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# -*- coding: binary -*-
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module Rex
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###
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#
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# This class is the concrete representation of an abstract job.
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#
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###
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class Job
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  #
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  # Creates an individual job instance and initializes it with the supplied
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  # parameters.
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  #
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  def initialize(container, jid, name, ctx, run_proc, clean_proc)
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    self.container  = container
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    self.jid        = jid
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    self.name       = name
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    self.run_proc   = run_proc
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    self.clean_proc = clean_proc
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    self.ctx        = ctx
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    self.start_time = nil
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    self.cleanup_mutex = Mutex.new
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    self.cleaned_up = false
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  end
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  def synchronized_cleanup
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    # Avoid start and stop both calling cleanup
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    self.cleanup_mutex.synchronize do
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      unless cleaned_up
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        self.cleaned_up = true
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        self.clean_proc.call(ctx) if self.clean_proc
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      end
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    end
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  end
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  #
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  # Runs the job in the context of its own thread if the async flag is false.
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  # Otherwise, the job is run inline.
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  #
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  def start(async = false)
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    self.start_time = ::Time.now
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    if (async)
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      self.job_thread = Rex::ThreadFactory.spawn("JobID(#{jid})-#{name}", false) {
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        # Deschedule our thread momentarily
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        ::IO.select(nil, nil, nil, 0.01)
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        begin
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          run_proc.call(ctx)
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        ensure
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          synchronized_cleanup
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          container.remove_job(self)
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        end
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      }
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    else
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      begin
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        run_proc.call(ctx)
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      rescue ::Exception
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        container.stop_job(jid)
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        raise $!
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      end
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    end
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  end
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  #
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  # Stops the job if it's currently running and calls its cleanup procedure
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  #
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  def stop
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    if (self.job_thread)
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      self.job_thread.kill
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      self.job_thread = nil
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    end
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    synchronized_cleanup
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  end
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  #
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  # The name of the job.
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  #
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  attr_reader :name
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  #
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  # The job identifier as assigned by the job container.
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  #
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  attr_reader :jid
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  #
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  # The time at which this job was started.
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  #
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  attr_reader :start_time
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  #
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  # Some job context.
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  #
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  attr_reader :ctx
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protected
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  attr_writer   :name #:nodoc:
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  attr_writer   :jid #:nodoc:
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  attr_accessor :job_thread #:nodoc:
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  attr_accessor :container #:nodoc:
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  attr_accessor :run_proc #:nodoc:
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  attr_accessor :clean_proc #:nodoc:
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  attr_writer   :ctx #:nodoc:
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  attr_writer   :start_time #:nodoc:
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  attr_accessor :cleanup_mutex #:nodoc:
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  attr_accessor :cleaned_up #:nodoc:
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end
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end
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