confirm

简述 分布式事务指事务的操作位于不同的节点上，需要保证事务的 AICD 特性。 例如在下单场景下，库存和订单如果不在同一个节点上，就涉及分布式事务。 解决方案 在分布式系统中，要实现分布式事务，无外乎那几种解决方案。 一、两阶段提交（2PC） 两阶段提交（Two-phase Commit，2PC），通过引入协调者（Coordinator）来协调参与者的行为，并最终决定这些参与者是否要真正执行事务。 1. 运行过程 1.1 准备阶段 协调者询问参与者事务是否执行成功，参与者发回事务执行结果。 1.2 提交阶段 如果事务在每个参与者上都执行成功，事务协调者发送通知让参与者提交事务；否则，协调者发送通知让参与者回滚事务。 需要注意的是，在准备阶段，参与者执行了事务，但是还未提交。只有在提交阶段接收到协调者发来的通知后，才进行提交或者回滚。 2. 存在的问题 2.1 同步阻塞 所有事务参与者在等待其它参与者响应的时候都处于同步阻塞状态，无法进行其它操作。 2.2 单点问题 协调者在 2PC 中起到非常大的作用，发生故障将会造成很大影响。特别是在阶段二发生故障，所有参与者会一直等待状态，无法完成其它操作。 2.3 数据不一致 在阶段二，如果协调者只发送了部分 Commit 消息，此时网络发生异常，那么只有部分参与者接收到 Commit 消息，也就是说只有部分参与者提交了事务

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The goal is to have a shiny module ui1.R that loads a second module ui2.R when the button confirm is clicked. I think the issue is that is.null(input$confirm) is always invalidated. What I need instead, is to invalidate the expression only once confirm is clicked. The question is very close to Starting Shiny app after password input , but I am trying to modularize the solution. ui.R library(shiny) library(shinyjs) htmlOutput("page") server.R rm(list = ls()) library(shiny) library(dplyr) library(shinyjs) Logged <- FALSE shinyServer(function

1、2PC协议 　　2PC 是二阶段提交（Two-phase Commit）的缩写，顾名思义，这个协议分两阶段完成。第一个阶段是准备阶段，第二个阶段是提交阶段，准备阶段和提交阶段都是由事务管理器（协调者）发起的，协调的对象是资源管理器（参与者）。二阶段提交协议的概念来自 X/Open 组织提出的分布式事务的规范 XA 协议，协议主要定义了（全局）事务管理器和（局部）资源管理器之间的接口。XA 接口是双向的系统接口，在事务管理器以及一个或多个资源管理器之间形成通信桥梁。Java 平台上的事务规范 JTA（Java Transaction API）提供了对 XA 事务的支持，它要求所有需要被分布式事务管理的资源（由不同厂商实现）都必须实现规定接口（XAResource 中的 prepare、commit 和 rollback 等）。 　　①准备阶段：协调者向参与者发起指令，参与者评估自己的状态，如果参与者评估指令可以完成，参与者会写 redo 和 undo 日志，然后锁定资源，执行操作，但是并不提交。 　　②提交阶段：如果每个参与者明确返回准备成功，也就是预留资源和执行操作成功，协调者向参与者发起提交指令，参与者提交资源变更的事务，释放锁定的资源；如果任何一个参与者明确返回准备失败，也就是预留资源或者执行操作失败，协调者向参与者发起中止指令，参与者取消已经变更的事务，执行 undo

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Given the following route: router.get('/api/members/confirm/:id, function (req, res, next) how do I specify the route to be excluded? I have tried: app.use('/api', expressJwt({ secret: config.secret}).unless({path: ['/api/members/confirm']})); and app.use('/api', expressJwt({ secret: config.secret}).unless({path: ['/api/members/confirm/:id']})); but neither path in the unless array seem to work? 回答1: The express-jwt module is using express-unless to give you this unless method, which doesn't accept express' :param path arguments syntax. But

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am, trying to replicate the 'confirm' box of javascript using jquery dialog. This is my code, function customConfirm(customMessage) { $("#popUp").html(customMessage); $("#popUp").dialog({ resizable: false, height: 240, modal: true, buttons: { "OK": function () { $(this).dialog("close"); alert(true); return true; }, Cancel: function () { $(this).dialog("close"); alert(false); return false; } } }); } But when I tried to alert this method, it shows 'undefined'. It is not waiting for the popup to display. How can i make this customConfirm

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I took the following BalusC kickoff example and modified it a bit by adding a submit button and additional h:messages and removing the f:ajax from the h:inputSecret's (removed the f:ajax cause for some reason when I leave the first h:inputSecret it immediately displays "value is required" error for the second h:inputSecret - but the user haven't got the chance to type it in... ??? <- another future question ?:) ) OK, to make long story short: I'm trying to figure out how can display the validation errors regarding the both password fields

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to implement a simple 2 part FormWizard. Form 1 will by dynamically generated something like this: class BuyAppleForm(forms.Form): creditcard = forms.ChoiceField(widget = forms.RadioSelect) type = forms.ChoiceField(widget = forms.RadioSelect) def __init__(self,*args, **kwargs): user = kwargs['user'] del kwargs['user'] super(BuyAppleForm, self).__init__(*args, **kwargs) credit_cards = get_credit_cards(user) self.fields['creditcard'].choices = [(card.id,str(card)) for card in credit_cards] apple_types= get_types_packages() self.fields[

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have multiple forms on a page, for each of them I want the user to confirm before form submission. but when the user confirms to submit, how do I let this dialog know which form the user is sumbitting? Does it take custom parameters? Thanks. $("#dialog-confirm").dialog({ resizable: false, height:140, modal: true, buttons: { 'Confirm submit': function() { document.______???????_____.submit(); }, Cancel: function() { $(this).dialog('close'); } } }); $('.allForms').submit(function(){ $('#dialog-confirm').dialog('open'); }); 回答1: You can store

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: i need to confirm delete using bootstrap 3 modal box(YES/NO). how do can create this? HTML Code: <form action ="<?php echo $URL .'/admin/privileges.php?action=editable' ?>" method="POST"> <button class='btn btn-danger btn-xs' type="submit" name="remove_levels" value="delete"><span class="fa fa-times"></span> delete</button></td> </form> 回答1: You need the modal in your HTML. When the delete button is clicked it pops the modal. It's also important to prevent the click of that button from submitting the form. When the confirmation is clicked,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am upgrading from rails 3.2.19 to rails 4.1.5, using rspec-rails 2.14.0.rc1 and capybara 2.4.1. All tests pass, and I only have one deprecation warning left: [ DEPRECATION ] Capybara :: Webkit :: Driver #accept_js_confirms! is deprecated. Please use Capybara::Session#accept_confirm instead. The line of code that is causing this is page . driver . accept_js_confirms ! How do I change this line in order to eliminate the deprecation warning? 回答1: Given that the exception says: Please use Capybara::Session#accept_confirm instead. You