Initial delivery of metrics code (#81)

* Initial delivery of metrics code

* Fix build issues

* Fix build issue with go vet

internal/metrics/update_test.go

@@ -0,0 +1,112 @@
+/*
+© Copyright IBM Corporation 2018
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package metrics
+
+import (
+	"testing"
+
+	"github.com/ibm-messaging/mq-golang/mqmetric"
+)
+
+func TestInitialiseMetrics(t *testing.T) {
+
+	teardownTestCase := setupTestCase()
+	defer teardownTestCase()
+
+	metrics := initialiseMetrics()
+	metric, ok := metrics["ClassName/Type1Name/Element1Name"]
+
+	if !ok {
+		t.Error("Expected metric not found in map")
+	} else {
+		if metric.name != "Element1Name" {
+			t.Errorf("Expected name=%s; actual %s", "Element1Name", metric.name)
+		}
+		if metric.description != "Element1Description" {
+			t.Errorf("Expected description=%s; actual %s", "Element1Description", metric.description)
+		}
+		if metric.objectType != false {
+			t.Errorf("Expected objectType=%v; actual %v", false, metric.objectType)
+		}
+		if len(metric.values) != 0 {
+			t.Errorf("Expected values-size=%d; actual %d", 0, len(metric.values))
+		}
+	}
+	_, ok = metrics["ClassName/Type2Name/Element2Name"]
+	if ok {
+		t.Errorf("Unexpected metric found in map, %%s object topics should be ignored")
+	}
+
+	if len(metrics) != 1 {
+		t.Errorf("Map contains unexpected metrics, map size=%d", len(metrics))
+	}
+}
+
+func TestMakeKey(t *testing.T) {
+
+	teardownTestCase := setupTestCase()
+	defer teardownTestCase()
+
+	expected := "ClassName/Type1Name/Element1Name"
+	actual := makeKey(mqmetric.Metrics.Classes[0].Types[0].Elements[0])
+	if actual != expected {
+		t.Errorf("Expected value=%s; actual %s", expected, actual)
+	}
+}
+
+func setupTestCase() func() {
+	populateTestMetrics()
+	return func() {
+		cleanTestMetrics()
+	}
+}
+
+func populateTestMetrics() {
+
+	metricClass := new(mqmetric.MonClass)
+	metricType1 := new(mqmetric.MonType)
+	metricType2 := new(mqmetric.MonType)
+	metricElement1 := new(mqmetric.MonElement)
+	metricElement2 := new(mqmetric.MonElement)
+
+	metricClass.Name = "ClassName"
+	metricType1.Name = "Type1Name"
+	metricType2.Name = "Type2Name"
+	metricElement1.MetricName = "Element1Name"
+	metricElement1.Description = "Element1Description"
+	metricElement2.MetricName = "Element2Name"
+	metricElement2.Description = "Element2Description"
+	metricType1.ObjectTopic = "ObjectTopic"
+	metricType2.ObjectTopic = "%s"
+	metricElement1.Parent = metricType1
+	metricElement2.Parent = metricType2
+	metricType1.Parent = metricClass
+	metricType2.Parent = metricClass
+
+	metricType1.Elements = make(map[int]*mqmetric.MonElement)
+	metricType2.Elements = make(map[int]*mqmetric.MonElement)
+	metricType1.Elements[0] = metricElement1
+	metricType2.Elements[0] = metricElement2
+	metricClass.Types = make(map[int]*mqmetric.MonType)
+	metricClass.Types[0] = metricType1
+	metricClass.Types[1] = metricType2
+	mqmetric.Metrics.Classes = make(map[int]*mqmetric.MonClass)
+	mqmetric.Metrics.Classes[0] = metricClass
+}
+
+func cleanTestMetrics() {
+	mqmetric.Metrics.Classes = make(map[int]*mqmetric.MonClass)
+}