August 2017 - Cobub
Activiti analyses

Activiti analyses

5 months ago 2 1046

The Activiti framework is one of the workflow frameworks that have developed rapidly in recent years with its open source features.Another workflow framework, JBPM5, is currently a very popular workflow framework.While these two frameworks are two different companies, the two frameworks have a lot to do with it.Tom Baeyens, the director of the Activiti workflow framework, has previously worked for jBoss, currently the publisher of JBPM5, as the chief architect of the previous JBPM4 workflow engine.But it was speculated that Tom Baeyens left jBoss to work for Alfresco because of internal contradictions within jBoss and a serious disagreement over the future version of the workflow engine.However, for months, Tom Baeyens has launched Activiti, an open-source workflow system based on the JBPM4 workflow engine.

(中文) RPC框架技术初窥

5 months ago 1 882

(中文)

RPC是什么

RPC(Remote Procedure Call Protocol)——远程过程调用协议,它是一种通过网络从远程计算机程序上请求服务,而不需要了解底层网络技术的协议。
RPC采用客户机/服务器模式。请求程序就是一个客户机,而服务提供程序就是一个服务器。首先,客户机调用进程发送一个有进程参数的调用信息到服务进程,然后等待应答信息。在服务器端,进程保持睡眠状态直到调用信息到达为止。当一个调用信息到达,服务器获得进程参数,计算结果,发送答复信息,然后等待下一个调用信息,最后,客户端调用进程接收答复信息,获得进程结果,然后调用执行继续进行。
以上是百度百科对RPC的解释。
一个通俗的描述是:客户端在不知道调用细节的情况下,调用存在于远程计算机上的某个对象,就像调用本地应用程序中的对象一样。

(中文) 深入解析jquery实现原理第一章

5 months ago 1 562

JQuery is a very good JavaScript library, which greatly enhances the development experience of the front end js, so I recently looked at the source code of JQuery and wanted to share some of my understanding with you.

How to Improve APP Retention Rate?

5 months ago 1 805

The sole purpose of business is to create and retain customers

Our APP marketers are always better at getting more and more people to use our products and become our users. But how do you keep them when you have them? It may not be hard for a new app to attract hundreds of millions of users. But it’s never easy to keep these users and increase the number of users to 100 million.
Although users retention needs us to spend a long time to complete the work, we can still take some measures to improve it in the short term and can improve user activity, such as some marketing activities or according to the user’s usage of history to their push precise related news. This is a good way to interact with the users to let them participate, users can be obtained from these activities and news to get more valuable things. Therefore, the app retention rate will be increased.

ORA 4031 error depth parsing

5 months ago 1 734

To fully understand the cause of the 4301 error is to understand the execution of the SQL statement and the structure of the Oracle Shared memory.


The communication process diagram between the client and Oracle