michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:    http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: /**
michael@0:  * Test the eventLoopLag actor.
michael@0:  */
michael@0: 
michael@0: "use strict";
michael@0: 
michael@0: function run_test()
michael@0: {
michael@0:   let {EventLoopLagFront} = devtools.require("devtools/server/actors/eventlooplag");
michael@0: 
michael@0:   DebuggerServer.init(function () { return true; });
michael@0:   DebuggerServer.addBrowserActors();
michael@0: 
michael@0:   // As seen in EventTracer.cpp
michael@0:   let threshold = 20;
michael@0:   let interval = 10;
michael@0: 
michael@0: 
michael@0:   let front;
michael@0:   let client = new DebuggerClient(DebuggerServer.connectPipe());
michael@0: 
michael@0:   // Start tracking event loop lags.
michael@0:   client.connect(function () {
michael@0:     client.listTabs(function(resp) {
michael@0:       front = new EventLoopLagFront(client, resp);
michael@0:       front.start().then(success => {
michael@0:         do_check_true(success);
michael@0:         front.once("event-loop-lag", gotLagEvent);
michael@0:         do_execute_soon(lag);
michael@0:       });
michael@0:     });
michael@0:   });
michael@0: 
michael@0:   // Force a lag
michael@0:   function lag() {
michael@0:     let start = new Date();
michael@0:     let duration = threshold + interval + 1;
michael@0:     while (true) {
michael@0:       if (((new Date()) - start) > duration) {
michael@0:         break;
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Got a lag event. The test will time out if the actor
michael@0:   // fails to detect the lag.
michael@0:   function gotLagEvent(time) {
michael@0:     do_print("lag: " + time);
michael@0:     do_check_true(time >= threshold);
michael@0:     front.stop().then(() => {
michael@0:       finishClient(client);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   do_test_pending();
michael@0: }