| 'use strict'; |
| |
| if (!Array.prototype.includes) |
| Array.prototype.includes = function (value) { return this.indexOf(value) >= 0; } |
| |
| class MeasurementSet { |
| constructor(platformId, metricId, lastModified) |
| { |
| this._platformId = platformId; |
| this._metricId = metricId; |
| this._lastModified = +lastModified; |
| |
| this._sortedClusters = []; |
| this._primaryClusterEndTime = null; |
| this._clusterCount = null; |
| this._clusterStart = null; |
| this._clusterSize = null; |
| this._allFetches = {}; |
| this._callbackMap = new Map; |
| this._primaryClusterPromise = null; |
| this._segmentationCache = new Map; |
| } |
| |
| platformId() { return this._platformId; } |
| metricId() { return this._metricId; } |
| |
| static findSet(platformId, metricId, lastModified) |
| { |
| if (!this._set) |
| this._set = {}; |
| var key = platformId + '-' + metricId; |
| if (!this._set[key]) |
| this._set[key] = new MeasurementSet(platformId, metricId, lastModified); |
| return this._set[key]; |
| } |
| |
| findClusters(startTime, endTime) |
| { |
| var clusterStart = this._clusterStart; |
| var clusterSize = this._clusterSize; |
| |
| var clusters = []; |
| var clusterEnd = clusterStart + Math.floor(Math.max(0, startTime - clusterStart) / clusterSize) * clusterSize; |
| |
| var lastClusterEndTime = this._primaryClusterEndTime; |
| var firstClusterEndTime = lastClusterEndTime - clusterSize * (this._clusterCount - 1); |
| do { |
| clusterEnd += clusterSize; |
| if (firstClusterEndTime <= clusterEnd && clusterEnd <= this._primaryClusterEndTime) |
| clusters.push(clusterEnd); |
| } while (clusterEnd < endTime); |
| |
| return clusters; |
| } |
| |
| fetchBetween(startTime, endTime, callback, noCache) |
| { |
| if (noCache) { |
| this._primaryClusterPromise = null; |
| this._allFetches = {}; |
| } |
| if (!this._primaryClusterPromise) |
| this._primaryClusterPromise = this._fetchPrimaryCluster(noCache); |
| var self = this; |
| this._primaryClusterPromise.catch(callback); |
| return this._primaryClusterPromise.then(function () { |
| self._allFetches[self._primaryClusterEndTime] = self._primaryClusterPromise; |
| return Promise.all(self.findClusters(startTime, endTime).map(function (clusterEndTime) { |
| return self._ensureClusterPromise(clusterEndTime, callback); |
| })); |
| }); |
| } |
| |
| _ensureClusterPromise(clusterEndTime, callback) |
| { |
| if (!this._callbackMap.has(clusterEndTime)) |
| this._callbackMap.set(clusterEndTime, new Set); |
| var callbackSet = this._callbackMap.get(clusterEndTime); |
| callbackSet.add(callback); |
| |
| var promise = this._allFetches[clusterEndTime]; |
| if (promise) |
| promise.then(callback, callback); |
| else { |
| promise = this._fetchSecondaryCluster(clusterEndTime); |
| for (var existingCallback of callbackSet) |
| promise.then(existingCallback, existingCallback); |
| this._allFetches[clusterEndTime] = promise; |
| } |
| |
| return promise; |
| } |
| |
| _constructUrl(useCache, clusterEndTime) |
| { |
| if (!useCache) { |
| return `../api/measurement-set?platform=${this._platformId}&metric=${this._metricId}`; |
| } |
| var url; |
| url = `../data/measurement-set-${this._platformId}-${this._metricId}`; |
| if (clusterEndTime) |
| url += '-' + +clusterEndTime; |
| url += '.json'; |
| return url; |
| } |
| |
| _fetchPrimaryCluster(noCache) |
| { |
| var self = this; |
| if (noCache) { |
| return RemoteAPI.getJSONWithStatus(self._constructUrl(false, null)).then(function (data) { |
| self._didFetchJSON(true, data); |
| }); |
| } |
| |
| return RemoteAPI.getJSONWithStatus(self._constructUrl(true, null)).then(function (data) { |
| if (+data['lastModified'] < self._lastModified) |
| return RemoteAPI.getJSONWithStatus(self._constructUrl(false, null)); |
| return data; |
| }).catch(function (error) { |
