Add task api and resource locking ability

task/task.go

@@ -0,0 +1,50 @@
+package task
+
+import (
+	"sync/atomic"
+)
+
+// State task is in
+type State int
+
+// Detail represents custom task details
+type Detail struct {
+	atomic.Value
+}
+
+// Process is a function implementing the actual task logic
+type Process func(out *Output, detail *Detail) error
+
+const (
+	// IDLE when task is waiting
+	IDLE State = iota
+	// RUNNING when task is running
+	RUNNING
+	// SUCCEEDED when task is successfully finished
+	SUCCEEDED
+	// FAILED when task failed
+	FAILED
+)
+
+// Task represents as task in a queue encapsulates process code
+type Task struct {
+	output  *Output
+	detail  *Detail
+	process Process
+	Name    string
+	ID      int
+	State   State
+}
+
+// NewTask creates new task
+func NewTask(process Process, name string, ID int) *Task {
+	task := &Task{
+		output:  NewOutput(),
+		detail:  &Detail{},
+		process: process,
+		Name:    name,
+		ID:      ID,
+		State:   IDLE,
+	}
+	return task
+}