I have created a simple model in AnyLogic (see screenshot). Now I want to add a condition that selects one of the two resource sets in the service block. As an example the following scenario shall apply: If there are more than 5 parts in the queue, worker 3 and worker 4 should perform the service. If there are <= 5 parts in the queue, the service shall be performed by worker 1 and worker 2. This is only meant to be a simplified example. I am primarily interested in solving this problem using a condition. I have already tried different approaches, but without success. Does anyone have an idea how the Java code for this condition could look like?
First, you don't need the queue since the service block already has a queue... So For this particular example in your resource choice conditions you will do the following:
service.queueSize()>5 ? (worker3.containsUnit(unit) || worker4.containsUnit(unit))
:
(worker1.containsUnit(unit) || worker2.containsUnit(unit))
You can change service.queueSize() with queue.size() if you insist in using a queue. After that you need to be sure to recalculate the conditions when needed, for this particular example i think you only need to recalculate them on exit action of the service block:
self.recalculateResourceChoiceConditions();
One easy approach is to use Seize and Delay (and Release once done) blocks instead of Service. Before Seize, you can place your condition in a SelectOutputOut block. Like this:
Related
I refer to a similar problem here.
I implemented a programmatically created schedule same as in the example model from AnyLogic Cloud. Then I added the suggested code in the capacity field.
Still, my problem is the following runtime error: "The parameter capacitySchedule cannot be changed dynamically". Does it just basically does not work with the resource pool compared to the Transporter Fleet presented in the similar problem? Unfortunately it does not work with a fake schedule either.
Here are some screenshots from my model. Thanks in advance.
To work with dynamic capacity of ResourcePool, I use a schedule shift by plan.
in some cases it meets the need.
The implementation of this is simple, in the schedule you give values 1,2,3 etc. They actually point to a position in the array.
Example of the schedule
And inside the ResourcePool you define it as follows:
Example of the ResourcePool by plane
In my example, at times when the schedule value is 4 the capacity of the ResourcePool is 0 and at other times it is as per my parameters.
Change the "Kapaziät definiert" to "By schedule".
Create a fake schedule object fakeSchedule (normally, not programmatically). Make sure it always returns 0 as the value.
Then, use this call for "Kapazität":
' mySchedule == null ? fakeSchedule : mySchedule`
This will tell the pool to use your schedule if it exists, else the fake one
I've been trying to model a scenario but still cannot find the best way to do it. The scenario is as follows:
Agents arrive at a point where they need to choose one of three paths. Each path is a delay with capacity 1. If the first path already has an agent in it (in the delay block), then the 1st condition is not met and the agent tries the second port. In the second port, if the delay block is available it can proceed, otherwise it checks the third. If all are busy, then the agent should wait in a queue before the select output.
To model this process, I used the following sequence:
Queue > Hold > Select Output 5 > 1 Delay element of capacity 1 after each of the three first output ports of the select output
The condition for the select output is for example "Delay1.size() == 0" then for the second port "Delay2.size() == 0", etc.
Then, I created a function that checks if all delay.size() == 1, then the hold element is set to blocked to avoid having agents going through the select output's default port. The function is tested at every "On Enter" and "On Exit" fields of all the blocks.
Despite the above, agents are still going through the default port which means that the hold element is not working properly.
Is there a more efficient way to model the described scenario? Thank you!
Well, you are not actually blocking your Hold element at all, hence agents will walk through anytime :-)
There are many ways for such a situation.
You could replace the Delay with a Wait element instead. Whenever an agent leaves one of your Delay blocks, you unblock the Hold.
Whenever an agent passes the Hold, you block it, but only if all 3 pathes are currently busy.
Should do the trick
I have a pool of 25 agents (Operators). When an Order is generated, I seize a few Operators and move them to one of many different ProductionSuites as determined by a parameter in the Order.
Within the ProductionSuite, I have a variable of type ResourcePool that I would like to use to have these Operators perform tasks.
In the main window, I put this code in the "On seize unit:" code box:
agent.assignedSuite.suiteOperatorPool.addAgentToContents(unit);
but this triggers a NullPointerException error. Am I using the addAgentToContents method incorrectly?
You have not initialized your suiteOperatorPool variable, it's "initial value" field is empty. Hence, this is just an empty shell of type ResourcePool that cannot do anything, including adding agents to it.
You would need to initialize it properly using the ResourcePool API, but I don't think that is possible.
Also, you cannot have resources be part of 2 resource pools, as you are trying to do. You should think of a different way to solve your problem. Maybe rephrase the issue so we can think of alternatives. You might not need a RP at all but just use pure agent functionality...?
I have created a process in jbpm 6. There is a class Person, with attributes name and age. In the process form, the name and age of the person is entered. The first node in the process is a human task to view the details. The second node is an XOR gateway with drools expression on its arcs like Person(age > 20) and Person (age < 20).
Now when I execute the process instance, the first human tasks works fine, but when it reaches the gateway, I can see this error -
"XOR split could not find at least one valid outgoing connection for
split Gateway".
Any idea whats wrong.
Gateways containing drools expressions only work with facts and not with process variables. If you want to make use of a drools expression in your gateways, you will need to insert the process variable (or the whole process instance) as a fact. You can do so by using a script node, an outgoing action in your human task.
From documentation:
Rule constraints do not have direct access to variables defined inside the process. It is however possible to refer to the current process instance inside a rule constraint, by adding the process instance to the Working Memory and matching for the process instance in your rule constraint. ....... Note that you are however responsible yourself to insert the process instance into the session and, possibly, to update it, for example, using Java code or an on-entry or on-exit or explicit action in your process.
Hope it helps,
In Locust Load test Enviroment tasks are defined and are called randomly.
But if i want a task to be performed just after a specific task. Then how do i do it?
for ex: after every 'X' url call i want 'Y' url to be called based on the response of 'X'.
In my experience, I found that it's better to model Locust tasks as completely independent of each other, and each of them covering a user scenario or behavior (eg. customer logs in, searches for a book and adds it to the cart). This is mostly because that's a closer simulation of the user's behavior.
Have you tried just having the multiple requests on the same task, and just if / else based on your responses? This slide from Carl Byström's talk follows said approach.
You just have to make a sequential gets or posts. When you define your task do something like this:
#task(10)
def my_task(l):
l.client.get('/X')
l.client.get('/Y')
There's an option to create a custom task set inherited from TaskSequence class.
Then you should add seq_task decorators to all task set methods to run its tasks sequentially.
https://docs.locust.io/en/latest/writing-a-locustfile.html#tasksequence-class