Class: WEEL::DSLRealization

Inherits:
Object show all
Defined in:
lib/weel.rb

Overview

}}}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DSLRealization

{{{



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# File 'lib/weel.rb', line 334

def  initialize #{{{
  @__weel_search_positions = {}
  @__weel_positions = Array.new
  @__weel_main = nil
  @__weel_data ||= Hash.new
  @__weel_endpoints ||= Hash.new
  @__weel_handlerwrapper = HandlerWrapperBase
  @__weel_handlerwrapper_args = []
  @__weel_state = :ready
  @__weel_status = Status.new(0,"undefined")
  @__weel_sim = -1
end

Instance Attribute Details

#__weel_data ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_data
  @__weel_data
end

#__weel_endpoints ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_endpoints
  @__weel_endpoints
end

#__weel_handlerwrapper ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_handlerwrapper
  @__weel_handlerwrapper
end

#__weel_handlerwrapper_args ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_handlerwrapper_args
  @__weel_handlerwrapper_args
end

#__weel_main ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_main
  @__weel_main
end

#__weel_positions ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_positions
  @__weel_positions
end

#__weel_search_positions ⇒ Object

}}}



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# File 'lib/weel.rb', line 346

def __weel_search_positions
  @__weel_search_positions
end

#__weel_state ⇒ Object

Returns the value of attribute __weel_state.



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# File 'lib/weel.rb', line 347

def __weel_state
  @__weel_state
end

#__weel_status ⇒ Object (readonly)

Returns the value of attribute __weel_status.



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# File 'lib/weel.rb', line 347

def __weel_status
  @__weel_status
end

Instance Method Details

#__weel_finalize ⇒ Object

{{{



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# File 'lib/weel.rb', line 898

def __weel_finalize #{{{
  __weel_recursive_join(@__weel_main)
  @__weel_state = :stopped
  @__weel_handlerwrapper::inform_state_change @__weel_handlerwrapper_args, @__weel_state
end

#alternative(condition, args = {}) ⇒ Object

Defines a possible choice of a choose-Construct Block is executed if condition == true or searchmode is active (to find the starting position)



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# File 'lib/weel.rb', line 493

def alternative(condition,args={})# {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  hw, pos = __weel_sim_start(:alternative,args.merge(:mode => Thread.current[:alternative_mode].last, :condition => ((condition.is_a?(String) || condition.is_a?(Proc)) ? condition : nil))) if __weel_sim
  Thread.current[:mutex] ||= Mutex.new
  Thread.current[:mutex].synchronize do
    return if Thread.current[:alternative_mode][-1] == :exclusive && Thread.current[:alternative_executed][-1] == true
    if (condition.is_a?(String) || condition.is_a?(Proc)) && !__weel_sim
      condition = __weel_eval_condition(condition)
    end
    Thread.current[:alternative_executed][-1] = true if condition
  end
  __weel_protect_yield(&Proc.new) if __weel_is_in_search_mode || __weel_sim || condition
  __weel_sim_stop(:alternative,hw,pos,args.merge(:mode => Thread.current[:alternative_mode].last, :condition => ((condition.is_a?(String) || condition.is_a?(Proc)) ? condition : nil))) if __weel_sim
end

#call(position, endpoint, parameters: {}, finalize: nil, update: nil, &finalizeblk) ⇒ Object

DSL-Constructs for atomic calls to external services (calls) and pure context manipulations (manipulate). Calls can also manipulate context (after the invoking the external services) position: a unique identifier within the wf-description (may be used by the search to identify a starting point) endpoint: (only with :call) ep of the service parameters: (only with :call) service parameters



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# File 'lib/weel.rb', line 354

def call(position, endpoint, parameters: {}, finalize: nil, update: nil, &finalizeblk) #{{{
  __weel_activity(position,:call,endpoint,parameters,finalize||finalizeblk,update)
end

#choose(mode = :inclusive) ⇒ Object

Choose DSL-Construct Defines a choice in the Workflow path. May contain multiple execution alternatives



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# File 'lib/weel.rb', line 476

def choose(mode=:inclusive) # {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  Thread.current[:alternative_executed] ||= []
  Thread.current[:alternative_mode] ||= []
  Thread.current[:alternative_executed] << false
  Thread.current[:alternative_mode] << mode
  hw, pos = __weel_sim_start(:choose,:mode => Thread.current[:alternative_mode].last) if __weel_sim
  __weel_protect_yield(&Proc.new)
  __weel_sim_stop(:choose,hw,pos,:mode => Thread.current[:alternative_mode].last) if __weel_sim
  Thread.current[:alternative_executed].pop
  Thread.current[:alternative_mode].pop
  nil
end