| if(error == 404) |
| return RemoteAPI.getJSONWithStatus(self._constructUrl(false, null)); |
| return Promise.reject(error); |
| }).then(function (data) { |
| self._didFetchJSON(true, data); |
| }); |
| } |
| |
| _fetchSecondaryCluster(endTime) |
| { |
| var self = this; |
| return RemoteAPI.getJSONWithStatus(self._constructUrl(true, endTime)).then(function (data) { |
| self._didFetchJSON(false, data); |
| }); |
| } |
| |
| _didFetchJSON(isPrimaryCluster, response, clusterEndTime) |
| { |
| if (isPrimaryCluster) { |
| this._primaryClusterEndTime = response['endTime']; |
| this._clusterCount = response['clusterCount']; |
| this._clusterStart = response['clusterStart']; |
| this._clusterSize = response['clusterSize']; |
| } else |
| console.assert(this._primaryClusterEndTime); |
| |
| this._addFetchedCluster(new MeasurementCluster(response)); |
| } |
| |
| _addFetchedCluster(cluster) |
| { |
| for (var clusterIndex = 0; clusterIndex < this._sortedClusters.length; clusterIndex++) { |
| var startTime = this._sortedClusters[clusterIndex].startTime(); |
| if (cluster.startTime() <= startTime) { |
| this._sortedClusters.splice(clusterIndex, startTime == cluster.startTime() ? 1 : 0, cluster); |
| return; |
| } |
| } |
| this._sortedClusters.push(cluster); |
| } |
| |
| hasFetchedRange(startTime, endTime) |
| { |
| console.assert(startTime < endTime); |
| let foundStart = false; |
| let previousEndTime = null; |
| endTime = Math.min(endTime, this._primaryClusterEndTime); |
| for (var cluster of this._sortedClusters) { |
| const containsStart = cluster.startTime() <= startTime && startTime <= cluster.endTime(); |
| const containsEnd = cluster.startTime() <= endTime && endTime <= cluster.endTime(); |
| const preceedingClusterIsMissing = previousEndTime !== null && previousEndTime != cluster.startTime(); |
| if (containsStart && containsEnd) |
| return true; |
| if (containsStart) |
| foundStart = true; |
| if (foundStart && preceedingClusterIsMissing) |
| return false; |
| if (containsEnd) |
| return foundStart; // Return true iff there were not missing clusters from the one that contains startTime |
| previousEndTime = cluster.endTime(); |
| } |
| return false; // Didn't find a cluster that contains startTime or endTime |
| } |
| |
| fetchedTimeSeries(configType, includeOutliers, extendToFuture) |
| { |
| Instrumentation.startMeasuringTime('MeasurementSet', 'fetchedTimeSeries'); |
| |
| // FIXME: Properly construct TimeSeries. |
| var series = new TimeSeries(); |
| var idMap = {}; |
| for (var cluster of this._sortedClusters) |
| cluster.addToSeries(series, configType, includeOutliers, idMap); |
| |
| if (extendToFuture) |
| series.extendToFuture(); |
| |
| Instrumentation.endMeasuringTime('MeasurementSet', 'fetchedTimeSeries'); |
| |
| return series; |
| } |
| |
| fetchSegmentation(segmentationName, parameters, configType, includeOutliers, extendToFuture) |
| { |
| var cacheMap = this._segmentationCache.get(configType); |
| if (!cacheMap) { |
| cacheMap = new WeakMap; |
| this._segmentationCache.set(configType, cacheMap); |
| } |
| |
| var timeSeries = new TimeSeries; |
| var idMap = {}; |
| var promises = []; |
| for (var cluster of this._sortedClusters) { |
| var clusterStart = timeSeries.length(); |
| cluster.addToSeries(timeSeries, configType, includeOutliers, idMap); |
| var clusterEnd = timeSeries.length(); |
| promises.push(this._cachedClusterSegmentation(segmentationName, parameters, cacheMap, |
| cluster, timeSeries, clusterStart, clusterEnd, idMap)); |
| } |
| if (!timeSeries.length()) |
| return Promise.resolve(null); |
| |
| var self = this; |
| return Promise.all(promises).then(function (clusterSegmentations) { |
| var segmentationSeries = []; |
| var addSegment = function (startingPoint, endingPoint) { |
