Kevin.Gao.Blog()

Hi Everyone,

Happy new year.

Wish you and your family all the best in 2010.

Kevin Gao

Dynamic Web TWAIN is an ActiveX control and optimized for web applications. Dynamic Web TWAIN has been very popular. It is widely used in government, health care, insurance, policing and many other industries.

We are releasing a new TWAIN component, Dynamsoft .NET TWAIN, which is developed in C# and uses managed code. We are doing the release test of Dynamsoft .NET TWAIN and expecting to release it in the coming months.

Stay tuned.

As the architect of SourceAnywhere for VSS, I was asked by many users about the performance of SourceAnywhere for VSS compared with other products.

Recently, I did the test. Now I am posting the result here with the hope that it can save your time evaluating different SourceSafe remote access tools. I mainly focus on the features and remote-access performance comparison.

Below is the result:

Feature Comparison

Features		SourceOffSite
Performance Features
Data compression
Client/Server architecture
Cache Server
Delta Transfer
Multithread file transfer
Security Features
Client/Server Architecture
Blowfish encryption
128 SSL
Password policy
Independent VSS database access control
IDE Integration
Visual Studio 6/2003/2005/2008
SQL Server 2005
Eclipse Plug-in
Dreamweaver
Cross Platform
Windows
Linux
Mac
Solaris
AIX
SCO
Any Java compatible platform

Performance Test

Result: (Unit: second)

Test Environment:
There are 3 machines used in the test:

Server : CPU Intel P4 2.66G, 256M RAM, Win 2003 Std sp1; SourceAnywhere for VSS Server 5.3.1; SourceOffSite Server 4.2

Client: CPU Intel P4 3.0G, 512M RAM, 160GB 5400RPM HD, Win XP sp2; SourceAnywhere for VSS Server 5.3.1; SourceOffSite Client 4.2

Cache server: CPU Intel Celeron 2.66G, 512M RAM, 160GB 5400RPM HD, Win2003 Std SP1; SourceAnywhere for VSS Cache Server 5.3.1

Broadband connection is used between the client and server machine.

The cache server and client are on the same LAN, which connects to the server through office ADSL.

Test Software:

SourceAnywhere for VSS 5.4, SourceAnywhere for VSS 5.4 Cache Server 5.4, SourceAnywhere for VSS Client 5.4.

SourceOffSite Server 4.2, SourceOffSite Client 4.2.

Test Data:

1. A project with 1,500 files; Total size is 17.1 MB.
2. 1,000 changed files (used for check-in).
3. Server and Client machines are restarted before each test.

I attached the test data I used here. You can download it and do the test in your own environment if you like.

Test method:

Every operation is carried out 5 times. The highest and lowest results are eliminated. The average value is calculated.

CSharpJavaMerger Framework is free and open source. It is developed by Dynamsoft. CSharpJavaMerger Framework isn’t perfect yet. Developers who are interested at the software are most welcome to get involved in the following ways:

• Edit web pages
  The ones register will be granted with commit right to the wiki-type articles. To join KevinGao.net, you can register an account here:
  http://www.kevingao.net/wp-login

  After registering, you will receive an email including the password for your account. You can then log in KevinGao.net and make changes to the article.

  You can find the wiki-type articles in Recent contributions to Wiki section at the bottom of Dashboard page.
  　

• Write Code
  If you wish to contribute source code of CSharpJavaMerfer via SCM Anywhere Hosted, please contact Kevin Gao at kgao@dynamsoft.com with notice of your intension. He will give you an account of SCM Anywhere Hosted with change/commit right.
  　
• Submit feature requests or bug reports
  If you have any feature requests or find any bugs, you can submit or update tickets in the Issue Tracking Explorer of SC M Anywhere Hosted:
  http://www.scmsoftwareconfigurationmanagement.com/help/SCM%20Hosted/Issue-Tracking/Issue.htm

Links:
Previous article >>>>: License
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WCF & Java Interop series home page: CSharpJavaMerger Framework

CSharpJavaMerger is distributed under General Public License (GPL).

