[GraphHopper] Reg: GhRequest and handling new params

[Peter]

Hi Mani,

this should be easy if you use the HTTP communication ('pseudo REST'):
 1. start the server, which makes the web api
<https://github.com/graphhopper/graphhopper/blob/master/docs/web/api-doc.md>
available on localhost:8989
 2. in node.js you can then e.g. (re)use the separate client in
javascript from here
<https://github.com/graphhopper/directions-api-js-client> but have not
tested it in node.js only within the browser

Regards,
Peter

PS: please when replying the mailinglist emails make sure your answers
go to graphhopper at openstreetmap.org instead of the personal email

On 09.07.2015 01:37, Manikanta Kondeti wrote:
> Hi Peter, 
>
> Thanks a lot for the reply. I am writing a small application where the
> backend is in Node js. I want to create a bridge communication between
> routing engine (graphhopper which is in java) and server code(node
> js). I've found a node lib node-java-maven which helps to create tht
> communication but I am not sure how. Is it possible? If yes how do I
> start. I am basically new to Java and trying to figure out Java
> frameworks. Summary is I am trying to create client, server in node-js
> and basically want to pass the params to server, server-
> java(graphhopper), calculate route and send it back. I want to
> understand that communication between java and node. What are your
> thoughts on it? Your advice will help me a lot.  
>
> Thanks, 
> Mani   
>
> On Wed, Jul 8, 2015 at 12:48 PM, Peter <graphhopper at gmx.de
> <mailto:graphhopper at gmx.de>> wrote:
>
>     Hi Mani,
>
>     thanks for the introduction. How to create a custom weighting is
>     described here
>     <https://github.com/graphhopper/graphhopper/blob/master/docs/core/weighting.md>
>     - i.e. extend from the FastestWeighting and return it in
>     YourCustomGraphHopper.createWeighting. To pass parameters to it
>     you put them in the hints either via Java:
>     request.getHints().put("hi", "mani");
>     or via URL parameters:
>     &hi=mani
>
>     You can then read such custom parameters out in the constructor of
>     your Weighting as the whole hints map is passed to it at creation
>     time
>     <https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/GraphHopper.java#L852>.
>     E.g. like here
>     <https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/FastestWeighting.java#L45>.
>
>     Regards,
>     Peter
>
>
>     On 07.07.2015 21:03, Manikanta Kondeti wrote:
>>     Hi, 
>>
>>        This is Manikanta. I've been an avid user/developer in
>>     pgrouting. After seeing the fastness in graphhopper, I'm pretty
>>     much interested in understanding it as a user and developer. Also
>>     I am basically new to Java, hoping its not a problem to learn it
>>     as it looks a lot like c++. I've read all the docs and I can
>>     clearly understand the inner underlying techniques which makes it
>>     faster. I love the way you guys building the graph and also
>>     contraction hierarchies stuff though its not useful for dynamic
>>     graph. 
>>
>>         Now I want to tweak the code and basically write a new custom
>>     weighting class. So the first step in doing it is to tweak the
>>     GhRequest and extend a new class from it or use the same class
>>     with additional methods and member variables. Can you give me an
>>     overview of how to proceed? My plan is to take a few(10) params
>>     and pass it to the custom weighting. Is it possible?  Giving me a
>>     reference link would help me a lot. Sorry if this is very basic
>>     question. Hope you understand. 
>>
>>     Thank you,
>>     Mani 
>>         
>>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/graphhopper/attachments/20150709/9e4d316c/attachment.html>