JavaEmbedUtils should have methods to set/reset Standard I/O
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Key: JRUBY-3662
URL: http://jira.codehaus.org/browse/JRUBY-3662
Project: JRuby
Issue Type: New Feature
Components: Embedding
Affects Versions: JRuby 1.3
Reporter: Yoko Harada
Attachments: ReassignStandardIO.patch
Current implementation does not have any short-cut method to change
$stdin(STDIN), $stdout(STDOUT, $defout, $>), and $stderr(STDERR, $deferr).
Thus, an embed program need to use JRuby's internal API to support the feature,
which enables to change the assigned streams of standard I/O. One example is in
org.jruby.demo.TextAreaReadline. However, it is not a good idea to use internal
API directly.
Changing assigned streams of standard I/O is necessary when implementing JSR
223 Scripting API, and is also a good feature for web application and debugging
for embedders For example, we can set a stream, returned from
HttpServletResponse.getWriter(), to $stdout. Then output of "puts 'Hello'" will
be sent back to a browser. If we set StringWriter to $stdout, the output of
"puts 'Hello'" will be written to StringWriter. So, assertEquals("Hello",
stringWriter.toString()); works. For these reasons, JavaEmbedUtils should have
methods to reassign standard I/O.
Since embed API converts Reader/Writer to Input/OutputStream, methods'
arguments in JavaEmbedUtils can have Input/OutputStream types. This is
suitable to methods in JavaEmbedUtils.
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