From ee7a3537d1430bcc7e9c4eef5a430bdcf7cfb6ec Mon Sep 17 00:00:00 2001
From: sergey-gerasimov <sergey.gerasimov@exigenservices.com>
Date: Thu, 24 Mar 2016 17:33:08 +0300
Subject: [PATCH] performance edge case. needs to be solved

---
 .../scenarios/computedDiamondUpdate.js        | 110 ++++++++++++++++++
 ...edDiamond1000UpdatesWith500Dependencies.js |   3 +
 2 files changed, 113 insertions(+)
 create mode 100644 performance-tests/scenarios/computedDiamondUpdate.js
 create mode 100644 performance-tests/tests/computedDiamondUpdates/computedDiamond1000UpdatesWith500Dependencies.js

diff --git a/performance-tests/scenarios/computedDiamondUpdate.js b/performance-tests/scenarios/computedDiamondUpdate.js
new file mode 100644
index 0000000..32ed883
--- /dev/null
+++ b/performance-tests/scenarios/computedDiamondUpdate.js
@@ -0,0 +1,110 @@
+var Benchmark = require('benchmark');
+var itDepends = require('../../out/dist/it-depends.js');
+var ko = require('knockout');
+
+module.exports = function(updatesCount, dependenciesCount) {
+	Benchmark.prototype.args = {
+		updatesCount: updatesCount,
+		dependenciesCount: dependenciesCount,
+		ko: ko,
+		itDepends: itDepends
+	};
+
+	Benchmark.prototype.setup = function() {
+		var updatesCount = this.args.updatesCount;
+		var dependenciesCount = this.args.dependenciesCount;
+		var ko = this.args.ko;
+		var itDepends = this.args.itDepends;
+
+		var initialValue = -1;
+
+		function _noop() {
+			return function() {};
+		}
+		
+        function setupKnockout() {
+            var x = [];
+            for (var j = 0; j < dependenciesCount; j++) {
+                x.push(ko.observable(-1));
+            }
+
+            var a = ko.pureComputed(function() {
+                var z = 0;
+                for (var j = 0; j < dependenciesCount; j++) {
+                    z += x[j]();
+                }
+                return z;
+            });
+
+            var b = ko.pureComputed(function() {
+                return a();
+            });
+
+            var c = ko.pureComputed(function() {
+                return a();
+            });
+
+            var d = ko.observable(initialValue);
+
+            var e = ko.pureComputed(function() {
+                return d() % 2 == 0 ? b() : c();
+            });
+            
+            return d;
+        }
+		
+        function setupitDepends() {
+            var x = [];
+            for (var j = 0; j < dependenciesCount; j++) {
+                x.push(itDepends.value(-1));
+            }
+
+            var a = itDepends.computed(function() {
+                var z = 0;
+                for (var j = 0; j < dependenciesCount; j++) {
+                    z += x[j]();
+                }
+                return z;
+            });
+
+            var b = itDepends.computed(function() {
+                return a();
+            });
+
+            var c = itDepends.computed(function() {
+                return a();
+            });
+
+            var d = itDepends.value(-1);
+
+            var e = itDepends.computed(function() {
+                return d() % 2 == 0 ? b() : c();
+            });
+
+            var s = e.onChange(function(){
+                
+            });
+            
+            return d;
+        }
+        
+		var koobservable = setupKnockout();
+		var idobservable = setupitDepends();
+	};
+	
+	var suite = new Benchmark.Suite('computed diamond updated ' + updatesCount + ' times with ' + dependenciesCount + ' hidden dependencies');
+
+	suite.add('knockout', function() {
+		for (var j = 0; j < updatesCount; j++) {
+			koobservable(j);
+		}
+	});
+
+	suite.add('itDepends', function() {
+		for (var j = 0; j < updatesCount; j++) {
+			idobservable.write(j);
+		}
+	});
+
+	return suite;
+};
diff --git a/performance-tests/tests/computedDiamondUpdates/computedDiamond1000UpdatesWith500Dependencies.js b/performance-tests/tests/computedDiamondUpdates/computedDiamond1000UpdatesWith500Dependencies.js
new file mode 100644
index 0000000..877cb7e
--- /dev/null
+++ b/performance-tests/tests/computedDiamondUpdates/computedDiamond1000UpdatesWith500Dependencies.js
@@ -0,0 +1,3 @@
+var computedDiamondUpdate = require('../../scenarios/computedDiamondUpdate');
+
+module.exports = computedDiamondUpdate(1000, 500);
\ No newline at end of file