// CatalogAPI is a object that contains two methods for data retrieving
var CatalogAPI = {
// Returns a promise. When it resolves, it returns an array of arrays, containing category data.
getCategories: function () {
return new Promise(function (resolve) {
var categoriesData = [[1, 'device', 'http', 'HTTP'],
[2, 'device', 'dns', 'DNS'],
[3, 'application', 'ldap', 'LDAP'],
[4, 'application', 'mongo', 'MongoDB']];
resolve(categoriesData);
});
},
// Returns a promise. When it resolves, it returns an array of arrays, containing metric data.
getMetrics: function () {
return new Promise(function (resolve) {
var metricsData = [[1, 1, 'req', 'Requests'],
[2, 1, 'rsp', 'Responses'],
[3, 1, 'tprocess', 'Server Processing Time'],
[4, 2, 'req', 'Requests'],
[5, 2, 'rsp', 'Responses'],
[6, 2, 'trunc', 'Truncated Responses'],
[7, 3, 'plain', 'Plain Text Messages'],
[8, 3, 'sasl', 'SASL Messages'],
[9, 3, 'error', 'Errors'],
[10, 4, 'req', 'Requests'],
[11, 4, 'rsp', 'Responses'],
[12, 4, 'tprocess', 'Server Processing Time']];
resolve(metricsData);
});
}
};
/* custom constructor that creates a Category object
parameters: categoryData, an array containing category data in the following order:
[0] = ID, [1] = objectType, [2] = statName, [3] = displayName
*/
function Category(categoryData) {
this.ID = categoryData[0];
this.objectType = categoryData[1];
this.statName = categoryData[2];
this.displayName = categoryData[3];
};
/* custom constructor that creates a Metric object
parameters: metricData, an array containing metric data in the following order:
[0] = ID, [1] = categoryID, [2] = fieldName, [3] = displayName
*/
function Metric(metricData) {
this.ID = metricData[0];
this.categoryID = metricData[1];
this.fieldName = metricData[2];
this.displayName = metricData[3];
};
/* custom contructor that creates a Catalog object
attributes: initilized --> indicates if the object Catalog has been initialized already, set to false when first created
categories --> contains the categories data downloaded thru the CatalogAPI, set to empty when first created
metrics --> contains the metrics data downloaded thru the CatalogAPI, set to empty when first created
methods: getCategoryByID(ID)
getCategoryByStatString(statString)
getMetricByID(ID)
getMetricByStatString(statString)
initialize()
*/
function Catalog() {
this.initialized = false;
this.categories = [];
this.metrics = [];
/* searches the categories to check if a category matches a given ID,
if found, it returns a Category object with the found category's attributes
else, it returns a Category object with null attributes
*/
this.getCategoryByID = function (ID) {
var categoryObj = new Category([null, null, null, null]);
for (var i = 0; i < this.categories.length; i++) {
if (this.categories[i][0] === ID) {
categoryObj = new Category(this.categories[i]);
}
}
return categoryObj;
};
/* searches the categories to check if a category matches a given statString,
if found, it returns a Category object with the found category's attributes
else, it returns a Category object with null attributes
*/
this.getCategoryByStatString = function (statString) {
var categoryObj = new Category([null, null, null, null]);
var splittedStatString = statString.split(".");
for (var i = 0; i < this.categories.length; i++) {
if ((this.categories[i][1] === splittedStatString[1]) &&
(this.categories[i][2] === splittedStatString[2])) {
categoryObj = new Category(this.categories[i]);
}
}
return categoryObj;
};
/* searches the metrics to check if a metric matches a given ID,
if found, it returns a Metric object with the found metric's attributes
else, it returns a Metric object with null attributes
*/
this.getMetricByID = function (ID) {
var metricObj = new Metric([null, null, null, null]);
for (var i = 0; i < this.metrics.length; i++) {
if (this.metrics[i][0] === ID) {
metricObj = new Metric(this.metrics[i]);
}
}
return metricObj;
};
/* searches the metrics to check if a metric matches a given statString,
if found, it returns a Metric object with the found metric's attributes
else, it returns a Metric object with null attributes
*/
this.getMetricByStatString = function (statString) {
var metricObj = new Metric([null, null, null, null]);
// method getCategoryByStatString is called to identify the cateogry that the metric belongs to
var splittedStatString = statString.split(":");
var categoryObj = this.getCategoryByStatString(splittedStatString[0]);
// once the metric's cateogry is known, the metric is found by searching for categoryID and fieldName
for (var i = ((categoryObj.ID - 1) * 3) ; i < (categoryObj.ID * 3) ; i++) {
if (this.metrics[i][2] === splittedStatString[1]) {
metricObj = new Metric(this.metrics[i]);
}
}
return metricObj;
};
/* it returns a promise when the Catalog is ready to use,
if the catalog data was already downloaded, it does not downloads the data again
*/
this.initialize = function () {
// reference to catalog class, so that refering to catalog inside functions is easier
var catalogReference = this;
/* if initialized === true, then do not download catalog data,
just return promise acknowloging that the Catalog is ready to be use */
if (catalogReference.initialized) {
return new Promise(function (resolve) {
resolve();
});
}
/* if initialized === false, then download the catalog
data by calling the CatalogAPI methods */
else {
var categoriesData = CatalogAPI.getCategories();
var metricsData = CatalogAPI.getMetrics();
var dataReady = Promise.all([categoriesData, metricsData]).then(function (catalogData) {
catalogReference.categories = catalogData[0];
catalogReference.metrics = catalogData[1];
});
catalogReference.initialized = true;
return dataReady;
}
};
};
var c = new Catalog();
c.initialize().then(function () {
var category1, category2, metric1, metric2;
// Test category lookups
category1 = c.getCategoryByID(1);
category2 = c.getCategoryByStatString('extrahop.device.http');
if (category1.ID === category2.ID) {
console.log(category1.displayName + ' lookups match!');
}
// Test metric lookups
metric1 = c.getMetricByID(12);
metric2 = c.getMetricByStatString('extrahop.application.mongo:tprocess');
if (metric1.ID === metric2.ID) {
console.log(metric1.displayName + ' lookups match!');
}
});
方法getMetricBySatString（statString）有一个参数，它是一个包含来自categoriesData数组的2个属性和一个来自metricData的字符串，它应该在O（1）中完成，任何关于如何实现的想法要做到这一点？
感谢。