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/**
* toad-cache
*
* @copyright 2024 Igor Savin <kibertoad@gmail.com>
* @license MIT
* @version 3.7.0
*/
'use strict';
class FifoMap {
constructor(max = 1000, ttlInMsecs = 0) {
if (isNaN(max) || max < 0) {
throw new Error('Invalid max value')
}
if (isNaN(ttlInMsecs) || ttlInMsecs < 0) {
throw new Error('Invalid ttl value')
}
this.first = null;
this.items = new Map();
this.last = null;
this.max = max;
this.ttl = ttlInMsecs;
}
get size() {
return this.items.size
}
clear() {
this.items = new Map();
this.first = null;
this.last = null;
}
delete(key) {
if (this.items.has(key)) {
const deletedItem = this.items.get(key);
this.items.delete(key);
if (deletedItem.prev !== null) {
deletedItem.prev.next = deletedItem.next;
}
if (deletedItem.next !== null) {
deletedItem.next.prev = deletedItem.prev;
}
if (this.first === deletedItem) {
this.first = deletedItem.next;
}
if (this.last === deletedItem) {
this.last = deletedItem.prev;
}
}
}
deleteMany(keys) {
for (var i = 0; i < keys.length; i++) {
this.delete(keys[i]);
}
}
evict() {
if (this.size > 0) {
const item = this.first;
this.items.delete(item.key);
if (this.size === 0) {
this.first = null;
this.last = null;
} else {
this.first = item.next;
this.first.prev = null;
}
}
}
expiresAt(key) {
if (this.items.has(key)) {
return this.items.get(key).expiry
}
}
get(key) {
if (this.items.has(key)) {
const item = this.items.get(key);
if (this.ttl > 0 && item.expiry <= Date.now()) {
this.delete(key);
return
}
return item.value
}
}
getMany(keys) {
const result = [];
for (var i = 0; i < keys.length; i++) {
result.push(this.get(keys[i]));
}
return result
}
keys() {
return this.items.keys()
}
set(key, value) {
// Replace existing item
if (this.items.has(key)) {
const item = this.items.get(key);
item.value = value;
item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;
return
}
// Add new item
if (this.max > 0 && this.size === this.max) {
this.evict();
}
const item = {
expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,
key: key,
prev: this.last,
next: null,
value,
};
this.items.set(key, item);
if (this.size === 1) {
this.first = item;
} else {
this.last.next = item;
}
this.last = item;
}
}
class LruMap {
constructor(max = 1000, ttlInMsecs = 0) {
if (isNaN(max) || max < 0) {
throw new Error('Invalid max value')
}
if (isNaN(ttlInMsecs) || ttlInMsecs < 0) {
throw new Error('Invalid ttl value')
}
this.first = null;
this.items = new Map();
this.last = null;
this.max = max;
this.ttl = ttlInMsecs;
}
get size() {
return this.items.size
}
bumpLru(item) {
if (this.last === item) {
return // Item is already the last one, no need to bump
}
const last = this.last;
const next = item.next;
const prev = item.prev;
if (this.first === item) {
this.first = next;
}
item.next = null;
item.prev = last;
last.next = item;
if (prev !== null) {
prev.next = next;
}
if (next !== null) {
next.prev = prev;
}
this.last = item;
}
clear() {
this.items = new Map();
this.first = null;
this.last = null;
}
delete(key) {
if (this.items.has(key)) {
const item = this.items.get(key);
this.items.delete(key);
if (item.prev !== null) {
item.prev.next = item.next;
}
if (item.next !== null) {
item.next.prev = item.prev;
}
if (this.first === item) {
this.first = item.next;
}
if (this.last === item) {
this.last = item.prev;
}
}
}
deleteMany(keys) {
for (var i = 0; i < keys.length; i++) {
this.delete(keys[i]);
}
}
evict() {
if (this.size > 0) {
const item = this.first;
this.items.delete(item.key);
if (this.size === 0) {
this.first = null;
this.last = null;
} else {
this.first = item.next;
this.first.prev = null;
}
}
}
expiresAt(key) {
if (this.items.has(key)) {
return this.items.get(key).expiry
}
}
get(key) {
if (this.items.has(key)) {
const item = this.items.get(key);
// Item has already expired
if (this.ttl > 0 && item.expiry <= Date.now()) {
this.delete(key);
return
}
// Item is still fresh
this.bumpLru(item);
return item.value
}
}
getMany(keys) {
const result = [];
for (var i = 0; i < keys.length; i++) {
result.push(this.get(keys[i]));
}
return result
}
keys() {
return this.items.keys()
}
set(key, value) {
// Replace existing item
if (this.items.has(key)) {
const item = this.items.get(key);
item.value = value;
item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;
if (this.last !== item) {
this.bumpLru(item);
}
return
}
// Add new item
if (this.max > 0 && this.size === this.max) {
this.evict();
}
const item = {
expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,
key: key,
prev: this.last,
next: null,
value,
};
this.items.set(key, item);
if (this.size === 1) {
this.first = item;
} else {
this.last.next = item;
}
this.last = item;
}
}
class LruObject {
constructor(max = 1000, ttlInMsecs = 0) {
if (isNaN(max) || max < 0) {
throw new Error('Invalid max value')
}
if (isNaN(ttlInMsecs) || ttlInMsecs < 0) {
throw new Error('Invalid ttl value')
}
this.first = null;
this.items = Object.create(null);
this.last = null;
this.size = 0;
this.max = max;
this.ttl = ttlInMsecs;
}
bumpLru(item) {
if (this.last === item) {
return // Item is already the last one, no need to bump
}
const last = this.last;
const next = item.next;
const prev = item.prev;
if (this.first === item) {
this.first = next;
}
item.next = null;
item.prev = last;
last.next = item;
if (prev !== null) {
prev.next = next;
}
if (next !== null) {
next.prev = prev;
}
this.last = item;
}
clear() {
this.items = Object.create(null);
this.first = null;
this.last = null;
this.size = 0;
}
delete(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const item = this.items[key];
delete this.items[key];
this.size--;
if (item.prev !== null) {
item.prev.next = item.next;
}
if (item.next !== null) {
item.next.prev = item.prev;
}
if (this.first === item) {
this.first = item.next;
}
if (this.last === item) {
this.last = item.prev;
}
}
}
deleteMany(keys) {
for (var i = 0; i < keys.length; i++) {
this.delete(keys[i]);
}
}
evict() {
if (this.size > 0) {
const item = this.first;
delete this.items[item.key];
if (--this.size === 0) {
this.first = null;
this.last = null;
} else {
this.first = item.next;
this.first.prev = null;
}
}
}
expiresAt(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
return this.items[key].expiry
}
}
get(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const item = this.items[key];
// Item has already expired
if (this.ttl > 0 && item.expiry <= Date.now()) {
this.delete(key);
return
}
// Item is still fresh
this.bumpLru(item);
return item.value
}
}
getMany(keys) {
const result = [];
for (var i = 0; i < keys.length; i++) {
result.push(this.get(keys[i]));
}
return result
}
keys() {
return Object.keys(this.items)
}
set(key, value) {
// Replace existing item
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const item = this.items[key];
item.value = value;
item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;
if (this.last !== item) {
this.bumpLru(item);
}
return
}
// Add new item
if (this.max > 0 && this.size === this.max) {
this.evict();
}
const item = {
expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,
key: key,
prev: this.last,
next: null,
value,
};
this.items[key] = item;
if (++this.size === 1) {
this.first = item;
} else {
this.last.next = item;
}
this.last = item;
}
}
class HitStatisticsRecord {
constructor() {
this.records = {};
}
initForCache(cacheId, currentTimeStamp) {
this.records[cacheId] = {
[currentTimeStamp]: {
cacheSize: 0,
hits: 0,
falsyHits: 0,
emptyHits: 0,
misses: 0,
expirations: 0,
evictions: 0,
invalidateOne: 0,
invalidateAll: 0,
sets: 0,
},
};
}
resetForCache(cacheId) {
for (let key of Object.keys(this.records[cacheId])) {
this.records[cacheId][key] = {
cacheSize: 0,
hits: 0,
falsyHits: 0,
emptyHits: 0,
misses: 0,
expirations: 0,
evictions: 0,
invalidateOne: 0,
invalidateAll: 0,
sets: 0,
};
}
}
getStatistics() {
return this.records
}
}
/**
*
* @param {Date} date
* @returns {string}
*/
function getTimestamp(date) {
return `${date.getFullYear()}-${(date.getMonth() + 1).toString().padStart(2, '0')}-${date
.getDate()
.toString()
.padStart(2, '0')}`
}
class HitStatistics {
constructor(cacheId, statisticTtlInHours, globalStatisticsRecord) {
this.cacheId = cacheId;
this.statisticTtlInHours = statisticTtlInHours;
this.collectionStart = new Date();
this.currentTimeStamp = getTimestamp(this.collectionStart);
this.records = globalStatisticsRecord || new HitStatisticsRecord();
this.records.initForCache(this.cacheId, this.currentTimeStamp);
}
get currentRecord() {
// safety net
/* c8 ignore next 14 */
if (!this.records.records[this.cacheId][this.currentTimeStamp]) {
this.records.records[this.cacheId][this.currentTimeStamp] = {
cacheSize: 0,
hits: 0,
falsyHits: 0,
emptyHits: 0,
misses: 0,
expirations: 0,
evictions: 0,
sets: 0,
invalidateOne: 0,
invalidateAll: 0,
};
}
return this.records.records[this.cacheId][this.currentTimeStamp]
}
hoursPassed() {
return (Date.now() - this.collectionStart) / 1000 / 60 / 60
}
addHit() {
this.archiveIfNeeded();
this.currentRecord.hits++;
}
addFalsyHit() {
this.archiveIfNeeded();
this.currentRecord.falsyHits++;
}
addEmptyHit() {
this.archiveIfNeeded();
this.currentRecord.emptyHits++;
}
addMiss() {
this.archiveIfNeeded();
this.currentRecord.misses++;
}
addEviction() {
this.archiveIfNeeded();
this.currentRecord.evictions++;
}
setCacheSize(currentSize) {
this.archiveIfNeeded();
this.currentRecord.cacheSize = currentSize;
}
addExpiration() {
this.archiveIfNeeded();
this.currentRecord.expirations++;
}
addSet() {
this.archiveIfNeeded();
this.currentRecord.sets++;
}
addInvalidateOne() {
this.archiveIfNeeded();
this.currentRecord.invalidateOne++;
}
addInvalidateAll() {
this.archiveIfNeeded();
this.currentRecord.invalidateAll++;
}
getStatistics() {
return this.records.getStatistics()
}
archiveIfNeeded() {
if (this.hoursPassed() >= this.statisticTtlInHours) {
this.collectionStart = new Date();
this.currentTimeStamp = getTimestamp(this.collectionStart);
this.records.initForCache(this.cacheId, this.currentTimeStamp);
}
}
}
class LruObjectHitStatistics extends LruObject {
constructor(max, ttlInMsecs, cacheId, globalStatisticsRecord, statisticTtlInHours) {
super(max || 1000, ttlInMsecs || 0);
if (!cacheId) {
throw new Error('Cache id is mandatory')
}
this.hitStatistics = new HitStatistics(
cacheId,
statisticTtlInHours !== undefined ? statisticTtlInHours : 24,
globalStatisticsRecord,
);
}
getStatistics() {
return this.hitStatistics.getStatistics()
}
set(key, value) {
super.set(key, value);
this.hitStatistics.addSet();
this.hitStatistics.setCacheSize(this.size);
}
evict() {
super.evict();
this.hitStatistics.addEviction();
this.hitStatistics.setCacheSize(this.size);
}
delete(key, isExpiration = false) {
super.delete(key);
if (!isExpiration) {
this.hitStatistics.addInvalidateOne();
}
this.hitStatistics.setCacheSize(this.size);
}
clear() {
super.clear();
this.hitStatistics.addInvalidateAll();
this.hitStatistics.setCacheSize(this.size);
}
get(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const item = this.items[key];
// Item has already expired
if (this.ttl > 0 && item.expiry <= Date.now()) {
this.delete(key, true);
this.hitStatistics.addExpiration();
return
}
// Item is still fresh
this.bumpLru(item);
if (!item.value) {
this.hitStatistics.addFalsyHit();
}
if (item.value === undefined || item.value === null || item.value === '') {
this.hitStatistics.addEmptyHit();
}
this.hitStatistics.addHit();
return item.value
}
this.hitStatistics.addMiss();
}
}
class FifoObject {
constructor(max = 1000, ttlInMsecs = 0) {
if (isNaN(max) || max < 0) {
throw new Error('Invalid max value')
}
if (isNaN(ttlInMsecs) || ttlInMsecs < 0) {
throw new Error('Invalid ttl value')
}
this.first = null;
this.items = Object.create(null);
this.last = null;
this.size = 0;
this.max = max;
this.ttl = ttlInMsecs;
}
clear() {
this.items = Object.create(null);
this.first = null;
this.last = null;
this.size = 0;
}
delete(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const deletedItem = this.items[key];
delete this.items[key];
this.size--;
if (deletedItem.prev !== null) {
deletedItem.prev.next = deletedItem.next;
}
if (deletedItem.next !== null) {
deletedItem.next.prev = deletedItem.prev;
}
if (this.first === deletedItem) {
this.first = deletedItem.next;
}
if (this.last === deletedItem) {
this.last = deletedItem.prev;
}
}
}
deleteMany(keys) {
for (var i = 0; i < keys.length; i++) {
this.delete(keys[i]);
}
}
evict() {
if (this.size > 0) {
const item = this.first;
delete this.items[item.key];
if (--this.size === 0) {
this.first = null;
this.last = null;
} else {
this.first = item.next;
this.first.prev = null;
}
}
}
expiresAt(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
return this.items[key].expiry
}
}
get(key) {
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const item = this.items[key];
if (this.ttl > 0 && item.expiry <= Date.now()) {
this.delete(key);
return
}
return item.value
}
}
getMany(keys) {
const result = [];
for (var i = 0; i < keys.length; i++) {
result.push(this.get(keys[i]));
}
return result
}
keys() {
return Object.keys(this.items)
}
set(key, value) {
// Replace existing item
if (Object.prototype.hasOwnProperty.call(this.items, key)) {
const item = this.items[key];
item.value = value;
item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;
return
}
// Add new item
if (this.max > 0 && this.size === this.max) {
this.evict();
}
const item = {
expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,
key: key,
prev: this.last,
next: null,
value,
};
this.items[key] = item;
if (++this.size === 1) {
this.first = item;
} else {
this.last.next = item;
}
this.last = item;
}
}
exports.Fifo = FifoObject;
exports.FifoMap = FifoMap;
exports.FifoObject = FifoObject;
exports.HitStatisticsRecord = HitStatisticsRecord;
exports.Lru = LruObject;
exports.LruHitStatistics = LruObjectHitStatistics;
exports.LruMap = LruMap;
exports.LruObject = LruObject;
exports.LruObjectHitStatistics = LruObjectHitStatistics;