What is Netstream ?

Netstream is basically a network protocol aiming at opening the GraphStream project access to other tools/projects/programs especially those written in other languages than Java. The interface is managed through a network interface (client/server approach).

The gs-gama Plug-in

gs-gama allows to connect a GAMA simulation with an external software supporting the NetStream protocol, such as GraphStream-based applications..
https://github.com/graphstream/gs-gama/wiki

Installation of gs-gama

• From the USB key provided: none! It is already integrated in the special version of GAMA.
• Otherwise: for future versions of gs-gama, install it as a plug-in from the Market Place.

The GAMA Model

A model of mobility simulation

• Some people over an environment move randomly.
• Each person has a device which establishes a connection with closest devices.
• This connection disappears as soon as they are too far.

Demo of interactions with GAMA

Installation of the GAMA model

GAMAProject

File > Import... > General > Existing projects into workspace

Demo_NeX2015

Finish

Demo of interactions with GAMA

GraphStream side

NetStreamReceiver receiver = new NetStreamReceiver("localhost", 2001);
Viewer v = new Viewer(receiver.getDefaultStream());
v.addDefaultView(true);
						

Demo of interactions with GAMA

GAMA side

gs_clear_senders;
gs_add_sender gs_host:"localhost" gs_port:2001 gs_sender_id:"humans";
						

Demo of interactions with GAMA

GAMA side

init {
	gs_add_node gs_sender_id:"humans" gs_node_id:name;
	gs_add_node_attribute gs_sender_id:"humans" gs_node_id:name gs_attribute_name:"x" gs_attribute_value:location.x;
	gs_add_node_attribute gs_sender_id:"humans" gs_node_id:name gs_attribute_name:"y" gs_attribute_value:location.y*-1;
}
						

Demo of interactions with GAMA

GAMA side

reflex move {
	if(tar.x = location.x and tar.y = location.y){
		tar <- any_location_in(world.shape);
	}
	do goto target:tar speed: 5;
	gs_add_node_attribute gs_sender_id:"humans" gs_node_id:name gs_attribute_name:"x" gs_attribute_value:location.x;
	gs_add_node_attribute gs_sender_id:"humans" gs_node_id:name gs_attribute_name:"y" gs_attribute_value:location.y*-1;
}
						

Demo of interactions with GAMA

GAMA side

if(distance_to(self, humans_connected[i]) > length){
	gs_remove_edge gs_sender_id:"humans" gs_edge_id:(name + humans_connected[i].name);
	remove index:i from: humans_connected;
}
						

if(!contains(humans_connected, humans[i])){
	humans_connected <- humans_connected + humans[i];
	gs_add_edge gs_sender_id:"humans" gs_edge_id:(name + humans[i].name) gs_node_id_from:name gs_node_id_to:humans[i].name gs_is_directed:true;
}