Module: ConcurrentStream

Defined in:
lib/scout/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/scout/concurrent_stream.rb', line 12

def abort_callback
  @abort_callback
end

#aborted ⇒ Object

Returns the value of attribute aborted.



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# File 'lib/scout/concurrent_stream.rb', line 12

def aborted
  @aborted
end

#autojoin ⇒ Object

Returns the value of attribute autojoin.



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# File 'lib/scout/concurrent_stream.rb', line 12

def autojoin
  @autojoin
end

#callback ⇒ Object

Returns the value of attribute callback.



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# File 'lib/scout/concurrent_stream.rb', line 12

def callback
  @callback
end

#filename ⇒ Object

Returns the value of attribute filename.



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# File 'lib/scout/concurrent_stream.rb', line 12

def filename
  @filename
end

#joined ⇒ Object

Returns the value of attribute joined.



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# File 'lib/scout/concurrent_stream.rb', line 12

def joined
  @joined
end

#lock ⇒ Object

Returns the value of attribute lock.



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# File 'lib/scout/concurrent_stream.rb', line 12

def lock
  @lock
end

#log ⇒ Object

Returns the value of attribute log.



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# File 'lib/scout/concurrent_stream.rb', line 12

def log
  @log
end

#next ⇒ Object

Returns the value of attribute next.



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# File 'lib/scout/concurrent_stream.rb', line 12

def next
  @next
end

#no_fail ⇒ Object

Returns the value of attribute no_fail.



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# File 'lib/scout/concurrent_stream.rb', line 12

def no_fail
  @no_fail
end

#pair ⇒ Object

Returns the value of attribute pair.



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# File 'lib/scout/concurrent_stream.rb', line 12

def pair
  @pair
end

#pids ⇒ Object

Returns the value of attribute pids.



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# File 'lib/scout/concurrent_stream.rb', line 12

def pids
  @pids
end

#std_err ⇒ Object

Returns the value of attribute std_err.



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# File 'lib/scout/concurrent_stream.rb', line 12

def std_err
  @std_err
end

#stream_exception ⇒ Object

Returns the value of attribute stream_exception.



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# File 'lib/scout/concurrent_stream.rb', line 12

def stream_exception
  @stream_exception
end

#thread ⇒ Object

Returns the value of attribute thread.



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# File 'lib/scout/concurrent_stream.rb', line 12

def thread
  @thread
end

#threads ⇒ Object

Returns the value of attribute threads.



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# File 'lib/scout/concurrent_stream.rb', line 12

def threads
  @threads
end

Class Method Details

.process_stream(stream, close: true, join: true, message: "process_stream", **kwargs, &block) ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 272

def self.process_stream(stream, close: true, join: true, message: "process_stream", **kwargs, &block)
  ConcurrentStream.setup(stream, **kwargs)
  begin
    begin
      yield
    ensure
      stream.close if close && stream.respond_to?(:close) && ! (stream.respond_to?(:closed?) && stream.closed?)
      stream.join if join && stream.respond_to?(:join) && ! stream.joined?
    end
  rescue Aborted
    Log.low "Aborted #{message}: #{$!.message}"
    stream.abort($!) if stream.respond_to?(:abort) && ! stream.aborted?
    raise $!
  rescue Exception
    Log.low "Exception #{message}: #{$!.message}"
    stream.abort($!) if stream.respond_to?(:abort) && ! stream.aborted?
    raise $!
  end
end

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



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# File 'lib/scout/concurrent_stream.rb', line 14

def self.setup(stream, options = {}, &block)
  threads, pids, callback, abort_callback, filename, autojoin, lock, no_fail, pair, next_stream = IndiferentHash.process_options options, :threads, :pids, :callback, :abort_callback, :filename, :autojoin, :lock, :no_fail, :pair, :next
  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.std_err = ""

  stream.next = next_stream unless next_stream.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 if filename

  stream.lock = lock unless lock.nil?

