Are we there yet ? Sameer Tyagi's Blog Honesty is the best policy, but insanity is a better defense.

RESTful Web Services with JAX-WS

JAXWS 2.0.1 Performance Improvements

JAXRPC vs JAX-WS 2.0

JAXWS 2.0 vs JAX-WS 2.0.1

JAX-RPC 1.1 vs JAX-WS 2.0.1

• Revisiting some of the key abstractions
  • For example. avioded using StAX and going straight from JAXB to OutputStream. This reduces the number of layers and avoids the escaping, character encoding and namespace management done by StAX.
  • Better handling of properties Prior to JAXWS 2.0.1 a HashMap was used to hold properties that were all pre-evaluated and in fact read more often than written.In JAX-WS 2.0.1 a distributed property set with lazy evaluation is used.
• Collapsing the stack where ever possible
  • For example, initially a byte image of the whole message was kept around and a DOM built for the whole message to access headers. This inadvertently led to XML being parsed twice.
    To avoid this JAXWS 2.0.1 uses a stream buffer which records infoset to necklace-like data structure and allows it to be replayed later. It's not randomly accessible though.
    It supports various XML API's. Eg reads via XMLStreamReader and writes via XMLStreamWriter; or fire SAX events to ContentHandler.
• Reducing the number of special purpose interfaces.
  • For example no more custom hooks for JavaEE
  • Better handling of endpointaddress property. In JAXWS 2.0 implementation this was stored in a string and then converted to a new URL() everytime. In the 2.0.1 implmentation its stored as a URL in the distributed property set and a URI is created for storing proxy information which is used by the JDK's URL.openStream()

750cc's of pure power

SWE 645 @ George Mason University

Tango performance

DWR and Web Services

<script type='text/javascript' src='/docliteralfromwsdl-war/dwr/interface/POServiceDAO.js'></script>
<script type='text/javascript' src='/docliteralfromwsdl-war/dwr/engine.js'></script>
<script type='text/javascript' src='/docliteralfromwsdl-war/dwr/util.js'></script>
<script>
  function createPO() {
    POServiceDAO.createPO(showPO);
  }
  function showPO(order){
   	document.getElementById("field1").innerHTML = DWRUtil.toDescriptiveString(order, 2);
   	sendPO(order);
    }
  function sendPO(order){
		 POServiceDAO.sendPO(showStatus,order);
  	}
  function showStatus(status) {
    document.getElementById("field2").innerHTML = status.timestamp ;
    document.getElementById("field3").innerHTML = status.orderid ;
  }
</script>

Accelerating Java XML digital signature performance

Who's tapping my brainwaves ?

Accessing JAX-WS endpoints with Java WebStart

<?xml version="1.0" encoding="utf-8"?>
 <jnlp spec="1.0+" codebase="http://localhost:8080" href="webstart.jnlp">
 <information>
 <title>JAX-WS WebStart Demo</title>
 <vendor>Sun Microsystems</vendor>
 <homepage href="http://localhost:8080" />
 <description>A Java Webstart test</description>
 </information>
 <resources>
 <j2se version="1.5+" />
 <jar href="SignedApplet.jar" />
 <jar href="sjavaee.jar" />
 <jar href="sappserv-ws.jar" />
 </resources>
 <security>
 <all-permissions />
 </security>
 <applet-desc main-class="JAXWSApplet" name="JAXWSApplet" width="640" height="256"/>
 <param name="endpointURL" value="http://localhost:8080/docliteralfromwsdl-war/jaxws"/>
 </applet-desc>
 </jnlp>

Accessing JAX-WS endpoints from Applets

Have iPod - Will get hit by lightning

Mice that smoke and drink

Birds dropping Acid in LA

Many faces of Bombay

Birds without wings, words of wisdom and David Gray

Resonate

Need weed ? Go to Home Depot.

American image in India

Parking tickets suck !

JAX-WS and the upcoming Apocalypse

Real World Web Services Performance on CoolThreads

	Out of the box scalability for the SunFire T1000 and T2000 boxes (CoolThreads technology)Glassfish using an internally developed macro benchmark that stresses all of the JWSDP API's (JAX-WS, JAX-RPC,JAXB, StAX, XWSS etc) and simulates a real world web services application middle tier application.
	Scalability with some tunings on the JVM and the application server such as acceptor threads > number of users

