I am building a DES-ABM hybrid model in AnyLogic.
The agents go through the DES blocks, among which multiple Delay blocks.
How do I
access an agent which is in a Delay block
or peferrably
acces the specific agent which triggered the 'on enter' action of the delay block?
My ultimate goal is to open or close a valve object on the agent frame
So can I/ how do I
A. open or close the valve on the agent frame directly form the main/root frame (on which the Delay block is located)
or if that is not possible
B. send a message or trigger a statechart within the specific agent which will then open or close the valve from the agent's own frame?
I have tried to use the 'DelayBlockName'.agents() function, but this does not work and returns [] when I check it using traceln.
access an agent which is in a Delay block or peferrably
use the keyword agent. These keywords differ for different library blocks so best start learning about the lightbulb and how it can help, see here.
acces the specific agent which triggered the 'on enter' action of the delay block?
When you write agent. in the "On enter" block, every agent coming through will execute that code, so by definition, it is always the specific agent :)
My ultimate goal is to open or close a valve object on the agent frame So can I/ how do I A. open or close the valve on the agent frame directly form the main/root frame (on which the Delay block is located) or if that is not possible B. send a message or trigger a statechart within the specific agent which will then open or close the valve from the agent's own frame?
this is something completely different to your original question and just... messy. Please limit questions to 1 topic so it is easy for us to answer :) (see this guide for more)
Related
I want to store process times in my model for each agent of type Box. For this purpose I have created a Java class ProcessData.
My problem is that I always get NullPointerExceptions. I don't know if it's because of my code or the functionality of the batch block.
When the wait block reaches a certain size, all agents of type Box are routed to the batch block. The batch agent then waits in the seize block for staff member. If the agent is then seized, each agent of type Box contained in the batch agent should then get a start processing time. This is my code at enter of the delay block: box.getProcessData().add(new ProcessData(date(), duration()));. Using a constructor, I add the start time and duration as new variables to a new ProcessData entry.
To determine the end time of each Box agent I have the following code at unbatch block entry: box.getProcessData().getLast().setEnd(date());
Since I have a NullPointerException I can't tell exactly where it came from. My guess is that I have a bug with addressing the code: should I use agent. (from batch) or box. (name of original agent before batch)? Or is it not possible to give the batch agent properties that are inherited by the box agent?
First error is at unbatch, so the second code from above and second error is the following public void onExit( Box batch, Box agent ) { _unbatch_onExit_xjal( this, batch, agent ); }.
Following the screenshot of my error:
The problem you have with this model first,is that you are seizing a resource for the batch without releasing that resource... you need to release before unbatch
your error nevertheless is related to some code that you wrote in the on exit action of the unbatch block that you are unfortunately not telling us
But to discover what is null, check with a traceln() the value of the variables that are present in the on exit section of the unbatch in order to print on the screen what is null
is there any easy way to detect that agent stopped on a roller conveyor because there are other agents ahead? I tried to use dynamic variable and conditional event but it is consuming too much performence. I don´t want to go for dynamically checking condition (with cyclic event) because I have some bad experience with it.
Thanks!
Try this:
Create a LinkedList<YourAgentType> agentsOnConveyor.
Whenever an agent enters the conveyor, call agentsOnConveyor.addLast(agent). When it leaves, call agentsOnConveyor.removeFirst(agent).
Now you have a linked representation of the agents on the conveyor.
Last, you use the "on stopped" field in the conveyor and pass the message "upstream" through the linked list, i.e. use a for-loop from the first to the last entry and send them a msg "conveyor stopped".
You may still need to check if the individual agent is moving itself or has also stopped, but it might put you on a working path
I am trying to force agents of a population to exchange messages in AnyLogic. I would like each time agent A sends a message to B the icon of the message to move from A to B. How can I implement this?
The code Emile sent you works to move an agent from one place to another one. I understand you don't want to move your two agents, but instead you want to move only a "message icon" from one to the other. For that you can create an agent (let's call it agent "Message"), create it and locate it in the agentA, and tell it (as Emile said) to move to agentB: messageAB.moveTo(agentB.getPosition()); this way you'll get the effect you want.
You could also:
use a timer to move from one place to another, or
use an event and change the position of the icon dinamically depending on how much time you have remaining on that event
use a source/delay/sink for the same as in point 2
There are basically two ways to move an agent:
Jump to agent B: Instantly appears near agent B
Move to agent A at a certain speed
For each one the code is respectively as follows:
agentA.jumpTo( agentB.getXYZ() );
agentA.moveTo( agentB );
Where agentA and agentB refer to the agents which you might call differently depending where you are in the model.
I am building a DES-ABM hybrid model in AnyLogic. The agents go through the DES blocks on the main frame. From these blocks on the main/root frame, I want to open a valve on the agent frame.
When I use agent.xxx and it finds the proper agent with all elements on the agent frame.
I used
'''agent.valve_trafficsignIN.open(); ''' (in a DES block on main/rootframe)
to open the valve on the agent frame. It does not give me any errors when I run it. Also, when I print the information using traceln, it gives me the correct specs of the valve in question and it states that it is open.
However, when I open the agent frame, the valve is still closed. Also, the changes that should happen in the model when the valve opens do not happen.
What should I change/how do I open the valve on the agent frame from the main/root frame?
I found out that a DES source block generates agents in a DeafaultPopulation, which is why I could not find the correct agent during the simulation run. I changed the source setting to 'add agents to: custom population' and I can now find, and refer to, the right agent.
I would like to start loading my truck when the truck arrives at the dock. How could I activate the enter block startloading? When it comes to the block pickupOrders, the truck doesn't load my pallets because I don't know how to activate the block enter "startloading". The source block is part of the agent "truck", the enter block is part of the agent "pallet".
process_logic_simulation
process
As per the Help article, you need to fill the queue for the Pickup block yourself.
Your Enter block cannot create agents that fill up your queue (see the help on what an Enter block does). Replace it with a Source block to actually create agents directly.
If, however, your agents for the queue already exist, you can push them into your Enter block using an Exit block from where they live. In the Exit block "on Exit" code, write myEnterBlock.take(agent) to push them in.
Also, many example models showing you Enter/Exit setup in more detail.