Module: ConcurrentStream

Defined in:
lib/rbbt/util/misc/concurrent_stream.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#abort_callback ⇒ Object

Returns the value of attribute abort_callback.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def abort_callback
  @abort_callback
end

#aborted ⇒ Object

Returns the value of attribute aborted.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def aborted
  @aborted
end

#autojoin ⇒ Object

Returns the value of attribute autojoin.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def autojoin
  @autojoin
end

#callback ⇒ Object

Returns the value of attribute callback.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def callback
  @callback
end

#filename ⇒ Object

Returns the value of attribute filename.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def filename
  @filename
end

#joined ⇒ Object

Returns the value of attribute joined.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def joined
  @joined
end

#lockfile ⇒ Object

Returns the value of attribute lockfile.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def lockfile
  @lockfile
end

#log ⇒ Object

Returns the value of attribute log.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def log
  @log
end

#no_fail ⇒ Object

Returns the value of attribute no_fail.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def no_fail
  @no_fail
end

#pair ⇒ Object

Returns the value of attribute pair.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def pair
  @pair
end

#pids ⇒ Object

Returns the value of attribute pids.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def pids
  @pids
end

#stream_exception ⇒ Object

Returns the value of attribute stream_exception.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def stream_exception
  @stream_exception
end

#thread ⇒ Object

Returns the value of attribute thread.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def thread
  @thread
end

#threads ⇒ Object

Returns the value of attribute threads.



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 10

def threads
  @threads
end

Class Method Details

.setup(stream, options = {}, &block) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 12

def self.setup(stream, options = {}, &block)
  
  threads, pids, callback, abort_callback, filename, autojoin, lockfile, no_fail, pair = Misc.process_options options, :threads, :pids, :callback, :abort_callback, :filename, :autojoin, :lockfile, :no_fail, :pair
  stream.extend ConcurrentStream unless ConcurrentStream === stream

  stream.threads ||= []
  stream.pids ||= []
  stream.threads.concat(Array === threads ? threads : [threads]) unless threads.nil? 
  stream.pids.concat(Array === pids ? pids : [pids]) unless pids.nil? or pids.empty?
  stream.autojoin = autojoin unless autojoin.nil?
  stream.no_fail = no_fail unless no_fail.nil?

  stream.pair = pair unless pair.nil?

  callback = block if block_given?
  if callback
    if stream.callback
      old_callback = stream.callback
      stream.callback = Proc.new do
        old_callback.call
        callback.call
      end
    else
      stream.callback = callback 
    end
  end

  if abort_callback
    if stream.abort_callback
      old_abort_callback = stream.abort_callback
      stream.abort_callback = Proc.new do
        old_abort_callback.call
        abort_callback.call
      end
    else
      stream.abort_callback = abort_callback 
    end
  end

  stream.filename = filename unless filename.nil?

  stream.lockfile = lockfile unless lockfile.nil?

  stream.aborted = false

  stream
end

Instance Method Details

#abort(exception = nil) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 183

def abort(exception = nil)
  if @aborted
    Log.medium "Already aborted stream #{Misc.fingerprint self} [#{@aborted}]"
    return
  else
    Log.medium "Aborting stream #{Misc.fingerprint self} [#{@aborted}]"
  end
  AbortedStream.setup(self, exception)
  @aborted = true 
  begin
    close unless closed?

    @abort_callback.call exception if @abort_callback

    abort_threads(exception)
    abort_pids

    @callback = nil
    @abort_callback = nil

    @pair.abort exception if @pair
  ensure
    if lockfile and lockfile.locked?
      lockfile.unlock 
    end
  end
end

#abort_pids ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 172

def abort_pids
  @pids.each do |pid|
    begin 
      Log.low "Killing PID #{pid} in ConcurrentStream #{filename}"
      Process.kill :INT, pid 
    rescue Errno::ESRCH
    end
  end if @pids
  @pids = []
end