Money to burn & devices to buy

US Missile base for sale on eBay

Crazy

Performance for RESTful Web Services with JAX-WS

	RESTful web services with JAX-WS show some interesting performance characteristics. I ran some tests with WSTest/Japex. The first graphic shows a comparison of a few different method calls using a RESTful endpoint and a WSDL based SOAP endpoint - both doing the same thing i.e accepting XML, Unmarshalling it with JAXB, doing something and Marshalling results back using JAXB. The client does no work in both cases and uses POST operations. As seen, the performance is more or less the same in the firt tests but tends to do better for the non-rest cases for the medium and larger paylods. This is probably more because of the tight integration in the non-rest case between JAX-WS and JAXB with optimized code paths rather than anything else.
	In another comparison for the same endpoints (RESTful and WSDL based) with a filp on the client for an HTTP GET/POST each, shows how for the POST operation the performance is slightly better for the REST endpoint and significantly better for the GET operation. This is because the test sends the same XML request data and can leverage the HTTP caching framework provided by the server for GET operations. Glassfish servlet/jsp caching details can be found here but with no config the default is 30sec, enough for our test.
	So how do endpoints compare when the caching framework is not leveraged (request data is randomized) ? RESTful endpoints perform slightly better but as expected there is almost no difference in GET/POST operations for the same RESTful endpoint.

Some J1 2006 sessions

Protest music 2006

Nickle and Dimed

Hanging monkeys

During a recent Security walkthrough, a figurine of a monkey was found hanging from a emergency strobe 
light in one of the Burlington Campus buildings.  Hanging anything from emergency strobes, exit signs 
or sprinkler systems is strictly prohibited. We would appreciate your cooperation in meeting this safety code.

Path_info showing up as null in Glassfish JAX-WS

 <servlet-mapping>
    <servlet-name>sample_webservice</servlet-name>
    <url-pattern>/jaxws/*</url-pattern>
 </servlet-mapping>

Hudson build tool

Sri Lankan hip-hop-bibbity-bop dillema

Self help 101@Sun

Someone needs a new routing algorithm

Why I work at Sun ?

Server GC in CLR

 <Configuration>
 <runtime>
 <gcServer enabled=“true“ />
 </runtime>
 </Configuration>

<configuration>
 <runtime> 
 <gcConcurrent enabled="false"/>
 </runtime>
 </configuration> 

CLR Native JIT'ing

C:\TEMP\TestApp\TestApp\bin\Release>ngen install TestApp.exe
Microsoft (R) CLR Native Image Generator - Version 2.0.50727.42
Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
Installing assembly C:\TEMP\TestApp\TestApp\bin\Release\TestApp.exe
Compiling 1 assembly:
    Compiling assembly C:\TEMP\TestApp\TestApp\bin\Release\TestApp.exe ...
TestApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null

C:\WINNT\assembly\NativeImages_v2.0.50727_32\TestApp\3d175dbade97d648b002a9881f995ca8>dir
Directory of C:\WINNT\assembly\NativeImages_v2.0.50727_32\TestApp\3d175dbade97d648b002a9881f995ca8
04/06/2006  08:12 PM              .
04/06/2006  08:12 PM              ..
04/06/2006  08:12 PM            13,824 TestApp.ni.exe
               1 File(s)         13,824 bytes
               2 Dir(s)     774,688,768 bytes free

Too far gone

An Apple a day, kept Windows at bay - till now anyways

Someone stop the iPod madness

Playing in the cold

Runaway boyfriend - no reward offered ?

Oracle Spatial Database

 slect ... where sdo_filter (mycolumname ,sdo_geometry(2003,null,null,sdo_elem_info_array(1,1003,3),sdo_ordinate_array (0,0,600,800))) = 'TRUE' 

On Snow Patrol

C# and SubMaps

TreeMap  sortedMap = new TreeMap ();
for(int i = 0;i<10;i++)
    sortedMap.put("SomeKey_"+i, "SomeValue");
System.out.println(sortedMap);
String low = "SomeKey_3", high = "SomeKey~";
System.out.println(low);
System.out.println(high); 

{SomeKey_0=SomeValue, SomeKey_1=SomeValue, SomeKey_2=SomeValue, SomeKey_3=SomeValue, SomeKey_4=SomeValue,
 SomeKey_5=SomeValue, SomeKey_6=SomeValue, SomeKey_7=SomeValue, SomeKey_8=SomeValue, SomeKey_9=SomeValue}
SomeKey_3
SomeKey~
{SomeKey_3=SomeValue, SomeKey_4=SomeValue, SomeKey_5=SomeValue, SomeKey_6=SomeValue, SomeKey_7=SomeValue, 
SomeKey_8=SomeValue, SomeKey_9=SomeValue}

 public static SortedList SubMap(SortedList list, System.Object lowerLimit, System.Object upperLimit) {
            string upperStr = upperLimit.ToString();
              if (upperStr.EndsWith("~"))
                upperLimit = upperStr.Replace("~", "999999999999999");
            Comparer comparer = Comparer.Default;
            SortedList newList = new SortedList();
            if (list != null){
                if ((list.Count > 0) &&(comparer.Compare(lowerLimit,upperLimit) <1)){
                    int index = 0;
                    while (comparer.Compare(list.GetKey(index), lowerLimit) < 0)
                        index++;
                    for (; index < list.Count; index++){
                        if (comparer.Compare(list.GetKey(index), upperLimit) > 0)
                            break;
                          newList.Add(list.GetKey(index), list[list.GetKey(index)]);
                    }
                }
            }
            return newList;
        }

