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// Copyright 2011 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
goog.provide('goog.stats.BasicStatTest');
goog.setTestOnly('goog.stats.BasicStatTest');
goog.require('goog.array');
goog.require('goog.stats.BasicStat');
goog.require('goog.string.format');
goog.require('goog.testing.PseudoRandom');
goog.require('goog.testing.jsunit');
goog.require('goog.userAgent');
function testGetSlotBoundary() {
var stat = new goog.stats.BasicStat(1654);
assertEquals('Checking interval', 33, stat.slotInterval_);
assertEquals(132, stat.getSlotBoundary_(125));
assertEquals(165, stat.getSlotBoundary_(132));
assertEquals(132, stat.getSlotBoundary_(99));
assertEquals(99, stat.getSlotBoundary_(98));
}
function testCheckForTimeTravel() {
var stat = new goog.stats.BasicStat(1000);
// no slots yet, should always be OK
stat.checkForTimeTravel_(100);
stat.checkForTimeTravel_(-1);
stat.incBy(1, 125); // creates a first bucket, ending at t=140
// Even though these go backwards in time, our basic fuzzy check passes
// because we just check that the time is within the latest interval bucket.
stat.checkForTimeTravel_(141);
stat.checkForTimeTravel_(140);
stat.checkForTimeTravel_(139);
stat.checkForTimeTravel_(125);
stat.checkForTimeTravel_(124);
stat.checkForTimeTravel_(120);
// State should still be the same, all of the above times are valid.
assertEquals('State unchanged when called with good times', 1, stat.get(125));
stat.checkForTimeTravel_(119);
assertEquals('Reset after called with a bad time', 0, stat.get(125));
}
function testConstantIncrementPerSlot() {
var stat = new goog.stats.BasicStat(1000);
var now = 1000;
for (var i = 0; i < 50; ++i) {
var newMax = 1000 + i;
var newMin = 1000 - i;
stat.incBy(newMin, now);
stat.incBy(newMax, now);
var msg = goog.string.format(
'now=%d i=%d newMin=%d newMax=%d', now, i, newMin, newMax);
assertEquals(msg, 2000 * (i + 1), stat.get(now));
assertEquals(msg, newMax, stat.getMax(now));
assertEquals(msg, newMin, stat.getMin(now));
now += 20; // push into the next slots
}
// The next increment should cause old data to fall off.
stat.incBy(1, now);
assertEquals(2000 * 49 + 1, stat.get(now));
assertEquals(1, stat.getMin(now));
assertEquals(1049, stat.getMax(now));
now += 20; // drop off another bucket
stat.incBy(1, now);
assertEquals(2000 * 48 + 2, stat.get(now));
assertEquals(1, stat.getMin(now));
assertEquals(1049, stat.getMax(now));
}
function testSparseBuckets() {
var stat = new goog.stats.BasicStat(1000);
var now = 1000;
stat.incBy(10, now);
assertEquals(10, stat.get(now));
now += 5000; // the old slot is now still in memory, but should be ignored
stat.incBy(1, now);
assertEquals(1, stat.get(now));
}
function testFuzzy() {
var stat = new goog.stats.BasicStat(1000);
var test = new PerfectlySlowStat(1000);
var rand = new goog.testing.PseudoRandom(58849020);
var eventCount = 0;
// test over 5 simulated seconds (2 for IE, due to timeouts)
var simulationDuration = goog.userAgent.IE ? 2000 : 5000;
for (var now = 1000; now < simulationDuration;) {
var count = Math.floor(rand.random() * 2147483648);
var delay = Math.floor(rand.random() * 25);
for (var i = 0; i <= delay; ++i) {
var time = now + i;
var msg = goog.string.format('now=%d eventCount=%d', time, eventCount);
var expected = test.getStats(now + i);
assertEquals(expected.count, stat.get(time));
assertEquals(expected.min, stat.getMin(time));
assertEquals(expected.max, stat.getMax(time));
}
now += delay;
stat.incBy(count, now);
test.incBy(count, now);
eventCount++;
}
}
/**
* A horribly inefficient implementation of BasicStat that stores
* every event in an array and dynamically filters to perform
* aggregations.
* @constructor
*/
var PerfectlySlowStat = function(interval) {
this.interval_ = interval;
this.slotSize_ = Math.floor(interval / goog.stats.BasicStat.NUM_SLOTS_);
this.events_ = [];
};
PerfectlySlowStat.prototype.incBy = function(amt, now) {
this.events_.push({'time': now, 'count': amt});
};
PerfectlySlowStat.prototype.getStats = function(now) {
var end = Math.floor(now / this.slotSize_) * this.slotSize_ + this.slotSize_;
var start = end - this.interval_;
var events =
goog.array.filter(this.events_, function(e) { return e.time >= start });
return {
'count':
goog.array.reduce(events, function(sum, e) { return sum + e.count }, 0),
'min': goog.array.reduce(
events, function(min, e) { return Math.min(min, e.count); },
Number.MAX_VALUE),
'max': goog.array.reduce(
events, function(max, e) { return Math.max(max, e.count); },
Number.MIN_VALUE)
};
};
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