Package io.camunda.zeebe.client.impl.worker

Class JobWorkerBuilderImpl

java.lang.Object

io.camunda.zeebe.client.impl.worker.JobWorkerBuilderImpl

All Implemented Interfaces:

JobWorkerBuilderStep1, JobWorkerBuilderStep1.JobWorkerBuilderStep2, JobWorkerBuilderStep1.JobWorkerBuilderStep3

public final class JobWorkerBuilderImpl
extends Object
implements JobWorkerBuilderStep1, JobWorkerBuilderStep1.JobWorkerBuilderStep2, JobWorkerBuilderStep1.JobWorkerBuilderStep3

Nested Class Summary

Nested classes/interfaces inherited from interface io.camunda.zeebe.client.api.worker.JobWorkerBuilderStep1

JobWorkerBuilderStep1.JobWorkerBuilderStep2, JobWorkerBuilderStep1.JobWorkerBuilderStep3

Field Summary

Fields

Modifier and Type	Field	Description
static final BackoffSupplier	DEFAULT_BACKOFF_SUPPLIER

Constructor Summary

Constructors

Constructor	Description
JobWorkerBuilderImpl(ZeebeClientConfiguration configuration, GatewayGrpc.GatewayStub gatewayStub, JobClient jobClient, JsonMapper jsonMapper, ScheduledExecutorService executorService, List<Closeable> closeables, Predicate<Throwable> retryPredicate)

Method Summary

Modifier and Type	Method	Description
JobWorkerBuilderStep1.JobWorkerBuilderStep3	backoffSupplier(BackoffSupplier backoffSupplier)	Sets the backoff supplier.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	fetchVariables(String... fetchVariables)	Set a list of variable names which should be fetch on job activation.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	fetchVariables(List<String> fetchVariables)	Set a list of variable names which should be fetch on job activation.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	handler(JobHandler handler)	Set the handler to process the jobs.
JobWorkerBuilderStep1.JobWorkerBuilderStep2	jobType(String type)	Set the type of jobs to work on.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	maxJobsActive(int maxJobsActive)	Set the maximum number of jobs which will be exclusively activated for this worker at the same time.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	name(String workerName)	Set the name of the worker owner.
JobWorker	open()	Open the worker and start to work on available tasks.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	pollInterval(Duration pollInterval)	Set the maximal interval between polling for new jobs.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	requestTimeout(Duration requestTimeout)	Set the request timeout for activate job request used to poll for new job.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	timeout(long timeout)	Set the time for how long a job is exclusively assigned for this worker.
JobWorkerBuilderStep1.JobWorkerBuilderStep3	timeout(Duration timeout)	Set the time for how long a job is exclusively assigned for this worker.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_BACKOFF_SUPPLIER

public static final BackoffSupplier DEFAULT_BACKOFF_SUPPLIER

Constructor Details

JobWorkerBuilderImpl

public JobWorkerBuilderImpl(ZeebeClientConfiguration configuration,
 GatewayGrpc.GatewayStub gatewayStub,
 JobClient jobClient,
 JsonMapper jsonMapper,
 ScheduledExecutorService executorService,
 List<Closeable> closeables,
 Predicate<Throwable> retryPredicate)

Method Details

jobType

public JobWorkerBuilderStep1.JobWorkerBuilderStep2 jobType(String type)

Description copied from interface: JobWorkerBuilderStep1

Set the type of jobs to work on.

Specified by:

jobType in interface JobWorkerBuilderStep1

Parameters:

type - the type of jobs (e.g. "payment")

Returns:

the builder for this worker

handler

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 handler(JobHandler handler)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep2

Set the handler to process the jobs. At the end of the processing, the handler should complete the job or mark it as failed;

Example JobHandler implementation:

 public final class PaymentHandler implements JobHandler
 {
   @Override
   public void handle(JobClient client, JobEvent jobEvent)
   {
     String json = jobEvent.getVariables();
     // modify variables

     client
      .newCompleteCommand(jobEvent.getKey())
      .variables(json)
      .send();
   }
 };
 

The handler must be thread-safe.

Specified by:

handler in interface JobWorkerBuilderStep1.JobWorkerBuilderStep2

Parameters:

handler - the handle to process the jobs

Returns:

the builder for this worker

timeout

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 timeout(long timeout)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set the time for how long a job is exclusively assigned for this worker.

In this time, the job can not be assigned by other workers to ensure that only one worker work on the job. When the time is over then the job can be assigned again by this or other worker if it's not completed yet.

If no timeout is set, then the default is used from the configuration.

Specified by:

timeout in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

timeout - the time in milliseconds

Returns:

the builder for this worker

timeout

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 timeout(Duration timeout)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set the time for how long a job is exclusively assigned for this worker.

In this time, the job can not be assigned by other workers to ensure that only one worker work on the job. When the time is over then the job can be assigned again by this or other worker if it's not completed yet.

If no time is set then the default is used from the configuration.

Specified by:

timeout in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

timeout - the time as duration (e.g. "Duration.ofMinutes(5)")

Returns:

the builder for this worker

name

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 name(String workerName)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set the name of the worker owner.

This name is used to identify the worker to which a job is exclusively assigned to.

If no name is set then the default is used from the configuration.

Specified by:

name in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

workerName - the name of the worker (e.g. "payment-service")

Returns:

the builder for this worker

maxJobsActive

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 maxJobsActive(int maxJobsActive)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set the maximum number of jobs which will be exclusively activated for this worker at the same time.

This is used to control the backpressure of the worker. When the maximum is reached then the worker will stop activating new jobs in order to not overwhelm the client and give other workers the chance to work on the jobs. The worker will try to activate new jobs again when jobs are completed (or marked as failed).

If no maximum is set then the default, from the ZeebeClientConfiguration, is used.

Considerations:

• A greater value can avoid situations in which the client waits idle for the broker to provide more jobs. This can improve the worker's throughput.
• The memory used by the worker is linear with respect to this value.
• The job's timeout starts to run down as soon as the broker pushes the job. Keep in mind that the following must hold to ensure fluent job handling: time spent in queue + time job handler needs until job completion < job timeout

Specified by:

maxJobsActive in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

maxJobsActive - the maximum jobs active by this worker

Returns:

the builder for this worker

pollInterval

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 pollInterval(Duration pollInterval)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set the maximal interval between polling for new jobs.

A job worker will automatically try to always activate new jobs after completing jobs. If no jobs can be activated after completing the worker will periodically poll for new jobs.

If no poll interval is set then the default is used from the ZeebeClientConfiguration

Specified by:

pollInterval in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

pollInterval - the maximal interval to check for new jobs

Returns:

the builder for this worker

requestTimeout

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 requestTimeout(Duration requestTimeout)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set the request timeout for activate job request used to poll for new job.

If no request timeout is set then the default is used from the ZeebeClientConfiguration

Specified by:

requestTimeout in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

requestTimeout - the request timeout for activate jobs request

Returns:

the builder for this worker

fetchVariables

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 fetchVariables(List<String> fetchVariables)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set a list of variable names which should be fetch on job activation.

The jobs which are activated by this worker will only contain variables from this list.

This can be used to limit the number of variables of the activated jobs.

Specified by:

fetchVariables in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

fetchVariables - list of variables names to fetch on activation

Returns:

the builder for this worker

fetchVariables

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 fetchVariables(String... fetchVariables)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Set a list of variable names which should be fetch on job activation.

The jobs which are activated by this worker will only contain variables from this list.

This can be used to limit the number of variables of the activated jobs.

Specified by:

fetchVariables in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

fetchVariables - list of variables names to fetch on activation

Returns:

the builder for this worker

backoffSupplier

public JobWorkerBuilderStep1.JobWorkerBuilderStep3 backoffSupplier(BackoffSupplier backoffSupplier)

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Sets the backoff supplier. The supplier is called to determine the retry delay after each failed request; the worker then waits until the returned delay has elapsed before sending the next request. Note that this is used only for the polling mechanism - failures in the JobHandler should be handled there, and retried there if need be.

By default, the supplier uses exponential back off, with an upper bound of 5 seconds. The exponential backoff can be easily configured using BackoffSupplier.newBackoffBuilder().

Specified by:

backoffSupplier in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Parameters:

backoffSupplier - supplies the retry delay after a failed request

Returns:

the builder for this worker

open

public JobWorker open()

Description copied from interface: JobWorkerBuilderStep1.JobWorkerBuilderStep3

Open the worker and start to work on available tasks.

Specified by:

open in interface JobWorkerBuilderStep1.JobWorkerBuilderStep3

Returns:

the worker