123456789_123456789_123456789_123456789_123456789_

Module: Concurrent::MutableStruct

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
Defined in: lib/concurrent-ruby/concurrent/mutable_struct.rb

Overview

An thread-safe variation of Ruby’s standard Struct. Values can be set at construction or safely changed at any time during the object’s lifecycle.

Constant Summary

Class Method Summary

Instance Method Summary

Synchronization::AbstractStruct - Included

#length

Returns the number of struct members.

#members

Returns the struct members as an array of symbols.

#size
#initialize,
#ns_each

Yields the value of each struct member in order.

#ns_each_pair

Yields the name and value of each struct member in order.

#ns_equality

Equality.

#ns_get

Attribute Reference.

#ns_initialize_copy,
#ns_inspect

Describe the contents of this struct in a string.

#ns_merge

Returns a new struct containing the contents of other and the contents of self.

#ns_select

Yields each member value from the struct to the block and returns an Array containing the member values from the struct for which the given block returns a true value (equivalent to Enumerable#select).

#ns_to_h

Returns a hash containing the names and values for the struct’s members.

#ns_values

Returns the values for this struct as an Array.

#ns_values_at

Returns the struct member values for each selector as an Array.

#pr_underscore

Class Method Details

.new(*args, &block) (private)

Factory for creating new struct classes.

“‘ new( [, member_name]+>) -> StructClass click to toggle source new( [, member_name]+>) {|StructClass| block } -> StructClass new(value, …) -> obj StructClass[value, …] -> obj “`

The first two forms are used to create a new struct subclass class_name that can contain a value for each member_name . This subclass can be used to create instances of the structure like any other Class .

If the class_name is omitted an anonymous struct class will be created. Otherwise, the name of this struct will appear as a constant in the struct class, so it must be unique for all structs under this base class and must start with a capital letter. Assigning a struct class to a constant also gives the class the name of the constant.

If a block is given it will be evaluated in the context of StructClass, passing the created class as a parameter. This is the recommended way to customize a struct. Subclassing an anonymous struct creates an extra anonymous class that will never be used.

The last two forms create a new instance of a struct subclass. The number of value parameters must be less than or equal to the number of attributes defined for the struct. Unset parameters default to nil. Passing more parameters than number of attributes will raise an ArgumentError.

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 210

def self.new(*args, &block)
  clazz_name = nil
  if args.length == 0
    raise ArgumentError.new('wrong number of arguments (0 for 1+)')
  elsif args.length > 0 && args.first.is_a?(String)
    clazz_name = args.shift
  end
  FACTORY.define_struct(clazz_name, args, &block)
end

Instance Method Details

#==(other) ⇒ Boolean

Equality

Returns:

  • (Boolean)

    true if other has the same struct subclass and has equal member values (according to Object#==)

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 128

def ==(other)
  synchronize { ns_equality(other) }
end

#[](member) ⇒ Object

Attribute Reference

Parameters:

  • member (Symbol, String, Integer)

    the string or symbol name of the member for which to obtain the value or the member’s index

Returns:

  • (Object)

    the value of the given struct member or the member at the given index.

Raises:

  • (NameError)

    if the member does not exist

  • (IndexError)

    if the index is out of range.

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 118

def [](member)
  synchronize { ns_get(member) }
end

#[]=(member, value) ⇒ Object

Attribute Assignment

Sets the value of the given struct member or the member at the given index.

Parameters:

  • member (Symbol, String, Integer)

    the string or symbol name of the member for which to obtain the value or the member’s index

Returns:

  • (Object)

    the value of the given struct member or the member at the given index.

Raises:

  • (NameError)

    if the name does not exist

  • (IndexError)

    if the index is out of range.

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 185

def []=(member, value)
  if member.is_a? Integer
    length = synchronize { @values.length }
    if member >= length
      raise IndexError.new("offset #{member} too large for struct(size:#{length})")
    end
    synchronize { @values[member] = value }
  else
    send("#{member}=", value)
  end
rescue NoMethodError
  raise NameError.new("no member '#{member}' in struct")
end

#each {|value| ... }

Yields the value of each struct member in order. If no block is given an enumerator is returned.

Yields:

  • the operation to be performed on each struct member

Yield Parameters:

  • value (Object)

    each struct value (in order)

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 139

def each(&block)
  return enum_for(:each) unless block_given?
  synchronize { ns_each(&block) }
end

#each_pair {|member, value| ... }

Yields the name and value of each struct member in order. If no block is given an enumerator is returned.

Yields:

  • the operation to be performed on each struct member/value pair

Yield Parameters:

  • member (Object)

    each struct member (in order)

  • value (Object)

    each struct value (in order)

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 152

def each_pair(&block)
  return enum_for(:each_pair) unless block_given?
  synchronize { ns_each_pair(&block) }
end

#initialize_copy(original) (private)

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 202

def initialize_copy(original)
  synchronize do
    super(original)
    ns_initialize_copy
  end
end

#inspectString Also known as: #to_s

Describe the contents of this struct in a string.

Returns:

  • (String)

    the contents of this struct in a string

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 72

def inspect
  synchronize { ns_inspect }
end

#merge(other) {|member, selfvalue, othervalue| ... } ⇒ Synchronization::AbstractStruct

Returns a new struct containing the contents of other and the contents of self. If no block is specified, the value for entries with duplicate keys will be that of other. Otherwise the value for each duplicate key is determined by calling the block with the key, its value in self and its value in other.

Parameters:

  • other (Hash)

    the hash from which to set the new values

Yields:

  • an options block for resolving duplicate keys

Yield Parameters:

  • member (String, Symbol)

    the name of the member which is duplicated

  • selfvalue (Object)

    the value of the member in self

  • othervalue (Object)

    the value of the member in other

Returns:

Raises:

  • (ArgumentError)

    of given a member that is not defined in the struct

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 94

def merge(other, &block)
  synchronize { ns_merge(other, &block) }
end

#select {|value| ... } ⇒ Array

Yields each member value from the struct to the block and returns an Array containing the member values from the struct for which the given block returns a true value (equivalent to Enumerable#select).

Yields:

  • the operation to be performed on each struct member

Yield Parameters:

  • value (Object)

    each struct value (in order)

Returns:

  • (Array)

    an array containing each value for which the block returns true

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 167

def select(&block)
  return enum_for(:select) unless block_given?
  synchronize { ns_select(&block) }
end

#to_a

Alias for #values.

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 54

alias_method :to_a, :values

#to_hHash

Returns a hash containing the names and values for the struct’s members.

Returns:

  • (Hash)

    the names and values for the struct’s members

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 103

def to_h
  synchronize { ns_to_h }
end

#to_s

Alias for #inspect.

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 75

alias_method :to_s, :inspect

#valuesArray Also known as: #to_a

Returns the values for this struct as an Array.

Returns:

  • (Array)

    the values for this struct

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 51

def values
  synchronize { ns_values }
end

#values_at(*indexes)

Returns the struct member values for each selector as an Array.

A selector may be either an Integer offset or a Range of offsets (as in Array#values_at).

Parameters:

  • indexes (Fixnum, Range)

    the index(es) from which to obatin the values (in order)

[ GitHub ]

  
# File 'lib/concurrent-ruby/concurrent/mutable_struct.rb', line 63

def values_at(*indexes)
  synchronize { ns_values_at(indexes) }
end