Follow NC paper draft
This commit is contained in:
Tony Garnock-Jones
parent
680ca2bc4e
commit
ef057b29cc
238
marketplace.js
238
marketplace.js
|
|
@ -62,77 +62,227 @@ function anyUnify(aa, bb) {
|
|||
}
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/* Relaying */
|
||||
/* Events and Actions */
|
||||
|
||||
function Route(isSubscription, pattern, isMeta, level) {
|
||||
function Route(isSubscription, pattern, metaLevel, level) {
|
||||
this.isSubscription = isSubscription;
|
||||
this.pattern = pattern;
|
||||
this.isMeta = isMeta ? true : false;
|
||||
this.metaLevel = (metaLevel === undefined) ? 0 : metaLevel;
|
||||
this.level = (level === undefined) ? 0 : level;
|
||||
}
|
||||
|
||||
function sub(pattern, isMeta, level) {
|
||||
return new Route(true, pattern, isMeta, level);
|
||||
Route.prototype.drop = function () {
|
||||
if (this.metaLevel === 0) { return null; }
|
||||
return new Route(this.isSubscription, this.pattern, this.metaLevel - 1, this.level);
|
||||
};
|
||||
|
||||
Route.prototype.lift = function () {
|
||||
return new Route(this.isSubscription, this.pattern, this.metaLevel + 1, this.level);
|
||||
};
|
||||
|
||||
function sub(pattern, metaLevel, level) {
|
||||
return new Route(true, pattern, metaLevel, level);
|
||||
}
|
||||
|
||||
function pub(pattern, isMeta, level) {
|
||||
return new Route(false, pattern, isMeta, level);
|
||||
function pub(pattern, metaLevel, level) {
|
||||
return new Route(false, pattern, metaLevel, level);
|
||||
}
|
||||
|
||||
function spawn(actor) { /* TODO: initialRoutes */
|
||||
return { type: "spawn", actor: actor };
|
||||
function spawn(behavior, initialRoutes) {
|
||||
return { type: "spawn",
|
||||
behavior: behavior,
|
||||
initialRoutes: (initialRoutes === undefined) ? [] : initialRoutes };
|
||||
}
|
||||
|
||||
function updateRoutes(routes) {
|
||||
return { type: "routes", routes: routes };
|
||||
}
|
||||
|
||||
function sendMessage(m) {
|
||||
return { type: "send", isMeta: false, message: m };
|
||||
function sendMessage(m, metaLevel, isFeedback) {
|
||||
return { type: "send",
|
||||
metaLevel: (metaLevel === undefined) ? 0 : metaLevel,
|
||||
message: m,
|
||||
isFeedback: (isFeedback === undefined) ? false : isFeedback };
|
||||
}
|
||||
|
||||
function metaMessage(m) {
|
||||
return { type: "send", isMeta: true, message: m };
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/* Metafunctions */
|
||||
|
||||
function dropRoutes(routes) {
|
||||
var result = [];
|
||||
for (var i = 0; i < routes.length; i++) {
|
||||
var r = routes[i].drop();
|
||||
if (r) { result.push(r); }
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
function liftRoutes(routes) {
|
||||
var result = [];
|
||||
for (var i = 0; i < routes.length; i++) {
|
||||
result.push(routes[i].lift());
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
function filterEvent(e, routes) {
|
||||
switch (e.type) {
|
||||
case "routes":
|
||||
var result = [];
|
||||
for (var i = 0; i < e.routes.length; i++) {
|
||||
for (var j = 0; j < routes.length; j++) {
|
||||
var ri = e.routes[i];
|
||||
var rj = routes[j];
|
||||
if (ri.isSubscription === !rj.isSubscription
|
||||
&& ri.metaLevel === rj.metaLevel
|
||||
&& ri.level < rj.level)
|
||||
{
|
||||
var u = unify(ri.pattern, rj.pattern);
|
||||
if (u) {
|
||||
