Module: VirtFS::Activation

Included in:
VirtFS
Defined in:
lib/virtfs/activation.rb

Instance Method Summary collapse

Instance Method Details

#activate!(enable_require = false) ⇒ Object

Overrides Ruby’s native Dir, File, and IO classes with corresponding VirtFS classes



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# File 'lib/virtfs/activation.rb', line 17

def activate!(enable_require = false)
  activate_mutex.synchronize do
    raise "VirtFS.activate! already activated" if @activated
    @activated = true

    Object.class_eval do
      remove_const(:Dir)
      remove_const(:File)
      remove_const(:IO)
      remove_const(:Pathname)

      const_set(:Dir,      VirtFS::VDir)
      const_set(:File,     VirtFS::VFile)
      const_set(:IO,       VirtFS::VIO)
      const_set(:Pathname, VirtFS::VPathname)
    end

    if enable_require
      VirtFS::Kernel.inject
      VirtFS::Kernel.enable
    end
  end
  true
end

#activate_mutex ⇒ Object 



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# File 'lib/virtfs/activation.rb', line 3

def activate_mutex
  @activate_mutex ||= Mutex.new
end

#activated? ⇒ Boolean

Returns indicating if VirtFS is active.

Returns:

  • (Boolean) —

    indicating if VirtFS is active

See Also:



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# File 'lib/virtfs/activation.rb', line 11

def activated?
  @activated
end

#deactivate! ⇒ Object

Restores Ruby’s native Dir, File, and IO classes to their defaults



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# File 'lib/virtfs/activation.rb', line 44

def deactivate!
  activate_mutex.synchronize do
    raise "VirtFS.deactivate! not activated" unless @activated
    @activated = false

    Object.class_eval do
      remove_const(:Dir)
      remove_const(:File)
      remove_const(:IO)
      remove_const(:Pathname)

      const_set(:Dir,      VfsRealDir)
      const_set(:File,     VfsRealFile)
      const_set(:IO,       VfsRealIO)
      const_set(:Pathname, VfsRealPathname)
    end
    VirtFS::Kernel.disable
  end
  true
end

#with(enable_require = false) ⇒ Object

Invokes the given block in an activated context

See Also:



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# File 'lib/virtfs/activation.rb', line 68

def with(enable_require = false)
  if activated?
    yield
  else
    begin
      activate!(enable_require)
      yield
    ensure
      deactivate!
    end
  end
end

#without ⇒ Object

Invokes the given block in a deactivated context

See Also:



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# File 'lib/virtfs/activation.rb', line 84

def without
  if !activated?
    yield
  else
    begin
      deactivate!
      yield
    ensure
      activate!
    end
  end
end