How To: Test Activemq 5.9.1 Master/Slave by replicatedLevelDB/Zookeeper

Start from 5.9, Activemq comes with another HA option called ReplicatedLevelDB. I would recommend start from 5.9.1 at least, and I found a lot bugs in the 5.9.
  basic idea, Zookeeper as the central coordination point, every broker talked to the Zk , ZK wills tell the member information like who is the master. slave talks to master node to fetch the incremental change when it come online.
 
for the configuration, each member in a cluster share the same broker name, zookeepeer address, and zkPass.

and transportconnector is transparent to the underlining persistence layer.

when you startup the broker, for the 1st one, since we setup the replica to 2,that means we have to start at least 2 brokers to meet the quota requirement.
 

after 2 broker ready, you can see it’s a slave node,

for the 1st ndoe, which is the master node, will turn on the transportconnector that is openwire here,

3rd one will be a slave node too.

How To: test Activemq using Maven plugins

ActiveMQ has two useful Maven plugins which enable you to test different Activemq deployment layout and Performace (Producer/Consumer) quickly. the plugins have been renamed since 5.7, and this demo is based on latest version 5.9.

Demo: Setup one standard broker quickly.

Create one maven eclipse project, and add the plugin dependency called activemq-maven-plugin to the POM file.

Now the pom.xml looks like this

for this plugin , we will add configuration later on this plugin, like the Activem.xml config, etc.
now by default, we can run the plugin on the command

then A simple queue broker is there, and by default using the openwire transport and memoryPersistenceAdapter.

TO Change the configuration, we can customize the plugin.
we setup the persistent=true and use 8888 as the openwire port.

Run Again,


if we want to change it to levelDB or more customized setting,

 

For the producer, you can setup another plugin, here I setup two profile, one for producer and another one is for consumer

the for producer, you can add different settings by passed –D to the command,

and consumer,

to start another consumer , change the prefix , otherwise, they want get any message, since they use the same consumerid

after done, you should see some test results, like

SoapUI, Groovy Script tutorial

Groovy is built on JVM, so does the SoapUI, it’s no surprise that SoapUI offers the Groovy script support by default. Let’s do a simple test, basically send out a Http request with dynamic parameters, and parse the result using the regular expression capability of Groovy and IO capablity to save the result back to a file. for the parameter we can use the groorvy to poll a file and return some randomized keywords.

so the keywords file looks like

we create one project with one test suite, then under the suite, we can add test case, and for the test step, let’s add first step called GetKeyword as a groovy script.

then we put some script here, which will assign a keyword property to the context randomly.


then we can access this keyword using context.keyword in next step, now, let’s create a http request to bing.com

Click extract params,now if we run this test

the query keyword is hardcoded, we can replace it with a groovy expression

then add the 3rd step, that we read the response in step 2 and save it to a file

if we run the test case, you will see file named keyword.txt with the http response from bing.com search

also you can just copy and save the following xml as a project file, you open in in SoapUI

<?xml version="1.0" encoding="UTF-8"?> <con:soapui-project activeEnvironment="Default" name="tst" soapui-version="4.6.4" xmlns:con="http://eviware.com/soapui/config"><con:settings/><con:testSuite name="testgroovy"><con:settings/><con:runType>SEQUENTIAL</con:runType><con:testCase failOnError="true" failTestCaseOnErrors="true" keepSession="false" maxResults="0" name="TestCase 1" searchProperties="true" id="cdd185b8-b6ae-4455-9713-ec70b5404569"><con:settings/><con:testStep type="groovy" name="GetKeyword"><con:settings/><con:config><script>def file=new File("c:\\a.txt") def lines=file.readLines(); def randomindex=new Random() def keyword=lines[randomindex.nextInt(lines.size())]; context.keyword=keyword log.info(keyword)</script></con:config></con:testStep><con:testStep type="httprequest" name="Req2Bing"><con:settings/><con:config method="GET" xsi:type="con:HttpRequest" name="Req2Bing" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><con:settings><con:setting id="com.eviware.soapui.impl.wsdl.WsdlRequest@request-headers">&lt;xml-fragment/></con:setting></con:settings><con:endpoint>http://www.bing.com/search</con:endpoint><con:request/><con:credentials><con:authType>Global HTTP Settings</con:authType></con:credentials><con:jmsConfig JMSDeliveryMode="PERSISTENT"/><con:jmsPropertyConfig/><con:parameters><con:parameter><con:name>q</con:name><con:value>${=context.keyword}</con:value><con:style>QUERY</con:style><con:default>androidyou</con:default><con:path xsi:nil="true"/><con:description xsi:nil="true"/></con:parameter></con:parameters></con:config></con:testStep><con:testStep type="groovy" name="SaveitToFile"><con:settings/><con:config><script>def resp=testRunner.getTestCase().getTestStepByName("Req2Bing").httpRequest.response def raw=resp.getContentAsString() //save it fo file def resultFile=new File("c:\\" + context.keyword + "t.txt") resultFile.write(raw);</script></con:config></con:testStep><con:properties/></con:testCase><con:properties/></con:testSuite><con:properties/><con:wssContainer/></con:soapui-project>

