Class: RSMP::Collector

Inherits:
Object
  • Object
show all
Includes:
Reporting, Status, Logging, Receiver
Defined in:
lib/rsmp/collect/collector.rb,
lib/rsmp/collect/collector/status.rb,
lib/rsmp/collect/collector/logging.rb,
lib/rsmp/collect/collector/reporting.rb

Overview

Collects messages from a distributor. Can filter by message type, componet and direction. Wakes up the once the desired number of messages has been collected.

Defined Under Namespace

Modules: Logging, Reporting, Status

Instance Attribute Summary collapse

Attributes included from Logging

#archive, #logger

Instance Method Summary collapse

Methods included from Logging

#author, #initialize_logging, #log

Methods included from Reporting

#describe_matcher, #describe_num_and_type, #describe_progress, #describe_types, #identifier

Methods included from Status

#cancelled?, #collecting?, #ingoing?, #ok?, #outgoing?, #ready?, #timeout?

Methods included from Receiver

#accept_message?, #handle_message, #initialize_receiver, #reject_message?, #start_receiving, #stop_receiving

Methods included from Inspect

#inspector

Constructor Details

#initialize(distributor, options = {}) ⇒ Collector

Returns a new instance of Collector.



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# File 'lib/rsmp/collect/collector.rb', line 13

def initialize(distributor, options = {})
  initialize_receiver distributor, filter: options[:filter]
  @options = {
    cancel: {
      schema_error: true,
      disconnect: false
    }
  }.deep_merge options
  @timeout = options[:timeout]
  @num = options[:num]
  @m_id = options[:m_id]
  @condition = Async::Notification.new
  make_title options[:title]

  if task
    @task = task
  elsif distributor.respond_to? 'task'
    # if distributor is a Proxy, or some other object that implements task(),
    # then try to get the task that way
    @task = distributor.task
  end
  reset
end

Instance Attribute Details

#condition ⇒ Object (readonly)

Returns the value of attribute condition.



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# File 'lib/rsmp/collect/collector.rb', line 11

def condition
  @condition
end

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/rsmp/collect/collector.rb', line 11

def error
  @error
end

#m_id ⇒ Object (readonly)

Returns the value of attribute m_id.



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# File 'lib/rsmp/collect/collector.rb', line 11

def m_id
  @m_id
end

#messages ⇒ Object (readonly)

Returns the value of attribute messages.



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# File 'lib/rsmp/collect/collector.rb', line 11

def messages
  @messages
end

#status ⇒ Object (readonly)

Returns the value of attribute status.



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# File 'lib/rsmp/collect/collector.rb', line 11

def status
  @status
end

#task ⇒ Object (readonly)

Returns the value of attribute task.



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# File 'lib/rsmp/collect/collector.rb', line 11

def task
  @task
end

Instance Method Details

#acceptable?(message) ⇒ Boolean

Check a message against our match criteria Return true if there’s a match, false if not

Returns:

  • (Boolean) 


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# File 'lib/rsmp/collect/collector.rb', line 246

def acceptable?(message)
  @filter.nil? || @filter.accept?(message)
end

#cancel(error = nil) ⇒ Object

Abort collection



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# File 'lib/rsmp/collect/collector.rb', line 233

def cancel(error = nil)
  @error = error
  @status = :cancelled
  do_stop
end

#collect ⇒ Object

Collect message Will return once all messages have been collected, or timeout is reached



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# File 'lib/rsmp/collect/collector.rb', line 72

def collect(&)
  start(&)
  wait
  @status
ensure
  @distributor&.remove_receiver self
end

#collect! ⇒ Object

Collect message Returns the collected messages, or raise an exception in case of a time out.



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# File 'lib/rsmp/collect/collector.rb', line 82

def collect!(&)
  collect(&)
  ok!
  @messages
end

#complete ⇒ Object

Called when we’re done collecting. Remove ourself as a receiver, se we don’t receive message notifications anymore



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# File 'lib/rsmp/collect/collector.rb', line 182

def complete
  @status = :ok
  do_stop
  log_complete
end

#describe ⇒ Object 



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# File 'lib/rsmp/collect/collector.rb', line 158

def describe; end

#do_stop ⇒ Object

Remove ourself as a receiver, so we don’t receive message notifications anymore, and wake up the async condition



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# File 'lib/rsmp/collect/collector.rb', line 195

def do_stop
  @distributor.remove_receiver self
  @condition.signal
end

#done? ⇒ Boolean

Have we collected the required number of messages?

