can now run it directly through the following command. 

camel run route.yaml
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60.3.2. Knative Action
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You can use the predicate-filter-action Kamelet as an intermediate step in a Knative binding.

predicate-filter-action-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: predicate-filter-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: predicate-filter-action
    properties:
      expression: "@.foo =~ /.*John/"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
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60.3.3. Kafka Action
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You can use the predicate-filter-action Kamelet as an intermediate step in a Kafka binding.

predicate-filter-action-binding.yaml

apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
  name: predicate-filter-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: predicate-filter-action
    properties:
      expression: "@.foo =~ /.*John/"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
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60.4. Kamelets source file
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https://github.com/jboss-fuse/camel-kamelets/blob/camel-kamelets-4.10.3-branch/kamelets/predicate-filter-action.kamelet.yaml

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