The MVC Diagram taking from Play!

Leverage browser caching by dummy configuration on Apache HTTP Server

Leverage browser caching is quite critical for web performance, especially you have , but sometime you may have your static files get changed. So you may control the risks as much as possible.

There is a cool strategy to Use fingerprinting to dynamically enable caching if you can, but if you just want to do some simple configurations with limited risks, then here is my sample httpd.conf:

 
 LoadModule headers_module modules/mod_headers.so
 ... 
 #Disable Last-Modified Response Header  
 <FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf|html|rpc)$">  
 Header unset Last-Modified  
 </FilesMatch>

 #Default Cache-control header for most static files  
 <FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">  
 Header set Cache-Control "max-age=7200, public"  
 </FilesMatch>  
 # Revalidate For No-cache files each time  
 <FilesMatch "\.nocache\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">  
 Header set Cache-Control "max-age=0, no-cache, must-revalidate"  
 </FilesMatch>  
 # Revalidate html/rpc files each time  
 <FilesMatch "\.(html|rpc)$">  
 Header set Cache-Control "max-age=0, no-cache, must-revalidate"  
 </FilesMatch>  
 # Cache "forever" due to files are given a unique name every time they are built  
 <FilesMatch "\.cache\.(html|js|png|gif)$">  
 Header set Cache-Control "max-age=2592000, public"  
 </FilesMatch>  

Let’s assume one yourapp.js has been requested for the first time and load into Disk cache:

1. when the browser requests yourapp.js within 2 hours(7200 seconds) since loaded into Disk cache, it will be load from Disk cache directly without sending any http request;

2. when the browser requests yourapp.js after 2 hours(7200 seconds) since loaded into Disk cache, it will be fetched either from static file server (200 code returned) if Etag has been changed(which means static file changes) or from Disk Cache (304 code returned) if Etag is still the same as request head brings ("if-none-match" request header) (which means static file has no changes)

3. Some no Cached files will always re-validate to the server, to check if the the file is the latest or not based on Etag

4. Some Cached files will have far further cache-control header (set to 1 month from my side), Due to every new build, the static file name will be refreshed, and we do monthly release usually.

Aggeragte Performance Profiling Data using Ruby

 require 'csv'  
 def perflogana(csvfile)  
  #initial an Two-dimensional array
   a = Array.new(1){ Array.new(4) }  
   a[0][0] = '';  # Transaction name 
   a[0][1] = 0;  # Total Response time
   a[0][2] = 0;  # Invocations
   a[0][3] = 0;  # Average Response Time
   i = 0;  
   t = 0;  
   n = 0;  
   flag = 'unfound'  
  # Read each line from CSV file  
  CSV.foreach(csvfile) do |row|  
   if (!row[1].nil?) 
      #Trim Oid for the URL using regex
      if row[1].gsub!(/\/([\d\D][^\/]+?-)+\S*/, "")
         row[1] << ")"
      end 
    b = 0;  
    # modify total response time and invocations if current line being found  
    while b <= i  
     if !a[b][0].eql?(row[1])  
       b= b+1;  
       next;  
     else  
       # modify total response time and invocations  
       a[b][1] = a[b][1] + row[2].to_s.to_i;  
       a[b][2] = a[b][2] + 1;  
       flag = 'find'  
       break;  
     end  
    end  
    #append a new line if new transaction being found  
    if flag.eql?('unfound')  
      a << [row[1],row[2].to_s.to_i,1]  
      i = i+1;  
    end  
    flag = 'unfound'  
   end  
  end  
  a.shift  
  j = a.size  
  #calculate average response time for each transaction  
  while t < j  
   a[t][3] = a[t][1]/a[t][2]  
   t = t+1;  
  end  
  # sort by avg time and print to console  
  while n < j  
   print a[n][0],",",a[n][1],",",a[n][2],",",a[n][3]  
   puts  
   n = n + 1  
  end  
 end  
 perflogana("D:\\GWT_automation\\perf\.csv");  

