Whether to use a Connector or an External Task in Camunda depends on the specific requirements and characteristics of your integration scenario. Here's a comparison to help you understand the differences and make an informed decision:
Connectors:
Connectors are built-in components in Camunda that provide a standardized way to integrate with external systems or services.
Connectors offer a simplified and declarative approach to interact with external systems without the need for custom code.
They allow you to define input/output parameters, configure connection details, and handle error scenarios.
Connectors support synchronous communication, where the process waits for the response from the external system before continuing.
They are suitable for simpler integration scenarios where direct interaction with external systems is required within the process flow.
Connectors are typically used when the integration logic is relatively straightforward and can be accomplished using the available connectors (e.g., REST, SOAP, JMS).
External Tasks:
External Tasks provide a more flexible and scalable approach for integrating with external systems or services.
External Tasks allow you to decouple the process engine from the external systems, enabling asynchronous communication and parallel processing.
With External Tasks, you define tasks in your BPMN model and implement worker applications that handle the execution of these tasks.
Worker applications can be developed in any programming language and provide custom logic to interact with the external systems.
External Tasks are suitable for complex integration scenarios, long-running processes, or when dealing with multiple external systems concurrently.
They support asynchronous processing, where the process engine delegates the task to the worker application and continues with the process flow.
External Tasks provide advanced features like task retries, long polling, and topic-based subscription to handle failures and distribute workloads.
In summary, you should consider using a Connector when the integration logic is relatively simple and can be accomplished using the available connectors provided by Camunda. On the other hand, if you have more complex integration requirements, asynchronous communication, or need scalability and fault tolerance, External Tasks provide a more flexible and powerful approach.
Evaluate your specific integration needs, the complexity of the integration logic, and the desired communication patterns to determine whether a Connector or an External Task is the best fit for your use case.
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