Class: Xampl::Persister

Inherits:
Object
  • Object
show all
Defined in:
lib/xamplr/persister.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name = nil, format = nil) ⇒ Persister

Returns a new instance of Persister.



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# File 'lib/xamplr/persister.rb', line 20

def initialize(name=nil, format=nil)
  @name = name
  @format = format
  @automatic = false
  @changed = {}
  @expunged = Set.new
  @cache_hits = 0
  @total_cache_hits = 0
  @read_count = 0
  @total_read_count = 0
  @write_count = 0
  @total_write_count = 0
  @last_write_count = 0
  @last_cache_hits = 0
  @total_sync_count = 0
  @total_rollback_count = 0
  @rolled_back = false
  @syncing = false
  @slow_sync = 0.25

  @busy_count = 0
end

Instance Attribute Details

#automatic ⇒ Object

Returns the value of attribute automatic.



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# File 'lib/xamplr/persister.rb', line 7

def automatic
  @automatic
end

#block_changes ⇒ Object

Returns the value of attribute block_changes.



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# File 'lib/xamplr/persister.rb', line 7

def block_changes
  @block_changes
end

#cache_hits ⇒ Object

Returns the value of attribute cache_hits.



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# File 'lib/xamplr/persister.rb', line 7

def cache_hits
  @cache_hits
end

#expunged ⇒ Object

Returns the value of attribute expunged.



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# File 'lib/xamplr/persister.rb', line 7

def expunged
  @expunged
end

#format ⇒ Object (readonly)

Returns the value of attribute format.



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# File 'lib/xamplr/persister.rb', line 18

def format
  @format
end

#last_write_count ⇒ Object

Returns the value of attribute last_write_count.



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# File 'lib/xamplr/persister.rb', line 7

def last_write_count
  @last_write_count
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/xamplr/persister.rb', line 7

def name
  @name
end

#read_count ⇒ Object

Returns the value of attribute read_count.



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# File 'lib/xamplr/persister.rb', line 7

def read_count
  @read_count
end

#rolled_back ⇒ Object

Returns the value of attribute rolled_back.



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# File 'lib/xamplr/persister.rb', line 7

def rolled_back
  @rolled_back
end

#slow_sync ⇒ Object

Returns the value of attribute slow_sync.



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# File 'lib/xamplr/persister.rb', line 7

def slow_sync
  @slow_sync
end

#syncing ⇒ Object (readonly)

Returns the value of attribute syncing.



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# File 'lib/xamplr/persister.rb', line 18

def syncing
  @syncing
end

#total_cache_hits ⇒ Object

Returns the value of attribute total_cache_hits.



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# File 'lib/xamplr/persister.rb', line 7

def total_cache_hits
  @total_cache_hits
end

#total_read_count ⇒ Object

Returns the value of attribute total_read_count.



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# File 'lib/xamplr/persister.rb', line 7

def total_read_count
  @total_read_count
end

#total_rollback_count ⇒ Object

Returns the value of attribute total_rollback_count.



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# File 'lib/xamplr/persister.rb', line 7

def total_rollback_count
  @total_rollback_count
end

#total_sync_count ⇒ Object

Returns the value of attribute total_sync_count.



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# File 'lib/xamplr/persister.rb', line 7

def total_sync_count
  @total_sync_count
end

#total_write_count ⇒ Object

Returns the value of attribute total_write_count.



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# File 'lib/xamplr/persister.rb', line 7

def total_write_count
  @total_write_count
end

#write_count ⇒ Object

Returns the value of attribute write_count.



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# File 'lib/xamplr/persister.rb', line 7

def write_count
  @write_count
end

Class Method Details

.replace(old_xampl, new_xampl) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 105

def Persister.replace(old_xampl, new_xampl)
  pid = old_xampl.get_the_index
  if old_xampl.persister != @@persister then
    raise MixedPersisters.new(@@persister, old_xampl.persister)
  end
  if new_xampl.persister != @@persister then
    raise MixedPersisters.new(@@persister, new_xampl.persister)
  end

  new_xampl.note_replacing(old_xampl)

  unless old_xampl.load_needed then
    Xampl.log.warn("Replacing live xampl: #{old_xampl} pid: #{pid}")
    @@persister.uncache(old_xampl)
    old_xampl.invalidate
  end
  new_xampl.pid = nil
  new_xampl.pid = pid
  @@persister.introduce(new_xampl)
end

