what

quality.coffee

+assert = require 'assert'
+
+module.exports = class Quality
+  constructor: (@delay=0, @jitter=0, @reliability=1, @cost=0)->
+
+  @unreachable: new Quality(0,0,0,0)
+
+
+  concat: (delay, jitter, reliability, cost)->
+    if delay instanceof Quality
+      @concat(delay.delay, delay.jitter, delay.reliability, delay.cost)
+    else
+      @delay += delay
+      @jitter += jitter
+      @reliability *= reliability
+      @cost += cost
+    this
+
+  # 若 reliability = 0，metric 应为 +∞
+  # 对于两条路线，同时连接任何一个相同的(reliability > 0的)线路，大小关系不变
+  metric: ()->
+    assert(@jitter >= 0)
+    assert(0 <= @reliability <= 1)
+    assert(@cost >= 0)
+    if @reliability == 0
+      Number.POSITIVE_INFINITY
+    else
+      @delay + (1 - @reliability) * 6 + @cost * 0.1

quality.js

+// Generated by CoffeeScript 1.9.3
+(function() {
+  var Quality, assert;
+
+  assert = require('assert');
+
+  module.exports = Quality = (function() {
+    function Quality(delay1, jitter1, reliability1, cost1) {
+      this.delay = delay1 != null ? delay1 : 0;
+      this.jitter = jitter1 != null ? jitter1 : 0;
+      this.reliability = reliability1 != null ? reliability1 : 1;
+      this.cost = cost1 != null ? cost1 : 0;
+    }
+
+    Quality.unreachable = new Quality(0, 0, 0, 0);
+
+    Quality.prototype.concat = function(delay, jitter, reliability, cost) {
+      if (delay instanceof Quality) {
+        this.concat(delay.delay, delay.jitter, delay.reliability, delay.cost);
+      } else {
+        this.delay += delay;
+        this.jitter += jitter;
+        this.reliability *= reliability;
+        this.cost += cost;
+      }
+      return this;
+    };
+
+    Quality.prototype.metric = function() {
+      var ref;
+      assert(this.jitter >= 0);
+      assert((0 <= (ref = this.reliability) && ref <= 1));
+      assert(this.cost >= 0);
+      if (this.reliability === 0) {
+        return Number.POSITIVE_INFINITY;
+      } else {
+        return this.delay + (1 - this.reliability) * 6 + this.cost * 0.1;
+      }
+    };
+
+    return Quality;
+
+  })();
+
+}).call(this);
+
+//# sourceMappingURL=quality.js.map

quality.js.map

+{
+  "version": 3,
+  "file": "quality.js",
+  "sourceRoot": "",
+  "sources": [
+    "quality.coffee"
+  ],
+  "names": [],
+  "mappings": ";AAAA;AAAA,MAAA;;EAAA,MAAA,GAAS,OAAA,CAAQ,QAAR;;EAET,MAAM,CAAC,OAAP,GAAuB;IACR,iBAAC,MAAD,EAAW,OAAX,EAAsB,YAAtB,EAAsC,KAAtC;MAAC,IAAC,CAAA,yBAAD,SAAO;MAAG,IAAC,CAAA,2BAAD,UAAQ;MAAG,IAAC,CAAA,qCAAD,eAAa;MAAG,IAAC,CAAA,uBAAD,QAAM;IAA5C;;IAEb,OAAC,CAAA,WAAD,GAAkB,IAAA,OAAA,CAAQ,CAAR,EAAU,CAAV,EAAY,CAAZ,EAAc,CAAd;;sBAGlB,MAAA,GAAQ,SAAC,KAAD,EAAQ,MAAR,EAAgB,WAAhB,EAA6B,IAA7B;MACN,IAAG,KAAA,YAAiB,OAApB;QACE,IAAC,CAAA,MAAD,CAAQ,KAAK,CAAC,KAAd,EAAqB,KAAK,CAAC,MAA3B,EAAmC,KAAK,CAAC,WAAzC,EAAsD,KAAK,CAAC,IAA5D,EADF;OAAA,MAAA;QAGE,IAAC,CAAA,KAAD,IAAU;QACV,IAAC,CAAA,MAAD,IAAW;QACX,IAAC,CAAA,WAAD,IAAgB;QAChB,IAAC,CAAA,IAAD,IAAS,KANX;;aAOA;IARM;;sBAYR,MAAA,GAAQ,SAAA;AACN,UAAA;MAAA,MAAA,CAAO,IAAC,CAAA,MAAD,IAAW,CAAlB;MACA,MAAA,CAAO,CAAA,CAAA,WAAK,IAAC,CAAA,YAAN,OAAA,IAAqB,CAArB,CAAP;MACA,MAAA,CAAO,IAAC,CAAA,IAAD,IAAS,CAAhB;MACA,IAAG,IAAC,CAAA,WAAD,KAAgB,CAAnB;eACE,MAAM,CAAC,kBADT;OAAA,MAAA;eAGE,IAAC,CAAA,KAAD,GAAS,CAAC,CAAA,GAAI,IAAC,CAAA,WAAN,CAAA,GAAqB,CAA9B,GAAkC,IAAC,CAAA,IAAD,GAAQ,IAH5C;;IAJM;;;;;AApBV"
+}
\ No newline at end of file