Links:
Previous article >>>>: How to write Java code?
Next article >>>>: Get involved
WCF & Java Interop series home page: CSharpJavaMerger Framework

• Use “class” instead of “interface” in enumerations and add “public final static” keywords before enumerations.For example:
  
public class EnumEOL
{
  public final static int enumEOLNative = 0;
  public final static int enumEOLWindowsCRLF = 1;
  public final static int enumEOLUnixCR = 2;
  public final static int enumEOLMacLF = 3;
}
• Don’t use “e.printStackTrace” in try… catch and System.out.println(e.getStackTrace(…)) in classes.
• Don’t use annotations like @Override, @suppresswarning.
• Use “CompareTo” and “CompareToIgnoreCace” to compare strings. Don’t use “equels ()” or “==”.
• Replace all “String” with “CString”, which is a class defined in the CSharpJavaMerger Framework, except for the following two places:
  • Don’t change the “String” in “String Object”.
  • Don’t change the “String” in string constant. For example, public final static String VSSVER= “vssver.scc”

  Two things to notice:

  • Use “string == null” instead of “CSting == null || CString.getValue() == null”.
  • The logic of Substring (int, int) is changed. The meaning of the 1st parameter is the same in C# and Java, while the 2nd one not. The 2nd parameter is the subscript of the substring in Java, and it means the length of the substring in C#. The substring of “CString” here is same with substring in C#.
• Use Debug.Assert (b) instead of assert (b). Debug is a class defined in CSharpJavaMerger Framework.
• Omit “public” keyword in the member functions in interfaces.
• Make sure the subclasses’ functions, including returned value, function names, parameter list, are different from that of the superclass prototype, except implementation classes of Abstract and interface.
• The name convention for variables of checkbox control variables: m_chk, for example, m_chkUseSSL.
• Exception processing
  • Only catch the exceptions in java.lang.Exception, which is a base class of Java.
    After caching an exception, if any functions in java.lang.Exception need to be called, please add the objects in the constructor of CException, new an object of CException and call the according function of CException.For example:
    try
  {
    //...
  }
  catch(Exception e1)
  {
    CException exp = new CException(e1);
    CString str = exp.GetMessage()
  }
  • Use e.GetMessage() instead of e.getLocaleMessage().
• File, I/O classes processing
  • Use CFile instead of File. CFile is a class in CSharpJava Framework. The class is used to judge file path, whether file exists or not, file’s properties, and whether files is deleted.
  • Use FileStream to read/write binary.
  • Use StreamWriter/StreamReader to read/write text.
  • Use CFileInputStream to read all files.
  • Use CFileOutputStream to write to all files.
• Use “DateTime” instead of “Calendar”. DateTime is a function in CSharepJavaMerger Framework.
• Use Guid instead of UUID.
• Omit Constructors called by Constructors. Replace “this ()” in Constructors with corresponding functions.
• Add “break” before Default in switch case.
• Use Boolean instead of Boolean. Boolean is a system class.
• Replace Anonymous inner classes with inner or common classes.
  • Use List, Map etc instead of ArrayList, HashMap for statement. For example:
    Use: CList list = CList();
    Instead of ：ArrayList list = ArrayList()
• There may be some tricks when adding strings. For example:
  • CString str1 = new CString(”hello”);
  • CString str2 = new CString(”world” + str1);
    //This line can be compiled successfully.
    //However, what you want may be CString str2 = new CString(”World” + str1.getValue());
• Use CThread instead of Thread.
• Use DESUtil instead of DES.
• Capitalize the name of all packages.
• Replace the function used for sorting “Collections.sort(listChangeSet,comparator);” with “list.Sort(Comparer comparer);”. Compare in a class in CSharepJavaMerger Framework.
  For example, use the following code:
  
class SortListComparator extends Comparer<Object>
{
  public int Compare(Object obj1, Object obj2)
  ...
}
  Rather than:
  
class SortListComparator implements Comparator<Object>
{
  public int compare(Object obj1, Object obj2)
  ...
}
• Use CMap instead of Map. For example:
  Use:
  “CMap map = new CMap();”
  Instead of:
  “Map map = new HashMap();”
• Don’t use Integer and Long system functions.
• Change private inner constructors to be public.
• If a member variable of a private inner class needs to be used by its external classes, please change the member variable to public.
• If you want to convert between CString and Long, integer, please use Str.ToLong() instead of new Long(CString.GetValue).longValue().
• Add [] before array definition like this:
  String [] var = null
• Don’t use keywords as variables. For example,
  Do not use “out” which is in CFileStream out;.
• Don’t get the string out of CString and then call the functions of String. For example:
  • Don’t use the following way: CString str; str.GetValue().compareTo
  • Other classes either. Don’t get the system classes and then call system functions.
• Don’t use the following functions:
  • Integer.intValue()
  • new Integer()
  • new Long
  • Long.longValue()
• If conditional expression (? : ) uses string, it’s not CString.

Links:
Previous article >>>>: How to write C# code?
Next article >>>>: License
WCF & Java Interop series home page: CSharpJavaMerger Framework