Class: FileMonitoring::DirStat

Inherits:
FileStat
  • Object
show all
Defined in:
lib/file_monitoring/monitor_path.rb

Overview

This class holds current state of directory and methods to control changes

Constant Summary

Constants inherited from FileStat

FileStat::DEFAULT_STABLE_STATE

Instance Attribute Summary

Attributes inherited from FileStat

#cycles, #modification_time, #path, #size, #stable_state, #state

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from FileStat

#==, #changed?, #set_event_queue, set_log, #set_output_queue

Constructor Details

#initialize(path, stable_state = DEFAULT_STABLE_STATE) ⇒ DirStat

Initializes new directory monitoring object

Arguments:

  • path - File location

  • stable_state - Number of iterations to move unchanged directory to stable state



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# File 'lib/file_monitoring/monitor_path.rb', line 147

def initialize(path, stable_state = DEFAULT_STABLE_STATE)
  ObjectSpace.define_finalizer(self,
                               self.class.method(:finalize).to_proc)
  if Params['enable_monitoring']
    Params['process_vars'].inc('obj add DirStat')
  end
  super
  @dirs = nil
  @files = nil
  @non_utf8_paths = {}
  ObjectSpace.define_finalizer(self,
                               self.class.method(:finalize).to_proc)
end

Class Method Details

.finalize(id) ⇒ Object 



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# File 'lib/file_monitoring/monitor_path.rb', line 161

def self.finalize(id)
  if Params['enable_monitoring']
    Params['process_vars'].inc('obj rem DirStat')
  end
end

Instance Method Details

#has_dir?(path) ⇒ Boolean

Checks that there is a sub-folder with a given path.

Returns:

  • (Boolean) 


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# File 'lib/file_monitoring/monitor_path.rb', line 188

def has_dir?(path)
  @dirs.has_key?(path)
end

#has_file?(path) ⇒ Boolean

Checks that there is a file with a given path.

Returns:

  • (Boolean) 


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# File 'lib/file_monitoring/monitor_path.rb', line 193

def has_file?(path)
  @files.has_key?(path)
end

#monitor ⇒ Object

Checks that directory structure (i.e. files and directories located directly under this directory) wasn’t changed since the last iteration.



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# File 'lib/file_monitoring/monitor_path.rb', line 213

def monitor
  was_changed = false
  new_state = nil
  self_stat = File.lstat(@path) rescue nil
  if self_stat == nil
    new_state = FileStatEnum::NON_EXISTING
    @files = nil
    @dirs = nil
    @cycles = 0
  elsif @files == nil
    new_state = FileStatEnum::NEW
    @files = Hash.new
    @dirs = Hash.new
    @cycles = 0
    update_dir
  elsif update_dir
    new_state = FileStatEnum::CHANGED
    @cycles = 0
  else
    new_state = FileStatEnum::UNCHANGED
    @cycles += 1
    if @cycles >= @stable_state
      new_state = FileStatEnum::STABLE
    end
  end

  # The assignment
  self.state= new_state
end

#to_s(indent = 0) ⇒ Object

Returns string which contains path and state of this directory as well as it’s structure.



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# File 'lib/file_monitoring/monitor_path.rb', line 198

def to_s(indent = 0)
  indent_increment = 2
  child_indent = indent + indent_increment
  res = super
  @files.each_value do |file|
    res += "\n" + file.to_s(child_indent)
  end if @files
  @dirs.each_value do |dir|
    res += "\n" + dir.to_s(child_indent)
  end if @dirs
  res
end