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Java SDK

Conductor provides the following java clients to interact with the various APIs

Client Usage
Metadata Client Register / Update workflow and task definitions
Workflow Client Start a new workflow / Get execution status of a workflow
Task Client Poll for task / Update task result after execution / Get status of a task


Conductor provides an automated framework to poll for tasks, manage the execution thread and update the status of the execution back to the server.

Implement the Worker interface to execute the task.


The TaskRunnerConfigurer can be used to register the worker(s) and initialize the polling loop.
Manages the task workers thread pool and server communication (poll and task update).

Use the Builder to create an instance of the TaskRunnerConfigurer. The Builder constructor takes the following parameters.

Parameter Description
TaskClient TaskClient used to communicate to the Conductor server
Workers Workers that will be used for polling work and task execution.

The builder accepts the following parameters:

Parameter Description Default
withEurekaClient EurekaClient is used to identify if the server is in discovery or not. When the server goes out of discovery, the polling is stopped unless pollOutOfDiscovery is set to true. If passed null, discovery check is not done. provided by platform
withThreadCount Number of threads assigned to the workers. Should be at-least the size of taskWorkers to avoid starvation in a busy system. Number of registered workers
withSleepWhenRetry Time in milliseconds, for which the thread should sleep when task update call fails, before retrying the operation. 500
withUpdateRetryCount Number of attempts to be made when updating task status when update status call fails. 3
withWorkerNamePrefix String prefix that will be used for all the workers. workflow-worker-
withShutdownGracePeriodSeconds Waiting seconds before forcing shutdown of your worker 10

Once an instance is created, call init() method to initialize the TaskPollExecutor and begin the polling and execution of tasks.


To ensure that the TaskRunnerConfigurer stops polling for tasks when the instance becomes unhealthy, call the provided shutdown() hook in a PreDestroy block.


The worker behavior can be further controlled by using these properties:

Property Type Description Default
paused boolean If set to true, the worker stops polling. false
pollInterval int Interval in milliseconds at which the server should be polled for tasks. 1000
pollOutOfDiscovery boolean If set to true, the instance will poll for tasks regardless of the discovery
status. This is useful while running on a dev machine.

Further, these properties can be set either by Worker implementation or by setting the following system properties in the JVM:

Name Description
conductor.worker.<property> Applies to ALL the workers in the JVM.
conductor.worker.<taskDefName>.<property> Applies to the specified worker. Overrides the global property.