#abort_threads(exception = nil) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 144

def abort_threads(exception = nil)
  return unless @threads and @threads.any?
  name = Thread.current.inspect
  name = filename if filename
  Log.low "Aborting threads (#{name}) #{@threads.collect{|t| t.inspect } * ", "}"

  @threads.each do |t| 
    next if t == Thread.current
    Log.debug "Aborting thread (#{name}) #{t.inspect} with exception: #{exception}"
    t.raise((exception.nil? ? Aborted.new : exception))
  end 

  @threads.each do |t|
    next if t == Thread.current
    if t.alive? 
      sleep 1
      Log.low "Kill thread (#{name}) #{t.inspect}"
      t.kill
    end
    begin
      t.join unless t == Thread.current
    rescue Aborted
    rescue Exception
      Log.debug "Thread (#{name}) exception: #{$!.message}"
    end
  end
end

#aborted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 73

def aborted?
  @aborted
end

#add_callback(&block) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 228

def add_callback(&block)
  old_callback = callback
  @callback = Proc.new do 
    old_callback.call if old_callback
    block.call
  end
end

#annotate(stream) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 60

def annotate(stream)
  ConcurrentStream.setup(stream, :threads => threads, :pids => pids, :callback => callback, :abort_callback => abort_callback, :filename => filename, :autojoin => autojoin, :lockfile => lockfile)
  stream
end

#clear ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 65

def clear
  threads, pids, callback, abort_callback, joined = nil
end

#close(*args) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 211

def close(*args)
  if autojoin
    begin
      super(*args)
    rescue
      Log.exception $!
      self.abort
      self.join 
      stream_raise_exception $!
    ensure
      self.join if self.closed? or self.eof? 
    end
  else
    super(*args)
  end
end

#join ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 131

def join
  begin
    join_threads
    join_pids
    join_callback
    close unless closed?
  ensure
    @joined = true
    lockfile.unlock if lockfile and lockfile.locked?
    raise stream_exception if stream_exception
  end
end

#join_callback ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 121

def join_callback
  if @callback and not joined?
    begin
      @callback.call
    ensure
      @callback = nil
    end
  end
end

#join_pids ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 104

def join_pids
  if @pids and @pids.any?
    @pids.each do |pid| 
      begin
        Process.waitpid(pid, Process::WUNTRACED)
        if log
          stream_raise_exception ProcessFailed.new "Error joining process #{pid} in #{self.filename || self.inspect}. Last log line: #{log}" unless $?.success? or no_fail
        else
          stream_raise_exception ProcessFailed.new "Error joining process #{pid} in #{self.filename || self.inspect}" unless $?.success? or no_fail
        end
      rescue Errno::ECHILD
      end
    end 
    @pids = []
  end
end

#join_threads ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 77

def join_threads
  if @threads and @threads.any?
    @threads.each do |t| 
      next if t == Thread.current
      begin
        t.join
        if Process::Status === t.value
          if log
            raise ProcessFailed.new "Error joining process #{t.pid} in #{self.filename || self.inspect}. Last log line: #{log}" if ! (t.value.success? || no_fail)
          else
            raise ProcessFailed.new "Error joining process #{t.pid} in #{self.filename || self.inspect}" if ! (t.value.success? || no_fail)
          end
          raise ProcessFailed.new "Error joining process #{t.pid} in #{self.filename || self.inspect}. Last log line: #{log}" if ! (t.value.success? || no_fail)
        end
      rescue Exception
        if no_fail
          Log.low "Not failing on exception joining thread in ConcurrenStream: #{filename}"
        else
          Log.low "Exception joining thread in ConcurrenStream: #{filename}"
          stream_raise_exception $! 
        end
      end
    end
  end
  @threads = []
end

#joined? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 69

def joined?
  @joined
end

#stream_raise_exception(exception) ⇒ Object 



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# File 'lib/rbbt/util/misc/concurrent_stream.rb', line 236

def stream_raise_exception(exception)
  threads.each do |thread|
    thread.raise exception
  end
  self.stream_exception = exception

  self.abort
end