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Red Hat JBoss Fuse - Tools make your world go round, the demo

Few days ago I posted the slides of what suppose to my vJBug presentation, for the talk, I have planned to showcase the tooling by showing what a developer would normally do when they would develop application with JBoss Developer Studio.  Here are the things I go over,
  • How to debug Camel application using the tooling provides.
  • Data mapping between POJO and XML, JSON with Dozer with drag and drops only. 
  • Deploy and package an OSGi ready Applications. 
The story of the demo was pretty simple, it's a bookstore integration application, takes in order in XML format, in the xml, contains multiple orders, each order will have the customer information, and has the list of books the customer would like to order. 

<?xml version="1.0" encoding="UTF-8"?>
<order product="electronics" id="2012_0001">
<customer id="A0001">
            <name>Antwerp Zoo</name>
                <article id="A0001">
                <article id="A0011">
<order product="books" id="2012_0002">
<customer id="A0002">
            <name>Antwerp Zoa</name>
                <article id="B0002">
                <article id="B0202">

We are going to process the order, if the customer is VIP by convert each orderline (book) into Java POJO and print the POJO, for non-VIP customers, we are simply going to print out the XML part of the entire order.  Here is the video of the demo, please enjoy it. 


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JBoss EAP 6 - 效能調校 (一) DataSource 的 Connection Pool

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。

最近我最疼愛的小貓Puji 因為膀胱結石開刀的時候過世了,心情很差請原諒我的口氣沒有很好,也沒有心情寫部落格。

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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。


Connection Pool 最少會存留的connection 數量


Connection Pool 最多可以開啓的 connection 數量


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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