Rename Background to Server

benchmark_test.go

@@ -24,7 +24,7 @@ func BenchmarkEndToEndSimple(b *testing.B) {
 			DB:   redisDB,
 		}
 		client := NewClient(redis)
-		bg := NewBackground(redis, &Config{
+		srv := NewServer(redis, Config{
 			Concurrency: 10,
 			RetryDelayFunc: func(n int, err error, t *Task) time.Duration {
 				return time.Second
@@ -46,11 +46,11 @@ func BenchmarkEndToEndSimple(b *testing.B) {
 		}
 		b.StartTimer() // end setup
 
-		bg.start(HandlerFunc(handler))
+		srv.start(HandlerFunc(handler))
 		wg.Wait()
 
 		b.StopTimer() // begin teardown
-		bg.stop()
+		srv.stop()
 		b.StartTimer() // end teardown
 	}
 }
@@ -67,7 +67,7 @@ func BenchmarkEndToEnd(b *testing.B) {
 			DB:   redisDB,
 		}
 		client := NewClient(redis)
-		bg := NewBackground(redis, &Config{
+		srv := NewServer(redis, Config{
 			Concurrency: 10,
 			RetryDelayFunc: func(n int, err error, t *Task) time.Duration {
 				return time.Second
@@ -99,11 +99,11 @@ func BenchmarkEndToEnd(b *testing.B) {
 		}
 		b.StartTimer() // end setup
 
-		bg.start(HandlerFunc(handler))
+		srv.start(HandlerFunc(handler))
 		wg.Wait()
 
 		b.StopTimer() // begin teardown
-		bg.stop()
+		srv.stop()
 		b.StartTimer() // end teardown
 	}
 }
@@ -124,7 +124,7 @@ func BenchmarkEndToEndMultipleQueues(b *testing.B) {
 			DB:   redisDB,
 		}
 		client := NewClient(redis)
-		bg := NewBackground(redis, &Config{
+		srv := NewServer(redis, Config{
 			Concurrency: 10,
 			Queues: map[string]int{
 				"high":    6,
@@ -160,11 +160,11 @@ func BenchmarkEndToEndMultipleQueues(b *testing.B) {
 		}
 		b.StartTimer() // end setup
 
-		bg.start(HandlerFunc(handler))
+		srv.start(HandlerFunc(handler))
 		wg.Wait()
 
 		b.StopTimer() // begin teardown
-		bg.stop()
+		srv.stop()
 		b.StartTimer() // end teardown
 	}
 }

server.go

@@ -18,10 +18,10 @@ import (
 	"github.com/hibiken/asynq/internal/rdb"
 )
 
-// Background is responsible for managing the background-task processing.
+// Server is responsible for managing the background-task processing.
 //
-// Background manages task queues to process tasks.
-// If the processing of a task is unsuccessful, background will
+// Server pulls tasks off queues and process them.
+// If the processing of a task is unsuccessful, server will
 // schedule it for a retry until either the task gets processed successfully
 // or it exhausts its max retry count.
 //
@@ -29,7 +29,7 @@ import (
 // will be kept in the queue for some time until a certain condition is met
 // (e.g., queue size reaches a certain limit, or the task has been in the
 // queue for a certain amount of time).
-type Background struct {
+type Server struct {
 	mu      sync.Mutex
 	running bool
 
@@ -48,11 +48,11 @@ type Background struct {
 	subscriber  *subscriber
 }
 
-// Config specifies the background-task processing behavior.
+// Config specifies the server's background-task processing behavior.
 type Config struct {
 	// Maximum number of concurrent processing of tasks.
 	//
-	// If set to a zero or negative value, NewBackground will overwrite the value to one.
+	// If set to a zero or negative value, NewServer will overwrite the value to one.
 	Concurrency int
 
 	// Function to calculate retry delay for a failed task.
@@ -67,7 +67,7 @@ type Config struct {
 	// List of queues to process with given priority value. Keys are the names of the
 	// queues and values are associated priority value.
 	//
-	// If set to nil or not specified, the background will process only the "default" queue.
+	// If set to nil or not specified, the server will process only the "default" queue.
 	//
 	// Priority is treated as follows to avoid starving low priority queues.
 	//
@@ -106,7 +106,7 @@ type Config struct {
 	// ErrorHandler: asynq.ErrorHandlerFunc(reportError)
 	ErrorHandler ErrorHandler
 
