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Red Hat JBoss Fuse - 3 ways to develop you Fuse application in JBoss EAP, Spring DSL

Last post we talked about how to get your EAP Fuse ready, now it's time to start developing, there are several ways to do this
  • Spring Framework
  • CDI with Java DSL
  • XML without Spring
In this series post I am going to show the above ways of creating a web application running in JBoss EAP. To make things clear and easy, I will be using the exact same Camel route for all there different methods.What this Camel route does, is it starts up a timer that will log every 5 second, simple, easy, not much going on.

Before we start develop our simple camel route, we need to a base WAR project to work on, so first we need to create a WAR file, I am sure you must have a million way to create that, every one sort of have their own best practice for this. For me, in the example, I will create one with maven, using the webapp-javaee6 artifact. 

A. Create Project, select Maven Project, 

B. Click Next when you are at New Maven Project, and it will take you to the next step, select the webapp-javaee6 artifact.

C. Add your project name, and then click Next, you will have a ready to go WAR project in your JBoss Developer Studio. (Note, for my examples later, I am going to give them different project Names)

D. Add Camel dependency in the pom.xml file (do make sure you maven repo is configure properly pointing to http://repo.fusesource.com/nexus/content/repositories/releases)

    <!-- camel -->
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-core</artifactId>
      <version>2.15.1.redhat-621xxx</version>
      <scope>provided</scope>
    </dependency>


E. Optional, change your JDK version accordingly in pom.xml of the WAR project.




Spring DSL

The easiest to add you camel route the WAR application is adding an Spring DSL Camel route application in the classpath, note the file will be automatically pickup by the Camel Subsystem in JBoss EAP with name matching *-camel-context.xml.

  • Create a new WAR project, with this project, I am going to name it "mySpringdemo", find your "webapp" folder, create a "META-INF" folder for all the Camel file, please note, your camel files does not have to be in here, it should work as long as it's in the classpath, I am only placing it here so it's nice and tidy. 





  • Create Camel route called myfisrt-camel-context.xml in META-INF folder. Make sure it is set to "Spring" framework.




  • Within route, drag and drop timer and log component and configure them. 
    • Timer URI: timer:mytimer?period=5000
    • Log Message: Spring EAP Camel Demo
  • This is what your Spring DSL look like: 
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:camel="http://camel.apache.org/schema/spring"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

  <camelContext trace="false" xmlns="http://camel.apache.org/schema/spring">
   <route>
    <from uri="timer:mytimer?period=5000"/>
    <log message="Spring EAP Camel Demo"/>
   </route>
  </camelContext>
</beans>

  • And then we are done, ready to go. Run mvn clean install to generate the war file. 





  • Start up your JBoss EAP with Fuse subsystem enabled. If you are not sure how to do it, please take a look at this post. In side bin folder, start JBoss EAP with 
    • standalone.sh
    • standalone.bat
  • Go to http://localhost:9990/, login to admin console, under Runtime/


  • Click on Add, choose the war generated under the project target folder. Click Next, Next to deploy the application. 



  • Start up application by click on the En/Disable button. 

  • Switch to the log, you will find it's now printing the message "Spring EAP Camel Demo" every 5 seconds.


Next, we are going to talk about using the Java DSL in EAP. 

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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..)

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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.

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