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//
// A framework to make building Emscripten easier. Lets you write modular
// code to handle specific issues.
//
// Actor - Some code that processes items.
// Item - Some data that is processed by actors.
// Substrate - A 'world' with some actors and some items.
//
// The idea is to create a substrate, fill it with the proper items
// and actors, and then run it to completion. Actors will process
// the items they are given, and forward the results to other actors,
// until we are finished. Some of the results are then the final
// output of the entire calculation done in the substrate.
//
DEBUG = false;
Substrate = function(name_) {
this.name_ = name_;
this.actors = {};
this.currUid = 1;
};
Substrate.prototype = {
addItem: function(item, targetActor) {
if (targetActor == '/dev/null') return;
if (targetActor == '/dev/stdout') {
this.results.push(item);
return;
}
this.actors[targetActor].inbox.push(item);
},
addItems: function(items, targetActor) {
if (targetActor == '/dev/null') return;
if (targetActor == '/dev/stdout') {
this.results = this.results.concat(items);
return;
}
this.actors[targetActor].inbox = this.actors[targetActor].inbox.concat(items);
},
checkInbox: function(actor) {
var items = actor.inbox;
for (var i = 0; i < items.length; i++) {
var item = items[i];
if (!item.__uid__) {
item.__uid__ = this.currUid;
this.currUid ++;
}
}
actor.inbox = [];
actor.items = actor.items.concat(items);
},
addActor: function(name_, actor) {
assert(name_ && actor);
actor.name_ = name_;
actor.items = [];
actor.inbox = [];
actor.forwardItem = bind(this, this.addItem);
actor.forwardItems = bind(this, this.addItems);
this.actors[name_] = actor;
if (!actor.process) actor.process = Actor.prototype.process;
return actor;
},
solve: function() {
dprint('framework', "// Solving " + this.name_ + "...");
var startTime = Date.now();
var midTime = startTime;
var that = this;
function midComment(force) {
var curr = Date.now();
if (curr - midTime > 1000 || force) {
dprint('framework', '// Working on ' + that.name_ + ', so far ' + ((curr-startTime)/1000).toString().substr(0,10) + ' seconds.');
midTime = curr;
}
}
function finalComment() {
dprint('framework', '// Completed ' + that.name_ + ' in ' + ((Date.now() - startTime)/1000).toString().substr(0,10) + ' seconds.');
}
var finalResult = null;
this.results = [];
var finished = false;
var that = this;
while (!finished) {
dprint('framework', "Cycle start, items: ");// + values(this.actors).map(function(actor) actor.items).reduce(function(x,y) x+y, 0));
var hadProcessing = false;
values(this.actors).forEach(function(actor) {
midComment();
that.checkInbox(actor);
if (actor.items.length == 0) return;
var inputs = actor.items.slice(0);
var outputs;
var currResultCount = that.results.length;
try {
dprint('framework', 'Processing using ' + actor.name_ + ': ' + inputs.length);
actor.items = []; // More may be added in process(); we'll get to them next time
outputs = actor.process(inputs);
dprint('framework', 'New results: ' + (outputs.length + that.results.length - currResultCount) + ' out of ' + (that.results.length + outputs.length));
} catch (e) {
//print("Exception, current selected are: " + inputs.map(dump).join('\n\n'));
print("Stack: " + new Error().stack);
throw e;
}
hadProcessing = true;
if (outputs) {
if (outputs.length === 1 && outputs[0].__finalResult__) {
if (DEBUG) print("Solving complete: __finalResult__");
delete outputs[0].__finalResult__; // Might recycle this
delete outputs[0].__uid__;
finalComment();
finished = true;
finalResult = outputs[0];
} else {
outputs.forEach(function(output) { delete output.tokens }); // clean up tokens to save memory
that.results = that.results.concat(outputs);
}
}
});
if (!hadProcessing) {
if (DEBUG) print("Solving complete: no remaining items");
finalComment();
this.results.forEach(function(output) {
delete output.__uid__; // Might recycle these
});
return this.results;
}
if (finalResult) {
return finalResult;
}
midComment();
}
}
};
// Global access to the currently-being processed item.
// Note that if you overload process in Actor, this will need to be set if you rely on it.
var Framework = {
currItem: null
};
Actor = function() { };
Actor.prototype = {
process: function(items) {
var ret = [];
for (var i = 0; i < items.length; i++) {
var item = items[i];
try {
Framework.currItem = item;
var outputs = this.processItem(item);
Framework.currItem = null; // Do not keep an unneeded reference. Note that we don't care about this if an exception is thrown
if (outputs) {
ret = ret.concat(outputs);
}
} catch (e) {
print("Exception in process(), current item is: " + dump(item));
throw e;
}
}
return ret;
}
};
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