Class: Closure::BeanShell

Inherits:
Object
  • Object
show all
Defined in:
lib/closure/beanshell.rb

Overview

Closure Script will manage a single BeanShell to run the Java tools. This way we don’t pay the Java startup costs on every compile job.

Constant Summary

PROMPT = 
/^bsh % $\Z/
JAR = 
File.join(Closure.base_path, 'beanshell', 'bsh-core-2.0b4.jar')

Instance Method Summary (collapse)

Constructor Details

- (BeanShell) initialize(classpath = [])

A new instance of BeanShell

Parameters:

  • classpath (Array) (defaults to: []) — 



26
27
28
29
30
 
# File 'lib/closure/beanshell.rb', line 26

def initialize(classpath=[])
  @semaphore = Mutex.new
  @classpath = classpath
  $cmdin = nil
end

Instance Method Details

- run(command)

Run any Java command that BeanShell supports. Recovers from error conditions when the Java process is killed. 



34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/closure/beanshell.rb', line 34

def run(command)
  begin
    return execute command
  rescue Errno::EPIPE
    # Shut down broken pipe; another will be started.
    $stderr.print "#{self.class}: restarting Java.\n"
    $pipe.close
    $pipe = nil
  end
  # This "second chance" will not rescue the error.
  execute command
end