dao - Neo4j project structure -

-

i looking build relatively complex neo4j application, intend split in 2 separete projects, namely frontend , backend. frontend html5 , not relevant question, backend have rest interface jersey, it's structure behind rest interface have questions about.

atm, how envisioned :

restimpl <-data-> service  <-dto-> repository <-node-> dao <--> neo4j singleton

the general flow restimpl receives json , converts simple java objects strings, int, ... passed on service creates dto them. dto passed on repository performs dao calls needed write such dto database (one dto may require several nodes , relations created). dao thinking of creating both core api , cypher implementation, has basic graph functions creating node, creating relation, deleting node, ... methods useful repositories basically. neo4j singleton contain graphdatabaseservice instance , configuration stuff.

this relatively complex structure want project modular. makes easy dependency injection. (everything written against interface well)

however, examples on internet have different implementation. make dto's wrapper around neo4j node or @ least store underlying node in dto. allow rest-service-dao structure.

but doesn't allow me change repository implementations , put different database behind application.

what "most correct way" want do?

i use you've described above , find works well(one project in production, 1 there) , not mix concerns. don't use spring data option consider.

i have defined domain objects standard pojo's- no neo4j stuff in them @ all. persistence managed dao's- contain cypher queries, , in cases core api work depending on complexity.

the graphdatabase injected (i have 2 contexts- embeddedgraph implementation injected production , impermanentgraph tests). rest service exposed using jersey deals domain objects and/or dto's. neo4j code seen in persistence layer. got couple of general convenience methods exposed index/fetch index etc.

i wouldn't go wrap-node way- tried found brings along own set of problems , results in smelly design. looks you're on right track (to me @ least)


Popular posts from this blog

How to calculate SNR of signals in MATLAB? -

-
i've encountered simple, yet fundamental problem on calculating snr: there several signals : s1 = original , pure clean signal without noise. n1 = white gaussian noise going added s1. s2 = s1 + n1 (the noisy signal before performing noise-reduction algorithm) s3 = noise-reduced signal (after performing noise reduction algorithm) n2 = s3 - s1 (the amount of noise after performing noise-reduction algorithm) now want compare snr before , after performing noise-reduction algorithm. which signals should consider snr_before!? s1/n1 or s2/n1 ? which signals should consider snr_after!? s3/n1 or s3/n2 ? which commands or functions should use in matlab in order compute snr_before , snr_after? thanks billion putting time on helping me. what know calculating snr before : snrbeforenoise = mean( signal .^ 2 ) / mean( noise .^ 2 ); and snr after : residual_noise = signal - noise_reduced_signal; snr_after = mean( signal .^ 2 ) / mean( residual_noise .^ 2
Read more

c# - Attempting to upload to FTP: System.Net.WebException: System error -

-
i have api takes in xml , uploads files based on information in xml. uploads on schedule (also xml), , have tested surrounding , know works. i getting error 40% of time on first file attempt upload in each time cycle (time cycle = 45 minutes files, 30 minutes others). here code upload: try { loggerftp.log("uploading file: " + filename, false); // create request. ftpwebrequest request = (ftpwebrequest)webrequest.create(appsettingsftp.ftpurl + @"/" + filename); request.method = webrequestmethods.ftp.uploadfile; request.timeout = 6000000; //set 100 minutes //request.timeout = -1; //set infinite // add login credentials. request.credentials = new networkcredential(appsettingsftp.ftplogin, appsettingsftp.ftppassword); // grab file contents. streamreader sourcestream = new streamreader(appsettingsftp.uploadfiledirectory + filename); byte[] filecontents = encoding.utf8.getbytes(sourcestream.readtoend()); sourcest
Read more

ios - UISlider customization: how to properly add shadow to custom knob image -

-
Image
i need place custom knob image shadow uislider. far have image of 38x38, of there region defines shadow of knob. now while using image, when slide knob extreme ends actual knob not able cover end points, hence end points visible under transparent region of knob image this code using customize uislider uiimage *slidebtimg = [uiimage imagenamed:sliderknobimg]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatenormal]; [self.ratingslider setthumbimage:slidebtimg forstate:uicontrolstatehighlighted]; how can implement custom knob shadow beneath it, covering end points?? look inside uislider.h , there methods let customize slider knob , track needed. (ios 2.0 , above) // lets subclass lay out track , thumb needed - (cgrect)minimumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)maximumvalueimagerectforbounds:(cgrect)bounds; - (cgrect)trackrectforbounds:(cgrect)bounds; - (cgrect)thumbrectforbounds:(cgrect)bounds trackrect:(cgrect)rect value:
Read more