Class: Onceler::Recorder

Inherits:
Object
  • Object
show all
Includes:
Transactions
Defined in:
lib/onceler/recorder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Transactions

#begin_transaction, #rollback_transaction

Constructor Details

#initialize(group_class) ⇒ Recorder

Returns a new instance of Recorder.



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# File 'lib/onceler/recorder.rb', line 26

def initialize(group_class)
  @group_class = group_class
  @recordings = []
  @named_recordings = []
  @arounds = []
end

Instance Attribute Details

#tape ⇒ Object

Returns the value of attribute tape.



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# File 'lib/onceler/recorder.rb', line 24

def tape
  @tape
end

Instance Method Details

#<<(block) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 37

def <<(block)
  @recordings << Recording.new(block)
end

#[](name) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 46

def [](name)
  if @retvals && @retvals.key?(name)
    @retvals[name]
  elsif parent
    parent[name]
  end
end

#[]=(name, block) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 41

def []=(name, block)
  @named_recordings << name
  @recordings << NamedRecording.new(block, name)
end

#add_around(block) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 54

def add_around(block)
  @arounds.unshift(block)
end

#begin_transactions! ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 139

def begin_transactions!
  Onceler.open_transactions += 1
  transactional_connections.each do |connection|
    begin_transaction(connection)
  end
end

#hooks ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 99

def hooks
  @hooks ||= {
    before: {record: [], reset: []},
    after:  {record: [], reset: []}
  }
end

#parent ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 95

def parent
  @group_class.parent_onceler
end

#parent_tape ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 33

def parent_tape
  parent.tape || parent.parent_tape if parent
end

#record! ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 58

def record!
  Onceler.recording = true
  begin_transactions!
  @tape = @group_class.new
  @tape.send :extend, Recordable
  @tape.copy_from(parent_tape) if parent_tape

  run_before_hooks(:record, @tape)
  # we don't know the order named recordings will be called (or if
  # they'll call each other), so prep everything first
  @recordings.each do |recording|
    recording.prepare_medium!(@tape)
  end

  # wrap the before in a lambda
  stack = -> do
    @recordings.each do |recording|
      recording.record_onto!(@tape)
    end
  end
  # and then stack each around block on top
  @arounds.inject(stack) do |old_stack, hook|
    -> { @tape.instance_exec(old_stack, &hook) }
  end.call

  run_after_hooks(:record, @tape)
  @data = @tape.__data
ensure
  Onceler.recording = false
end

#replay_into!(instance) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 128

def replay_into!(instance)
  @ivars, @retvals = Marshal.load(@data)
  @ivars.each do |key, value|
    instance.instance_variable_set(key, value)
  end
end

#reset! ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 89

def reset!
  run_before_hooks(:reset)
  rollback_transactions!
  run_after_hooks(:reset)
end

#rollback_transactions! ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 146

def rollback_transactions!
  transactional_connections.each do |connection|
    rollback_transaction(connection)
  end
ensure
  Onceler.open_transactions -= 1
end

#run_after_hooks(scope, context = nil) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 117

def run_after_hooks(scope, context = nil)
  hooks[:after][scope].each do |hook|
    context ? context.instance_eval(&hook) : hook.call
  end
  if parent
    parent.run_after_hooks(scope, context)
  else
    Onceler.configuration.run_hooks(:after, scope, context)
  end
end

#run_before_hooks(scope, context = nil) ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 106

def run_before_hooks(scope, context = nil)
  if parent
    parent.run_before_hooks(scope, context)
  else
    Onceler.configuration.run_hooks(:before, scope, context)
  end
  hooks[:before][scope].each do |hook|
    context ? context.instance_eval(&hook) : hook.call
  end
end

#transactional_connections ⇒ Object 



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# File 'lib/onceler/recorder.rb', line 135

def transactional_connections
  @group_class.onceler_connections
end