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(function () {
var send = function (service, json) {
if (json instanceof Object) json = codeq.jsonize(json);
return Q.Promise(function (resolve, reject, notify) {
$.ajax({
'type': 'POST',
'url': codeq.urlPrefix + service,
'accepts': 'application/json',
'contentType': 'application/json; charset=UTF-8', // type of our request
'data': json,
'processData': false, // don't process outgoing data
'dataType': 'json', // expected type of the response
'timeout': 60000, // one minute
'error': function sendErrorHandler(jqXHR, textStatus, errorThrown) {
reject(new Error(errorThrown || textStatus));
},
'success': function sendSuccessHandler(data, textStatus, jqXHR) {
resolve(data);
}
});
});
};
var activities = {}, // keyed by problem_id: activity info waiting to be sent to the server
activityKeys = [], // the keys to activities dictionary
resolveActivity = function (promiseResolvers) {
var i;
// signal everyone that the queue is flushed
for (i = 0; i < promiseResolvers.length; i++) {
try {
promiseResolvers[i][0]();
}
catch (e) {}
}
promiseResolvers.length = 0;
},
sendActivityInternal = function () {
var activityKey, activityDescriptor, trace, sendCount;
// send max. 100 activities, do not be excessive
if (activityKeys.length == 0) return;
activityKey = activityKeys[0];
activityDescriptor = activities[activityKey];
trace = activityDescriptor.trace;
if (trace.length > 100) {
sendCount = 100;
trace = trace.slice(0, 100);
}
else {
sendCount = trace.length;
}
send('activity', {'trace': trace, 'solution': activityDescriptor.solution, 'problem_id': activityDescriptor.problem_id, 'sid': codeq.sid}).then(
function sendActivitySuccess() {
activityDescriptor.trace.splice(0, sendCount);
if (activityDescriptor.trace.length > 0) sendActivityInternal();
else {
delete activities[activityKey];
activityKeys.shift();
resolveActivity(activityDescriptor.promiseResolvers);
}
},
function sendActivityFailure() {
Q.delay(500).then(sendActivityInternal).done();
}
).done();
};
codeq.comms = {
sendActivity: function commsSendActivity (trace, solution, problem_id) {
return Q.Promise(function (resolve, reject, notify) {
var triggerSending = activityKeys.length == 0,
activityDescriptor = activities[problem_id],
problemTrace, promiseResolvers, i;
if (!activityDescriptor) {
problemTrace = [];
promiseResolvers = [];
activityDescriptor = {
'problem_id': problem_id,
'trace': problemTrace,
'solution': solution,
'promiseResolvers': promiseResolvers
};
activities[problem_id] = activityDescriptor;
activityKeys.push(problem_id);
}
else {
problemTrace = activityDescriptor.trace;
promiseResolvers = activityDescriptor.promiseResolvers;
if (solution) activityDescriptor.solution = solution;
}
if (trace instanceof Array) {
for (i = 0; i < trace.length; i++) {
problemTrace.push(trace[i]);
}
}
else {
problemTrace.push(trace);
}
promiseResolvers.push([resolve, reject]);
if (triggerSending) {
setTimeout(sendActivityInternal, 0); // async trigger: see if you can collect some more payload
}
});
},
sendQuery: function commsSendQuery (query, problem_id) {
var existingActivity = activities[problem_id],
tmp;
query['sid'] = codeq.sid;
if (existingActivity) {
tmp = query['trace'];
if (tmp) {
// the trace will be sent separately, so it will be in the proper order
tmp.splice(0, 0, existingActivity.trace.length, 0); // add two parameters in front, they will form the first two parameters to the following splice() invocation
existingActivity.trace.splice.apply(existingActivity.trace, tmp);
delete query['trace'];
}
tmp = query['program'];
if (tmp) existingActivity.solution = tmp;
}
return send('query', query);
},
sendHint: function commsSendHint (json) {
json['sid'] = codeq.sid;
return send('hint', json);
},
sendTest: function commsSendTest (json) {
json['sid'] = codeq.sid;
return send('test', json);
},
getProblem: function commsGetProblem (language, problem_group, problem) {
return send('get_problem', {
'sid': codeq.sid,
'language': language,
'problem_group': problem_group,
'problem': problem
});
}
};
})();
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