Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/queue/options.go

@@ -0,0 +1,109 @@
+package queue
+
+import (
+	"runtime"
+	"time"
+)
+
+// An Option configures a mutex.
+type Option interface {
+	apply(*options)
+}
+
+// OptionFunc is a function that configures a queue.
+type OptionFunc func(*options)
+
+// Apply calls f(option)
+func (f OptionFunc) apply(option *options) {
+	f(option)
+}
+
+type options struct {
+	maxTaskExecution   time.Duration // Maximum execution time for a Task.
+	retryDelay         time.Duration
+	taskPullInterval   time.Duration
+	backoffFactor      float64
+	backoffMaxDuration time.Duration
+	maxRetry           int
+	resumeTaskType     []string
+	workerCount        int
+	name               string
+}
+
+func newDefaultOptions() *options {
+	return &options{
+		workerCount:        runtime.NumCPU(),
+		maxTaskExecution:   60 * time.Hour,
+		backoffFactor:      2,
+		backoffMaxDuration: 60 * time.Second,
+		resumeTaskType:     []string{},
+		taskPullInterval:   1 * time.Second,
+		name:               "default",
+	}
+}
+
+// WithMaxTaskExecution set maximum execution time for a Task.
+func WithMaxTaskExecution(d time.Duration) Option {
+	return OptionFunc(func(q *options) {
+		q.maxTaskExecution = d
+	})
+}
+
+// WithRetryDelay set retry delay
+func WithRetryDelay(d time.Duration) Option {
+	return OptionFunc(func(q *options) {
+		q.retryDelay = d
+	})
+}
+
+// WithBackoffFactor set backoff factor
+func WithBackoffFactor(f float64) Option {
+	return OptionFunc(func(q *options) {
+		q.backoffFactor = f
+	})
+}
+
+// WithBackoffMaxDuration set backoff max duration
+func WithBackoffMaxDuration(d time.Duration) Option {
+	return OptionFunc(func(q *options) {
+		q.backoffMaxDuration = d
+	})
+}
+
+// WithMaxRetry set max retry
+func WithMaxRetry(n int) Option {
+	return OptionFunc(func(q *options) {
+		q.maxRetry = n
+	})
+}
+
+// WithResumeTaskType set resume Task type
+func WithResumeTaskType(types ...string) Option {
+	return OptionFunc(func(q *options) {
+		q.resumeTaskType = types
+	})
+}
+
+// WithWorkerCount set worker count
+func WithWorkerCount(num int) Option {
+	return OptionFunc(func(q *options) {
+		if num <= 0 {
+			num = runtime.NumCPU()
+		}
+		q.workerCount = num
+	})
+}
+
+// WithName set queue name
+func WithName(name string) Option {
+	return OptionFunc(func(q *options) {
+		q.name = name
+	})
+}
+
+// WithTaskPullInterval set task pull interval
+func WithTaskPullInterval(d time.Duration) Option {
+	return OptionFunc(func(q *options) {
+		q.taskPullInterval = d
+	})
+}