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December 23, 2011  Tagged with: , , , ,

# scrooge

Scrooge is a thrift code generator for scala.

It’s meant to be a drop-in replacement for the apache thrift code generator.

Since scala is API-compatible with java, you can use the apache thrift code generator to generate java files and use them from within scala, but the overhead of converting to/from java containers can sometimes be annoying. This is an attempt to bypass the problem by generating scala code directly. It also uses scala syntax so the generated code is much smaller.

The generated code still depends on libthrift.

There is a fairly comprehensive set of unit tests, which actually generate code, compile it, and execute it to verify expectations.

## Building

To build scrooge, use sbt:

$sbt package-dist  ## Features • Generates native scala thrift codecs, using case classes and functions. • Generated code is templated using a mustache variant, making it easy to edit. • Finagle client/server adaptors, and Ostrich wrappers, can be optionally generated at the same time. ## Running Scrooge A starter script is built into dist/scrooge/scripts. You can run that or write your own. To get command line help: $ scrooge --help 

To generate source with content written to the current directory:

$scrooge <thrift-file1> [<thrift-file2> ...]  To generate source with content written to a specified directory, using extra include paths, rebuilding only those files that have changed: $ scrooge -d <target-dir> -i <include-path> -s <thrift-file1> [<thrift-file2> ...] 

## Runtime dependency

There are a couple of classes needed by the generated code. These have been moved out of scrooge into a separate jar to keep dependencies small:

val scrooge_runtime = "com.twitter" % "scrooge-runtime" % "1.0.3" 

## SBT Plugin

There’s a plugin for SBT (0.7.x) which is meant to be a drop-in replacement for sbt-thrift:

To use it, replace the “sbt-thrift” line in your Plugins.scala file with:
val sbtScrooge = "com.twitter" % "sbt-scrooge" % "1.1.1" 
(or whatever the current version is) and add with CompileThriftScroogeMixin or with CompileThriftScrooge to your project’s mixin list. More details are in the sbt-scrooge README.
Scrooge is licensed under the Apache 2 license, which you can find in the included file LICENSE.