I am +1 for the second option of retrieving the image as a binary stream. Given the fact that images can be of varying sizes (talking about high-resolution ones, here), and Sidhdhi not having any image processing capabilities as of this moment, I do not see a clear advantage in using a SIdhdhi stream for storage and retrieval.
Thanks and Regards, Ruwan Yatawara Technical Lead, WSO2 Inc. email : ruw...@wso2.com mobile : +94 77 9110413 http://ruwansrants.blogspot.com/ https://500px.com/ruwan_ace https://medium.com/@ruwanyatawara On Tue, Jan 16, 2018 at 10:52 AM, Nuwan Jayawardene <nuw...@wso2.com> wrote: > Hi all, > > I'm currently working on a project to add image storing and retrieval > capabilities to the WSO2 IoT Server. > > To achieve this I have implemented the following; > 1) Added a separate DAO Table with a field with LONGBLOB data type for > storing. > 2) Added storage capabilities in the database for an image sent as a *File > *in the form of a *BinaryStream*. > > As of now, I've written unit tests and the test images are getting stored > successfully in the database. > > The problem lies in how to successfully retrieve the stored data. For > this, I have come across 2 possible approaches. > 1) *Retrieve as a File - *The notable downside I realized with this > solution is that each time a new Image is retrieved, a new file will be > created. Therefore measures would have to be taken to persist new files > while purging older obsolete ones. > 2) *Retrieve as BinaryStream - *Although this requires no persistent > memory usage and the data will only be retrieved on call and issues may > come up when representing that data from a UI end. Further analysis is > required for this approach. > 3) *Retrieve as FileOutputStream - *This is my preferred method and the > one recommended mostly in forums and tutorials. > > One other approach suggested to me was to use a *Siddhi Stream for both > storage and retrieval* purposes. This would further allow for analytics > to be performed on the data which not be very much possible with the > earlier mentioned approaches. > > Suggestions and Feedback are appreciated. > Thanks and regards! > > -- > *Nuwan Jayawardene* > *Software Engineering Intern* > *WSO2, Inc.:http://wso2.com <http://wso2.com/>* > *lean.enterprise.middleware* > *Mobile :- +94 71 1813299 <+94%2071%20181%203299>* > > > - *Linkedin* *:- **https://www.linkedin.com/in/nuwa > <https://www.linkedin.com/in/nuwanjaya/>**njaya/ > <https://www.linkedin.com/in/nuwanjaya/>* > - * <https://www.wso2.com/signature>* > >
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