var rk = new Route(ri.isSubscription, u.result, ri.metaLevel, ri.level);
|
||||
result.push(rk);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return result.length ? result : null;
|
||||
case "send":
|
||||
for (var i = 0; i < routes.length; i++) {
|
||||
var r = routes[i];
|
||||
if (e.metaLevel === r.metaLevel
|
||||
&& e.isFeedback === !r.isSubscription
|
||||
&& unify(e.message, r.pattern))
|
||||
{
|
||||
return e;
|
||||
}
|
||||
}
|
||||
return null;
|
||||
default:
|
||||
throw { message: "Event type " + e.type + " not filterable",
|
||||
event: e };
|
||||
}
|
||||
}
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/* Configurations */
|
||||
|
||||
function World(bootActions) {
|
||||
this.nextPid = 0;
|
||||
this.eventQueue = [];
|
||||
this.processTable = {};
|
||||
this.downwardRoutes = [];
|
||||
this.pendingActions = [];
|
||||
this.processActions = [];
|
||||
this.activePid = null;
|
||||
this.enqueueActions(-1, bootActions);
|
||||
}
|
||||
|
||||
/* Class state / methods */
|
||||
|
||||
World.current = null; // parameter
|
||||
|
||||
World.send = function (m, metaLevel, isFeedback) {
|
||||
World.current.enqueueAction(sendMessage(m, metaLevel, isFeedback));
|
||||
};
|
||||
|
||||
World.updateRoutes = function (routes) {
|
||||
World.current.enqueueAction(updateRoutes(routes));
|
||||
};
|
||||
|
||||
World.spawn = function (behavior, initialRoutes) {
|
||||
World.current.enqueueAction(spawn(behavior, initialRoutes));
|
||||
};
|
||||
|
||||
/* Instance methods */
|
||||
|
||||
World.prototype.enqueueAction = function (action) {
|
||||
this.processActions.push([this.activePid, action]);
|
||||
};
|
||||
|
||||
World.prototype.enqueueActions = function (pid, actions) {
|
||||
for (var i = 0; i < actions.length; i++) {
|
||||
this.pendingActions.push([pid, actions[i]]);
|
||||
this.processActions.push([pid, actions[i]]);
|
||||
}
|
||||
};
|
||||
|
||||
World.prototype.boot = function () {
|
||||
this.performPendingActions();
|
||||
World.prototype.isQuiescent = function () {
|
||||
return this.eventQueue.length === 0 && this.processActions.length === 0;
|
||||
};
|
||||
|
||||
World.prototype.performPendingActions = function () {
|
||||
var queue = this.pendingActions;
|
||||
this.pendingActions = [];
|
||||
World.prototype.step = function () {
|
||||
this.dispatchEvents();
|
||||
this.performActions();
|
||||
return this.stepChildren() || !this.isQuiescent();
|
||||
};
|
||||
|
||||
World.prototype.asChild = function (pid, f) {
|
||||
var oldWorld = World.current;
|
||||
var result = null;
|
||||
World.current = this;
|
||||
this.activePid = pid;
|
||||
try {
|
||||
result = f();
|
||||
} catch (e) {
|
||||
this.kill(pid, e);
|
||||
}
|
||||
this.activePid = null;
|
||||
World.current = oldWorld;
|
||||
return result;
|
||||
};
|
||||
|
||||
World.prototype.kill = function (pid, exn) {
|
||||
console.log("Killed process " + pid + (exn ? " with reason " + exn.message : ""));
|
||||
delete this.processTable[pid];
|
||||
this.issueRoutingUpdate();
|
||||
};
|
||||
|
||||
World.prototype.stepChildren = function () {
|
||||
var someChildBusy = false;
|
||||
for (var pid in this.processTable) {
|
||||
var p = this.processTable[pid];
|
||||
if (p.behavior.step /* exists, haven't called it yet */) {
|
||||
var childBusy = this.asChild(pid, function () { p.behavior.step() });
