syndicate-js/packages/playground/src/ticker.js

47 lines
1.5 KiB
JavaScript

//---------------------------------------------------------------------------
// @syndicate-lang/syntax-test, a demo of Syndicate extensions to JS.
// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//---------------------------------------------------------------------------
import { Dataspace } from "@syndicate-lang/core";
message type Tick();
spawn named 'ticker' {
field this.counter = 0;
on start { console.log('ticker starting'); }
on stop { console.log('ticker stopping'); }
on message Tick() {
this.counter++;
console.log('tick', new Date(), this.counter);
if (this.counter < 5) {
Dataspace.backgroundTask((finish) => {
setTimeout(Dataspace.wrapExternal(() => {
<< Tick();
finish();
}), 1000);
});
}
}
on start {
console.log('sending first tick');
<< Tick();
}
}