Class: Puppet::Util::Lockfile Private

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/util/lockfile.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

This class provides a simple API for managing a lock file whose contents are an (optional) String. In addition to querying the basic state (#locked?) of the lock, managing the lock (#lock, #unlock), the contents can be retrieved at any time while the lock is held (#lock_data). This can be used to store pids, messages, etc.

See Also:

Direct Known Subclasses

JsonLockfile

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file_path) ⇒ Lockfile

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Lockfile.


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# File 'lib/puppet/util/lockfile.rb', line 12

def initialize(file_path)
  @file_path = file_path
end

Instance Attribute Details

#file_pathObject (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/puppet/util/lockfile.rb', line 10

def file_path
  @file_path
end

Instance Method Details

#lock(lock_data = nil) ⇒ boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns true if lock is successfully acquired, false otherwise.

Returns:

  • (boolean)

    true if lock is successfully acquired, false otherwise.


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# File 'lib/puppet/util/lockfile.rb', line 25

def lock(lock_data = nil)
  begin
    Puppet::FileSystem.exclusive_create(@file_path, nil) do |fd|
      fd.print(lock_data)
    end
    true
  rescue Errno::EEXIST
    false
  end
end

#lock_dataString

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Retrieve the (optional) lock data that was specified at the time the file

was locked.

Returns:

  • (String)

    the data object.


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# File 'lib/puppet/util/lockfile.rb', line 53

def lock_data
  return File.read(@file_path) if file_locked?
end

#locked?Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean)

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# File 'lib/puppet/util/lockfile.rb', line 45

def locked?
  # delegate logic to a more explicit private method
  file_locked?
end

#unlockObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/puppet/util/lockfile.rb', line 36

def unlock
  if locked?
    Puppet::FileSystem.unlink(@file_path)
    true
  else
    false
  end
end