#critical(id) ⇒ Object

Defines a critical block (=Mutex)



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# File 'lib/weel.rb', line 515

def critical(id)# {{{
  @__weel_critical ||= Mutex.new
  semaphore = nil
  @__weel_critical.synchronize do
    @__weel_critical_sections ||= {}
    semaphore = @__weel_critical_sections[id] ? @__weel_critical_sections[id] : Mutex.new
    @__weel_critical_sections[id] = semaphore if id
  end
  semaphore.synchronize do
    __weel_protect_yield(&Proc.new)
  end
end

#data ⇒ Object

}}}



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# File 'lib/weel.rb', line 597

def data # {{{
  ReadHash.new(@__weel_data,__weel_sim)
end

#endpoints ⇒ Object

}}}



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# File 'lib/weel.rb', line 600

def endpoints # {{{
  ReadHash.new(@__weel_endpoints)
end

#escape ⇒ Object

}}}



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# File 'lib/weel.rb', line 579

def escape #{{{
  return if __weel_is_in_search_mode
  throw :escape
end

#loop(condition, args = {}) ⇒ Object

Defines a Cycle (loop/iteration)



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# File 'lib/weel.rb', line 529

def loop(condition,args={})# {{{
  unless condition.is_a?(Array) && (condition[0].is_a?(Proc) || condition[0].is_a?(String)) && [:pre_test,:post_test].include?(condition[1]) && args.is_a?(Hash)
    raise "condition must be called pre_test{} or post_test{}"
  end
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  if __weel_is_in_search_mode
    catch :escape do
      __weel_protect_yield(&Proc.new)
    end
    if __weel_is_in_search_mode
      return
    else
      ### in case it was a :post_test we wake inside the loop so we can check
      ### condition first thing
      condition[1] = :pre_test
    end
  end
  if __weel_sim
    cond = condition[0].is_a?(Proc) ? true : condition[0]
    hw, pos = __weel_sim_start(:loop,args.merge(:testing=>condition[1],:condition=>cond))
    catch :escape do
      __weel_protect_yield(&Proc.new)
    end
    __weel_sim_stop(:loop,hw,pos,args.merge(:testing=>condition[1],:condition=>cond))
    return
  end
  catch :escape do
    case condition[1]
      when :pre_test
        while __weel_eval_condition(condition[0]) && self.__weel_state != :stopping && self.__weel_state != :stopped && self.__weel_state != :finishing
          __weel_protect_yield(&Proc.new)
        end
      when :post_test
        begin
          __weel_protect_yield(&Proc.new)
        end while __weel_eval_condition(condition[0]) && self.__weel_state != :stopping && self.__weel_state != :stopped && self.__weel_state != :finishing
    end
  end
end

#manipulate(position, parameters = nil, script = nil, &scriptblk) ⇒ Object

when two params, second param always script when block and two params, parameters stays



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# File 'lib/weel.rb', line 359

def manipulate(position, parameters=nil, script=nil, &scriptblk) #{{{
  if scriptblk.nil? && script.nil? && !parameters.nil?
    script, parameters = parameters, nil
  end
  __weel_activity(position,:manipulate,nil,parameters||{},script||scriptblk)
end

#otherwise(args = {}) ⇒ Object

}}}



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# File 'lib/weel.rb', line 507

def otherwise(args={}) # {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  hw, pos = __weel_sim_start(:otherwise,args.merge(:mode => Thread.current[:alternative_mode].last)) if __weel_sim
  __weel_protect_yield(&Proc.new) if __weel_is_in_search_mode || __weel_sim || !Thread.current[:alternative_executed].last
  __weel_sim_stop(:otherwise,hw,pos,args.merge(:mode => Thread.current[:alternative_mode].last)) if __weel_sim
end

#parallel(type = nil) ⇒ Object

Parallel DSL-Construct Defines Workflow paths that can be executed parallel. May contain multiple branches (parallel_branch)



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# File 'lib/weel.rb', line 369

def parallel(type=nil)# {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]

  Thread.current[:branches] = []
  Thread.current[:branch_finished_count] = 0
  Thread.current[:branch_event] = Continue.new
  Thread.current[:mutex] = Mutex.new

  hw, pos = __weel_sim_start(:parallel) if __weel_sim

  __weel_protect_yield(&Proc.new)

  Thread.current[:branch_wait_count] = (type.is_a?(Hash) && type.size == 1 && type[:wait] != nil && (type[:wait].is_a?(Integer) && type[:wait] > 0) ? type[:wait] : Thread.current[:branches].size)
  1.upto Thread.current[:branches].size do
    Thread.current[:branch_event].wait
  end

