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run_ruby_in_process is broken #2754

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jjb opened this issue Mar 24, 2015 · 4 comments
Closed

run_ruby_in_process is broken #2754

jjb opened this issue Mar 24, 2015 · 4 comments
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embed java integration JRuby 1.7.x JRuby 9000
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Invalid or Duplicate

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@jjb
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jjb commented Mar 24, 2015

To observe:

# shell-out-test.rb
JRuby.runtime.instance_config.run_ruby_in_process = true

puts "starting script and sleeping for 5 seconds"
sleep 10
puts "shelling out for 10 seconds"
`ruby -e 'sleep 10'`
puts "done shelling out, sleeping another 5 seconds"
sleep 5

In one terminal run watch 'ps aux |grep [j]ava'

In another, run ruby shell-out-test

Observe that two instances of Java processes are created.

I /think/ this means the feature isn't working? Or maybe even when reusing the JVM there is some sort of OS-level presence for ruby invocation?

➔ java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
➔ jruby --version
jruby 1.7.19 (1.9.3p551) 2015-01-29 20786bd on Java HotSpot(TM) 64-Bit Server VM 1.7.0_45-b18 +jit [darwin-x86_64]
@jjb jjb changed the title reusing JVM instance when shelling out is broken run_ruby_in_process is broken Mar 24, 2015
@headius
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headius commented Apr 2, 2015

I think you're probably right and it's not working. We have not had this mode enabled for a long time, and most users did not want to re-enable it.

What are you hoping to use it for? We disabled it because there were many problems with the pseudo-children.

@jjb
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jjb commented Apr 3, 2015

I have a collection of maintenance scripts I want to run nightly, and I want to invoke them from a master script.

I was going to reimplement this system using background workers eventually anyway, so consider this a vote to officially stop supporting this feature :)

@jjb jjb closed this as completed Apr 3, 2015
@headius
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headius commented Apr 3, 2015

FWIW, you can get the same general effect by just scripting JRuby instances from within Ruby, a la:

jruby1 = org.jruby.embed.ScriptingContainer.new
jruby1.eval_script(some_stuff_to_do)

There are examples of embedding JRuby on the wiki, and they're all doable from Ruby code.

@jjb
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jjb commented Apr 3, 2015

Interesting, thanks!

@enebo enebo added this to the Invalid or Duplicate milestone Apr 28, 2015
@cFire cFire mentioned this issue Mar 8, 2017
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@jjb @headius @enebo