feat: add configurable retry interval for queue retries (#144)

- Import `time` package
- Add `WithRetryInterval` function to set retry intervals
- Add `retryInterval` field to `Options` struct with default value of 1 second
- New file `options_test.go` for testing `WithRetryInterval` functionality with various durations
- Add `retryInterval` field to `Queue` struct
- Initialize ticker with `retryInterval` in `Queue` and update its usage in `start` method

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

options.go

@@ -3,6 +3,7 @@ package queue
 import (
 	"context"
 	"runtime"
+	"time"
 
 	"github.com/golang-queue/queue/core"
 )
@@ -80,26 +81,35 @@ func WithAfterFn(afterFn func()) Option {
 	})
 }
 
+// WithRetryInterval sets the retry interval
+func WithRetryInterval(d time.Duration) Option {
+	return OptionFunc(func(q *Options) {
+		q.retryInterval = d
+	})
+}
+
 // Options for custom args in Queue
 type Options struct {
-	workerCount int64
-	logger      Logger
-	queueSize   int
-	worker      core.Worker
-	fn          func(context.Context, core.TaskMessage) error
-	afterFn     func()
-	metric      Metric
+	workerCount   int64
+	logger        Logger
+	queueSize     int
+	worker        core.Worker
+	fn            func(context.Context, core.TaskMessage) error
+	afterFn       func()
+	metric        Metric
+	retryInterval time.Duration
 }
 
 // NewOptions initialize the default value for the options
 func NewOptions(opts ...Option) *Options {
 	o := &Options{
-		workerCount: defaultWorkerCount,
-		queueSize:   defaultCapacity,
-		logger:      defaultNewLogger,
-		worker:      nil,
-		fn:          defaultFn,
-		metric:      defaultMetric,
+		workerCount:   defaultWorkerCount,
+		queueSize:     defaultCapacity,
+		logger:        defaultNewLogger,
+		worker:        nil,
+		fn:            defaultFn,
+		metric:        defaultMetric,
+		retryInterval: time.Second,
 	}
 
 	// Loop through each option

options_test.go

@@ -0,0 +1,44 @@
+package queue
+
+import (
+	"testing"
+	"time"
+)
+
+func TestWithRetryInterval(t *testing.T) {
+	tests := []struct {
+		name     string
+		duration time.Duration
+		want     time.Duration
+	}{
+		{
+			name:     "Set 2 seconds retry interval",
+			duration: 2 * time.Second,
+			want:     2 * time.Second,
+		},
+		{
+			name:     "Set 500ms retry interval",
+			duration: 500 * time.Millisecond,
+			want:     500 * time.Millisecond,
+		},
+		{
+			name:     "Set zero retry interval",
+			duration: 0,
+			want:     0,
+		},
+		{
+			name:     "Set negative retry interval",
+			duration: -1 * time.Second,
+			want:     -1 * time.Second,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			opts := NewOptions(WithRetryInterval(tt.duration))
+			if opts.retryInterval != tt.want {
+				t.Errorf("WithRetryInterval() = %v, want %v", opts.retryInterval, tt.want)
+			}
+		})
+	}
+}

queue.go

@@ -20,16 +20,17 @@ type (
 	// A Queue is a message queue.
 	Queue struct {
 		sync.Mutex
-		metric       *metric
-		logger       Logger
-		workerCount  int64
-		routineGroup *routineGroup
-		quit         chan struct{}
-		ready        chan struct{}
-		worker       core.Worker
-		stopOnce     sync.Once
-		stopFlag     int32
-		afterFn      func()
+		metric        *metric
+		logger        Logger
+		workerCount   int64
+		routineGroup  *routineGroup
+		quit          chan struct{}
+		ready         chan struct{}
+		worker        core.Worker
+		stopOnce      sync.Once
+		stopFlag      int32
+		afterFn       func()
+		retryInterval time.Duration
 	}
 )
 
@@ -40,14 +41,15 @@ var ErrMissingWorker = errors.New("missing worker module")
 func NewQueue(opts ...Option) (*Queue, error) {
 	o := NewOptions(opts...)
 	q := &Queue{
-		routineGroup: newRoutineGroup(),
-		quit:         make(chan struct{}),
-		ready:        make(chan struct{}, 1),
-		workerCount:  o.workerCount,
-		logger:       o.logger,
-		worker:       o.worker,
-		metric:       &metric{},
-		afterFn:      o.afterFn,
+		routineGroup:  newRoutineGroup(),
+		quit:          make(chan struct{}),
+		ready:         make(chan struct{}, 1),
+		workerCount:   o.workerCount,
+		logger:        o.logger,
+		worker:        o.worker,
+		metric:        &metric{},
+		afterFn:       o.afterFn,
+		retryInterval: o.retryInterval,
 	}
 
 	if q.worker == nil {
@@ -296,6 +298,8 @@ func (q *Queue) schedule() {
 // start to start all worker
 func (q *Queue) start() {
 	tasks := make(chan core.TaskMessage, 1)
+	ticker := time.NewTicker(q.retryInterval)
+	defer ticker.Stop()
 
 	for {
 		// check worker number
@@ -320,8 +324,7 @@ func (q *Queue) start() {
 								close(tasks)
 								return
 							}
-						case <-time.After(time.Second):
-							// sleep 1 second to fetch new task
+						case <-ticker.C:
 						}
 					}
 				}