Finally - The $1000 cell phone

C#, Assembiles and JITing

• exe. A console executable. The application must contain one entry point defined in the Main method. There is also a tool called the MSIL Disassembler ( Ildasm.exe ) which is a counterpart of the MSIL Assembler (Ilasm.exe) which takes the portable executable (PE) file that contains Microsoft intermediate language (MSIL) code and creates a text file suitable as input to Ilasm.exe. - talk about round trip decompilation?
• Library. A library (DLL) that can be used by other assemblies.
• Module. A nonexecutable collection of compiled code for use in other assemblies.
• winexe. A graphical Windows executable. The assembly must contain one entry point.

Another concept similar to Java is that of shared asseblys (just like Jars are shared in an app server) . But .NET does not have the concept of class loaders or class paths so the CLR looks in only once place - the Global Assembly Cache (GAC) which is really a directory (usually %Systemroot%\assembly or %Systemroot%\assembly) where the CLR can locate such shared assemblies. There is a tool called the GAC tool (gacutil.exe) to install shared assemblies in the GAC. To share an assembly requires it to have globally unique name (aka a strong name) which consists of the name, version information, culture information, and a public key for cryptography. To create a public key, the .NET Framework provides a strong name tool called sn.exe, which creates a key file that can be referenced in the AssemblyInfo.cs. For my example I used sn–k WSTest.snk and created an Assembly.cs that contained something like

using System.Reflection;
using System.Runtime.CompilerServices;

[assembly: AssemblyTitle("WSTest")]
[assembly: AssemblyDescription("WSTest app ")]
[assembly: AssemblyCompany("Sun Microsystems")]
[assembly: AssemblyProduct("WSTest")]
[assembly: AssemblyCopyright("This is the property of Sun Microsystems ")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyKeyFile("WSTest.snk")]

Now to create the WSTest.dll with with a strong name: csc /target:library /out:WSTest.dll WStest.cs AssemblyInfo.cs and then stored it in the GAC using gacutil /i WSTest.dll
Boom ! We have a shared assembly. So whats the idea - well the plan was to JIT it up and see what happenes with performance.
Theres a bunch of detail on the MSDN website about how runtime objects are created and another link on pros/cons of JIT'ing Essentially when a reference to an object is first encountered, the JITer loads a stub for each method that matches that method's declaration.When the same method is later invoked, the IL for it is compiled and the stub is replaced with the address of the method's compiled code. This happens each time a method is invoked for the first time, and the resulting native code is cached so that it can be reused the next time the assembly is loaded during that session. The JIT compiled code is not actually stored on disk and reused for subsequent executions of the same application. This actually can be done if needed with what Microsoft calls the Native Image Generator - Ngen.exe that a pre-compiles (pre-JIT) IL application code into native machine language code after installation. . A quick peek inside teh C:\WINNT\assembly folder shows that not all shared assemblys are in fact JIT compiled to native code. (see x86 and MSIL as proc arch) . The reason is apparently that JIT performs lots of on-the-fly optimizations when compiling MSIL. Many of these optimizations, particularly those involving the use of registers and memory, are driven by the current demands made on the system. Compiling assemblies in one large batch prevents these optimizations from being made and therefore may actually result in slower final code for the server side execution.

Hmm....Did'nt we do this five or more years back with the JDK 1.1.x HotSpot VM ? Posted by sameert ( Mar 22 2006, 11:00:00 AM EST ) Permalink Comments [0]

American Vertigo

Who's dime is it anyway ?

Finally - a pratical use for the junk that is Roomba

Goonda music

A billion equals 100 Crores

Fennel after meals

Fix You - X&Y;

Are you documented - JWSDP 2.0 on Glassfish - Arrgh !

Remember what you searched for in June 2005 ?

The eye in the sky

EsUVee ?

HP's Niagara bashing site

If you think your office space sucks....

If you think your cube is dark,damp and claustrophobic, think of what it must be like to work out of a bunker. This is taking the "buried in work" phrase quite literally. Symantec's UK facility is buit in a decommissioned cold war nuclear bunker

Longhorn, India and marketing !

JavaOne & Microsoft

Motivation

Thanks to Adobe, I ve now started questioning why I need to hit the gym anymore !

John Hagel & SOA

CEC Conference

Sys-Cons XMLEdge 2005

More on Interoperability and Document Based Web Services

CT Java users group meeting

XML-2004

Video of session

Java Conference in Boston

Interview with Sameer Tyagi

Presentation at Application Development Users Group

Java BluePrints for Service Oriented Architecture

Patterns and Strategies for Building Document-Based Web Services

Upcoming speaking schedule

JavaOne is next week