test_backoff.js - mozsearch

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// Some unittests (e.g., paste into JS shell)

var jslib =

  Cc["@mozilla.org/url-classifier/jslib;1"].getService().wrappedJSObject;

var jslibDate = Cu.getGlobalForObject(jslib).Date;

var _Datenow = jslibDate.now;

function setNow(time) {

  jslibDate.now = function () {

    return time;

};

function run_test() {

  // 3 errors, 1ms retry period, max 3 requests per ten milliseconds,

  // 5ms backoff interval, 19ms max delay

  var rb = new jslib.RequestBackoff(3, 1, 3, 10, 5, 19, 0);

  setNow(1);

  rb.noteServerResponse(200);

  Assert.ok(rb.canMakeRequest());

  setNow(2);

  Assert.ok(rb.canMakeRequest());

  // First error should trigger a 1ms delay

  rb.noteServerResponse(500);

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 3);

  setNow(3);

  Assert.ok(rb.canMakeRequest());

  // Second error should also trigger a 1ms delay

  rb.noteServerResponse(500);

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 4);

  setNow(4);

  Assert.ok(rb.canMakeRequest());

  // Third error should trigger a 5ms backoff

  rb.noteServerResponse(500);

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 9);

  setNow(9);

  Assert.ok(rb.canMakeRequest());

  // Trigger backoff again

  rb.noteServerResponse(503);

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 19);

  setNow(19);

  Assert.ok(rb.canMakeRequest());

  // Trigger backoff a third time and hit max timeout

  rb.noteServerResponse(302);

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 38);

  setNow(38);

  Assert.ok(rb.canMakeRequest());

  // One more backoff, should still be at the max timeout

  rb.noteServerResponse(400);

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 57);

  setNow(57);

  Assert.ok(rb.canMakeRequest());

  // Request goes through

  rb.noteServerResponse(200);

  Assert.ok(rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 0);

  setNow(58);

  rb.noteServerResponse(500);

  // Another error, should trigger a 1ms backoff

  Assert.ok(!rb.canMakeRequest());

  Assert.equal(rb.nextRequestTime_, 59);

  setNow(59);

  Assert.ok(rb.canMakeRequest());

  setNow(200);

  rb.noteRequest();

  setNow(201);

  rb.noteRequest();

  setNow(202);

  Assert.ok(rb.canMakeRequest());

  rb.noteRequest();

  Assert.ok(!rb.canMakeRequest());

  setNow(211);

  Assert.ok(rb.canMakeRequest());

  jslibDate.now = _Datenow;