1 files changed, 113 insertions, 0 deletions
diff --git a/modules/queue/manager.go b/modules/queue/manager.go
new file mode 100644
index 0000000..8b964c0
--- /dev/null
+++ b/modules/queue/manager.go
@@ -0,0 +1,113 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package queue
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// Manager is a manager for the queues created by "CreateXxxQueue" functions, these queues are called "managed queues".
+type Manager struct {
+	mu sync.Mutex
+
+	qidCounter int64
+	Queues     map[int64]ManagedWorkerPoolQueue
+}
+
+type ManagedWorkerPoolQueue interface {
+	GetName() string
+	GetType() string
+	GetItemTypeName() string
+	GetWorkerNumber() int
+	GetWorkerActiveNumber() int
+	GetWorkerMaxNumber() int
+	SetWorkerMaxNumber(num int)
+	GetQueueItemNumber() int
+
+	// FlushWithContext tries to make the handler process all items in the queue synchronously.
+	// It is for testing purpose only. It's not designed to be used in a cluster.
+	FlushWithContext(ctx context.Context, timeout time.Duration) error
+
+	// RemoveAllItems removes all items in the base queue (on-the-fly items are not affected)
+	RemoveAllItems(ctx context.Context) error
+}
+
+var manager *Manager
+
+func init() {
+	manager = &Manager{
+		Queues: make(map[int64]ManagedWorkerPoolQueue),
+	}
+}
+
+func GetManager() *Manager {
+	return manager
+}
+
+func (m *Manager) AddManagedQueue(managed ManagedWorkerPoolQueue) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.qidCounter++
+	m.Queues[m.qidCounter] = managed
+}
+
+func (m *Manager) GetManagedQueue(qid int64) ManagedWorkerPoolQueue {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.Queues[qid]
+}
+
+func (m *Manager) ManagedQueues() map[int64]ManagedWorkerPoolQueue {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	queues := make(map[int64]ManagedWorkerPoolQueue, len(m.Queues))
+	for k, v := range m.Queues {
+		queues[k] = v
+	}
+	return queues
+}
+
+// FlushAll tries to make all managed queues process all items synchronously, until timeout or the queue is empty.
+// It is for testing purpose only. It's not designed to be used in a cluster.
+func (m *Manager) FlushAll(ctx context.Context, timeout time.Duration) error {
+	var finalErr error
+	qs := m.ManagedQueues()
+	for _, q := range qs {
+		if err := q.FlushWithContext(ctx, timeout); err != nil {
+			finalErr = err // TODO: in Go 1.20: errors.Join
+		}
+	}
+	return finalErr
+}
+
+// CreateSimpleQueue creates a simple queue from global setting config provider by name
+func CreateSimpleQueue[T any](ctx context.Context, name string, handler HandlerFuncT[T]) *WorkerPoolQueue[T] {
+	return createWorkerPoolQueue(ctx, name, setting.CfgProvider, handler, false)
+}
+
+// CreateUniqueQueue creates a unique queue from global setting config provider by name
+func CreateUniqueQueue[T any](ctx context.Context, name string, handler HandlerFuncT[T]) *WorkerPoolQueue[T] {
+	return createWorkerPoolQueue(ctx, name, setting.CfgProvider, handler, true)
+}
+
+func createWorkerPoolQueue[T any](ctx context.Context, name string, cfgProvider setting.ConfigProvider, handler HandlerFuncT[T], unique bool) *WorkerPoolQueue[T] {
+	queueSetting, err := setting.GetQueueSettings(cfgProvider, name)
+	if err != nil {
+		log.Error("Failed to get queue settings for %q: %v", name, err)
+		return nil
+	}
+	w, err := NewWorkerPoolQueueWithContext(ctx, name, queueSetting, handler, unique)
+	if err != nil {
+		log.Error("Failed to create queue %q: %v", name, err)
+		return nil
+	}
+	GetManager().AddManagedQueue(w)
+	return w
+}