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From Doug Erickson <erick...@part.net>
Subject Re: synchronization problem
Date Sun, 10 Apr 2016 05:32:57 GMT
The code you've shown won't allow simultaneous executions of the DAO method. Either you've
left some important details out of the sample, or you have other code accessing the DAO. 

This has nothing to do with Struts. The synchronization is implemented in lower layers.

> On Apr 9, 2016, at 8:11 PM, Yaragalla Muralidhar <yaragallamurali@gmail.com> wrote:
> 
> hi,
>  if you look at my code in the service class i have written a synchronized
> block. what i am asking is, whether my code does the synchronization
> properly or does it have to be changed?
> 
> I know that struts2 creates a new action class per thread. so there is
> every possibility that two threads can execute the same service layer
> method at a time. I want to avoid that so i have written synchronized block
> in my service class as shown in my first post.
> 
> *Thanks and Regards,*
> Muralidhar Yaragalla.
> 
> *http://yaragalla.blogspot.in/ <http://yaragalla.blogspot.in/>*
> 
> On Sat, Apr 9, 2016 at 11:18 PM, Sreekanth S. Nair <
> sreekanth.nair@egovernments.org> wrote:
> 
>> Struts2 won't make your custom class threadsafe unless your code is
>> threadsafe, synchronized(this) or synchronized method can be used in your
>> service implementation if you think your service class is not threadsafe.
>> Usually Service or DAO layer should be written threadsafe, don't know about
>> your DAO or Service is threadsafe to make a clear comment on it. Action
>> classes are thread safe since it creates new instance per request.
>> 
>> 
>> --------------------
>> 
>> On Sat, Apr 9, 2016 at 10:06 PM, Yaragalla Muralidhar <
>> yaragallamurali@gmail.com> wrote:
>> 
>>> Hi,
>>> 
>>>     I have developed a web application using struts 2. In my struts 2
>>> action class i am calling the service layer and written the
>> synchronization
>>> code as below in the service layer. Does this really gets synchronized?
>> Is
>>> there any problem in my synchronization code?
>>> 
>>> 
>>> 
>>> *The following is my action class:-*
>>> 
>>> 
>>> 
>>> public class AbcAction extends ActionSupport{
>>> 
>>>     private AbcService ser=new AbcServiceImpl(); //AbcService is an
>>> Interface
>>> 
>>> 
>>> 
>>>     public String execute(){
>>> 
>>>     ser.createNewRegistration();
>>> 
>>>     return "SUCCESS";
>>> 
>>>     }
>>> 
>>> 
>>> 
>>> }
>>> 
>>> 
>>> 
>>> *The following is my service Impl class:-*
>>> 
>>> 
>>> 
>>> public class AbcServiceImpl implements AbcService{
>>> 
>>> private AbcDao dao=new AbcDaoImpl();
>>> 
>>> 
>>> 
>>> public void  .createNewRegistration(){
>>> 
>>> synchronized(AbcServiceImpl.class){
>>> 
>>> dao.createTheRegistration();
>>> 
>>> }
>>> 
>>> }
>>> 
>>> }
>>> 
>>> 
>>> 
>>> by writing the above code i assume that no two threads can run the
>>> "dao.createTheRegistration()"
>>> method at the same time. but when we analyze the logs i observed this is
>>> not happening. Two threads are able to execute the method at the same
>> time.
>>> What is the problem in my code?
>>> 
>>> 
>>> 
>>> *Thanks and Regards,*
>>> Muralidhar Yaragalla.
>>> 
>>> *http://yaragalla.blogspot.in/ <http://yaragalla.blogspot.in/>*
>> 

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