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From Ruwan Linton <ruwan.lin...@gmail.com>
Subject Re: Concurrent Access to Dynamic Resources
Date Thu, 10 Sep 2009 05:06:13 GMT
Hi George,

The issue is not about, the localEntries variable, but the
SynapseConfiguration#getSequence and getEndpoint, the problem in hand cannot
be fixed by making the localEntries variable type into a HashTable.

Thanks,
Ruwan

On Thu, Sep 10, 2009 at 9:18 AM, George Sanchez <george.sanchez@gmail.com>wrote:

> Hi Hiranya,
>      If you will change the localEntries variable from HashMap to a
> Hashtable for storing endpoints and sequences everything will be ok because
> Hashtables are synchronized. You don't have to synchronize the methods.
>      i don't think that it there will be anything really significant
> performance impact if you use a Hashtable.
>
> Regards,
> George Sanchez
>
> On Wed, Sep 9, 2009 at 7:48 AM, Hiranya Jayathilaka <hiranya911@gmail.com>wrote:
>
>> Hi Devs,
>> The Axis2MessageContext class uses SynapseConfiguration#getEndpoint and
>> SynapseConfiguration#getSequence methods to gain access to dynamic endpoints
>> and sequences when they are not present in the message context's local
>> store. However these method calls are not synchronized and from the looks of
>> it I feel that if two message contexts try to access the same dynamic
>> resource at the same time there is a chance that SynapseConfiguration would
>> perform two remote registry lookups to fetch the same resource. This won't
>> really cause any erroneous behavior but if the ESB is under a huge load
>> where each message is trying to load a particular dynamic resource things
>> may get out of hands.
>>
>> So does it make sense to bring in some synchronization into the picture?
>> Or have I missed something and the above theory is not applicable?
>>
>> Thanks
>> --
>> Hiranya Jayathilaka
>> Software Engineer;
>> WSO2 Inc.;  http://wso2.org
>> E-mail: hiranya@wso2.com;  Mobile: +94 77 633 3491
>> Blog: http://techfeast-hiranya.blogspot.com
>>
>
>
>
> --
> George Sanchez
>
>


-- 
Ruwan Linton
Technical Lead & Product Manager; WSO2 ESB; http://wso2.org/esb
WSO2 Inc.; http://wso2.org
email: ruwan@wso2.com; cell: +94 77 341 3097
blog: http://ruwansblog.blogspot.com

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