  stream.aborted = false

  stream
end

Instance Method Details

#abort(exception = nil) ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 186

def abort(exception = nil)
  self.stream_exception ||= exception
  if @aborted
    Log.medium "Already aborted stream #{Log.fingerprint self} [#{@aborted}]"
    return
  else
    Log.medium "Aborting stream #{Log.fingerprint self} [#{@aborted}]"
  end
  AbortedStream.setup(self, exception)
  @aborted = true
  begin
    @abort_callback.call exception if @abort_callback

    abort_threads(exception)
    abort_pids

    @callback = nil
    @abort_callback = nil

    if @pair && @pair.respond_to?(:abort) && ! @pair.aborted?
      Log.medium "Aborting pair stream #{Log.fingerprint self}: #{Log.fingerprint @pair }"
      @pair.abort exception
    end
  ensure
    close unless closed?

    if lock and lock.locked?
      lock.unlock
    end
  end
end

#abort_pids ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 175

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/scout/concurrent_stream.rb', line 156

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

  threads = @threads.dup
  @threads.clear
  threads.each do |t|
    next if t == Thread.current
    next if t["aborted"]
    t["aborted"] = true
    exception = exception.nil? ? Aborted.new : exception
    Log.debug "Aborting thread #{Log.fingerprint(t)} with exception: #{exception}"
    t.raise(exception)
    t.join
  end
end

#aborted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout/concurrent_stream.rb', line 80

def aborted?
  @aborted
end

#add_callback(&block) ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 256

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/scout/concurrent_stream.rb', line 67

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

#clear ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 72

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

#close(*args) ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 218

def close(*args)
  if autojoin
    begin
      super(*args)
    rescue
      self.abort
      self.join
      stream_raise_exception $!
    ensure
      self.join if ! @stream_exception && (self.closed? || self.eof?)
    end
  else
    begin
      super(*args)
    rescue IOError
    end unless self.closed?
  end
end

#join ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 138

def join
  begin
    join_threads
    join_pids
    raise stream_exception if stream_exception
    join_callback
    close unless closed?
  ensure
    @joined = true
    begin
      lock.unlock if lock && lock.locked?
    rescue
      Log.exception $!
    end
    raise stream_exception if stream_exception
  end
end

#join_callback ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 128

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/scout/concurrent_stream.rb', line 115

def join_pids
  if @pids and @pids.any?
    @pids.each do |pid|
      begin
        Process.waitpid(pid, Process::WUNTRACED)
        stream_raise_exception ConcurrentStreamProcessFailed.new(pid, "Error in waitpid", self) unless $?.success? or no_fail
      rescue Errno::ECHILD
      end
    end
    @pids = []
  end
end

#join_threads ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 84

def join_threads
  if @threads
    @threads.each do |t|
      next if t == Thread.current
      begin
        t.join
        if Process::Status === t.value
          if ! (t.value.success? || no_fail)

            if log
              msg = "Error joining #{self.filename || self.inspect}. Last log line: #{log}"
            else
              msg = "Error joining #{self.filename || self.inspect}"
            end

            raise ConcurrentStreamProcessFailed.new t.pid, msg, self
          end
        end
      rescue Exception
        if no_fail
          Log.low "Not failing on exception joining thread in ConcurrenStream - #{filename} - #{$!.message}"
        else
          Log.low "Exception joining thread in ConcurrenStream #{Log.fingerprint self} - #{Log.fingerprint t} - #{$!.message}"
          stream_raise_exception $!
        end
      end
    end
  end
  @threads = []
end

#joined? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout/concurrent_stream.rb', line 76

def joined?
  @joined
end

#read(*args) ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 237

def read(*args)
  begin
    super(*args)
  rescue Exception
    @stream_exception ||= $!
    raise @stream_exception
  ensure
    if ! @stream_exception && autojoin && ! closed?
      begin
        done = eof?
      rescue Exception
        self.abort($!)
        raise $!
      end
      close if done
    end
  end
end

#stream_raise_exception(exception) ⇒ Object 



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# File 'lib/scout/concurrent_stream.rb', line 264

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