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JBoss Fuse - Fuse workshop 101 - Part Four

This is probably the easiest part of the entire Camel 101 workshop.  It's very similar with Bean injection in Spring, so with the IoC in mind, in Camel we do the same thing.

First we create our POJO, In side each POJO has either your customize and the business logic, which are the most valuable part in the entire system, or just any helper code you would like to use while developing. The reason for this is to keep things easy to maintain and to have a much more light weight framework.

As soon as we got the POJO or Java Bean, we are ready to register it into the "Registry". In Camel there are few registry available.

  • Simple
  • JNDI
  • ApplicationContext
  • OSGi 

Basically, they are just different place to store your Registry, you can probably guess it by it's name. We use SimpleRegistry mainly in Testing, when you want to use Maps to store your Registry. And obviously JNDI is the default in Camel project. And if you have Spring or OSGi you can always register it there! With JBoss Fuse Project, there is no need to worry about this. We use mostly ApplicationContextRegistry. Then we can "reference" this bean from the route within each Camel Context.

The diagram below shows you how to do it.


It's as simple as that!
About the parameter you pass into the method of POJO, Camel is going to automatically map everything from the body for you, if you have not specifically specified in your reference. Camel actually use runtime look up, so don't expect any error message of misconfigure or misspell during compilation time.

The slide for the workshop are here:


In this exercise, we continue on building the stock trading system, putting real business code that calculate how much money of this person that needs to deduct from this stock trade. As well as that, to speed up the process for VIPs, the vendor decide to introduce Messaging Queue to the game. We now need to deliver the trading into via messaging.


 
Lab instructions are here:



Here are the other parts of the workshops!
Workshop part 1 - Camel basic and components
Workshop part 2 - Data Transformation 
Workshop part 3 - Enterprise Integration Pattern

Comments

Wasn't very clear to me in workshop but found out that I needed to put the elements just after the element, and not inside or .

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效能沒有什麼Best Practice, 反正能調整的就那些。 通常,一個程式的效能大概有70-80% 都跟程式怎麼寫的其實比較有關係。

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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 。
加上…

JBoss Fuse - Fuse workshop 101 - Part One

On my way to Hong Kong for a day of workshop on JBoss Fuse, and as I go through my Slide deck, I cannot find any decent easy workshop for beginners. Therefore I decide make a workshop that is easy for Camel first timer to get their hands dirty.

The first of part of the workshop is an introduction to Camel, it first goes through what is exactly inside JBoss Fuse.

For part one of the workshop, it takes your through the very basic of Camel, one of the very important component inside JBoss Fuse.
Every Camel need to have a runtime container to run in, inside camel we call it a CAMEL CONTEXT.  Inside every Camel context, you can define lots of camel route and registry, don't worry about what those are, we will explain later.


So inside out blueprint xml, you will see a tag called camelContext.



Next up is camel route, they are a chain of command or process defined by you, as a developer.
Inside the camel route, there are consumer endpoints that listens to the incoming messages, producers …