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var async = require('../lib');
var expect = require('chai').expect;
describe('priorityQueue', function() {
it('priorityQueue', function (done) {
var call_order = [];
// order of completion: 2,1,4,3
var q = async.priorityQueue(function (task, callback) {
call_order.push('process ' + task);
callback('error', 'arg');
}, 1);
q.push(1, 1.4, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(2);
call_order.push('callback ' + 1);
});
q.push(2, 0.2, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(3);
call_order.push('callback ' + 2);
});
q.push(3, 3.8, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(0);
call_order.push('callback ' + 3);
});
q.push(4, 2.9, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(1);
call_order.push('callback ' + 4);
});
expect(q.length()).to.equal(4);
expect(q.concurrency).to.equal(1);
q.drain = function () {
expect(call_order).to.eql([
'process 2', 'callback 2',
'process 1', 'callback 1',
'process 4', 'callback 4',
'process 3', 'callback 3'
]);
expect(q.concurrency).to.equal(1);
expect(q.length()).to.equal(0);
done();
};
});
it('concurrency', function (done) {
var call_order = [],
delays = [160,80,240,80];
// worker1: --2-3
// worker2: -1---4
// order of completion: 1,2,3,4
var q = async.priorityQueue(function (task, callback) {
setTimeout(function () {
call_order.push('process ' + task);
callback('error', 'arg');
}, delays.splice(0,1)[0]);
}, 2);
q.push(1, 1.4, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(2);
call_order.push('callback ' + 1);
});
q.push(2, 0.2, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(1);
call_order.push('callback ' + 2);
});
q.push(3, 3.8, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(0);
call_order.push('callback ' + 3);
});
q.push(4, 2.9, function (err, arg) {
expect(err).to.equal('error');
expect(arg).to.equal('arg');
expect(q.length()).to.equal(0);
call_order.push('callback ' + 4);
});
expect(q.length()).to.equal(4);
expect(q.concurrency).to.equal(2);
q.drain = function () {
expect(call_order).to.eql([
'process 1', 'callback 1',
'process 2', 'callback 2',
'process 3', 'callback 3',
'process 4', 'callback 4'
]);
expect(q.concurrency).to.equal(2);
expect(q.length()).to.equal(0);
done();
};
});
context('q.saturated(): ', function() {
it('should call the saturated callback if tasks length is concurrency', function(done) {
var calls = [];
var q = async.priorityQueue(function(task, cb) {
calls.push('process ' + task);
async.setImmediate(cb);
}, 4);
q.saturated = function() {
calls.push('saturated');
};
q.empty = function() {
expect(calls.indexOf('saturated')).to.be.above(-1);
setTimeout(function() {
expect(calls).eql([
'process foo4',
'process foo3',
'process foo2',
"saturated",
'process foo1',
'foo4 cb',
"saturated",
'process foo0',
'foo3 cb',
'foo2 cb',
'foo1 cb',
'foo0 cb'
]);
done();
}, 50);
};
q.push('foo0', 5, function () {calls.push('foo0 cb');});
q.push('foo1', 4, function () {calls.push('foo1 cb');});
q.push('foo2', 3, function () {calls.push('foo2 cb');});
q.push('foo3', 2, function () {calls.push('foo3 cb');});
q.push('foo4', 1, function () {calls.push('foo4 cb');});
});
});
context('q.unsaturated(): ',function() {
it('should have a default buffer property that equals 25% of the concurrenct rate', function(done) {
var calls = [];
var q = async.priorityQueue(function(task, cb) {
// nop
calls.push('process ' + task);
async.setImmediate(cb);
}, 10);
expect(q.buffer).to.equal(2.5);
done();
});
it('should allow a user to change the buffer property', function(done) {
var calls = [];
var q = async.priorityQueue(function(task, cb) {
// nop
calls.push('process ' + task);
async.setImmediate(cb);
}, 10);
q.buffer = 4;
expect(q.buffer).to.not.equal(2.5);
expect(q.buffer).to.equal(4);
done();
});
it('should call the unsaturated callback if tasks length is less than concurrency minus buffer', function(done) {
var calls = [];
var q = async.priorityQueue(function(task, cb) {
calls.push('process ' + task);
setTimeout(cb, 10);
}, 4);
q.unsaturated = function() {
calls.push('unsaturated');
};
q.empty = function() {
expect(calls.indexOf('unsaturated')).to.be.above(-1);
setTimeout(function() {
expect(calls).eql([
'process foo4',
'process foo3',
'process foo2',
'process foo1',
'foo4 cb',
'unsaturated',
'process foo0',
'foo3 cb',
'unsaturated',
'foo2 cb',
'unsaturated',
'foo1 cb',
'unsaturated',
'foo0 cb',
'unsaturated'
]);
done();
}, 50);
};
q.push('foo0', 5, function () {calls.push('foo0 cb');});
q.push('foo1', 4, function () {calls.push('foo1 cb');});
q.push('foo2', 3, function () {calls.push('foo2 cb');});
q.push('foo3', 2, function () {calls.push('foo3 cb');});
q.push('foo4', 1, function () {calls.push('foo4 cb');});
});
});
});
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