On Fri, Apr 1, 2016 at 6:06 AM, Ranadheer Pulluru <pranadh...@gmail.com> wrote:
> Hi, > > I'm planning to use protobuf for publishing tick data of the financial > instruments. The consumers can be any of the java/python/node.js > languages.The tick is expected to contain various fields like (symbol, > ask_price, bid_price, trade_price, trade_time, trade_size, etc). Basically, > it is sort of a map from field name to the value, where value type can be > any of the primitive types. I thought I can define the schema of the Tick > data structure, using map > <https://developers.google.com/protocol-buffers/docs/proto3#maps>and Any > <https://developers.google.com/protocol-buffers/docs/proto3#any>as follows > > > syntax = "proto3"; > > package tutorial; > > import "google/protobuf/any.proto"; > > message Tick { > string subject = 1; // name of the financial instrument - something > like MSFT, GOOG, etc > uint64 timestamp = 2; //millis from epoch signifying the timestamp at > which the object is constructed at the publisher side. > map<string, google.protobuf.Any> fvmap = 3; // the actual map having > field name and values. Something like {ask_price: 10.5, bid_price: 9.5, > trade_price: 10, trade_size=5} > } > > Though I'm able to generate the code in different languages for this > schema, I'm not sure how to populate the values in the *fvmap*. > > public class TickTest > { > public static void main(String[] args) > { > Tick.Builder tick = Tick.newBuilder(); > tick.setSubject("ucas"); > tick.setTimestamp(System.currentTimeMillis()); > Map<String, Any> fvMap = tick.getMutableFvmap(); > // fvMap.put("ask", value); // Not sure how to pass values like > 10.5/9.5/10/5 to Any object here. > } > } > > > > Could you please let me know how to populate the fvMap with different > fields and values here? Please feel tree to tell me if using map > <https://developers.google.com/protocol-buffers/docs/proto3#maps>and Any > <https://developers.google.com/protocol-buffers/docs/proto3#any>is not > the right choice and if there are any better alternatives. > It seems to me a google.protobuf.Struct suites your purpose better: https://github.com/google/protobuf/blob/master/src/google/protobuf/struct.proto#L51 > > Thanks > Ranadheer > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to protobuf+unsubscr...@googlegroups.com. > To post to this group, send email to protobuf@googlegroups.com. > Visit this group at https://groups.google.com/group/protobuf. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+unsubscr...@googlegroups.com. To post to this group, send email to protobuf@googlegroups.com. Visit this group at https://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