WMIC Tips, Export format and get hint about callable Actions

On windows , you can use wmic to list all process running by type process in the wmic console.

Also you can run some filter, like listing all  notepad.exe
procecss where name=”notepad.exe” list brief

if we don’t know which field are available to get for this Process object, try get /?

so we can call process where name=”notepad.exe” get commandline, name, processid

if we want to kill those processes, we can call call /? to see available actions

So we can call terninate method to kill all notepad.exe

then all process are gone,

we can do this same thing on service,

to export all the service you can run wmic /output:file  service where state=”running” /format:htable

Apache Archiva, yet another simple Maven repository in your enterprise

Before I got a chance to play Archiva, I’ve always used the Nexus as the my maven repository across different machines. Now it turns out the Archiva is very easy to use and pretty powerful for most features I used in Nexus.
  Apache archiva is s standard jsp application, we can hosted in any container or just run as standalone,


the major usage of Archiva for me is to use it as a central repository to store all my artifacts. Basically when you are done with your project, run a “maven deploy” it will deploy it to your central repository, then across the computers you work, you can find those jars both on runtime or compile time. 

To do that, we need config a setting on the ~/.m2/settings.xml, put the server credentials there , and one your project pom file, put the repository as one of the distributionManagement subnode.

on the settings.xml,
add my own repositories that are proxyed and cached to remote,


then on the client pom.xml. just add the repository to the distributionmgmt

then once we run the mvn deploy, it will be deployed to the centorl internal repo.

Apache Camel tutorial : Quick start from scratch (Console App using Xml as the routes definition , without Spring)

Following the last post Apache Camel tutorial : Quick start from scratch (Console App , without Spring), if you don’t want to hard code the routes, we can simply use xml as keep the routes definition.

to do that , let’s change the code a little bit.

then in the route.xml, add the route definition there,

when run, you see the similar results,

for this code, check the branch demoxml

https://github.com/ryandh/apacheCamelTutorial/tree/demoxml

Apache Camel tutorial : Quick start from scratch (Console App , without Spring)

Apache Camel is one great implementation of the EIP pattern, If you are not a seasoned Spring/Java developer , you might found it’s hard to get started, the goal of this post is simplify that process and show you how easy to get started without remember any code snippet. we will use plain console app to host and start one camel route.

to get started, simply open eclipse and create one maven project (the purpose of maven here is to add those dependency automatically), if you don’t have any maven experience, you can simply download the required jar and add to you build path.

Create one Maven project , using the simple project type, we get one project with maven ready,

Create one simple class with main method,

Now , right click pom.xml, click maven menu,  add a dependency to camel-core, you can simply search camel-core

Now, we can start coding,

we’ve initialized the camelcontext, next step is adding our routes by xml or java code.

let’s start from java code first, since it has intelligence and life is little bit easier,

it looks like we can just add one RoutesBuilder to the context, is there any existing one, or we have to build our own.
ask the eclipse create a local variable for the routesbuilder, let’s see whether there is any existing one,

it turns out Routesbuilder is a interface, and have RoutesBuilder as an implementation, so let’s extends that one,

then the code looks like this,

in the configure , we just inject the code snippets listed on the camel component page, here is one demo, that dump out some message every 2 seconds,

if we run this, we can see the message get shown in the console every 2 seconds.

for the log component, we can’t see the message because it is NOP for slf4j by default, so lets add a slf4j-simple to the pom.xml

run again, you can see the message is listed in the console window.


if we want to export this as a executable jar, go to the pom.xml ,right click maven menu to add a mvn-assemly-plugin

Change the pom.xml a little big , pint to the mainclass , you can copy the xml here

then go to the project folder, run mvn compile assemlby : Single

you will see a jar in the target folder,

Now, we can run the jar directly, by typing java –jar pathtothejar

for the source code, check it out here, https://github.com/ryandh/apacheCamelTutorial/tree/DemoConsole