我正在尝试编写一个轮询方法,定期轮询服务器以检查是否已创建zip文件。
我想要完成的是以下内容:
这是我的代码段↓
var success: boolean = false;
//1. requests a server to create a zip file
this.apiRequest.downloadRequest(params,ApiUrl.URL_FOR_DOWNLOAD_REQUEST)
.then((resObj) => {
var apiRes: IDownloadService = resObj.data;
if (apiRes.status[0].statusCode == "000") {
success = true;
} else {
//Error
}
}).then(() => {
if (success) {
//2. polls the server to check if the zip file is ready
<- Polling method↓ ->
this.polling(params).then((zipUrl) => {
console.log(zipUrl); //always logs zipUrl
//some subsequent process...
});
}
});
有人可以提供一些在这种情况下可以使用的轮询方法的例子吗?
添加了:
private polling(params: any): ng.IPromise<any> {
var poller = () => this.apiRequest.polling(params, ApiUrl.URL_FOR_POLLING);
var continuation = () => poller().then((resObj) => {
var apiRes: IDownloadService = resObj.data;
if (apiRes.zipFilePath == "") {
return this.$timeout(continuation, 1000);
} else {
return apiRes.zipFilePath;
}
})
var result: ng.IPromise<any> = continuation();
return result;
}
答案 0 :(得分:5)
基本上抽象出如下所示的方法:
let poll = () => this.apiRequest.downloadRequest(params,ApiUrl.URL_FOR_DOWNLOAD_REQUEST)
let continuation = () => poll().then((/*something*/)=> {
/*if still bad*/ return continuation();
/*else */ return good;
})
continuation().then((/*definitely good*/));
根据以下评论的要求:
返回此。$ timeout(继续,1000);
这需要角度来启动摘要周期。