java - how to define cycles in protobuf? -


say have following mode.proto file:

message entityd {     optional entitye epointer = 1;     optional int32 dfield = 2; }  message entitye {     optional entityd dpointer = 1;     optional int32 efield = 2; }

this has 2 entities - d , e, allow cross-linking. issue after generating java code above *.proto im unable create cycle:

public static void main(string[] args) throws exception {     model.entityd.builder dbuilder = model.entityd.newbuilder();     model.entitye.builder ebuilder = model.entitye.newbuilder();      dbuilder.setdfield(42);     ebuilder.setefield(7);     dbuilder.setepointer(ebuilder);     ebuilder.setdpointer(dbuilder);      model.entityd d = dbuilder.build();     model.entitye e = ebuilder.build();      system.err.println("same d: "+(d==e.getdpointer()));     system.err.println("same e: "+(e==d.getepointer())); }

im trying create simple d <--> e cycle. instead this:

same d: false  same e: false

enter image description here

there is cycle in created model, starting depth.

is issue probuf-generated java code? protobuf officially support cycles in graph ? whats expected result in other protobuf "output" languages? (namely c++)

the protobuf format not include object identity, , there no notion of reference / graph support. basic tree only. beyond implementation specific , not part of specification.

basically, don't that.

this not uncommon: same true of many serializers, including xml , json serializers. , these cases, again, implementations may have support local definition of identity - not guaranteed in general case.


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more