Class: Arrow::DispatcherLoader

Inherits:
Object
  • Object
show all
Defined in:
lib/arrow/dispatcherloader.rb

Overview

A RubyChildInitHandler class which loads one or more dispatchers when a child server starts. This can eliminate the startup lag for the first request each child handles. See the docs for dispatcher.rb for an example of how to use this.

Instance Method Summary

Constructor Details

- (DispatcherLoader) initialize(hostsfile)

Create a loader that will create dispatchers from the given hostsfile, which is a YAML hash that maps dispatcher names to a configfile path. 



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# File 'lib/arrow/dispatcherloader.rb', line 16

def initialize( hostsfile )
  require 'arrow/applet'
  require 'arrow/dispatcher'
  require 'arrow/broker'

  @hostsfile = hostsfile
end

Instance Method Details

- (Object) child_init(req)

Load the dispatchers according to the registered hosts file. 



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# File 'lib/arrow/dispatcherloader.rb', line 26

def child_init( req )
  req.server.log_info( "Loading dispatcher configs from " + @hostsfile + "." )
  Arrow::Dispatcher.create_from_hosts_file( @hostsfile )

  return Apache::OK
rescue ::Exception => err
  errmsg = "%s failed to load dispatchers (%s): %s: %s" % [
    self.class.name,
    err.class.name,
    err.message,
    err.backtrace.join("\n  ")
  ]

  logfile = Pathname.new( Dir.tmpdir ) + 'arrow-dispatcher-failure.log'
  logfile.open( IO::WRONLY|IO::TRUNC|IO::CREAT ) do |ofh|
    ofh.puts( errmsg )
    ofh.flush
  end

  Apache.request.server.log_crit( errmsg )
  raise
end