Class: Qwe::DB::Record

Inherits:
Object
  • Object
show all
Includes:
DRb::DRbUndumped
Defined in:
lib/qwe/db/record.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, server_dir, create: nil, **args) ⇒ Record

Returns a new instance of Record.



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# File 'lib/qwe/db/record.rb', line 82

def initialize(id, server_dir, create: nil, **args)
  @dir = File.join(server_dir, "records", id.to_s)
  self.id = id

  if create
    Qwe::DB::Server.mkdir(dir)
    @meta = args
    @meta["commits_length"] = 0
    File.write(meta_file, JSON.generate(args))
    if create.is_a?(Class)
      create_object(create)
    elsif create.is_a?(Symbol)
      create_object(Object.module_eval(create.to_s))
    elsif create.is_a?(String)
      self.object = Marshal.load(create)
      File.binwrite(File.join(dir, "0"), create)
    else
      self.object = create
      dump_object
    end
  else
    @meta = JSON.parse(File.read(meta_file))
    self.object = Marshal.load(File.binread(File.join(dir, "dump")))
  end

  if object.respond_to?(:record=)
    object.record = self
  end
end

Instance Attribute Details

#dir ⇒ Object (readonly)

Returns the value of attribute dir.



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# File 'lib/qwe/db/record.rb', line 62

def dir
  @dir
end

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/qwe/db/record.rb', line 62

def id
  @id
end

#meta ⇒ Object (readonly)

Returns the value of attribute meta.



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# File 'lib/qwe/db/record.rb', line 62

def meta
  @meta
end

#object ⇒ Object

Returns the value of attribute object.



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# File 'lib/qwe/db/record.rb', line 62

def object
  @object
end

Class Method Details

._load ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 11

def self._load(...)
  nil
end

Instance Method Details

#_dump ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 7

def _dump(...)
  ""
end

#archive ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 168

def archive
  archive!
rescue => e
  log "Error archiving #{id}: #{e.full_message}"
end

#archive! ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 174

def archive!
  log "Archive record #{id}"
  commits_file.archive!
end

#commit(str) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 37

def commit(str)
  @meta["commits_length"] += str.count("\n")
  commits_file.write(str)
  unless str[-1] == "\n"
    commits_file.write("\n")
    @meta["commits_length"] += 1
  end
  self
rescue => e
  log "Can't write commit #{str}: #{e.full_message}"
  self
end

#commits(commit_id = nil) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 124

def commits(commit_id = nil)
  commits_file.read(commit_id)
end

#commits_file ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 64

def commits_file
  @commits_file ||= CommitsFile.new(@dir)
end

#commits_length ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 54

def commits_length
  @meta["commits_length"]
end

#commits_length=(v) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 50

def commits_length=(v)
  @meta["commits_length"] = v
end

#create_object(klass) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 76

def create_object(klass)
  self.object = klass.new
  object.init if klass.include?(Qwe::Mixins::Root)
  dump_object
end

#detach ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 134

def detach
  Worker.instance.detach(id, self)
end

#detach_at ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 15

def detach_at
  @detach_at || keep
end

#dump ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 68

def dump
  Marshal.dump(object)
end

#dump_object ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 72

def dump_object
  File.binwrite(File.join(dir, commits_length.to_s), dump)
end

#evaluate(rb) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 164

def evaluate(rb)
  object.instance_eval(rb)
end

#fork(commit_id = nil) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 138

def fork(commit_id = nil)
  log "Fork at commit id #{commit_id}"
  commit_id ||= commits_length

  zero = File.binread(File.join(dir, "0"))
  rec = Worker.instance.allocate_record(zero)

  commits = commits(commit_id)
  rec.commits_length = commit_id + 1

  begin
    rec.object.instance_eval(commits)
  rescue ScriptError, StandardError => e
    log e.full_message
    log "Commits are:\n\n#{commits}\n\n"
  end

  if rec.commits.length > 0
    log "Commits should not produce another commits:", "\n" + rec.commits
    raise "Commits loop detected"
  end

  rec.commits_file.write(commits)
  rec
end

#keep ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 19

def keep
  @detach_at = Time.now + Worker.instance.detach_timeout
end

#meta_file ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 58

def meta_file
  File.join(@dir, "meta")
end

#object_at(commit_id) ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 128

def object_at(commit_id)
  o = Marshal.load File.read(File.join(dir, "0"))
  o.instance_eval commits(commit_id)
  o
end

#save ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 112

def save
  save!
rescue => e
  log "Can't save record #{id}: #{e.full_message} #{e.backtrace}"
end

#save! ⇒ Object 



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# File 'lib/qwe/db/record.rb', line 118

def save!
  commits_file.close
  File.binwrite(File.join(dir, "dump"), dump)
  File.write(meta_file, JSON.generate(@meta))
end

#should_detach? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/qwe/db/record.rb', line 23

def should_detach?
  detach_at < Time.now
end