Hi Tishan, On 4 November 2014 09:58, Tishan Dahanayakage <tis...@wso2.com> wrote:
> > > On Tue, Nov 4, 2014 at 9:45 AM, Srinath Perera <srin...@wso2.com> wrote: > >> Big picture is CEP retain events within Windows, Windows with Join, and >> for patterns and sequence matching. When those windows (or data structures) >> are small they work ok, but when they are big they need specific >> optimisations like Indexes (B-Trees), Bloom Filters, Compression, disk >> based etc. >> >> Idea is to hide event storage under common interface so we can write >> generic code that will work with different windows joins etc and let users >> select and optimize. For example, with this, the disk based window will >> work with all types of windows. >> >> Tishan, can we merge peek and removeLat with last(boolean remove)? >> > > OK. > >> >> --Srinath >> >> >> >> On Mon, Nov 3, 2014 at 3:26 PM, Tishan Dahanayakage <tis...@wso2.com> >> wrote: >> >>> Hi all, >>> >>> Following is a draft of the interface of Siddhi window data structure >>> that will be exposed. Rationale behind this is to seamlessly support >>> different implementations such as bloom >>> >>> filters, disk backed window, etc. Please review this and propose >>> necessary modifications. >>> >>> //Initializes the data structure. Configuration parameters such as size, >>> indexing attributes can be passed along with Expression[] >>> public void init(Expression[] expressions); >>> >>> //Adds objects to the data structure >>> public void add(Event event); >>> >>> //Removes and returns last element >>> // >>> public Event removeLast(); >>> >> > //Returns the last element while removal is based on the Boolean input > parameter. Returns null if remove is false. > I think the behaviour of the method should be "Returns null if the window is empty"? A typo?.. :-) > public Event getLast(Boolean remove) > >> >>> //Removes a specific Event if present. Else returns null. >>> public void remove(Event event); >>> >>> Will remove this and merge with removeLast() > >> //Returns the last element without removing >>> >> // >>> public Event peek(); >>> >>> //Finds and returns a event if present in window. else returns null. >>> This method is required for implementations like bloom filter >>> public Event find(String attribute, Object value); >>> >>> //Returns an Iterator to iterate the data structure >>> public Iterator<Event> iterator(); >>> >>> //Returns elements of data structure as an array for persistence purposes >>> public Object[] currentState(); >>> >>> //Re-populate data structure with given set of Objects >>> public void restoreState(Object[] objects); >>> >>> //Returns no of Events reside inside data structure >>> public int size(); >>> >>> //Free up any used resources >>> public void destroy(); >>> >>> Thanks, Lasantha > -- >>> Tishan Dahanayakage >>> Software Engineer >>> WSO2, Inc. >>> Mobile:+94 716481328 >>> >>> Disclaimer: This communication may contain privileged or other >>> confidential information and is intended exclusively for the addressee/s. >>> If you are not the intended recipient/s, or believe that you may have >>> received this communication in error, please reply to the sender indicating >>> that fact and delete the copy you received and in addition, you should not >>> print, copy, re-transmit, disseminate, or otherwise use the information >>> contained in this communication. Internet communications cannot be >>> guaranteed to be timely, secure, error or virus-free. The sender does not >>> accept liability for any errors or omissions. >>> >> >> >> >> -- >> ============================ >> Blog: http://srinathsview.blogspot.com twitter:@srinath_perera >> Site: http://people.apache.org/~hemapani/ >> Photos: http://www.flickr.com/photos/hemapani/ >> Phone: 0772360902 >> > > > > -- > Tishan Dahanayakage > Software Engineer > WSO2, Inc. > Mobile:+94 716481328 > > Disclaimer: This communication may contain privileged or other > confidential information and is intended exclusively for the addressee/s. > If you are not the intended recipient/s, or believe that you may have > received this communication in error, please reply to the sender indicating > that fact and delete the copy you received and in addition, you should not > print, copy, re-transmit, disseminate, or otherwise use the information > contained in this communication. Internet communications cannot be > guaranteed to be timely, secure, error or virus-free. The sender does not > accept liability for any errors or omissions. > > _______________________________________________ > Architecture mailing list > Architecture@wso2.org > https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture > > -- *Lasantha Fernando* Software Engineer - Data Technologies Team WSO2 Inc. http://wso2.com email: lasan...@wso2.com mobile: (+94) 71 5247551
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