|
||||
someChildBusy = someChildBusy || childBusy;
|
||||
}
|
||||
}
|
||||
return someChildBusy;
|
||||
};
|
||||
|
||||
World.prototype.performActions = function () {
|
||||
var queue = this.processActions;
|
||||
this.processActions = [];
|
||||
var item;
|
||||
while ((item = queue.shift())) {
|
||||
this.performAction(item[0], item[1]);
|
||||
}
|
||||
};
|
||||
|
||||
World.prototype.dispatchEvents = function () {
|
||||
var queue = this.eventQueue;
|
||||
this.eventQueue = [];
|
||||
var item;
|
||||
while ((item = queue.shift())) {
|
||||
this.dispatchEvent(item);
|
||||
}
|
||||
};
|
||||
|
||||
World.prototype.performAction = function (pid, action) {
|
||||
switch (action.type) {
|
||||
case "spawn":
|
||||
this.doSpawn(action.actor);
|
||||
var pid = this.nextPid++;
|
||||
this.processTable[pid] = { routes: action.initialRoutes, behavior: action.behavior };
|
||||
if (behavior.boot) { this.asChild(pid, function () { behavior.boot() }); }
|
||||
this.issueRoutingUpdate();
|
||||
break;
|
||||
case "routes":
|
||||
this.doRoutes(pid, action.routes);
|
||||
this.processTable[pid].routes = action.routes;
|
||||
this.issueRoutingUpdate();
|
||||
break;
|
||||
case "send":
|
||||
this.doSend(pid, action.isMeta, action.message);
|
||||
if (action.metaLevel === 0) {
|
||||
this.eventQueue.push(action);
|
||||
} else {
|
||||
World.send(action.message, action.metaLevel - 1, action.isFeedback);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
throw { message: "Action type " + action.type + " not understood",
|
||||
|
|
@ -140,22 +290,40 @@ World.prototype.performAction = function (pid, action) {
|
|||
}
|
||||
};
|
||||
|
||||
World.prototype.doSpawn = function (actor) {
|
||||
this.processTable[this.nextPid++] = actor;
|
||||
World.prototype.aggregateRoutes = function (base) {
|
||||
var acc = base.slice();
|
||||
for (var pid in this.processTable) {
|
||||
var p = this.processTable[pid];
|
||||
for (var i = 0; i < p.routes.length; i++) {
|
||||
acc.push(p.routes[i]);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
World.prototype.handleEvent = function (e) {
|
||||
this.dispatchEvent(e);
|
||||
this.performPendingActions();
|
||||
World.prototype.issueRoutingUpdate = function () {
|
||||
this.eventQueue.push(updateRoutes(this.aggregateRoutes(this.downwardRoutes)));
|
||||
World.updateRoutes(dropRoutes(this.aggregateRoutes([])));
|
||||
};
|
||||
|
||||
World.prototype.dispatchEvent = function (e) {
|
||||
switch (e.type) {
|
||||
case "routes":
|
||||
break;
|
||||
case "send":
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
for (var pid in this.processTable) {
|
||||
var p = this.processTable[pid];
|
||||
var e1 = filterEvent(e, p.routes);
|
||||
if (e1) { this.asChild(pid, function () { p.behavior.handleEvent(e1) }); }
|
||||
}
|
||||
};
|
||||
|
||||
World.prototype.handleEvent = function (e) {
|
||||
switch (e.type) {
|
||||
case "routes":
|
||||
this.downwardRoutes = liftRoutes(e.routes);
|
||||
this.issueRoutingUpdate();
|
||||
break;
|
||||
case "send":
|
||||
this.eventQueue.push(sendMessage(e.message, e.metaLevel + 1, e.isFeedback));
|
||||
break;
|
||||
default:
|
||||
throw { message: "Event type " + e.type + " not understood",
|
||||
event: e };
|
||||
}
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue