| // THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT |
| = image:kamelets/predicate-filter-action.svg[] Predicate Filter Action |
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| *Provided by: "Apache Software Foundation"* |
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| *Support Level for this Kamelet is: "Preview"* |
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| Filter based on a JsonPath Expression |
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| == Configuration Options |
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| The following table summarizes the configuration options available for the `predicate-filter-action` Kamelet: |
| [width="100%",cols="2,^2,3,^2,^2,^3",options="header"] |
| |=== |
| | Property| Name| Description| Type| Default| Example |
| | *expression {empty}* *| Expression| The JsonPath Expression to evaluate, without the external parenthesis. Since this is a filter, the expression will be a negation, this means that if the foo field of the example is equals to John, the message will go ahead, otherwise it will be filtered out.| string| | `"@.foo =~ /.*John/"` |
| |=== |
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| NOTE: Fields marked with ({empty}*) are mandatory. |
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| == Usage |
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| This section summarizes how the `predicate-filter-action` can be used in various contexts. |
| |
| === Knative Action |
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| The `predicate-filter-action` Kamelet can be used as intermediate step in a Knative binding. |
| |
| .predicate-filter-action-binding.yaml |
| [source,yaml] |
| ---- |
| apiVersion: camel.apache.org/v1alpha1 |
| kind: KameletBinding |
| metadata: |
| name: predicate-filter-action-binding |
| spec: |
| source: |
| ref: |
| kind: Kamelet |
| apiVersion: camel.apache.org/v1alpha1 |
| name: timer-source |
| properties: |
| message: "Hello" |
| steps: |
| - ref: |
| kind: Kamelet |
| apiVersion: camel.apache.org/v1alpha1 |
| name: predicate-filter-action |
| properties: |
| expression: "@.foo =~ /.*John/" |
| sink: |
| ref: |
| kind: InMemoryChannel |
| apiVersion: messaging.knative.dev/v1 |
| name: mychannel |
| |
| ---- |
| Make sure you have xref:latest@camel-k::installation/installation.adoc[Camel K installed] into the Kubernetes cluster you're connected to. |
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| Save the `predicate-filter-action-binding.yaml` file into your hard drive, then configure it according to your needs. |
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| You can run the action using the following command: |
| |
| [source,shell] |
| ---- |
| kubectl apply -f predicate-filter-action-binding.yaml |
| ---- |
| |
| ==== *Dependencies* |
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| The Kamelet needs the following dependencies: |
| |
| - camel:core |
| - camel:kamelet |
| - camel:jsonpath |
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| ==== *Binding to Knative using the Kamel CLI:* |
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| The procedure described above can be simplified into a single execution of the `kamel bind` command: |
| |
| [source,shell] |
| ---- |
| kamel bind timer-source?message=Hello --step predicate-filter-action -p "step-0.expression=@.foo =~ /.*John/" channel:mychannel |
| ---- |
| |
| This will create the KameletBinding under the hood and apply it to the current namespace in the cluster. |
| |
| === Kafka Action |
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| The `predicate-filter-action` Kamelet can be used as intermediate step in a Kafka binding. |
| |
| .predicate-filter-action-binding.yaml |
| [source,yaml] |
| ---- |
| apiVersion: camel.apache.org/v1alpha1 |
| kind: KameletBinding |
| metadata: |
| name: predicate-filter-action-binding |
| spec: |
| source: |
| ref: |
| kind: Kamelet |
| apiVersion: camel.apache.org/v1alpha1 |
| name: timer-source |
| properties: |
| message: "Hello" |
| steps: |
| - ref: |
| kind: Kamelet |
| apiVersion: camel.apache.org/v1alpha1 |
| name: predicate-filter-action |
| properties: |
| expression: "@.foo =~ /.*John/" |
| sink: |
| ref: |
| kind: KafkaTopic |
| apiVersion: kafka.strimzi.io/v1beta1 |
| name: my-topic |
| |
| ---- |
| |
| Ensure that you've installed https://strimzi.io/[Strimzi] and created a topic named `my-topic` in the current namespace. |
| Make also sure you have xref:latest@camel-k::installation/installation.adoc[Camel K installed] into the Kubernetes cluster you're connected to. |
| |
| Save the `predicate-filter-action-binding.yaml` file into your hard drive, then configure it according to your needs. |
| |
| You can run the action using the following command: |
| |
| [source,shell] |
| ---- |
| kubectl apply -f predicate-filter-action-binding.yaml |
| ---- |
| |
| ==== *Binding to Kafka using the Kamel CLI:* |
| |
| The procedure described above can be simplified into a single execution of the `kamel bind` command: |
| |
| [source,shell] |
| ---- |
| kamel bind timer-source?message=Hello --step predicate-filter-action -p "step-0.expression=@.foo =~ /.*John/" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic |
| ---- |
| |
| This will create the KameletBinding under the hood and apply it to the current namespace in the cluster. |
| |
| ==== Kamelet source file |
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| Have a look at the following link: |
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| https://github.com/apache/camel-kamelets/blob/main/predicate-filter-action.kamelet.yaml |
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| // THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT |