feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/pidusage/lib/history.js

@@ -0,0 +1,92 @@
+'use strict'
+const DEFAULT_MAXAGE = 60000
+
+const expiration = {}
+const history = {}
+const expireListeners = {}
+
+let size = 0
+let interval = null
+
+function get (pid, maxage) {
+  if (maxage <= 0) {
+    return
+  }
+
+  if (history[pid] !== undefined) {
+    expiration[pid] = Date.now() + (maxage || DEFAULT_MAXAGE)
+  }
+
+  return history[pid]
+}
+
+function set (pid, object, maxage, onExpire) {
+  if (object === undefined || maxage <= 0) return
+
+  expiration[pid] = Date.now() + (maxage || DEFAULT_MAXAGE)
+  if (history[pid] === undefined) {
+    size++
+    sheduleInvalidator(maxage)
+  }
+
+  history[pid] = object
+  if (onExpire) {
+    expireListeners[pid] = onExpire
+  }
+}
+
+function sheduleInvalidator (maxage) {
+  if (size > 0) {
+    if (interval === null) {
+      interval = setInterval(runInvalidator, (maxage || DEFAULT_MAXAGE) / 2)
+      if (typeof interval.unref === 'function') {
+        interval.unref()
+      }
+    }
+
+    return
+  }
+
+  if (interval !== null) {
+    clearInterval(interval)
+    interval = null
+  }
+}
+
+function runInvalidator () {
+  const now = Date.now()
+  const pids = Object.keys(expiration)
+  for (let i = 0; i < pids.length; i++) {
+    const pid = pids[i]
+    if (expiration[pid] < now) {
+      size--
+      if (expireListeners[pid]) {
+        expireListeners[pid](history[pid])
+      }
+
+      delete history[pid]
+      delete expiration[pid]
+      delete expireListeners[pid]
+    }
+  }
+  sheduleInvalidator()
+}
+
+function deleteLoop (obj) { for (const i in obj) { delete obj[i] } }
+
+function clear () {
+  if (interval !== null) {
+    clearInterval(interval)
+    interval = null
+  }
+
+  deleteLoop(history)
+  deleteLoop(expiration)
+  deleteLoop(expireListeners)
+}
+
+module.exports = {
+  get: get,
+  set: set,
+  clear: clear
+}