Created
July 13, 2013 16:13
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readylist
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var ready = require('./ready'); | |
var cdCache = {}; | |
function getDiskData (discId) { | |
cdCache[discId] = cdCache[discId] || ready(function (done) { | |
setTimeout(function () { | |
done(Math.random()); | |
}, 2000); | |
}); | |
cdCache[discId].add(function () { | |
console.log.call(this, arguments); | |
}); | |
} | |
setInterval(function () { | |
getDiskData("10"); // 10 is a disc id | |
}, 500); |
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module.exports = ready; | |
function ready (get) { | |
var queue = [], | |
results, | |
state = 'waiting'; | |
function completeQueue () { | |
while (queue.length > 0) { | |
queue.shift().apply(null, results); | |
} | |
} | |
return { | |
add: function (done) { | |
queue.push(done); | |
if (state === 'waiting') { | |
state = 'running'; | |
get(function () { | |
state = 'ready'; | |
results = arguments; | |
completeQueue(); | |
}); | |
} else if (state == 'ready') { | |
completeQueue(); | |
} | |
} | |
} | |
} |
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