Class: OMF::OML::OmlNetwork

Inherits:
Base::LObject
  • Object
show all
Includes:
MonitorMixin
Defined in:
lib/omf_oml/network.rb

Overview

This class represents a network consisting of nodes and links with their respective attributes.

Constant Summary collapse

@@name2network = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name = nil, attributes = {}) ⇒ OmlNetwork

name - Name of table opts -



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# File 'lib/omf_oml/network.rb', line 45

def initialize(name = nil, attributes = {})
  super name
  @name = name || "nw_#{object_id}"
  @attributes = attributes
  @nodes = {}
  @name2node = {}
  @links = {}
  @name2link = {}
  @epoch = 0 # increment whenever an element is being updated
  @updateListeners = {}
  if name
    synchronize do
      if @@name2network[name]
        raise OmlNetworkAlreadyExistException.new(name)
      end
      @@name2network[name] = self
    end
  end
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/omf_oml/network.rb', line 39

def name
  @name
end

Class Method Details

.[](name) ⇒ Object

Return a named network



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# File 'lib/omf_oml/network.rb', line 35

def self.[](name)
  @@name2network[name]
end

Instance Method Details

opts

:from - fromNode if +fromNode+ is nil
:to - toNode if +toNode+ is nil
...  - rest of options passed on to +NetworkLink+ constructor



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# File 'lib/omf_oml/network.rb', line 133

def create_link(name = nil, fromNode = nil, toNode = nil, attributes = {})
  name = name.to_sym if name
  fromNode = attributes.delete(:from) unless fromNode
  toNode = attributes.delete(:to) unless toNode

  synchronize do
    if name && @name2link[name]
      raise OmlLinkAlreadyExistException.new(name)
    end
    if fromNode
      fromNode = node(fromNode) || (raise UnknownOmlNodeException.new(fromNode))
    end
    if toNode
      toNode = node(toNode) || (raise UnknownOmlNodeException.new(toNode))
    end
    link = NetworkLink.new(name, fromNode, toNode, attributes, self)
    @links[link.el_id] = link
    @name2link[name] = link if name
    link
  end
end

#create_node(name = nil, attributes = {}) ⇒ Object

NOTE: May need a monitor if used in multi-threaded environments



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# File 'lib/omf_oml/network.rb', line 114

def create_node(name = nil, attributes = {})
  name = name.to_sym if name
  synchronize do
    if name && @name2node[name]
      raise OmlNodeAlreadyExistException.new(name)
    end
    node = NetworkNode.new(name, attributes, self)
    @nodes[node.el_id] = node
    @name2node[name] = node if name
    node
  end
end

#describe ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 196

def describe
  nh = {}
  @nodes.each do |id, node| nh[id] = node.describe end
  lh = {}
  @links.each do |id, link| lh[id] = link.describe end
  {:nodes => nh, :links => lh}
end

#link(name, new_opts = nil) ⇒ Object

Return the link named name. If the link doesn’t exist and new_opts is a Hash, create a new one and return that.



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# File 'lib/omf_oml/network.rb', line 88

def link(name, new_opts = nil)
  return name if name.kind_of? NetworkLink
  link = @name2link[name.to_sym]
  if link.nil? && !new_opts.nil?
    link = create_link(name, nil, nil, new_opts)
  end
  link
end

#link_schema(schema = nil) ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 184

def link_schema(schema = nil)
  if schema
    @link_schema = OmlSchema.create(schema)
    @link_schema.insert_column_at(0, :id)
    @link_schema.insert_column_at(1, :name)
    @link_schema.insert_column_at(2, :from_id)
    @link_schema.insert_column_at(3, :to_id)
  end
  @link_schema
end

#links ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 81

def links()
  @links.values
end

#node(name, new_opts = nil) ⇒ Object

Return the node named name. If the node doesn’t exist and new_opts is a Hash, create a new one and return that.