-	// Logger specifies the logger used by the background instance.
+	// Logger specifies the logger used by the server instance.
 	//
 	// If unset, default logger is used.
 	Logger Logger
@@ -156,9 +156,9 @@ var defaultQueueConfig = map[string]int{
 	base.DefaultQueueName: 1,
 }
 
-// NewBackground returns a new Background given a redis connection option
+// NewServer returns a new Server given a redis connection option
 // and background processing configuration.
-func NewBackground(r RedisConnOpt, cfg *Config) *Background {
+func NewServer(r RedisConnOpt, cfg Config) *Server {
 	n := cfg.Concurrency
 	if n < 1 {
 		n = 1
@@ -196,7 +196,7 @@ func NewBackground(r RedisConnOpt, cfg *Config) *Background {
 	scheduler := newScheduler(logger, rdb, 5*time.Second, queues)
 	processor := newProcessor(logger, rdb, ps, delayFunc, syncCh, cancels, cfg.ErrorHandler)
 	subscriber := newSubscriber(logger, rdb, cancels)
-	return &Background{
+	return &Server{
 		logger:      logger,
 		rdb:         rdb,
 		ps:          ps,
@@ -234,47 +234,47 @@ func (fn HandlerFunc) ProcessTask(ctx context.Context, task *Task) error {
 // an os signal to exit the program is received. Once it receives
 // a signal, it gracefully shuts down all pending workers and other
 // goroutines to process the tasks.
-func (bg *Background) Run(handler Handler) {
+func (srv *Server) Run(handler Handler) {
 	type prefixLogger interface {
 		SetPrefix(prefix string)
 	}
 	// If logger supports setting prefix, then set prefix for log output.
-	if l, ok := bg.logger.(prefixLogger); ok {
+	if l, ok := srv.logger.(prefixLogger); ok {
 		l.SetPrefix(fmt.Sprintf("asynq: pid=%d ", os.Getpid()))
 	}
-	bg.logger.Info("Starting processing")
+	srv.logger.Info("Starting processing")
 
-	bg.start(handler)
-	defer bg.stop()
+	srv.start(handler)
+	defer srv.stop()
 
-	bg.waitForSignals()
+	srv.waitForSignals()
 	fmt.Println()
-	bg.logger.Info("Starting graceful shutdown")
+	srv.logger.Info("Starting graceful shutdown")
 }
 
 // starts the background-task processing.
-func (bg *Background) start(handler Handler) {
-	bg.mu.Lock()
-	defer bg.mu.Unlock()
-	if bg.running {
+func (srv *Server) start(handler Handler) {
+	srv.mu.Lock()
+	defer srv.mu.Unlock()
+	if srv.running {
 		return
 	}
 
-	bg.running = true
-	bg.processor.handler = handler
+	srv.running = true
+	srv.processor.handler = handler
 
-	bg.heartbeater.start(&bg.wg)
-	bg.subscriber.start(&bg.wg)
-	bg.syncer.start(&bg.wg)
-	bg.scheduler.start(&bg.wg)
-	bg.processor.start(&bg.wg)
+	srv.heartbeater.start(&srv.wg)
+	srv.subscriber.start(&srv.wg)
+	srv.syncer.start(&srv.wg)
+	srv.scheduler.start(&srv.wg)
+	srv.processor.start(&srv.wg)
 }
 
 // stops the background-task processing.
-func (bg *Background) stop() {
-	bg.mu.Lock()
-	defer bg.mu.Unlock()
-	if !bg.running {
+func (srv *Server) stop() {
+	srv.mu.Lock()
+	defer srv.mu.Unlock()
+	if !srv.running {
 		return
 	}
 
