confirm

[Java复习] 分布式事务 Part 2

由 痞子三分冷 提交于 2019-12-15 12:37:12
分布式事务了解吗？如果解决分布式事务问题的？ 面试官心里： 只要聊到你做了分布式系统，必问分布式事务，起码得知道有哪些方案，一般怎么来做，每个方案的优缺点是什么。 为什么要有分布式事务？ 分布式事务实现的几种方案： 1. 两阶段提交方案/XA 方案 这种分布式事务方案，比较适合单块应用里。 跨多个库的分布式事务 ，由于因为严重依赖于数据库层面来搞定复杂的事务，效率很低，绝对不适合高并发的场景。 如果要玩儿，那么基于 Spring + JTA 就可以搞定。 这个方案，很少用，一般来说某个系统内部如果出现跨多个库的这么一个操作，是不合规的。 如果你要操作别人的服务的库，你必须是通过调用别的服务的接口来实现，绝对不允许交叉访问别人的数据库。 2. TCC(Try, Confirm, Cancel) 方案 使用补偿机制。分三个阶段： Try 阶段：这个阶段说的是对各个服务的资源做检测以及对资源进行锁定或者预留。 Confirm 阶段：这个阶段说的是在各个服务中执行实际的操作。 Cancel 阶段：如果任何一个服务的业务方法执行出错，那么这里就需要进行补偿，就是执行已经执行成功的业务逻辑的回滚操作。（把那些执行成功的回滚） 缺点：与业务耦合太紧，事务回滚严重依赖自己的写的代码来回滚和补偿。 适用场景： 与钱打交道的场景，支付，交易 。需要TCC，严格保证分布式事务要么全部成功

高并发分布式事务的实现方法及替代方案

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-15 05:32:59
这两天正在研究微服务架构中分布式事务的处理方案, 做一个小小的总结, 作为备忘. 如有错误, 欢迎指正! 概念澄清 事务补偿机制: 在事务链中的任何一个正向操作, 都必须存在一个完全符合回滚规则的可逆操作, 这个操作通常叫做rollback或者cancel. CAP理论: CAP(Consistency, Availability, Partition Tolerance), 阐述了一个分布式系统的三个主要方面, 只能同时择其二进行实现. 常见的有CP系统, AP系统. 为什么CA不行呢? 因为没有P的话, 数据一致性会出现问题, 这是任何一个一致性系统不允许出现的情况. 幂等性: 简单的说, 业务操作支持重试, 不会产生不利影响. 常见的实现方式: 为消息额外增加唯一ID. BASE(Basically avaliable, soft state, eventually consistent): 是分布式事务实现的一种理论标准. 柔性事务 vs. 刚性事务 刚性事务是指强一致性事务, 例如单机环境下遵循ACID的数据库事务, 或者分布式环境中的2PC等. 柔性事务是指遵循BASE理论的事务, 通常用在分布式环境中, 常见的实现方式有: 异步确保型, 最大努力通知型. 最佳实践 先上结论, 再分别介绍分布式事务的各种实现方式. 如果业务场景需要强一致性,

call js confirm from code behind

由 落爺英雄遲暮 提交于 2019-12-14 02:36:14
问题 codebehind Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click Dim ResourceObject As Object Dim js As [String] = (vbCr & vbLf & " if(confirm('Esta Seguro de eliminar de la lista')==true)" & vbCr & vbLf & " document.getElementById('" & txtRespuesta.ClientID & "').value='true';" & vbCr & vbLf & " else" & vbCr & vbLf & " document.getElementById('") + txtRespuesta.ClientID & "').value='false';" & vbCr & vbLf & " " ScriptManager

MSHTML - Auto Click for JavaScript confirm dialog

由 ∥☆過路亽．° 提交于 2019-12-14 02:29:07
问题 I am trying to automatically parse/submit a web page using MSHTML (in C#.Net 3.1 WPF WebBrowser control). I can fill the forms, click buttons, and navigate pages without problems. But I do not know how to automatically click the "OK" button on the JavaScript confirmation dialog which appears when I click the "Submit" button. C# code: mshtml.IHTMLDocument2 doc = (mshtml.IHTMLDocument2)webBrowser.Document; mshtml.IHTMLFormElement form = doc.forms.item("inputForm", 0) as mshtml.IHTMLFormElement;

using the confirm method when leaving site

由 五迷三道 提交于 2019-12-13 20:36:35
问题 I want a confirm message to popup when clicking on an external link. Though it doesnt want to work out. I dont get the confirm popup when i click on an external link. Any solutions ? Javascript code function warning(){ var warning = confirm('Do you want to leave'); if(!warning){ alert("Staying on site"); return false; } else { alert("Leaving site"); return true; } } function init() { var warn = document.getElementsByTagName("ul"); for(i=0; i<warn.length; i++) if(warn[i].className == "meny"){

jQuery - Form submits before alertify receives confirm box value (with HTML5)

由 ぐ巨炮叔叔 提交于 2019-12-13 08:48:05
问题 I have a form with 2 fields, one of which is required. I used HTML5 required attribute to check if the field is filled up during submission. <form id ='reg' name='reg' action='here.php' method='post'> <input type='text' id='name' name='name' placeholder='Name' value='' required="true" /> <input type='text' id='contactno' name='contactno' placeholder='Contact No' value='' /> <input type='submit' value='Register' name='register' id='register' /> </form> Before the form actually submits, I want

Return confirm in JavaScript

由 蓝咒 提交于 2019-12-13 07:37:22
问题 I have problem with return confirm in Chrome. In Firefox it is ok. window.onbeforeunload = function() { var result = confirm('Really?'); if(result) { console.log('Do something'); } } Any ideas? Thanks! 回答1: You should return something from beforeunload . The confirm will be ignored Since 25 May 2011, the HTML5 specification states that calls to window.showModalDialog(), window.alert(), window.confirm() and window.prompt() methods may be ignored during this event. see MDN window.onbeforeunload

Deleting row from table with modal form confirmation (jQuery UI)?

由 本小妞迷上赌 提交于 2019-12-13 06:51:11
问题 I have just started to study jQuery and it seems to be full of opportunities, if I can just learn it. I have created a table with the last cell containing delete-button. By clicking the button I'll like to have an confirmation dialog to appear and if the user accepts the row will be deleted. Cancel just closes the confirm dialog. But I have no idea how to do that, even after reading many examples posted here in stackoverflow or in other sites as well. I just couldn't adapt those to my project

execute different codes in code behind on confirm ok and cancel

由 亡梦爱人 提交于 2019-12-13 04:53:03
问题 I want to have a confirm message on text_changed event and execute different set of codes on ok and cancel. Help me with these codes <script type = "text/javascript"> function Confirm() { var confirm_value = document.createElement("INPUT"); confirm_value.type = "hidden"; confirm_value.name = "confirm_value"; if (confirm("Do you want to save data?")) { confirm_value.value = "Yes"; } else { confirm_value.value = "No"; } document.forms[0].appendChild(confirm_value); } </script> <asp:TextBox ID=

Execute different codes on ok and cancel of confirm message

由 て烟熏妆下的殇ゞ 提交于 2019-12-13 04:41:59
问题 I have a textBox and I want to create a confirm message on text_changed event and execute different codes on ok and cancel in code behind under text_changed event <asp:TextBox ID="TextBox1" runat="server" ontextchanged="TextBox1_TextChanged"></asp:TextBox> 回答1: window.confirm returns a boolean, in your button you could add onclick="trigger_confirmation" var trigger_confirmation = function(){ if(window.confirm("Are you sure blah blah blah?")){ // user confirmed } else { // user declined } }
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