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Zeebe JobWorker binding spec

Detailed documentation on the Zeebe JobWorker binding component

Component format

To setup Zeebe JobWorker binding create a component of type bindings.zeebe.jobworker. See this guide on how to create and apply a binding configuration.

See this for Zeebe JobWorker documentation.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
  namespace: <NAMESPACE>
spec:
  type: bindings.zeebe.jobworker
  version: v1
  metadata:
  - name: gatewayAddr
    value: <host>:<port>
  - name: gatewayKeepAlive
    value: 45s
  - name: usePlainTextConnection
    value: true
  - name: caCertificatePath
    value: /path/to/ca-cert
  - name: workerName
    value: products-worker
  - name: workerTimeout
    value: 5m
  - name: requestTimeout
    value: 15s
  - name: jobType
    value: fetch-products
  - name: maxJobsActive
    value: 32
  - name: concurrency
    value: 4
  - name: pollInterval
    value: 100ms
  - name: pollThreshold
    value: 0.3
  - name: fetchVariables
    value: productId, productName, productKey

Spec metadata fields

Field Required Binding support Details Example
gatewayAddr Y Input Zeebe gateway address localhost:26500
gatewayKeepAlive N Input Sets how often keep alive messages should be sent to the gateway. Defaults to 45 seconds 45s
usePlainTextConnection N Input Whether to use a plain text connection or not true,false
caCertificatePath N Input The path to the CA cert /path/to/ca-cert
workerName N Input The name of the worker activating the jobs, mostly used for logging purposes products-worker
workerTimeout N Input A job returned after this call will not be activated by another call until the timeout has been reached; defaults to 5 minutes 5m
requestTimeout N Input The request will be completed when at least one job is activated or after the requestTimeout. If the requestTimeout = 0, a default timeout is used. If the requestTimeout < 0, long polling is disabled and the request is completed immediately, even when no job is activated. Defaults to 10 seconds 30s
jobType Y Input the job type, as defined in the BPMN process (e.g. <zeebe:taskDefinition type="fetch-products" />) fetch-products
maxJobsActive N Input Set the maximum number of jobs which will be activated for this worker at the same time. Defaults to 32 32
concurrency N Input The maximum number of concurrent spawned goroutines to complete jobs. Defaults to 4 4
pollInterval N Input Set the maximal interval between polling for new jobs. Defaults to 100 milliseconds 100ms
pollThreshold N Input Set the threshold of buffered activated jobs before polling for new jobs, i.e. threshold * maxJobsActive. Defaults to 0.3 0.3
fetchVariables N Input A list of variables to fetch as the job variables; if empty, all visible variables at the time of activation for the scope of the job will be returned productId, productName, productKey

Binding support

This component supports input binding interfaces.

Input binding

Variables

The Zeebe process engine handles the process state as also process variables which can be passed on process instantiation or which can be updated or created during process execution. These variables can be passed to a registered job worker by defining the variable names as comma-separated list in the fetchVariables metadata field. The process engine will then pass these variables with its current values to the job worker implementation.

If the binding will register three variables productId, productName and productKey then the worker will be called with the following JSON body:

{
  "productId": "some-product-id",
  "productName": "some-product-name",
  "productKey": "some-product-key"
}

Note: if the fetchVariables metadata field will not be passed, all process variables will be passed to the worker.

Headers

The Zeebe process engine has the ability to pass custom task headers to a job worker. These headers can be defined for every service task. Task headers will be passed by the binding as metadata (HTTP headers) to the job worker.

The binding will also pass the following job related variables as metadata. The values will be passed as string. The table contains also the original data type so that it can be converted back to the equivalent data type in the used programming language for the worker.

Metadata Data type Description
X-Zeebe-Job-Key int64 The key, a unique identifier for the job
X-Zeebe-Job-Type string The type of the job (should match what was requested)
X-Zeebe-Process-Instance-Key int64 The job’s process instance key
X-Zeebe-Bpmn-Process-Id string The bpmn process ID of the job process definition
X-Zeebe-Process-Definition-Version int32 The version of the job process definition
X-Zeebe-Process-Definition-Key int64 The key of the job process definition
X-Zeebe-Element-Id string The associated task element ID
X-Zeebe-Element-Instance-Key int64 The unique key identifying the associated task, unique within the scope of the process instance
X-Zeebe-Worker string The name of the worker which activated this job
X-Zeebe-Retries int32 The amount of retries left to this job (should always be positive)
X-Zeebe-Deadline int64 When the job can be activated again, sent as a UNIX epoch timestamp

Last modified November 18, 2021 : Merge pull request #1978 from tanvigour/v1.4 (85161cd)