t.join();

 Interupts

use Thread.interrupted() to check if interrupt has been issues

When a thread checks for an interrupt by invoking the static method Thread.interrupted, interrupt status is cleared. The non-static isInterrupted method, which is used by one thread to query the interrupt status of another, does not change the interrupt status flag.

Producer/ consumer pattern

Use blocking queue which provide blocking put and take methods

Work stealing pattern 

when  the worker exhausts works from its own queue it can steal work from another works queue


Blocking QUEUE interface

methods are summarized in the following table:

Throws exception Special value Blocks Times out Insert add(e) offer(e) put(e) offer(e, time, unit) Remove remove() poll() take() poll(time, unit) Examine element() peek() not applicable not applicable

LOCKS

public class Reentrant{

  public synchronized outer(){
    inner();
  }

  public synchronized inner(){
    //do something
  }
}

If a thread already holds the lock on a monitor object, it has access to all blocks synchronized on the same monitor object. This is called reentrance. 

details at IBM Blog




  Volatile keyword in Java is used as an indicator to Java compiler and  Thread that do not cache value of this variable and always read it from main memory.

Read more: http://javarevisited.blogspot.com/2011/06/volatile-keyword-java-example-tutorial.html#ixzz2K1tl1ebX

IBM blog http://www.ibm.com/developerworks/library/j-jtp03304/

http://phandroid.com/2010/05/14/hello-1992-windows-3-1-comes-to-android/

I still believe the android strategy is game changer rather than one particular device, that said, one should not forget it has got very fast computer in its gutts.

I can remember when i was in university i was using pentium 500MHz processor, and 1GB Hard drive for engineering assignments and it seemed quite fast. Nexus one phone has 1 Giga Hertz Snapdragon processor and i bet in processing power it will beat my uni computer hand down.

If one has to compare internet applications Google is far ahead of the crowd, apple has got no match for that. Now google is bringing eco system of web based apps (email, calendar, etc) to phone wrapped in android OS and that is a very powerful proposition.Since this is Open source we should expect rapid innovation, here we go, now we have a game changer :)

http://www.viddler.com/explore/engadget/videos/865/

Prototype trials in China, Australia & Singapore from Chariot Skates on Vimeo.

Its bit funny to see people comparing spec by spec and declaring one one winner over the other, but we should not forget that Iphone kicked Nokia by not coming up with just good spec phone but by setting great user experience driven by great ecosystem of services, such as music download, apps and excellent marketing.

One thing that could kill Iphone would be inovation in form of new business model, services etc.

If one is to believe the rumors, google is going to launch Nexus one on Jan 5th 2010 at discounted price of $199

1) Copy log4j jar into domain/lib dir

2)copy WL_HOME/server/lib/wllog4j.jar into domain/lib

Log into weblogic console browse to the server and in logging tab select log4j

Give weblogic a restart