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Denis Knauf 2010-03-02 11:40:06 +01:00
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AUTHOR Normal file
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Denis Knauf <denis dot knauf at gmail dot com>

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LICENSE Normal file
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
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README.md Normal file
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Status
======
Proof of Concept!
Queue:
Ruby-Klasse zur Kommunikation zwischen Threads. Unidirektional
BDB-Queue:
Queue auf Basis einer BDB. Kann zur Kommunikation zwischen Prozessen dienen. Unidirektional.
Stream:
UNIX-Stream. Bidirektional.
Sicherheit
==========
Verarbeitung wird jeweils abgeschottet und darf nicht auf andere Daten zugreifen.
$SAFE = 4 waere wuenschenswert, aber unpraktikabel bezueglich Queue.
$SAFE = 3 reicht.
Mehrere Prozesse also nicht noetig.
erstes Map auf Logdaten
=======================
Liest aus der BDB-Queue, verarbeitet und schreibt in eine andere Datenbank.
Parallelisierung
----------------
Eine DB, die speichert, wer an was arbeitet. Koennte langsam werden.
MapReduce allgemein
===================
Woher kommt die Information, dass gearbeitet werden kann? BDB-Queue/Stream/Queue.
Piping
======
MapReduce-Verarbeitung kann auch hintereinander geschaltet werden.
Hierzu bietet sich Queue im Prozess an.

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Rakefile Normal file
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require 'rubygems'
require 'rake'
begin
require 'jeweler'
Jeweler::Tasks.new do |gem|
gem.name = "robustserver"
gem.summary = %Q{Protects your Server against SIGS, unplaned exceptions and retries last action}
gem.description = %Q{}
gem.email = "Denis.Knauf@gmail.com"
gem.homepage = "http://github.com/DenisKnauf/robustserver"
gem.authors = ["Denis Knauf"]
gem.files = ["AUTHORS", "README.md", "VERSION", "lib/**/*.rb", "test/**/*.rb"]
gem.require_paths = ["lib"]
end
Jeweler::GemcutterTasks.new
rescue LoadError
puts "Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler"
end
require 'rake/testtask'
Rake::TestTask.new(:test) do |test|
test.libs << 'lib' << 'test' << 'ext'
test.pattern = 'test/**/*_test.rb'
test.verbose = true
end
begin
require 'rcov/rcovtask'
Rcov::RcovTask.new do |test|
test.libs << 'test'
test.pattern = 'test/**/*_test.rb'
test.verbose = true
end
rescue LoadError
task :rcov do
abort "RCov is not available. In order to run rcov, you must: sudo gem install spicycode-rcov"
end
end
task :test => :check_dependencies
task :default => :test
require 'rake/rdoctask'
Rake::RDocTask.new do |rdoc|
if File.exist?('VERSION')
version = File.read('VERSION')
else
version = ""
end
rdoc.rdoc_dir = 'rdoc'
rdoc.title = "sbdb #{version}"
rdoc.rdoc_files.include('README*')
rdoc.rdoc_files.include('lib/**/*.rb')
end

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VERSION Normal file
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0.0.0

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lib/robustserver.rb Normal file
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module Signal
def signame s
case s
when String then s
when Symbol then s.to_s
when Fixnum then list.invert[s]
end
end
def sig s
case s
when Fixnum then s
when String then list[s]
when Symbol then list[s.to_s]
end
end
list do |n, s|
Signal.const_set n, s
Signal.const_set "SIG#{n}", s
end
def [] s
case s
when String then list[s]
when Symbol then list[s.to_s]
when Fixnum then list.invert[s]
else raise ArgumentError
end
end
end
class Retries
attr_accessor :max, :range
attr_reader :count, :last
def initialize max = 10, range = 10
@max, @range, @count, @last = max, range, 0, Time.now
end
def retry?
@count = @last + @range > Time.now ? @count + 1 : 1
@last = Time.now
@count < @max
end
def run ex, &e
begin e.call *args
rescue ex
retries.retry? and retry
end
end
end
class RobustServer
def self.main *argv
self.new( *argv).main
end
def initialize *p
super *p
sh = method :signal_handler
@sigs = {
Signal[:INT] => sh, Signal[:HUP] => nil, Signal[:TERM] => sh,
Signal[:KILL] => sh, Signal[:USR1] => nil, Signal[:USR2] => nil
}
end
def trapping
@sigs.each { |s, p| @sigs[s] = trap s, p } if @sigs
end
def signal_handler s
@signal = s
end
def main max = nil, range = nil
retries = Retries.new max, range
trapping
$stderr.puts "Arbeit wird nun aufgenommen..."
begin
self.run
rescue SystemExit, Interrupt, SignalException
$stderr.puts "Das Beenden des Programms wurde angefordert. #{$!}"
rescue Object
$stderr.puts [:rescue, $!, $!.class, $!.backtrace].inspect
retry if retries.retry?
$stderr.print "Zuviele Fehler in zu kurzer Zeit. Ich gebe auf und "
end
trapping
$stderr.puts "Beende mich selbst."
end
end