Class: WEEL::DSLRealization

Inherits:
Object
  • 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 477

def  initialize #{{{
  @__weel_search_positions = {}
  @__weel_positions = Array.new
  @__weel_main = nil
  @__weel_data ||= Hash.new
  @__weel_endpoints ||= Hash.new
  @__weel_connectionwrapper = ConnectionWrapperBase
  @__weel_connectionwrapper_args = []
  @__weel_state = :ready
  @__weel_status = Status.new(0,"undefined")
  @__weel_sim = false
  @__weel_lock = Mutex.new
end

Instance Attribute Details

#__weel_connectionwrapper ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

def __weel_connectionwrapper
  @__weel_connectionwrapper
end

#__weel_connectionwrapper_args ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

def __weel_connectionwrapper_args
  @__weel_connectionwrapper_args
end

#__weel_data ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

def __weel_data
  @__weel_data
end

#__weel_endpoints ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

def __weel_endpoints
  @__weel_endpoints
end

#__weel_main ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

def __weel_main
  @__weel_main
end

#__weel_positions ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

def __weel_positions
  @__weel_positions
end

#__weel_search_positions ⇒ Object

}}}



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# File 'lib/weel.rb', line 490

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 491

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 491

def __weel_status
  @__weel_status
end

Instance Method Details

#__weel_finalize ⇒ Object

{{{



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# File 'lib/weel.rb', line 1055

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

#alternative(condition, args = {}, &block) ⇒ 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 650

def alternative(condition,args={},&block)# {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  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 = __weel_eval_condition(condition, args)
    end
    Thread.current[:alternative_executed][-1] = true if condition
  end
  searchmode = __weel_is_in_search_mode
  __weel_protect_yield(&block) if searchmode || condition
  Thread.current[:alternative_executed][-1] = true if __weel_is_in_search_mode != searchmode # we swiched from searchmode true to false, thus branch has been executed which is as good as evaling the condition to true
end

#call(position, endpoint, parameters: {}, finalize: nil, update: nil, prepare: nil, salvage: 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 501

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

#choose(mode = :inclusive, &block) ⇒ 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 629

def choose(mode=:inclusive,&block) # {{{
  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

  cw = @__weel_connectionwrapper.new @__weel_connectionwrapper_args

  cw.split_branches Thread.current.__id__
  __weel_protect_yield(&block)
  cw.join_branches Thread.current.__id__

  Thread.current[:alternative_executed].pop
  Thread.current[:alternative_mode].pop
  nil
end

#critical(id, &block) ⇒ Object

Defines a critical block (=Mutex)



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# File 'lib/weel.rb', line 670

def critical(id,&block)# {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  @__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(&block)
  end
end

#escape ⇒ Object

}}}



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# File 'lib/weel.rb', line 732

def escape #{{{
  return if __weel_is_in_search_mode
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  throw :escape
end

#loop(condition, args = {}, &block) ⇒ Object

Defines a Cycle (loop/iteration)



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# File 'lib/weel.rb', line 685

def loop(condition,args={},&block)# {{{
  unless 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(&block)
    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
  loop_guard = 0
  loop_id = SecureRandom.uuid
  catch :escape do
    case condition[1]
      when :pre_test
        while __weel_eval_condition(condition[0],args) && self.__weel_state != :stopping && self.__weel_state != :stopped && self.__weel_state != :finishing && !Thread.current[:nolongernecessary]
          loop_guard += 1
          __weel_protect_yield(&block)
          sleep 1 if @__weel_connectionwrapper::loop_guard(@__weel_connectionwrapper_args,loop_id,loop_guard)
        end
      when :post_test
        begin
          loop_guard += 1
          __weel_protect_yield(&block)
          sleep 1 if @__weel_connectionwrapper::loop_guard(@__weel_connectionwrapper_args,loop_id,loop_guard)
        end while __weel_eval_condition(condition[0],args) && self.__weel_state != :stopping && self.__weel_state != :stopped && self.__weel_state != :finishing && !Thread.current[:nolongernecessary]
    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 506

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 = {}, &block) ⇒ Object

}}}



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# File 'lib/weel.rb', line 664

def otherwise(args={},&block) # {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  __weel_protect_yield(&block) if __weel_is_in_search_mode || !Thread.current[:alternative_executed].last
end

#parallel(type = nil, &block) ⇒ 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 516

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

  Thread.current[:branches] = []
  Thread.current[:branch_traces] = {}
  Thread.current[:branch_traces_ids] = 0
  Thread.current[:branch_finished_count] = 0
  Thread.current[:branch_event] = Continue.new
  Thread.current[:mutex] = Mutex.new

  __weel_protect_yield(&block)

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

  cw = @__weel_connectionwrapper.new @__weel_connectionwrapper_args
  cw.split_branches Thread.current.__id__, Thread.current[:branch_traces]

  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 # sometimes start event might not even exist yet (i.e. race condition)
  end

  Thread.current[:branch_event].wait unless self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:branches].length == 0

  cw.join_branches Thread.current.__id__, Thread.current[:branch_traces]

  unless self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped
    # first set all to no_longer_neccessary, just in case, but this should not be necessary
    Thread.current[:branches].each do |thread|
      thread[:nolongernecessary] = true
      __weel_recursive_continue(thread)
    end
    # wait for all, they should not even exist at this point
    Thread.current[:branches].each do |thread|
      __weel_recursive_join(thread)
    end
  end
end

#parallel_branch(data = @__weel_data, &block) ⇒ Object

Defines a branch of a parallel-Construct



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# File 'lib/weel.rb', line 565

def parallel_branch(data=@__weel_data,&block)# {{{
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  branch_parent = Thread.current

  branch_parent[:branches] << Thread.new(data) do |*local|
    Thread.current.abort_on_exception = true
    Thread.current[:branch_search] = @__weel_search_positions.any?
    Thread.current[:branch_parent] = branch_parent
    Thread.current[:start_event] = Continue.new
    Thread.current[:local] = local
    Thread.current[:branch_wait_count_cancel_active] = false
    branch_parent[:mutex].synchronize do
      Thread.current[:branch_traces_id] = branch_parent[:branch_traces_ids]
      branch_parent[:branch_traces_ids] += 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 unless self.__weel_state == :stopping || self.__weel_state == :stopped || self.__weel_state == :finishing

    unless self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
      __weel_protect_yield(*local, &block)
    end

    branch_parent[:mutex].synchronize do
      branch_parent[:branch_finished_count] += 1

      if branch_parent[:branch_wait_count_cancel_condition] == :last
        if branch_parent[:branch_finished_count] == branch_parent[:branch_wait_count] && self.__weel_state != :stopping && self.__weel_state != :finishing
          branch_parent[:branches].each do |thread|
            if thread.alive? && thread[:branch_wait_count_cancel_active] == false
              thread[:nolongernecessary] = true
              __weel_recursive_continue(thread)
            end
          end
        end
      end

      if branch_parent[:branch_finished_count] == branch_parent[:branches].length && self.__weel_state != :stopping && self.__weel_state != :finishing
        branch_parent[:branch_event].continue
      end
    end
    unless 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_connectionwrapper::inform_position_change(@__weel_connectionwrapper_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 728

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 725

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

#stop(position) ⇒ Object

}}}



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# File 'lib/weel.rb', line 742

def stop(position) #{{{
  searchmode = __weel_is_in_search_mode(position)

  return if searchmode
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]

  # gather traces in threads to point to join
  if Thread.current[:branch_parent] && Thread.current[:branch_traces_id]
    Thread.current[:branch_parent][:branch_traces][Thread.current[:branch_traces_id]] ||= []
    Thread.current[:branch_parent][:branch_traces][Thread.current[:branch_traces_id]] << position
  end

  __weel_progress position, 0, true
  self.__weel_state = :stopping
end

#terminate ⇒ Object

}}}



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# File 'lib/weel.rb', line 737

def terminate #{{{
  return if __weel_is_in_search_mode
  return if self.__weel_state == :stopping || self.__weel_state == :finishing || self.__weel_state == :stopped || Thread.current[:nolongernecessary]
  self.__weel_state = :finishing
end

#test(code = nil, &blk) ⇒ Object

}}}



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# File 'lib/weel.rb', line 722

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

#🠊(code) ⇒ Object

DSL-Construct for translating expressions into static parameters



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# File 'lib/weel.rb', line 494

def 🠊(code); ProcString.new(code); end