Module: Libis::Workflow::Base::WorkItem

Includes:
Enumerable, Logging, Status
Included in:
WorkItem
Defined in:
lib/libis/workflow/base/work_item.rb

Overview

Base module for all work items.

This module lacks the implementation for the data attributes. It functions as an interface that describes the common functionality regardless of the storage implementation. These attributes require some implementation:

  • parent: [Object|nil] a link to a parent work item. Work items can be organized in any hierarchy you think is

    relevant for your workflow (e.g. directory[/directory...]/file/line or library/section/book/page). Of course
hierarchies are not mandatory.

  • items: [Array] a list of child work items. see above.

  • options: [Hash] a set of options for the task chain on how to deal with this work item. This attribute can be

    used to fine-tune the behaviour of tasks for a particular work item.

  • properties: [Hash] a set of properties, typically collected during the workflow processing and used to store

    final or intermediate resulst of tasks. The ::Lias::Ingester::FileItem module uses this attribute to store the
properties (e.g. size, checksum, ...) of the file it represents.

  • status_log: [Array] a list of all status changes the work item went through.

  • summary: [Hash] collected statistics about the ingest for the work item and its children. This structure will

    be filled in by the included task ::Lias::Ingester::Tasks::Analyzer wich is appended to the workflow by default.

The module is created so that it is possible to implement an ActiveRecord/Datamapper/… implementation easily. A simple in-memory implementation would require:

attr_accessor :parent attr_accessor :items attr_accessor :options, :properties attr_accessor :status_log attr_accessor :summary

def initialize

self.parent = nil
self.items = []
self.options = {}
self.properties = {}
self.status_log = []
self.summary = {}

end

protected

## Method below should be adapted to match the implementation of the status array

def add_status_log(info)

self.status_log << info

end

The implementation should also take care that the public methods #save and #save! are implemented. ActiveRecord and Mongoid are known to implement these, but others may not.

Instance Method Summary collapse

Methods included from Logging

#<=, #add_log, #log_message

Methods included from Status

#check_status, #compare_status, #set_status, #status, #status_label, #status_progress, #status_text

Instance Method Details

#add_item(item) ⇒ Object Also known as: <<

Add a child work item

Parameters:

  • item (WorkItem) —

    to be added to the child list :items



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# File 'lib/libis/workflow/base/work_item.rb', line 133

def add_item(item)
  return self unless item and item.is_a?(Libis::Workflow::Base::WorkItem)
  self.items << item
  item.parent = self
  # noinspection RubyResolve
  self.save!
  # noinspection RubyResolve
  item.save!
  self
end

#each(&block) ⇒ Object

Iterates over the work item clients and invokes code on each of them.



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# File 'lib/libis/workflow/base/work_item.rb', line 120

def each(&block)
  self.items.each(&block)
end

#get_item_list ⇒ Object

Get list of items.

This method should return a list of items that is safe to iterate over while it is being altered.



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# File 'lib/libis/workflow/base/work_item.rb', line 156

def get_item_list
  self.items.dup
end

#get_items ⇒ Object

Get list of items.

This method should return a list of items that can be accessed during long processing times.



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# File 'lib/libis/workflow/base/work_item.rb', line 149

def get_items
  self.items
end

#get_parent ⇒ Libis::Workflow::Base::WorkItem

Return item’s parent

Returns:



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# File 'lib/libis/workflow/base/work_item.rb', line 162

def get_parent
  self.parent
end

#get_root ⇒ Libis::Workflow::Base::WorkItem

go up the hierarchy and return the topmost work item

Returns:



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# File 'lib/libis/workflow/base/work_item.rb', line 169

def get_root
  self.get_parent && self.get_parent.is_a?(Libis::Workflow::Base::WorkItem) && self.get_parent.get_root || self
end

#get_run ⇒ Libis::Workflow::Base::Run

Get the top

Returns:



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# File 'lib/libis/workflow/base/work_item.rb', line 176

def get_run
  return self if self.is_a?(Libis::Workflow::Base::Run)
  self.get_parent&.get_run
end

#label ⇒ Object

Label is a more descriptive name



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# File 'lib/libis/workflow/base/work_item.rb', line 92

def label
  self.properties['label'] || self.name
end

#label=(value) ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 96

def label=(value)
  self.properties['label'] = value
end

#labelpath ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 104

def labelpath;
  self.labels.join('/');
end

#labels ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 100

def labels
  (self.parent.labels rescue Array.new).push(label).compact
end

#name ⇒ String

String representation of the identity of the work item.

You may want to overwrite this method as it tries the :name property or whatever #inspect returns if that failes. Typically this should return the key value, file name or id number. If that’s what your :name property contains, you’re fine.

Returns:

  • (String) —

    string identification for this work item.



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# File 'lib/libis/workflow/base/work_item.rb', line 70

def name
  # noinspection RubyResolve
  self.properties['name'] || self.inspect
end

#name=(n) ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 75

def name=(n)
  self.properties['name'] = n
end

#namepath ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 87

def namepath;
  self.names.join('/');
end

#names ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 83

def names
  (self.parent.names rescue Array.new).push(name).compact
end

#size ⇒ Object Also known as: count 



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# File 'lib/libis/workflow/base/work_item.rb', line 124

def size
  self.items.size
end

#to_filename ⇒ String

File name safe version of the to_s output.

The output should be safe to use as a file name to store work item data. Typical use is when extra file items are created by a task and need to be stored on disk. The default implementation URL-encodes (%xx) all characters except alphanumeric, ‘.’ and ‘-’.

Returns:

  • (String) —

    file name



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# File 'lib/libis/workflow/base/work_item.rb', line 115

def to_filename
  self.to_s.gsub(/[^\w.-]/) { |s| '%%%02x' % s.ord }
end

#to_s ⇒ Object 



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# File 'lib/libis/workflow/base/work_item.rb', line 79

def to_s;
  self.name;
end