Metadata implementation

Author: cschleiden

internal/core/metadata.go

@@ -0,0 +1,21 @@
+package core
+
+type WorkflowInstanceMetadata map[string]string
+
+func (wim WorkflowInstanceMetadata) Get(key string) string {
+	return wim[key]
+}
+
+func (wim WorkflowInstanceMetadata) Set(key string, value string) {
+	wim[key] = value
+}
+
+func (wim WorkflowInstanceMetadata) Keys() []string {
+	r := make([]string, 0, len(wim))
+
+	for k := range wim {
+		r = append(r, k)
+	}
+
+	return r
+}