42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
// Utility protocol for measuring when a stateChange takes effect.
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var RandomID = require('./randomid.js');
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var Dataspace = require('./dataspace.js').Dataspace;
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var Route = require('./route.js');
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var Patch = require('./patch.js');
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var $Ack = new Route.$Special('ack');
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function Ack(metaLevel, id) {
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this.metaLevel = metaLevel || 0;
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this.id = id || RandomID.randomId(16);
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this.done = false;
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}
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Ack.prototype.arm = function () {
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Dataspace.stateChange(Patch.sub([$Ack, this.id], this.metaLevel));
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Dataspace.send([$Ack, this.id], this.metaLevel);
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};
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Ack.prototype.disarm = function () {
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Dataspace.stateChange(Patch.unsub([$Ack, this.id], this.metaLevel));
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};
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Ack.prototype.check = function (e) {
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if (!this.done) {
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if (e.type === 'message') {
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var m = Patch.stripAtMeta(e.message, this.metaLevel);
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if (m && m[0] === $Ack && m[1] === this.id) {
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this.disarm();
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this.done = true;
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}
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}
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}
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return this.done;
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};
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///////////////////////////////////////////////////////////////////////////
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module.exports.$Ack = $Ack;
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module.exports.Ack = Ack;
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