Initial cloud-services repo - gateway service + pkg modules

pkg/utils/threadpool/callable.go

@@ -0,0 +1,35 @@
+package threadpool
+
+// Callable the tasks which returns the output after exit should implement this interface
+type Callable interface {
+	Call() interface{}
+}
+
+// Future is the handle returned after submitting a callable task to the thread threadpool
+type Future struct {
+	response chan interface{}
+	done     bool
+}
+
+// callableTask is internally used to wrap the callable and future together
+// So that the worker can send the response back through channel provided in Future object
+type callableTask struct {
+	Task   Callable
+	Handle *Future
+}
+
+// Get returns the response of the Callable task when done
+// Is is the blocking call it waits for the execution to complete
+func (f *Future) Get() interface{} {
+	return <-f.response
+}
+
+// IsDone returns true if the execution is already done
+func (f *Future) IsDone() bool {
+	return f.done
+}
+
+// Runnable is interface for the jobs that will be executed by the threadpool
+type Runnable interface {
+	Run()
+}