Class: Hold::File::HashRepository

Inherits:
Object
  • Object
show all
Includes:
HashRepository
Defined in:
lib/hold/file/hash_repository.rb

Overview

A simple HashRepository (ie key/value store implementation) which stores each key in a separate file.

  • Keys must be suitable pathnames

  • Values must be strings

  • base_path should end with a /, or keys should start with a /, one or the other

  • subdirectories will be created as required if the keys contain path separators

  • watch out for per-directory file limits.

NB: Not threadsafe for writes

Instance Method Summary collapse

Methods included from HashRepository

#get_many_with_keys, #key_cell

Constructor Details

#initialize(base_path) ⇒ HashRepository

Returns a new instance of HashRepository.



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# File 'lib/hold/file/hash_repository.rb', line 29

def initialize(base_path)
  @base_path = base_path
end

Instance Method Details

#can_get_class?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hold/file/hash_repository.rb', line 21

def can_get_class?(klass)
  klass == String
end

#can_set_class?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hold/file/hash_repository.rb', line 25

def can_set_class?(klass)
  klass == String
end

#clear_key(key) ⇒ Object 



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# File 'lib/hold/file/hash_repository.rb', line 52

def clear_key(key)
  path = path_to_key(key)
  begin
    ::File.unlink(path)
  rescue Errno::ENOENT
  end
end

#get_with_key(key) ⇒ Object 



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# File 'lib/hold/file/hash_repository.rb', line 44

def get_with_key(key)
  path = path_to_key(key)
  begin
    ::File.read(path)
  rescue Errno::ENOENT
  end
end

#key?(key) ⇒ Boolean Also known as: has_key?

Returns:

  • (Boolean) 


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# File 'lib/hold/file/hash_repository.rb', line 60

def key?(key)
  ::File.exist?(path_to_key(key))
end

#path_to_key(key) ⇒ Object 



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# File 'lib/hold/file/hash_repository.rb', line 33

def path_to_key(key)
  "#{@base_path}#{key}"
end

#set_with_key(key, value) ⇒ Object 



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# File 'lib/hold/file/hash_repository.rb', line 37

def set_with_key(key, value)
  path = path_to_key(key)
  FileUtils.mkdir_p(::File.dirname(path))
  ::File.open(path, 'wb') { |file| file.write(value.to_s) }
  value
end