@@ -282,16 +282,16 @@ func (bg *Background) stop() {
 	// Sender goroutines should be terminated before the receiver goroutines.
 	//
 	// processor -> syncer (via syncCh)
-	bg.scheduler.terminate()
-	bg.processor.terminate()
-	bg.syncer.terminate()
-	bg.subscriber.terminate()
-	bg.heartbeater.terminate()
+	srv.scheduler.terminate()
+	srv.processor.terminate()
+	srv.syncer.terminate()
+	srv.subscriber.terminate()
+	srv.heartbeater.terminate()
 
-	bg.wg.Wait()
+	srv.wg.Wait()
 
-	bg.rdb.Close()
-	bg.running = false
+	srv.rdb.Close()
+	srv.running = false
 
-	bg.logger.Info("Bye!")
+	srv.logger.Info("Bye!")
 }

server_test.go

@@ -13,7 +13,7 @@ import (
 	"go.uber.org/goleak"
 )
 
-func TestBackground(t *testing.T) {
+func TestServer(t *testing.T) {
 	// https://github.com/go-redis/redis/issues/1029
 	ignoreOpt := goleak.IgnoreTopFunction("github.com/go-redis/redis/v7/internal/pool.(*ConnPool).reaper")
 	defer goleak.VerifyNoLeaks(t, ignoreOpt)
@@ -22,8 +22,8 @@ func TestBackground(t *testing.T) {
 		Addr: "localhost:6379",
 		DB:   15,
 	}
-	client := NewClient(r)
-	bg := NewBackground(r, &Config{
+	c := NewClient(r)
+	srv := NewServer(r, Config{
 		Concurrency: 10,
 	})
 
@@ -32,19 +32,19 @@ func TestBackground(t *testing.T) {
 		return nil
 	}
 
-	bg.start(HandlerFunc(h))
+	srv.start(HandlerFunc(h))
 
-	err := client.Enqueue(NewTask("send_email", map[string]interface{}{"recipient_id": 123}))
+	err := c.Enqueue(NewTask("send_email", map[string]interface{}{"recipient_id": 123}))
 	if err != nil {
 		t.Errorf("could not enqueue a task: %v", err)
 	}
 
-	err = client.EnqueueAt(time.Now().Add(time.Hour), NewTask("send_email", map[string]interface{}{"recipient_id": 456}))
+	err = c.EnqueueAt(time.Now().Add(time.Hour), NewTask("send_email", map[string]interface{}{"recipient_id": 456}))
 	if err != nil {
 		t.Errorf("could not enqueue a task: %v", err)
 	}
 
-	bg.stop()
+	srv.stop()
 }
 
 func TestGCD(t *testing.T) {

signals_unix.go

@@ -15,17 +15,17 @@ import (
 // It handles SIGTERM, SIGINT, and SIGTSTP.
 // SIGTERM and SIGINT will signal the process to exit.
 // SIGTSTP will signal the process to stop processing new tasks.
-func (bg *Background) waitForSignals() {
-	bg.logger.Info("Send signal TSTP to stop processing new tasks")
-	bg.logger.Info("Send signal TERM or INT to terminate the process")
+func (srv *Server) waitForSignals() {
+	srv.logger.Info("Send signal TSTP to stop processing new tasks")
+	srv.logger.Info("Send signal TERM or INT to terminate the process")
 
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, unix.SIGTERM, unix.SIGINT, unix.SIGTSTP)
 	for {
 		sig := <-sigs
 		if sig == unix.SIGTSTP {
-			bg.processor.stop()
-			bg.ps.SetStatus(base.StatusStopped)
+			srv.processor.stop()
+			srv.ps.SetStatus(base.StatusStopped)
 			continue
 		}
 		break

signals_windows.go

@@ -14,8 +14,8 @@ import (
 // SIGTERM and SIGINT will signal the process to exit.
 //
 // Note: Currently SIGTSTP is not supported for windows build.
-func (bg *Background) waitForSignals() {
-	bg.logger.Info("Send signal TERM or INT to terminate the process")
+func (srv *Server) waitForSignals() {
+	srv.logger.Info("Send signal TERM or INT to terminate the process")
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, windows.SIGTERM, windows.SIGINT)
 	<-sigs