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# File 'lib/omf_oml/network.rb', line 72

def node(name, new_opts = nil)
  return name if name.kind_of? NetworkNode
  node = @name2node[name.to_sym]
  if node.nil? && !new_opts.nil?
    node = create_node(name, new_opts)
  end
  node
end

#node_schema(schema = nil) ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 175

def node_schema(schema = nil)
  if schema
    @node_schema = OmlSchema.create(schema)
    @node_schema.insert_column_at(0, :id)
    @node_schema.insert_column_at(1, :name)
  end
  @node_schema
end

#nodes ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 65

def nodes()
  @nodes.values
end

#on_update(name = :_, &callback) ⇒ Object

Register a callback to be called every time network elements change The callback is provided with an arrach of changed elements.



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# File 'lib/omf_oml/network.rb', line 101

def on_update(name = :_, &callback)
  if (callback)
    if @updateListeners[name]
      throw SameNameOnUpdateException.new(name)
    end
    @updateListeners[name] = callback
  else
    @updateListeners.delete(name)
  end
end

#to_json ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 292

def to_json
  describe.to_json
end

#to_table(aspect, table_opts = {}) ⇒ Object

Create a table to track an aspect of this network.

aspect - Either :nodes or :links



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# File 'lib/omf_oml/network.rb', line 235

def to_table(aspect, table_opts = {})
  aspect = aspect.to_sym
  case aspect
  when :nodes
    table = OmlTable.create @name + '/nodes', @node_schema, table_opts
    #puts "TABLE SCHEME >>>> #{table.schema}"
    table.add_rows(@nodes.map do |id, n|
      @node_schema.hash_to_row(n.attributes)
    end)
    on_update "__to_tables_nodes_#{table.object_id}" do |a|
      nodes = a.map do |e|
        e.kind_of?(NetworkNode) ? @node_schema.hash_to_row(e.attributes) : nil
      end.compact
      table.add_rows(nodes) unless nodes.empty?
    end

  when :links
    table = OmlTable.create @name + '/links', @link_schema, table_opts
    # @links.each do |id, l|
      # table.add_row @link_schema.hash_to_row(l.attributes)
    # end
    table.add_rows(@links.map do |id, n|
      # puts @link_schema.hash_to_row(n.attributes).inspect
      # puts table.schema
      # table.add_row @link_schema.hash_to_row(n.attributes)
      # puts table.rows.inspect
      # exit

      @link_schema.hash_to_row(n.attributes)
    end)
    #puts table.rows.inspect
    on_update "__to_tables_links_#{table.object_id}" do |a|
      links = a.map do |e|
        e.kind_of?(NetworkLink) ? @link_schema.hash_to_row(e.attributes) : nil
      end.compact
      table.add_rows(links) unless links.empty?
    end

  else
    raise "Unknown aspect '#{aspect}'. Should be either 'nodes' or 'links'."
  end

  # on_update "__to_tables_#{table.object_id}" do |a|
    # a.each do |e|
      # if aspect == :nodes && e.kind_of?(NetworkNode)
        # table.add_row @node_schema.hash_to_row(e.attributes)
      # end
      # if aspect == :links && e.kind_of?(NetworkLink)
        # table.add_row @link_schema.hash_to_row(e.attributes)
      # end
    # end
  # end

  table
end

#transaction(&block) ⇒ Object

To have the update listeners only called once when multiple elements are changed at once, perform the changes within a transaction block. The listeners are then called once with an array containing all updated elements.



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# File 'lib/omf_oml/network.rb', line 159

def transaction(&block)
  updated = UpdateSet.new
  synchronize do
    @updated = updated

    @in_transaction = true
    block.call
    @in_transaction = true
  end
  unless updated.empty?
    @updateListeners.values.each do |l|
      l.call(updated)
    end
  end
end

#updated(element) ⇒ Object 



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# File 'lib/omf_oml/network.rb', line 298

def updated(element)
  synchronize do
    if @in_transaction
      @updated << element
      return
    end
  end
  uset = UpdateSet.new
  uset << element
  @updateListeners.each do |l|
    l.call(uset)
  end
end