  Thread.current[:branches].each do |thread|
    # decide after executing block in parallel cause for coopis
    # it goes out of search mode while dynamically counting branches
    if Thread.current[:branch_search] == false
      thread[:branch_search] = false
    end
    thread[:start_event].continue
  end

  Thread.current[:branch_event].wait

  __weel_sim_stop(:parallel,hw,pos) if __weel_sim

  unless self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped
    # first set all to no_longer_neccessary
    Thread.current[:branches].each do |thread|
      if thread.alive?
        thread[:nolongernecessary] = true
        __weel_recursive_continue(thread)
      end
    end
    # wait for all
    Thread.current[:branches].each do |thread|
      __weel_recursive_join(thread)
    end
  end
end

#parallel_branch(*vars) ⇒ Object

Defines a branch of a parallel-Construct



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# File 'lib/weel.rb', line 415

def parallel_branch(*vars)# {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  branch_parent = Thread.current

  if __weel_sim
    # catch the potential execution in loops inside a parallel
    current_branch_sim_pos = branch_parent[:branch_sim_pos]
  end

  Thread.current[:branches] << Thread.new(*vars) do |*local|
    Thread.current.abort_on_exception = true
    Thread.current[:branch_status] = false
    Thread.current[:branch_parent] = branch_parent
    Thread.current[:start_event] = Continue.new

    if __weel_sim
      Thread.current[:branch_sim_pos] = @__weel_sim += 1
    end

    # parallel_branch could be possibly around an alternative. Thus thread has to inherit the alternative_executed
    # after branching, update it in the parent (TODO)
    if branch_parent[:alternative_executed] && branch_parent[:alternative_executed].length > 0
      Thread.current[:alternative_executed] = [branch_parent[:alternative_executed].last]
      Thread.current[:alternative_mode] = [branch_parent[:alternative_mode].last]
    end
    branch_parent[:branch_event].continue
    Thread.current[:start_event].wait

    if __weel_sim
      handlerwrapper = @__weel_handlerwrapper.new @__weel_handlerwrapper_args
      handlerwrapper.simulate(:parallel_branch,:start,Thread.current[:branch_sim_pos],current_branch_sim_pos)
    end

    __weel_protect_yield(*local, &Proc.new)

    __weel_sim_stop(:parallel_branch,handlerwrapper,current_branch_sim_pos) if __weel_sim

    branch_parent[:mutex].synchronize do
      Thread.current[:branch_status] = true
      branch_parent[:branch_finished_count] += 1
      if branch_parent[:branch_finished_count] == branch_parent[:branch_wait_count] && self.__weel_state != :stopping && self.__weel_state != :finishing
        branch_parent[:branch_event].continue
      end
    end
    if self.__weel_state != :stopping && self.__weel_state != :stopped && self.__weel_state != :finishing
      if Thread.current[:branch_position]
        @__weel_positions.delete Thread.current[:branch_position]
        begin
          ipc = {}
          ipc[:unmark] = [Thread.current[:branch_position]]
          @__weel_handlerwrapper::inform_position_change(@__weel_handlerwrapper_args,ipc)
        end rescue nil
        Thread.current[:branch_position] = nil
      end
    end
  end
end

#post_test(code = nil, &blk) ⇒ Object

}}}



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# File 'lib/weel.rb', line 575

def post_test(code=nil,&blk)# {{{
  [code || blk, :post_test]
end

#pre_test(code = nil, &blk) ⇒ Object

}}}



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# File 'lib/weel.rb', line 572

def pre_test(code=nil,&blk)# {{{
  [code || blk, :pre_test]
end

#status ⇒ Object

}}}



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# File 'lib/weel.rb', line 594

def status # {{{
  @__weel_status
end

#stop(position) ⇒ Object

}}}



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# File 'lib/weel.rb', line 587

def stop(position) #{{{
  searchmode = __weel_is_in_search_mode(position)
  return if searchmode
  __weel_progress searchmode, position, true
  self.__weel_state = :stopping
end

#terminate ⇒ Object

}}}



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# File 'lib/weel.rb', line 583

def terminate #{{{
  return if __weel_is_in_search_mode
  self.__weel_state = :finishing
end

#test(code = nil, &blk) ⇒ Object

}}}



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# File 'lib/weel.rb', line 569

def test(code=nil,&blk)# {{{
  code || blk
end