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2013-02-11T11:03:56.983
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Thanks @James, I got clue from what you edited for length. As such the calls are async ajax requests. So the idea is in creating M number of async calls upfront. Then they will continue those many as and when each one is complete. I did experiment with nodejs and following initiateChain works as intended <pre><code>var calls = []; function initiateChain() { var i = 0; var maxSteams = 2; var tasks = arguments; var callback = function () { i += 1; if (i < tasks.length) { tasks[i](callback); //block should call callback when done otherwise loop stops } } if (tasks.length) { i = ((tasks.length > maxSteams) ? maxSteams : tasks.length) - 1; for (var j = 0; j < maxSteams; j+=1) { if (j < tasks.length) { tasks[j](callback); //initiate first set } else { break; } } } } //test methods for(var k = 0; k < 8; k+=1 ) { calls[k] = (function (message, index) { return function (callback) { var ts = new Date().getTime(); console.log(message + " started - " + ts); setTimeout(function() { ts = new Date().getTime(); console.log(message + " completed - " + ts); callback(); }, index * 1000); }; })("call" + (k+1), (k+1)) } initiateChain(calls[0], calls[1], calls[2], calls[3], calls[4], calls[5], calls[6], calls[7]); </code></pre> In my experiment I got following results <pre><code>call1 started - 1360580377905 call2 started - 1360580377926 call1 completed - 1360580378937 call3 started - 1360580378937 call2 completed - 1360580379937 call4 started - 1360580379937 call3 completed - 1360580381945 call5 started - 1360580381945 call4 completed - 1360580383946 call6 started - 1360580383946 call5 completed - 1360580386959 call7 started - 1360580386959 call6 completed - 1360580389950 call8 started - 1360580389950 call7 completed - 1360580393972 call8 completed - 1360580397959 </code></pre>
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