Enable SSL With Load Balancer on Apache HTTP server

 ------------------------------------<httpd.conf>------------------------------------  
 Listen 80
 Listen 443
 ...
 LoadModule ssl_module modules/mod_ssl.so
 ...
 SSLSessionCache    "shmcb:D:/Service/sslcert/logs/ssl_scache(512000)"  
 SSLSessionCacheTimeout 300  
 NameVirtualHost *:80  
 <VirtualHost *:80>  
      RewriteEngine On  
      RewriteCond %{HTTPS} off  
      RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}  
 </VirtualHost>  
 ProxyPass / balancer://platform/ lbmethod=byrequests  
 ProxyPassReverse / http://arch04.eng.app.com:9000   
 ProxyPassReverse / http://arch06.eng.app.com:9000  
 <Proxy balancer://platform>  
      BalancerMember http://arch04.eng.app.com:9000  
      BalancerMember http://arch06.eng.app.com:9000  
 </Proxy>  
 ProxyPreserveHost On  
 #SSL VirtualHost Conf  
 NameVirtualHost *:443  
 <VirtualHost *:443>  
      SSLEngine on  
      SSLCertificateFile "D:/Service/sslcert/Service-2013.cert"  
      SSLCertificateKeyFile "D:/Service/sslcert/Service-2013.key"  
 </VirtualHost>  
 ------------------------------------<httpd.conf>------------------------------------  

Reverse*a*Sentence*With*Ruby code

For example , if you want "One, Two, Three, Four." to be converted into “.Four ,Three ,Two ,One”, take a look at my ruby version for your reference, hope it helps in some degree :) I know you may never need this function, but some people may let you write such kind of things...

 # Ruby Version 1.9.2-p180  
 def reverseTest(inputtext)  
  @a=""  
  regextext = /[!,.;"()<>\[\]{}]/  
  arr = inputtext.split(/\s/)  
  arr.reverse_each { |item|  
   len = @a.length  
   # Dealing with a word surrounding by one or multiple punctuation  
   if item.partition(regextext).at(1)!=''  
    # Partition the word by particular punctuation, until partition by the last punctuation  
    begin  
     @a .insert(len,item.partition(regextext).at(0))  
     @a .insert(len,item.partition(regextext).at(1))  
     item = item.partition(regextext).at(2)  
    end while item.partition(regextext).at(1)!='' && item.partition(regextext).at(2)!=''  
    # When punctuation is at the end coming after a word  
    @a .insert(len,item.partition(regextext).at(0))  
    @a .insert(len,item.partition(regextext).at(1))  
    @a << ' '  
   # Dealing with a word without surrounding any punctuation  
   else  
    @a << item  
    @a << ' '  
   end  
  }  
  #Remove space at the end of the string and swap symmetry punctuation  
  @a.strip!  
  @a.gsub!(/[()<>\[\]{}]/, '('=>')', ')'=>'(', '<'=>'>', '>'=>'<', '['=>']',']'=>'[', '{'=>'}', '}'=>'{')  
  print @a  
 end  

Using JNative to load AutoITX.dll

I am working on JNative to load AutoITX.dll, and get my complex UI methods work for WebDriver.

First download JNative.jar from website then add JNative.jar to your build path.

Download your AutoITX from http://www.autoitscript.com/site/autoit/downloads/
2 useful docs which you can refer to:
Function reference
http://www.autoitscript.com/autoit3/docs/functions.htm
and AutoITX Help doc -> DLL interface introduction(Find it after installing AutoITV3)

Then start to create your own method based on AutoITX great Functions which in AutoITX.dll

