How to Update Variables Based on ResourcePool Nodes in AnyLogic?

 Updating variables based on ResourcePool nodes in AnyLogic involves understanding how to access and manipulate the properties of ResourcePool objects and their associated resources. Here's a detailed guide on how to achieve this:

Steps to Update Variables Based on ResourcePool Nodes

Define the Variables:

Ensure that you have the variables you want to update defined in your model. These variables can be at the model level or within an agent class, depending on your specific needs.

Access the ResourcePool Node:

You need to have a ResourcePool object in your model. This can be defined in the Main agent or any other agent.

For example, let's say you have a ResourcePool named myResourcePool.

Determine the Update Criteria:

Define the criteria or event that will trigger the update of your variables. This could be an event such as a resource being seized, released, or any custom condition you define.

Write the Update Logic:

Use AnyLogic's built-in functions and events to write the logic for updating your variables.

Example Scenario

Suppose you want to update a variable resourceUtilization every time a resource is seized and released in a ResourcePool.

Step-by-Step Implementation

Define the Variable:

Let's define a variable resourceUtilization at the model level.

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double resourceUtilization = 0.0;

Create a ResourcePool:

Add a ResourcePool named myResourcePool to your model.

Add Seize and Release Blocks:

Add Seize and Release blocks to your process flow, which use the myResourcePool.

Update Variable on Resource Seize:

In the properties of the Seize block, find the "After Seizing" section and add the following code to update the resourceUtilization variable:

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resourceUtilization = myResourcePool.utilization();

Update Variable on Resource Release:

In the properties of the Release block, find the "After Releasing" section and add the following code to update the resourceUtilization variable:

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resourceUtilization = myResourcePool.utilization();

Advanced Example with Custom Criteria

Let's consider a more complex example where you want to update a variable based on custom criteria. For instance, you want to track the number of busy resources and update a variable busyResourceCount.

Define the Variable:

Define a variable busyResourceCount at the model level.

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int busyResourceCount = 0;

Add a Custom Event or Function:

Create a custom function or event that will check the status of resources in myResourcePool.

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void updateBusyResourceCount() {

    int count = 0;

    for (ResourceUnit resource : myResourcePool.getUnits()) {

        if (resource.isBusy()) {

            count++;

        }

    }

    busyResourceCount = count;

}

Trigger the Custom Function:

Call this function in the "After Seizing" and "After Releasing" sections of your Seize and Release blocks respectively.

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updateBusyResourceCount();

Conclusion

By following these steps, you can effectively update variables based on the state and activities of ResourcePool nodes in AnyLogic. This allows for dynamic and responsive models that can better simulate real-world scenarios. Remember to test your logic thoroughly to ensure that the variables are updated correctly as per your requirements.