| var value = Statistics.mean(timeSeries.valuesBetweenRange(startingPoint.seriesIndex, endingPoint.seriesIndex)); |
| segmentationSeries.push({value: value, time: startingPoint.time, seriesIndex: startingPoint.seriesIndex, interval: function () { return null; }}); |
| segmentationSeries.push({value: value, time: endingPoint.time, seriesIndex: endingPoint.seriesIndex, interval: function () { return null; }}); |
| }; |
| |
| var startingIndex = 0; |
| for (var segmentation of clusterSegmentations) { |
| for (var endingIndex of segmentation) { |
| addSegment(timeSeries.findPointByIndex(startingIndex), timeSeries.findPointByIndex(endingIndex)); |
| startingIndex = endingIndex; |
| } |
| } |
| if (extendToFuture) |
| timeSeries.extendToFuture(); |
| addSegment(timeSeries.findPointByIndex(startingIndex), timeSeries.lastPoint()); |
| return segmentationSeries; |
| }); |
| } |
| |
| _cachedClusterSegmentation(segmentationName, parameters, cacheMap, cluster, timeSeries, clusterStart, clusterEnd, idMap) |
| { |
| var cache = cacheMap.get(cluster); |
| if (cache && this._validateSegmentationCache(cache, segmentationName, parameters)) { |
| var segmentationByIndex = new Array(cache.segmentation.length); |
| for (var i = 0; i < cache.segmentation.length; i++) { |
| var id = cache.segmentation[i]; |
| if (!(id in idMap)) |
| return null; |
| segmentationByIndex[i] = idMap[id]; |
| } |
| return Promise.resolve(segmentationByIndex); |
| } |
| |
| var clusterValues = timeSeries.valuesBetweenRange(clusterStart, clusterEnd); |
| return this._invokeSegmentationAlgorithm(segmentationName, parameters, clusterValues).then(function (segmentationInClusterIndex) { |
| // Remove cluster start/end as segmentation points. Otherwise each cluster will be placed into its own segment. |
| var segmentation = segmentationInClusterIndex.slice(1, -1).map(function (index) { return clusterStart + index; }); |
| var cache = segmentation.map(function (index) { return timeSeries.findPointByIndex(index).id; }); |
| cacheMap.set(cluster, {segmentationName: segmentationName, segmentationParameters: parameters.slice(), segmentation: cache}); |
| return segmentation; |
| }); |
| } |
| |
| _validateSegmentationCache(cache, segmentationName, parameters) |
| { |
| if (cache.segmentationName != segmentationName) |
| return false; |
| if (!!cache.segmentationParameters != !!parameters) |
| return false; |
| if (parameters) { |
| if (parameters.length != cache.segmentationParameters.length) |
| return false; |
| for (var i = 0; i < parameters.length; i++) { |
| if (parameters[i] != cache.segmentationParameters[i]) |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| _invokeSegmentationAlgorithm(segmentationName, parameters, timeSeriesValues) |
| { |
| var args = [timeSeriesValues].concat(parameters || []); |
| |
| var timeSeriesIsShortEnoughForSyncComputation = timeSeriesValues.length < 100; |
| if (timeSeriesIsShortEnoughForSyncComputation) { |
| Instrumentation.startMeasuringTime('_invokeSegmentationAlgorithm', 'syncSegmentation'); |
| var segmentation = Statistics[segmentationName].apply(timeSeriesValues, args); |
| Instrumentation.endMeasuringTime('_invokeSegmentationAlgorithm', 'syncSegmentation'); |
| return Promise.resolve(segmentation); |
| } |
| |
| var task = new AsyncTask(segmentationName, args); |
| return task.execute().then(function (response) { |
| Instrumentation.reportMeasurement('_invokeSegmentationAlgorithm', 'workerStartLatency', 'ms', response.startLatency); |
| Instrumentation.reportMeasurement('_invokeSegmentationAlgorithm', 'workerTime', 'ms', response.workerTime); |
| Instrumentation.reportMeasurement('_invokeSegmentationAlgorithm', 'totalTime', 'ms', response.totalTime); |
| return response.result; |
| }); |
| } |
| |
| } |
| |
| if (typeof module != 'undefined') |
| module.exports.MeasurementSet = MeasurementSet; |