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RHTE - Improve business process with microservice integration

The Red Hat Tech Exchange take place every year in Asia Pacific, this year is in Vietnam, Ho Chi Minh city. This year's theme is Train (gain and apply knowledge and skills), Share (best practices and experiences) and Enable (your personal and customer success).  I sure had a great time there.

In the event I have share 2 sessions, the first one I did with Thomas Qvarnström, it about handling large data and how JBoss Data Grid can help. You can find the slides in my previous post.  

My second session talks about the difference between BPM process and Camel route, when to use what and share my thoughts on the best practices of when to use it. The agenda of my talk :

Sometimes, building enterprise class business processes is difficult, it involves  complex application integration, many requires co-work between cross functions. See how JBoss BPM suite and JBoss Fuse can do! In this talk, we are going to talk about possible architectures, go through a live demo and see how it's done.

And here is the slide:



Here are some note about the transaction, when I say BPM has no transaction, I mean the automatic transaction. In BPM the transaction boundaries are between persistence nodes, so if you have 2 human tasks in the process, your process will be automatically splits into 2 or 3 transactions. If something goes wrong, BPM engine will auto roll back all nodes between persistence node. But what was done was done, say you have already called a Java bean to deduct values from databases. Although the process will start over and redo the process again, the value of data still need to handle specifically to return to original state in all the databases. But for Fuse, it can automatically rollback as it supports transactions and XA transactions for Database and JMS. It would be a great practice if we can wrap the transaction into a specific service in Fuse and allow process to call the services. If anything goes wrong, in the transaction, it will automatically row back. And Process can then be start over again, as it will also restart by BPM engine.

I hope to see you in the event next year :) 

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這個題目很多人叫我寫,可是這題目好大,這分明就是整死我咩~
所以我會分幾段慢慢寫。

JBoss 的 SubsystemDatasource WebWeb Service EJB Hibernate JMSJCAJVM 調校OS (作業系統)

先來看一下 DataSource Subsystem, DataSource 的部分主要是針對Connection Pool 做調校。

通常,程式都會需要跟資料庫界接,電腦在本機,尤其是在記憶體的運算很快,但是一旦要外部的資源連接,就是會非常的耗資源。所以現在的應用程式伺服器都會有個Pool 放一些先連接好的 資料庫connection,當程式有需要的時候就可以馬上提供,而不用花那些多餘的資源去連接資料庫。

這就是為什麼要針對Connection Pool 去做調校。

以下會討論到的參數,都是跟效能比較有關係,Datasource 還有很多參數,像是檢核connection 是否正確的,我都不會提到。如果你追求的是非常快速的效能,那我建議你一個檢核都不要加。當然,這樣就會為伺服器上面執行的程式帶來風險。這就是你要在效能與正確,安全性上面的取捨了。 (套句我朋友說的話,不可能又要馬兒好,又要馬兒不吃草的..)

最重要的調校參數就是 Connection 的 Pool 數量。(也就是那個Pool 裡面要放幾條的connection.) 這個參數是每一個應用程式都不一樣的。

min-pool-size 

Connection Pool 最少會存留的connection 數量

max-pool-size 

Connection Pool 最多可以開啓的 connection 數量

prefill

事先將connection pool 裡面建立好min-pool-size 的connection.

我的建議是觀察一下平常程式要用到的量設定為 min-pool-size 。
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