Hi, I have added a page in the 2.2.0 docs [1]. Please have a look and let me know if there are any changes required.
[1] https://docs.wso2.org/display/MB220/Using+Message+Selectors Thanks, Tania On Thu, Mar 27, 2014 at 9:23 PM, Ishara Premadasa <ish...@wso2.com> wrote: > Hi all, > > I have committed the initial implementation in revision r199114 where it > does provide selector support for Queues and Durable Topics. When looking > at the source i could find that we were already having message selectors > for Topics and there was no need to re-implement it. > > Since there are a whole list of different patterns that can be used in > selector strings we need to test them extensively against both > topics/queues and identify which literals,logics etc. are supported by > selectors and which are not. As the first phase we are going to test > against the selectors in [1] as well as testing against all the JMS headers > and properties. > > As per the JMS Headers the following headers are supported with selectors, > where a client can set and send to broker. > > *JMSCorrelationID JMSReplyTo JMSType * > > The below header properties will not be filtered by broker since they are > handled by the JMS provider and set into the default values at broker side > as describer here. [2] > > *JMSPriority JMSExpiration JMSDeliveryMode* > > Once these are tested we can update the MB 2.2.0 docs with supported > syntaxes and headers for Message Selectors. > > Thanks! > Ishara > > [1] > http://www.novell.com/documentation/extend5/Docs/help/Composer/books/JMSAppendixB.html > [2] http://docs.oracle.com/cd/E19798-01/821-1841/bnces/index.html > > > > On Thu, Mar 27, 2014 at 10:34 AM, Pamod Sylvester <pa...@wso2.com> wrote: > >> +1 to handle it from the server side, also considering the fact of >> sending irrelevant messages to client will be an additional network >> overhead. >> >> >> On Thu, Mar 27, 2014 at 10:18 AM, Ishara Premadasa <ish...@wso2.com>wrote: >> >>> Hi all, >>> >>> We are going to implement message selectors support [1] into WSO2 >>> Message Broker where a message consumer is allowed to specify the messages >>> it is interested by using a selector string and the broker (JMS provider) >>> does the filtering of messages according to that query. The syntax of the >>> JMS selector expression is based on a subset of SQL92, mentioned here [2]. >>> >>> Message selectors can be implemented either using the client-side or >>> server-side. As the first try i have tried with filtering the messages in >>> the client-side where the filtering happens after the message is dispatched >>> into client side. >>> >>> However we had some considerable issues with this method since the >>> messages which were rejected by the consumer's selector cannot be >>> re-delivered to other consumers who do not have filters, and those messages >>> were stuck in queue. Therefore since this was not possible to be handled in >>> the client-side we moved the implementation server-side. >>> >>> Therefore with the current implementation at server side when the >>> messages are sending out to subscribers we check whether the message >>> matches the filters and if so that will be given out to the subscriber. If >>> not that message will be removed from already read messages, hence it can >>> be given to another matching subscriber in the next round. >>> >>> I will be updating this thread with the progress of the implementation. >>> The plan is to send this out with 2.2.0 version, however if takes more time >>> this will be definitely available with MB 3.0.0 version. Any >>> feedback/suggestions are welcome. >>> >>> Thanks! >>> Ishara >>> >>> [1] http://docs.oracle.com/cd/E19798-01/821-1841/bncer/index.html >>> [2] >>> http://www.novell.com/documentation/extend5/Docs/help/Composer/books/JMSAppendixB.html >>> >>> >>> -- >>> Ishara Premasada >>> Software Engineer, >>> WSO2 Inc. http://wso2.com/ >>> >>> >>> *Blog : http://isharapremadasa.blogspot.com/ >>> <http://isharapremadasa.blogspot.com/>Twitter : >>> https://twitter.com/ishadil <https://twitter.com/ishadil> Mobile : >>> +94 714445832 <%2B94%20714445832>* >>> >>> >>> >> >> >> -- >> *Pamod Sylvester * >> * Software Engineer * >> Integration Technologies Team, WSO2 Inc.; http://wso2.com >> email: pa...@wso2.com cell: +94 77 7779495 >> > > > > -- > Ishara Premasada > Software Engineer, > WSO2 Inc. http://wso2.com/ > > > *Blog : http://isharapremadasa.blogspot.com/ > <http://isharapremadasa.blogspot.com/>Twitter : > https://twitter.com/ishadil <https://twitter.com/ishadil> Mobile : > +94 714445832 <%2B94%20714445832>* > > > > _______________________________________________ > Dev mailing list > Dev@wso2.org > http://wso2.org/cgi-bin/mailman/listinfo/dev > > -- Tania Mahanama Senior Technical Writer Contact: Mob: +94 077 5129270
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