Here is a sample code to create mouse move methods in Java

 package org;  
 import org.xvolks.jnative.JNative;  
 import org.xvolks.jnative.exceptions.NativeException;  
 public class LoadDllSample {  
      public static void main(String[] args) throws IllegalAccessException {  
           // TODO Auto-generated method stub            
           try {  
                GetMyMouseMove(100, 100 ,40);  
           } catch (NativeException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
           }  
      }  
      /*  
       *      AutoItX Interface For AU3_MouseMove() Function  
            AU3_API long WINAPI AU3_MouseMove(long nX, long nY, long nSpeed);  
       */  
      public static void GetMyMouseMove(int x, int y, int s) throws NativeException, IllegalAccessException{  
           JNative nGetMyMouseMove = new JNative("C:\\Program Files\\AutoIt3\\AutoItX\\AutoItX3.dll", "AU3_MouseMove");  //load .dll file and specific func
           nGetMyMouseMove.setParameter(0,x);//The screen x coordinate to move the mouse to.  
           nGetMyMouseMove.setParameter(1,y);//The screen y coordinate to move the mouse to.  
           nGetMyMouseMove.setParameter(2,s);//The speed s to move the mouse (optional)  
           nGetMyMouseMove.invoke();  
           return;  
      }  
 }  

I will work on more functions and hope they may help my WebDriver automation tests soon :) Enjoy!

Update: The source code has been uploaded to my github, check it out if you like : https://github.com/joychester/AutoIT-in-Java

Profiling OSGi project with Btrace

I met "java.lang.NoClassDefFoundError" when i did profiling with my OSGi project:

Error com.myapp.template.TemplateServlet - TemplateServlet.doGet() exception
java.lang.NoClassDefFoundError: CodeLineTiming at com.myapp.service.proxy.abc.impl.ServiceProxyImpl.$btrace$CodeLineTiming$onCall(ServiceProxyImpl.java) at com.myapp.service.proxy.abc.impl.ServiceProxyImpl.getRfpWithChangeLog(ServiceProxyImpl.java:467) at
...

So two things need to be modified from my side:
1. add package to btrace code , for example "package com.sun.btrace.samples;"

 
 package com.sun.btrace.samples; 

 import com.sun.btrace.annotations.*;  
 import static com.sun.btrace.BTraceUtils.*;  
 import com.sun.btrace.aggregation.*;  
 @BTrace  
 public class MethodResponseTime {  
...
}

2. add OSGI config.properties in felix/conf/ to include org.osgi.framework.bootdelegation=com.sun.btrace,com.sun.btrace.*

Then start your application, enjoy profiling with Btrace:)

Thanks for @yardus great help and also good post from this: http://blogs.sun.com/binublog/entry/glassfish_v3_profiling

Making VisualVM as a Windows service on remote server

I am often Adding a remote JMX connection to the VisualVM to do monitoring work to capture JVM performance status. however, some of application are running as a windows service remotely, so i can not use Btrace Workbench then. if you do not want to change the Windows service back to console mode, then here is what I solved mine:

PS:Making sure Latest JDK1.6 installed for getting jVisualVM and Btrace, more info please refer to https://visualvm.dev.java.net/pluginscenters.html, your JAVA_HOME can be a separate one for your java application.

Step1: Remote to the application server using a console mode: mstsc /console /v:(For Winows server 2003 or winXP sp2) or admin mode:mstsc /admin /v:(Windows XP Service Pack 3, Windows Vista Service Pack 1 and Windows Server 2008 or later), why? please see this link

Step2: Use AppToService.exe to create VisualVM as a Windows service
Type such command line in cmd:

AppToService.exe /Install "C:\Program Files\Java\jdk1.6.0_24\bin\jvisualvm.exe" /AbsName:"VisualVM" /Interact:1

Step3: Start the "VisualVM" in Services

So you can see the VisualVM will launch on your remote desktop, then the Java process on that server running as a service can be monitoring as a local process.

Some Useful References:
http://blogs.sun.com/nbprofiler/entry/monitoring_java_processes_running_as
http://vicevoice.blogspot.com/2009/09/vaas-visualvm-as-service.html
http://www.microsoftnow.com/2008/01/no-more-mstscexe-console.html
More update from Sun blog： https://blogs.oracle.com/nbprofiler/entry/monitoring_java_processes_running_as My Friend Roy and Rudy's help as well:)

消失的纯白2011--A flash Game of my good Friend

转载我一个好朋友自创的Flash Game，在新的一年里,祝福他和他的家人--坚强，幸福！

A decade from my High School Graduation