Class: BiblioTech::Backups::Scheduler

Inherits:
Object
  • Object
show all
Defined in:
lib/bibliotech/backups/scheduler.rb

Direct Known Subclasses

CalendarScheduler

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, frequency, limit) ⇒ Scheduler

Returns a new instance of Scheduler.



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# File 'lib/bibliotech/backups/scheduler.rb', line 8

def initialize(name, frequency, limit)
  @name = name
  @frequency, @limit = frequency, limit
  @limit = nil if limit == "all"
end

Instance Attribute Details

#frequency ⇒ Object

Returns the value of attribute frequency.



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# File 'lib/bibliotech/backups/scheduler.rb', line 6

def frequency
  @frequency
end

#limit ⇒ Object

Returns the value of attribute limit.



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# File 'lib/bibliotech/backups/scheduler.rb', line 6

def limit
  @limit
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/bibliotech/backups/scheduler.rb', line 6

def name
  @name
end

Instance Method Details

#compute_earliest_time(file_list) ⇒ Object

The earliest possible time to keep a file in.



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# File 'lib/bibliotech/backups/scheduler.rb', line 23

def compute_earliest_time(file_list)
  limit_time = Time.at(0)
  return limit_time if file_list.empty?
  unless limit.nil?
    limit_time = latest_time(file_list) - limit * freq_seconds
  end
  [limit_time, file_list.last.timestamp - range].max
end

#freq_seconds ⇒ Object 



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# File 'lib/bibliotech/backups/scheduler.rb', line 14

def freq_seconds
  frequency * 60
end

#latest_time(file_list) ⇒ Object

The latest possible time to keep a file in.



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# File 'lib/bibliotech/backups/scheduler.rb', line 33

def latest_time(file_list)
  return Time.at(0) if file_list.empty?
  file_list.first.timestamp
end

#mark(original_file_list) ⇒ Object

Working from the latest time backwards, mark the closest file to the appropriate frequencies as keepable



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# File 'lib/bibliotech/backups/scheduler.rb', line 48

def mark(original_file_list)
  file_list = original_file_list.sort_by{|record| -record.timestamp.to_i} #sort from newest to oldest

  time = latest_time(file_list)
  earliest_time = compute_earliest_time(file_list)
  oldest_file = file_list.last

  while time > earliest_time do
    file_list.delete_if do |record|
      record.timestamp > time
    end

    if file_list.empty?
      oldest_file.in_schedule(name)
      break
    end

    closest = file_list.first

    if (time - closest.timestamp) < freq_seconds
      closest.in_schedule(name)
    end
    time = step_back(time)
  end
  return original_file_list
end

#range ⇒ Object 



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# File 'lib/bibliotech/backups/scheduler.rb', line 18

def range
  freq_seconds / 2
end

#step_back(time) ⇒ Object 



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# File 'lib/bibliotech/backups/scheduler.rb', line 38

def step_back(time)
  time - freq_seconds
end

#step_forward(time) ⇒ Object 



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# File 'lib/bibliotech/backups/scheduler.rb', line 42

def step_forward(time)
  time + freq_seconds
end