Returns:

  • (Boolean) 


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# File 'lib/rsmp/collect/collector.rb', line 176

def done?
  @num && @messages.size >= @num
end

#incomplete ⇒ Object

called when we received a message, but are not done yet



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# File 'lib/rsmp/collect/collector.rb', line 189

def incomplete
  log_incomplete
end

#inspect ⇒ Object

Inspect formatter that shows the message we have collected



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# File 'lib/rsmp/collect/collector.rb', line 58

def inspect
  "#<#{self.class.name}:#{object_id}, #{inspector(:@messages)}>"
end

#keep(message) ⇒ Object

Store a message in the result array



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# File 'lib/rsmp/collect/collector.rb', line 240

def keep(message)
  @messages << message
end

#make_title(title) ⇒ Object 



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# File 'lib/rsmp/collect/collector.rb', line 37

def make_title(title)
  @title = if title
             title
           elsif @filter
             [@filter.type].flatten.join('/')
           else
             ''
           end
end

#ok! ⇒ Object

if an errors caused collection to abort, then raise it return self, so this can be tucked on to calls that return a collector

Raises:



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# File 'lib/rsmp/collect/collector.rb', line 64

def ok!
  raise @error if @error

  self
end

#perform_match(message) ⇒ Object

Match message against our collection criteria



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# File 'lib/rsmp/collect/collector.rb', line 161

def perform_match(message)
  return false if reject_not_ack(message)
  return false unless acceptable?(message)

  if @block
    status = [@block.call(message)].flatten
    return unless collecting?

    keep message if status.include?(:keep)
  else
    keep message
  end
end

#receive(message) ⇒ Object

Handle message and return true if we’re done collecting

Raises:

  • (ArgumentError) 


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# File 'lib/rsmp/collect/collector.rb', line 142

def receive(message)
  raise ArgumentError unless message
  unless ready? || collecting?
    raise "can't process message when status is :#{@status}, title: #{@title}, desc: #{describe}"
  end

  if perform_match message
    if done?
      complete
    else
      incomplete
    end
  end
  @status
end

#receive_disconnect(error, _options) ⇒ Object

Cancel if we received e notifiction about a disconnect



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# File 'lib/rsmp/collect/collector.rb', line 225

def receive_disconnect(error, _options)
  return unless @options.dig(:cancel, :disconnect)

  @distributor.log "#{identifier}: cancelled due to a connection error: #{error}", level: :debug
  cancel error
end

#receive_error(error, options = {}) ⇒ Object

Handle upstream error



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# File 'lib/rsmp/collect/collector.rb', line 201

def receive_error(error, options = {})
  case error
  when RSMP::SchemaError
    receive_schema_error error, options
  when RSMP::DisconnectError
    receive_disconnect error, options
  end
end

#receive_schema_error(error, options) ⇒ Object

Cancel if we received e schema error for a message type we’re collecting



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# File 'lib/rsmp/collect/collector.rb', line 211

def receive_schema_error(error, options)
  return unless @options.dig(:cancel, :schema_error)

  message = options[:message]
  return unless message

  klass = message.class.name.split('::').last
  return unless @filter&.type.nil? || [@filter&.type].flatten.include?(klass)

  @distributor.log "#{identifier}: cancelled due to schema error in #{klass} #{message.m_id_short}", level: :debug
  cancel error
end

#reject_not_ack(message) ⇒ Object

Check if we receive a NotAck related to initiating request, identified by @m_id.



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# File 'lib/rsmp/collect/collector.rb', line 129

def reject_not_ack(message)
  return unless @m_id

  return unless message.is_a?(MessageNotAck)
  return unless message.attribute('oMId') == @m_id

  m_id_short = RSMP::Message.shorten_m_id @m_id, 8
  cancel RSMP::MessageRejected.new("#{@title} #{m_id_short} was rejected with '#{message.attribute('rea')}'")
  @distributor.log "#{identifier}: cancelled due to a NotAck", level: :debug
  true
end

#reset ⇒ Object 



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# File 'lib/rsmp/collect/collector.rb', line 51

def reset
  @messages = []
  @error = nil
  @status = :ready
end

#start(&block) ⇒ Object

Start collection and return immediately You can later use wait() to wait for completion

Raises:

  • (ArgumentError) 


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# File 'lib/rsmp/collect/collector.rb', line 116

def start(&block)
  raise "Can't start collectimng unless ready (currently #{@status})" unless ready?

  @block = block
  raise ArgumentError, 'Num, timeout or block must be provided' unless @num || @timeout || @block

  reset
  @status = :collecting
  log_start
  @distributor&.add_receiver self
end

#use_task(task) ⇒ Object 



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# File 'lib/rsmp/collect/collector.rb', line 47

def use_task(task)
  @task = task
end

#wait ⇒ Object

If collection is not active, return status immeditatly. Otherwise wait until the desired messages have been collected, or timeout is reached.



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# File 'lib/rsmp/collect/collector.rb', line 90

def wait
  if collecting?
    if @timeout
      @task.with_timeout(@timeout) { @condition.wait }
    else
      @condition.wait
    end
  end
  @status
rescue Async::TimeoutError
  @error = RSMP::TimeoutError.new describe_progress
  @status = :timeout
end

#wait! ⇒ Object

If collection is not active, raise an error. Otherwise wait until the desired messages have been collected. If timeout is reached, an exceptioin is raised.

Raises:



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# File 'lib/rsmp/collect/collector.rb', line 107

def wait!
  wait
  raise @error if timeout?

  @messages
end