Thread Basics - I

Thread: Why to use thread?

• To run task parallel and concurrently

• To utilise the hardware resource efficiently multi core/mullti cpu+ core  processor

Thread name :

-Is mutable

-Multiple thread can share same name.

Volatile: When to use volatile?

shared variable: one thread read/write + multiple thread read .

Will not work for : thread 1 read/write + thread2 read//write 

Synchronization:
thread 1 read/write + thread2 read/write 

Thread Priorities:

• Each java threads open a new native thread at OS level. Setting priorities translates to native priorities based on the OS platform

• Not recommended to rely solely on priorities

Thread Local Storage:

-Exist as long as the thread is alive

public static class PaymentResponseData

{

public int transactionId;

public String transactionStatus;

public int userId;

}

public static final ThreadLocal<PaymentResponseData> globalData =

new ThreadLocal<PaymentResponseData>();

globalData.set(tranacationData) 

 globalData.get().

 myThread.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {

   public void uncaughtException(Thread t, Throwable e) {

   PaymentResponseData paymentResponseData=  globalData.get()

System.err.println("Error occurred with transaction ID " + paymentResponseData.get().transactionId);   }

   });

Demon thread:

Provide service to the user thread. Eg gc

Collecting statistics and performing the status monitoring tasks