Carl Yeksigian created THRIFT-1948: -------------------------------------- Summary: Add a stream type Key: THRIFT-1948 URL: https://issues.apache.org/jira/browse/THRIFT-1948 Project: Thrift Issue Type: New Feature Components: AS3 - Compiler, AS3 - Library, C glib - Compiler, C glib - Library, C# - Compiler, C# - Library, C++ - Compiler, C++ - Library, Cocoa - Compiler, Cocoa - Library, Compiler (General), D - Compiler, D - Library, Delphi - Compiler, Delphi - Library, Erlang - Compiler, Erlang - Library, Go - Compiler, Go - Library, Haskell - Compiler, Haskell - Library, Java - Compiler, Java - Library, JavaME - Compiler, JavaME - Library, JavaScript - Compiler, JavaScript - Library, Node.js - Compiler, Node.js - Library, OCaml - Compiler, OCaml - Library, Perl - Compiler, Perl - Library, PHP - Compiler, PHP - Library, Python - Compiler, Python - Library, Ruby - Compiler, Ruby - Library, Smalltalk - Compiler, Smalltalk - Library Reporter: Carl Yeksigian Assignee: Carl Yeksigian
This is a proposal for an addition to the Thrift IDL, which allows for sending chunks of data between the server and the client without having the whole message in memory at the start of the communication. The new keyword, "stream<T>", would indicate that there is a series of values typed T which would be communicated between client and server. Stream would have three primitives: {code} next(T) error(TException) end() {code} Protocols would be enhanced with the following methods: {code} writeStreamBegin(etype, streamid) writeStreamNext(streamid, streamMessageType) writeStreamNextEnd() writeStreamErrorEnd() etype, streamid = readStreamBegin() streamid, streamMessageType = readStreamNext() readStreamNextEnd() readStreamErrorEnd() {code} streamMessageType is one of the following: # next This means that the message will be of the element type. # error An exception was thrown during materialization of the stream. The stream is now closed. # end This means that the stream is finished. The stream is now closed. Once all streams are closed, readMessageEnd should be called. Before the first writeStreamNext() could be called, the message should otherwise be complete. Otherwise, an exception should be raised. It is possible that an exception will be thrown while the stream is being materialized; however, this can only occur inside of a service. In this case, error() will be called; the exception should be one of the exceptions that the service call would have thrown. The values that were generated before the exception will generally be valid, but may only have meaning if the stream is ended. All streams which are currently open may get the same exception. If the following service was defined: {code} stream<i64> random_numbers(stream<i64> max) {code} A sample session from client to server would be: {code} writeMessageBegin() writeStreamBegin(I64, 0) writeStreamNext(0, next) writeI64(10) writeStreamNextEnd() writeStreamNext(0, end) writeMessageEnd() {code} A sample session from server to client would be: {code} writeMessageBegin() writeStreamBegin(i64, 0) writeStreamNext(0, next) writeI64(3) writeStreamNextEnd() writeStreamNext(0, end) writeMessageEnd() {code} This change would not be compatible with previous versions of Thrift. Also, for languages which do not support this type of streaming, it could be translated into a list. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira