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PATH: opt / alt / ruby20 / lib64 / ruby / 2.0.0 / rake

module Rake

# A Promise object represents a promise to do work (a chore) in the
  # future. The promise is created with a block and a list of
  # arguments for the block. Calling value will return the value of
  # the promised chore.
  #
  # Used by ThreadPool.
  #
  class Promise               # :nodoc: all
    NOT_SET = Object.new.freeze # :nodoc:

attr_accessor :recorder

# Create a promise to do the chore specified by the block.
    def initialize(args, &block)
      @mutex = Mutex.new
      @result = NOT_SET
      @error = NOT_SET
      @args = args.collect { |a| begin; a.dup; rescue; a; end }
      @block = block
    end

# Return the value of this promise.
    #
    # If the promised chore is not yet complete, then do the work
    # synchronously. We will wait.
    def value
      unless complete?
        stat :sleeping_on, :item_id => object_id
        @mutex.synchronize do
          stat :has_lock_on, :item_id => object_id
          chore
          stat :releasing_lock_on, :item_id => object_id
        end
      end
      error? ? raise(@error) : @result
    end

# If no one else is working this promise, go ahead and do the chore.
    def work
      stat :attempting_lock_on, :item_id => object_id
      if @mutex.try_lock
        stat :has_lock_on, :item_id => object_id
        chore
        stat :releasing_lock_on, :item_id => object_id
        @mutex.unlock
      else
        stat :bailed_on, :item_id => object_id
      end
    end

private

# Perform the chore promised
    def chore
      if complete?
        stat :found_completed, :item_id => object_id
        return
      end
      stat :will_execute, :item_id => object_id
      begin
        @result = @block.call(*@args)
      rescue Exception => e
        @error = e
      end
      stat :did_execute, :item_id => object_id
      discard
    end

# Do we have a result for the promise
    def result?
      ! @result.equal?(NOT_SET)
    end

# Did the promise throw an error
    def error?
      ! @error.equal?(NOT_SET)
    end

# Are we done with the promise
    def complete?
      result? || error?
    end

# free up these items for the GC
    def discard
      @args = nil
      @block = nil
    end

# Record execution statistics if there is a recorder
    def stat(*args)
      @recorder.call(*args) if @recorder
    end

end

[-] rake_module.rb [edit]
[-] ruby182_test_unit_fix.rb [edit]
[-] tasklib.rb [edit]
[-] multi_task.rb [edit]
[-] clean.rb [edit]
[-] task_arguments.rb [edit]
[+] lib
[+] contrib
[+] ext
[-] rule_recursion_overflow_error.rb [edit]
[-] pseudo_status.rb [edit]
[-] promise.rb [edit]
[-] version.rb [edit]
[-] task_argument_error.rb [edit]
[-] pathmap.rb [edit]
[-] thread_pool.rb [edit]
[+] loaders
[-] dsl_definition.rb [edit]
[-] early_time.rb [edit]
[-] cloneable.rb [edit]
[-] thread_history_display.rb [edit]
[-] invocation_exception_mixin.rb [edit]
[-] default_loader.rb [edit]
[-] file_list.rb [edit]
[-] rake_test_loader.rb [edit]
[-] alt_system.rb [edit]
[-] phony.rb [edit]
[-] runtest.rb [edit]
[-] testtask.rb [edit]
[-] name_space.rb [edit]
[+] ..
[-] backtrace.rb [edit]
[-] task_manager.rb [edit]
[-] file_utils.rb [edit]
[-] invocation_chain.rb [edit]
[-] win32.rb [edit]
[-] rdoctask.rb [edit]
[-] trace_output.rb [edit]
[-] file_creation_task.rb [edit]
[-] task.rb [edit]
[-] application.rb [edit]
[-] classic_namespace.rb [edit]
[-] file_utils_ext.rb [edit]
[-] file_task.rb [edit]
[-] gempackagetask.rb [edit]
[-] private_reader.rb [edit]
[-] packagetask.rb [edit]