Instance Method Details

#busy(yes) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 55

def busy(yes)
  if yes then
    @busy_count += 1
  elsif 0 < @busy_count then
    @busy_count -= 1
  end
end

#cache(xampl) ⇒ Object

Raises:



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# File 'lib/xamplr/persister.rb', line 93

def cache(xampl)
  raise XamplException.new(:unimplemented)
end

#clear_cache ⇒ Object

Raises:



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# File 'lib/xamplr/persister.rb', line 101

def clear_cache
  raise XamplException.new(:unimplemented)
end

#close ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 46

def close
  self.sync
end

#count_changed ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 86

def count_changed
#      @changed.each{ | thing, ignore |
  #        puts "changed: #{thing}, index: #{thing.get_the_index}"
  #      }
  return @changed.size
end

#do_sync_write ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 224

def do_sync_write
  unchanged_in_changed_list = 0
  @changed.each do |xampl, ignore|
    unchanged_in_changed_list += 1 unless xampl.is_changed
    unless xampl.kind_of?(InvalidXampl) then
      write(xampl)
    end
  end
end

#done_sync_write ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 220

def done_sync_write
  # only if needed
end

#expunge(xampl) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 173

def expunge(xampl)
  false
end

#find_known(klass, pid) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 193

def find_known(klass, pid)
  #raise XamplException.new(:live_across_rollback) if @rolled_back

  xampl = read_from_cache(klass, pid, nil)

  return xampl
end

#find_xampl(hint = false) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 165

def find_xampl(hint=false)
  if hint then
    return [], "no query made"
  else
    return []
  end
end

#has_changed(xampl) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 74

def has_changed(xampl)
  if xampl.persist_required && xampl.is_changed then
    raise MixedPersisters.new(xampl.persister, self) unless self == xampl.persister
    @changed[xampl] = xampl
  end
end

#has_not_changed(xampl) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 81

def has_not_changed(xampl)
  #       puts "!!!! has_not_changed #{xampl} #{xampl.get_the_index} -- in @changed: #{nil != @changed[xampl]}"
  @changed.delete(xampl) if xampl
end

#introduce(xampl) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 67

def introduce(xampl)
  if xampl.introduce_persister(self) then
    cache(xampl)
  end
  has_changed(xampl) if xampl.is_changed
end

#is_busy ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 63

def is_busy
  return 0 < @busy_count
end

#lazy_load(target, klass, pid) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 201

def lazy_load(target, klass, pid)
  #      puts "#{File.basename(__FILE__)} #{__LINE__} LAZY_LOAD:: klass: #{klass} pid: #{pid} target: #{target}"

  xampl = read(klass, pid, target)

  # puts "   LAZY_LOAD --> #{xampl}"

  return xampl
end

#lookup(klass, pid) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 177

def lookup(klass, pid)
  #raise XamplException.new(:live_across_rollback) if @rolled_back
  #puts "#{File.basename(__FILE__)} #{__LINE__} LOOKUP:: klass: #{klass} pid: #{pid}"

  begin
    busy(true)
    xampl = read(klass, pid)
  ensure
    busy(false)
  end

  #puts "#{File.basename(__FILE__)} #{__LINE__}       ---> #{ xampl }"

  return xampl
end

#optimise(opts) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 43

def optimise(opts)
end

#print_stats ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 316

def print_stats
  printf("SYNC[%s]:: TOTAL cache_hits: %d, reads: %d, writes: %d\n",
         self.name, @total_cache_hits, @total_read_count, @total_write_count)
  printf("             cache_hits: %d, reads: %d, writes: %d, time: %fms \n",
         @last_cache_hits, @read_count, @last_write_count, @last_sync_time)
  printf("             syncs: %d\n", @total_sync_count)
  if 0 < @changed.size then
    printf("             changed count: %d (%d)\n", count_changed, @changed.size)
    @changed.each do |thing, ignore|
      if thing.is_changed then
        puts "             changed: #{thing}, index: #{thing.get_the_index}"
      else
        puts "             UNCHANGED: #{thing}, index: #{thing.get_the_index} <<<<<<<<<<<<<<<<<<< BAD!"
      end
    end
  end
end

