Class: Hammerspace::Backend::Sparkey

Inherits:
Base
  • Object
show all
Defined in:
lib/hammerspace/backend/sparkey.rb

Instance Attribute Summary

Attributes inherited from Base

#frontend, #options, #path

Instance Method Summary collapse

Methods inherited from Base

#flock_works?, #initialize

Methods included from HashMethods

#==, #assoc, #delete_if, #each_key, #each_value, #empty?, #eql?, #fetch, #flatten, #has_value?, #include?, #keep_if, #key, #member?, #merge!, #rassoc, #reject!, #select!, #shift, #to_hash, #values_at

Constructor Details

This class inherits a constructor from Hammerspace::Backend::Base

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 48

def [](key)
  close_logwriter
  open_hash

  if @hash
    value = @hash[key]
    return value if value
  end
  frontend.default(key)
end

#[]=(key, value) ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 59

def []=(key, value)
  close_hash
  open_logwriter

  @logwriter[key] = value
end

#check_fs ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 10

def check_fs
  super
  warn_dir_cleanup unless dir_cleanup_works?
end

#clear ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 66

def clear
  close_hash
  close_logwriter_clear

  frontend
end

#close ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 73

def close
  close_logwriter
  close_hash
end

#delete(key) ⇒ Object

TODO: This currently always returns nil. If the key is not found, return the default value. Also, support block usage.



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# File 'lib/hammerspace/backend/sparkey.rb', line 80

def delete(key)
  close_hash
  open_logwriter

  @logwriter.del(key)
end

#dir_cleanup_works? ⇒ Boolean 



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# File 'lib/hammerspace/backend/sparkey.rb', line 15

def dir_cleanup_works?
  dir_cleanup_works = false
  ensure_path_exists(path)
  begin
    Dir.mktmpdir('dir_cleanup_works.', path) do |tmpdir|
      test       = File.join(tmpdir, 'test')
      test_tmp   = File.join(tmpdir, 'test.tmp')
      test_file  = File.join(test, 'file')
      test1      = File.join(tmpdir, 'test.1')
      test1_file = File.join(test1, 'file')
      test2      = File.join(tmpdir, 'test.2')
      test2_file = File.join(test2, 'file')

      Dir.mkdir(test1)
      FileUtils.touch(test1_file)
      File.symlink(File.basename(test1), test)

      File.open(test_file) do
        Dir.mkdir(test2)
        FileUtils.touch(test2_file)
        File.symlink(File.basename(test2), test_tmp)
        File.rename(test_tmp, test)

        FileUtils.rm_rf(test1, :secure => true)

        dir_cleanup_works = File.directory?(test1) == false
      end
    end
  rescue
  end
  dir_cleanup_works
end

#each(&block) ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 87

def each(&block)
  close_logwriter

  # Open a private copy of the hash to ensure isolation during iteration.
  # Further, Gnista segfaults if the hash is closed during iteration (e.g.,
  # from interleaved reads and writes), so a private copy ensures that
  # the hash is only closed once iteration is complete.
  hash = open_hash_private

  unless hash
    return block_given? ? nil : Enumerator.new {}
  end

  if block_given?
    begin
      hash.each(&block)
    ensure
      hash.close
    end
    frontend
  else
    # Gnista does not support each w/o a block; emulate the behavior here.
    Enumerator.new do |y|
      begin
        hash.each { |*args| y << args }
      ensure
        hash.close
      end
    end
  end
end

#has_key?(key) ⇒ Boolean 



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# File 'lib/hammerspace/backend/sparkey.rb', line 119

def has_key?(key)
  close_logwriter
  open_hash

  @hash ? @hash.include?(key) : false
end

#keys ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 126

def keys
  close_logwriter
  open_hash

  @hash ? @hash.keys : []
end

#replace(hash) ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 133

def replace(hash)
  close_hash
  open_logwriter_replace

  merge!(hash)
end

#size ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 140

def size
  close_logwriter
  open_hash

  @hash ? @hash.size : 0
end

#uid ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 147

def uid
  close_logwriter
  open_hash

  @uid
end

#values ⇒ Object 



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# File 'lib/hammerspace/backend/sparkey.rb', line 154

def values
  close_logwriter
  open_hash

  @hash ? @hash.values : []
end