Comments (1)
Hi @subodhcjoshi82 - sorry for the delay in replying. It appears you want fork/join type behavior. It's possible to do this with a number flow control libs (machina can do it as well) - it just depends on what you feel best models the problem. One possible way to model what you have above would be with three states (I'm oversimplifying, potentially): Uninitialized, Processing & Done. Start
would be an input to the FSM while in uninitialized, and Node0-Node3 would have "done" events that get passed to the FSM as input handlers in the "Processing" state and once all are complete, the transition to the Done
state would occur. Here's some pseudo code:
var fsm = new machina.Fsm({
constraints: {
processing: {
nextState: "done",
checkList: {
node0: false,
node1: false,
node2: false,
node3: false
}
}
},
checkIfReady: function() {
if(!this.constraints[this.state]) {
return;
}
if(_.all(this.constraints[this.state].checkList, function(constraint) { return constraint; })) {
this.transition(this.constraints[this.state].nextState);
}
}
initialize: function(options) {
// Hook into node0-3 events
// for ex.
var self = this;
options.node0.on("completed", function() {
self.handle("node0.complete");
});
},
states: {
uninitialized : {
start: "processing"
},
// the input handlers are obviously repetitive here and
// could be made a bit more terse
processing : {
"node0.complete" : function() {
this.constraints.processing.node0 = true;
this.checkIfReady();
},
"node1.complete" : function() {
this.constraints.processing.node1 = true;
this.checkIfReady();
},
"node2.complete" : function() {
this.constraints.processing.node2 = true;
this.checkIfReady();
},
"node3.complete" : function() {
this.constraints.processing.node3 = true;
this.checkIfReady();
}
},
done: {
_onEnter: function() {
// yay - we made it.
}
}
}
});
This is a fairly verbose implementation unfortunately, so it might not be the best fit if all you need is something simple like step, async.js, etc. Flow control is effectively an FSM under the surface , other libs specializing in it provide an API that's tailored for that concern....
from machina.js.
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