#put_changed(msg = "") ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 211

def put_changed(msg="")
  puts "Changed::#{msg}:"
  @changed.each { |xampl, ignore| puts " #{xampl.tag} #{xampl.get_the_index}" }
end

#query_implemented ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 161

def query_implemented
  false
end

#read(klass, pid, target = nil) ⇒ Object

Raises:



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# File 'lib/xamplr/persister.rb', line 157

def read(klass, pid, target=nil)
  raise XamplException.new(:unimplemented)
end

#realise(representation, target = nil) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 136

def realise(representation, target=nil)
  # This is a bit brutal, but it works (and, anyway, it *is* the rule is that this is supposed to be UTF-8)
  representation_fixed = representation.encode('UTF-8', :invalid => :replace, :undef => :replace)

  xampl = nil

  # These days 'new' representations can only be XML. Historically it could have been Ruby. Check the
  # representations (quickly) and choose appropriately.
  if '<' == representation_fixed[0] then
    # well it isn't ruby, so it must be XML. Of course this means no leading whitespace, which happens to be true.
    xampl = XamplObject.realise_from_xml_string(representation_fixed, target)
  else
    xampl = XamplObject.from_ruby(representation_fixed, target)
  end
  return xampl.note_realised
end

#represent(xampl, mentions = []) ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 126

def represent(xampl, mentions=[])
  rep = xampl.persist("", mentions)
  return rep
rescue => e
  msg = "Failed to represent #{ xampl } due to: #{ e }"
  puts msg
  puts e.backtrace
  raise msg
end

#rollback ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 302

def rollback
  begin
    busy(true)

    return Xampl.rollback(self)
  ensure
    busy(false)
  end
end

#rollback_cleanup ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 312

def rollback_cleanup
  @changed = {}
end

#shutdown ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 50

def shutdown
#      self.sync
#      self.close
end

#start_sync_write ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 216

def start_sync_write
  #only if needed
end

#sync ⇒ Object 



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# File 'lib/xamplr/persister.rb', line 234

def sync
  @last_sync_time = Time.now
  #raise XamplException.new(:live_across_rollback) if @rolled_back
  begin
    if 0 < @changed.size then
#          puts "#{ __FILE__ }:#{ __LINE__ } [#{__method__}] SYNC changed: #{@changed.size}"
#          @changed.each do | key, value |
#            puts "    key: #{key.class.name}, pid: #{key.get_the_index}"
#          end

#          caller(0).each do | trace |
#            next if /xamplr/ =~ trace
#            puts " #{trace}"
#            break if /actionpack/ =~ trace
#          end

      duration = Time.now
      begin
        busy(true)
        @syncing = true

        start_sync_write
        do_sync_write
      ensure
        done_sync_write
        @syncing = false
      end

      duration = Time.now - duration
      if @slow_sync < duration.to_f then
        puts "#{ __FILE__ }:#{ __LINE__ } [#{__method__}] SLOW SYNC(#{ duration.to_f }s), changed: #{ @changed.size }"
        @changed.each do |key, value|
          puts "    key: #{ key.class.name }, pid: #{ key.get_the_index }"
        end
      end
    end

    @changed = {}

    puts "SOME NOT EXPUNGED: #{ @expunged.inspect }" unless 0 == @expunged.size
    @expunged = Set.new

    @total_read_count += @read_count
    @total_write_count += @write_count
    @total_cache_hits += @cache_hits
    @total_sync_count += 1

    @last_cache_hits = @cache_hits
    @last_write_count = @write_count
    @cache_hits = 0
    @read_count = 0
    @write_count = 0

    self.sync_done()

    return @last_write_count
  ensure
    busy(false)
#        puts "#{ __FILE__ }:#{ __LINE__ } [#{__method__}] **** SYNCING IS FALSE"
    @syncing = false
    @last_sync_time = Time.now - @last_sync_time
  end
end

#sync_done ⇒ Object

Raises:



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# File 'lib/xamplr/persister.rb', line 298

def sync_done
  raise XamplException.new(:unimplemented)
end

#uncache(xampl) ⇒ Object

Raises:



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# File 'lib/xamplr/persister.rb', line 97

def uncache(xampl)
  raise XamplException.new(:unimplemented)
end

#write(xampl) ⇒ Object

Raises:



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# File 'lib/xamplr/persister.rb', line 153

def write(xampl)
  raise XamplException.new(:unimplemented)
end