What are the different types of Logic Controllers in JMeter?

Controllers

In JMeter, Controllers are elements that enable us to organize and control the flow of tests. They are crucial for creating dynamic and realistic test scenarios, managing the order of execution, and regulating how requests are sent to the target system.

Types of controllers

JMeter is divided into two types of Controllers:

• Samplers: They instruct JMeter to send requests to a server and then wait for a response.

• Logic controllers: They allow us to customize the logic used by JMeter to determine when to send requests. They have the ability to alter the sequence of requests from their child elements, modify the requests, and prompt JMeter to repeat requests.

Let’s discuss some of the built-in Logic Controllers in JMeter.

Types of logic controllers

Following are some logic controllers in JMeter:

• Simple controller: It is a basic container that helps us group Samplers, Logic Controllers, and others for organization and clarity.

• Transaction controller: It groups a set of Samplers into a single transaction, making it easier to measure response times for related requests.

• If controller: It allows us to add conditional logic to our test plan. Child elements are executed based on a specified condition.

• Switch controller: It selects a child element based on a switch value.

• While controller: It repeats the execution of its children as long as a specific condition holds.

• Loop controller: It repeats the execution of its child elements for a specified number of times or indefinitely, allowing for various iterations of our test.

• Random controller: It randomly selects and executes one of its child elements during each iteration, introducing unpredictability to our tests.

• Recording controller: It is used to store and organize recorded requests when using JMeter’s HTTP(S) test script recorder.

• Module controller: It enables the reuse of elements within our test plan as modules, promoting modularity and reusability.

• Runtime controller: It allows us to set a runtime duration for a group of Samplers or Controllers. It executes its children until the specified duration is reached.

Conclusion

In JMeter, logic controllers play a pivotal role in shaping the behavior of our load and performance tests. By understanding the various types of logic controllers and their use cases, we can design comprehensive test scenarios that closely mimic real-world user interactions.