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DemandMatcher improvements from minimart

This commit is contained in:
Tony Garnock-Jones 2013-10-30 13:13:03 +00:00
parent 1a8cc0edac
commit 5d6cc2b503
2 changed files with 75 additions and 34 deletions
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22
index.js
View File

@ -25,32 +25,22 @@ JQueryEventRouter.prototype.handleEvent = function (e) {
}
};
function JQueryDriver() {
var self = this;
this.state = new DemandMatcher(true, function (r) {
function spawnJQueryDriver() {
var d = new DemandMatcher(["jQuery", __, __, __]);
d.onDemandIncrease = function (r) {
var selector = r.pattern[1];
var eventName = r.pattern[2];
World.spawn(new JQueryEventRouter(selector, eventName),
[pub(["jQuery", selector, eventName, __]),
pub(["jQuery", selector, eventName, __], 0, 1)]);
});
};
World.spawn(d);
}
JQueryDriver.prototype.boot = function () {
World.updateRoutes([pub(["jQuery", __, __, __], 0, 1),
sub(["jQuery", __, __, __], 0, 1)]);
};
JQueryDriver.prototype.handleEvent = function (e) {
if (e.type === "routes") {
this.state.handleRoutes(e.routes);
}
};
var g = new Ground(function () {
console.log('starting ground boot');
World.spawn(new Spy());
World.spawn(new JQueryDriver());
spawnJQueryDriver();
World.spawn({
// step: function () { console.log('dummy step'); },
boot: function () {

87
marketplace.js
View File

@ -421,6 +421,12 @@ PresenceDetector.prototype._digestRoutes = function (routes) {
return newState;
};
PresenceDetector.prototype.getRouteList = function () {
var rs = [];
for (var k in this.state) { rs.push(this.state[k]); }
return rs;
};
PresenceDetector.prototype.handleRoutes = function (routes) {
var added = [];
var removed = [];
@ -456,32 +462,77 @@ PresenceDetector.prototype.presenceExistsFor = function (probeRoute) {
/*---------------------------------------------------------------------------*/
/* Utilities: matching demand for some service */
function DemandMatcher(demandSideIsSubscription, demandIncreaseHandler, supplyDecreaseHandler) {
this.demandSideIsSubscription = demandSideIsSubscription;
this.demandIncreaseHandler = demandIncreaseHandler;
this.supplyDecreaseHandler = supplyDecreaseHandler || function (r) {
console.error("Unexpected drop in supply for route", r);
function DemandMatcher(pattern, metaLevel, options) {
options = $.extend(options, {
demandLevel: 0,
supplyLevel: 0,
demandSideIsSubscription: true
});
this.pattern = pattern;
this.metaLevel = metaLevel;
this.demandLevel = options.demandLevel;
this.supplyLevel = options.supplyLevel;
this.demandSideIsSubscription = options.demandSideIsSubscription;
this.onDemandIncrease = function (r) {
console.error("Unhandled increase in demand for route", r);
};
this.onSupplyDecrease = function (r) {
console.error("Unhandled decrease in supply for route", r);
};
this.state = new PresenceDetector();
}
DemandMatcher.prototype.boot = function () {
World.updateRoutes([this.computeDetector(true),
this.computeDetector(false)]);
};
DemandMatcher.prototype.handleEvent = function (e) {
if (e.type === "routes") {
this.handleRoutes(e.routes);
}
};
DemandMatcher.prototype.computeDetector = function (demandSide) {
var maxLevel = (this.demandLevel > this.supplyLevel ? this.demandLevel : this.supplyLevel);
return new Route(this.demandSideIsSubscription ? !demandSide : demandSide,
this.pattern,
this.metaLevel,
maxLevel + 1);
};
DemandMatcher.prototype.handleRoutes = function (routes) {
var changes = this.state.handleRoutes(routes);
for (var i = 0; i < changes.added.length; i++) {
if (changes.added[i].isSubscription === this.demandSideIsSubscription
&& !this.state.presenceExistsFor(changes.added[i]))
{
this.demandIncreaseHandler(changes.added[i]);
this.incorporateChanges(true, changes.added);
this.incorporateChanges(false, changes.removed);
};
DemandMatcher.prototype.incorporateChanges = function (isArrivals, routeList) {
var relevantChangeDetector = this.computeDetector(isArrivals);
var expectedChangeLevel = isArrivals ? this.demandLevel : this.supplyLevel;
var expectedPeerLevel = isArrivals ? this.supplyLevel : this.demandLevel;
for (var i = 0; i < routeList.length; i++) {
var changed = routeList[i];
if (changed.level != expectedChangeLevel) continue;
var relevantChangedN = intersectRoutes([changed], [relevantChangeDetector]);
if (relevantChangedN.length === 0) continue;
var relevantChanged = relevantChangedN[0]; /* there can be only one */
var peerDetector = new Route(relevantChanged.isSubscription,
relevantChanged.pattern,
relevantChanged.metaLevel,
expectedPeerLevel + 1);
var peerRoutes = intersectRoutes(this.state.getRouteList(), [peerDetector]);
var peerExists = false;
for (var j = 0; j < peerRoutes.length; j++) {
if (peerRoutes[j].level == expectedPeerLevel) {
peerExists = true;
break;
}
}
if (isArrivals && !peerExists) { this.onDemandIncrease(relevantChanged); }
if (!isArrivals && peerExists) { this.onSupplyDecrease(relevantChanged); }
}
for (var i = 0; i < changes.removed.length; i++) {
if (changes.removed[i].isSubscription === !this.demandSideIsSubscription
&& this.state.presenceExistsFor(changes.removed[i]))
{
this.supplyDecreaseHandler(changes.removed[i]);
}
}
}
};
/*---------------------------------------------------------------------------*/
/* Ground interface */