🎨 改进内核任务调度机制提升稳定性 https://github.com/siyuan-note/siyuan/issues/7113

kernel/task/queue.go

@@ -0,0 +1,162 @@
+// SiYuan - Build Your Eternal Digital Garden
+// Copyright (c) 2020-present, b3log.org
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package task
+
+import (
+	"reflect"
+	"sync"
+	"time"
+
+	"github.com/siyuan-note/logging"
+)
+
+var (
+	taskQueue       []*Task
+	taskQueueStatus int
+	queueLock       = sync.Mutex{}
+	taskLock        = sync.Mutex{}
+)
+
+const (
+	QueueStatusRunning = iota
+	QueueStatusClosing
+)
+
+type Task struct {
+	Action  string
+	Handler reflect.Value
+	Args    []interface{}
+	Created time.Time
+}
+
+func PrependTask(action string, handler interface{}, args ...interface{}) {
+	queueLock.Lock()
+	defer queueLock.Unlock()
+
+	if QueueStatusRunning != taskQueueStatus {
+		logging.LogWarnf("task queue is paused, action [%s] will be ignored", action)
+		return
+	}
+
+	cancelTask(action)
+	taskQueue = append([]*Task{newTask(action, handler, args...)}, taskQueue...)
+}
+
+func AppendTask(action string, handler interface{}, args ...interface{}) {
+	queueLock.Lock()
+	defer queueLock.Unlock()
+
+	if QueueStatusRunning != taskQueueStatus {
+		logging.LogWarnf("task queue is paused, action [%s] will be ignored", action)
+		return
+	}
+
+	cancelTask(action)
+	taskQueue = append(taskQueue, newTask(action, handler, args...))
+}
+
+func CancelTask(actions ...string) {
+	queueLock.Lock()
+	defer queueLock.Unlock()
+
+	cancelTask(actions...)
+}
+
+func cancelTask(actions ...string) {
+	for i := len(taskQueue) - 1; i >= 0; i-- {
+		task := taskQueue[i]
+		for _, action := range actions {
+			if action == task.Action {
+				taskQueue = append(taskQueue[:i], taskQueue[i+1:]...)
+				break
+			}
+		}
+	}
+}
+
+func newTask(action string, handler interface{}, args ...interface{}) *Task {
+	return &Task{
+		Action:  action,
+		Handler: reflect.ValueOf(handler),
+		Args:    args,
+		Created: time.Now(),
+	}
+}
+
+const (
+	CloudSync               = "task.cloud.sync"                // 数据同步
+	RepoCheckout            = "task.repo.checkout"             // 从快照中检出
+	DatabaseIndexFull       = "task.database.index.full"       // 重建索引
+	DatabaseIndex           = "task.database.index"            // 数据库所以队列
+	DatabaseIndexFix        = "task.database.index.fix"        // 数据库索引订正
+	OCRImage                = "task.ocr.image"                 // 图片 OCR 提取文本
+	DatabaseIndexEmbedBlock = "task.database.index.embedblock" // 数据库索引嵌入块
+)
+
+func Loop() {
+	for {
+		time.Sleep(10 * time.Millisecond)
+		task := popTask()
+		if nil == task {
+			continue
+		}
+
+		execTask(task)
+	}
+}
+
+func CloseWait() {
+	queueLock.Lock()
+	defer queueLock.Unlock()
+
+	taskQueueStatus = QueueStatusClosing
+	for {
+		time.Sleep(10 * time.Millisecond)
+		if 1 > len(taskQueue) {
+			break
+		}
+	}
+}
+
+func popTask() (ret *Task) {
+	queueLock.Lock()
+	defer queueLock.Unlock()
+
+	if 0 == len(taskQueue) {
+		return
+	}
+
+	ret = taskQueue[0]
+	taskQueue = taskQueue[1:]
+	return
+}
+
+func execTask(task *Task) {
+	taskLock.Lock()
+	defer taskLock.Unlock()
+	defer logging.Recover()
+
+	args := make([]reflect.Value, len(task.Args))
+	for i, v := range task.Args {
+		if nil == v {
+			args[i] = reflect.New(task.Handler.Type().In(i)).Elem()
+		} else {
+			args[i] = reflect.ValueOf(v)
+		}
+	}
+	task.Handler.Call(args)
+}