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joplin/ReactNativeClient/lib/TaskQueue.js

127 lines
2.9 KiB
JavaScript

const { time } = require('lib/time-utils.js');
const Setting = require('lib/models/Setting').default;
const Logger = require('lib/Logger').default;
class TaskQueue {
constructor(name) {
this.waitingTasks_ = [];
this.processingTasks_ = {};
this.processingQueue_ = false;
this.stopping_ = false;
this.results_ = {};
this.name_ = name;
this.logger_ = new Logger();
}
concurrency() {
return Setting.value('sync.maxConcurrentConnections');
}
push(id, callback) {
if (this.stopping_) throw new Error('Cannot push task when queue is stopping');
this.waitingTasks_.push({
id: id,
callback: callback,
});
this.processQueue_();
}
processQueue_() {
if (this.processingQueue_ || this.stopping_) return;
this.processingQueue_ = true;
const completeTask = (task, result, error) => {
delete this.processingTasks_[task.id];
const r = {
id: task.id,
result: result,
};
if (error) r.error = error;
this.results_[task.id] = r;
this.processQueue_();
};
while (this.waitingTasks_.length > 0 && Object.keys(this.processingTasks_).length < this.concurrency()) {
if (this.stopping_) break;
const task = this.waitingTasks_.splice(0, 1)[0];
this.processingTasks_[task.id] = task;
task
.callback()
.then(result => {
completeTask(task, result, null);
})
.catch(error => {
if (!error) error = new Error('Unknown error');
completeTask(task, null, error);
});
}
this.processingQueue_ = false;
}
isWaiting(taskId) {
return this.waitingTasks_.find(task => task.id === taskId);
}
isProcessing(taskId) {
return taskId in this.processingTasks_;
}
isDone(taskId) {
return taskId in this.results_;
}
async waitForResult(taskId) {
if (!this.isWaiting(taskId) && !this.isProcessing(taskId) && !this.isDone(taskId)) throw new Error(`No such task: ${taskId}`);
while (true) {
// if (this.stopping_) {
// return {
// id: taskId,
// error: new JoplinError('Queue has been destroyed', 'destroyedQueue'),
// };
// }
const task = this.results_[taskId];
if (task) return task;
await time.sleep(0.1);
}
}
async stop() {
this.stopping_ = true;
this.logger_.info(`TaskQueue.stop: ${this.name_}: waiting for tasks to complete: ${Object.keys(this.processingTasks_).length}`);
// In general it's not a big issue if some tasks are still running because
// it won't call anything unexpected in caller code, since the caller has
// to explicitely retrieve the results
const startTime = Date.now();
while (Object.keys(this.processingTasks_).length) {
await time.sleep(0.1);
if (Date.now() - startTime >= 30000) {
this.logger_.warn(`TaskQueue.stop: ${this.name_}: timed out waiting for task to complete`);
break;
}
}
this.logger_.info(`TaskQueue.stop: ${this.name_}: Done, waited for ${Date.now() - startTime}`);
}
isStopping() {
return this.stopping_;
}
}
TaskQueue.CONCURRENCY = 5;
module.exports = TaskQueue;