Class: FSEvent::WatchSet

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/fsevent/watchset.rb

Overview

watchset.rb — set of watches

Copyright © 2014 National Institute of Advanced Industrial Science and Technology (AIST)

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <www.gnu.org/licenses/>.

Instance Method Summary collapse

Methods included from Util

nested_hash, nonempty_hash, prefixpat_match, reaction_immediate_at_beginning?, reaction_immediate_at_subsequent?, valid_device_name_for_read?, valid_device_name_for_write?, valid_device_name_pat_for_read?, valid_status_name_for_read?, valid_status_name_for_write?, valid_status_name_pat_for_read?

Constructor Details

#initialize ⇒ WatchSet

Returns a new instance of WatchSet.



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# File 'lib/fsevent/watchset.rb', line 21

def initialize
  # valid values of reaction: :immediate, :schedule
  @watch_defs = nested_hash(3) # watcher_device_name -> watchee_device_name_pat -> status_name_pat -> reaction

  @watch_exact_exact = nested_hash(3) # watchee_device_name_exact -> status_name_exact -> watcher_device_name -> reaction
  @watch_exact_prefix = nested_hash(3) # watchee_device_name_exact -> status_name_prefix -> watcher_device_name -> reaction
  @watch_prefix_exact = nested_hash(3) # watchee_device_name_prefix -> status_name_exact -> watcher_device_name -> reaction
  @watch_prefix_prefix = nested_hash(3) # watchee_device_name_prefix -> status_name_prefix -> watcher_device_name -> reaction
end

Instance Method Details

#add(watchee_device_name_pat, status_name_pat, watcher_device_name, reaction) ⇒ Object 



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# File 'lib/fsevent/watchset.rb', line 31

def add(watchee_device_name_pat, status_name_pat, watcher_device_name, reaction)
  @watch_defs[watcher_device_name][watchee_device_name_pat][status_name_pat] = reaction
  if /\*\z/ =~ watchee_device_name_pat
    watchee_device_name_prefix = $`
    if /\*\z/ =~ status_name_pat
      status_name_prefix = $`
      @watch_prefix_prefix[watchee_device_name_prefix][status_name_prefix][watcher_device_name] = reaction
    else
      @watch_prefix_exact[watchee_device_name_prefix][status_name_pat][watcher_device_name] = reaction
    end
  else
    if /\*\z/ =~ status_name_pat
      status_name_prefix = $`
      @watch_exact_prefix[watchee_device_name_pat][status_name_prefix][watcher_device_name] = reaction
    else
      @watch_exact_exact[watchee_device_name_pat][status_name_pat][watcher_device_name] = reaction
    end
  end
end

#del(watchee_device_name_pat, status_name_pat, watcher_device_name) ⇒ Object 



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# File 'lib/fsevent/watchset.rb', line 51

def del(watchee_device_name_pat, status_name_pat, watcher_device_name)
  @watch_defs[watcher_device_name][watchee_device_name_pat].delete status_name_pat
  if /\*\z/ =~ watchee_device_name_pat
    watchee_device_name_prefix = $`
    if /\*\z/ =~ status_name_pat
      status_name_prefix = $`
      @watch_prefix_prefix[watchee_device_name_prefix][status_name_prefix].delete watcher_device_name
    else
      @watch_prefix_exact[watchee_device_name_prefix][status_name_pat].delete watcher_device_name
    end
  else
    if /\*\z/ =~ status_name_pat
      status_name_prefix = $`
      @watch_exact_prefix[watchee_device_name_pat][status_name_prefix].delete watcher_device_name
    else
      @watch_exact_exact[watchee_device_name_pat][status_name_pat].delete watcher_device_name
    end
  end
end

#delete_watcher(watcher_device_name) ⇒ Object 



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# File 'lib/fsevent/watchset.rb', line 119

def delete_watcher(watcher_device_name)
  @watch_defs.delete watcher_device_name

  [@watch_exact_exact,
   @watch_exact_prefix,
   @watch_prefix_exact,
   @watch_prefix_prefix].each {|h0|
    h0.each {|watchee_device_name, h1|
      h1.each {|status_name, h2|
        h2.delete watcher_device_name
      }
    }
  }
end

#lookup_watchers(watchee_device_name, status_name) ⇒ Object 



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# File 'lib/fsevent/watchset.rb', line 71

def lookup_watchers(watchee_device_name, status_name)
  # needs cache for performance?
  result = []
  if @watch_exact_exact.has_key?(watchee_device_name) &&
     @watch_exact_exact[watchee_device_name].has_key?(status_name)
    @watch_exact_exact[watchee_device_name][status_name].each {|watcher_device_name, reaction|
      result << [watcher_device_name, reaction]
    }
  end
  if @watch_exact_prefix.has_key?(watchee_device_name)
    @watch_exact_prefix[watchee_device_name].each {|status_name_prefix, h| # linear search.  can be slow.  binary search is better.
      if status_name.start_with? status_name_prefix
        h.each {|watcher_device_name, reaction|
          result << [watcher_device_name, reaction]
        }
      end
    }
  end
  @watch_prefix_exact.each {|watchee_device_name_prefix, h1| # linear search.  can be slow.  binary search is better.
    next unless watchee_device_name.start_with? watchee_device_name_prefix
    if @watch_prefix_exact[watchee_device_name_prefix].has_key?(status_name)
      @watch_prefix_exact[watchee_device_name_prefix][status_name].each {|watcher_device_name, reaction|
        result << [watcher_device_name, reaction]
      }
    end
  }
  @watch_prefix_prefix.each {|watchee_device_name_prefix, h1| # linear search.  can be slow.  binary search is better.
    next unless watchee_device_name.start_with? watchee_device_name_prefix
    @watch_prefix_prefix[watchee_device_name_prefix].each {|status_name_prefix, h| # linear search.  can be slow.  binary search is better.
      if status_name.start_with? status_name_prefix
        h.each {|watcher_device_name, reaction|
          result << [watcher_device_name, reaction]
        }
      end
    }
  }
  result
end

#watcher_each(watcher_device_name) ⇒ Object 



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# File 'lib/fsevent/watchset.rb', line 110

def watcher_each(watcher_device_name)
  return unless @watch_defs.has_key? watcher_device_name
  @watch_defs[watcher_device_name].each {|watchee_device_name_pat, h|
    h.each {|status_name_pat, reaction|
      yield watchee_device_name_pat, status_name_pat, reaction
    }
  }
end