Class: Sanford::PIDFile

Inherits:
Object
  • Object
show all
Defined in:
lib/sanford/pid_file.rb

Constant Summary collapse

InvalidError = 
Class.new(RuntimeError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ PIDFile

Returns a new instance of PIDFile.



8
9
10
 
# File 'lib/sanford/pid_file.rb', line 8

def initialize(path)
  @path = (path || '/dev/null').to_s
end

Instance Attribute Details

#path ⇒ Object (readonly)

Returns the value of attribute path.



6
7
8
 
# File 'lib/sanford/pid_file.rb', line 6

def path
  @path
end

Instance Method Details

#pid ⇒ Object 



12
13
14
15
16
17
18
19
 
# File 'lib/sanford/pid_file.rb', line 12

def pid
  pid = File.read(@path).strip
  pid && !pid.empty? ? pid.to_i : raise('no pid in file')
rescue StandardError => exception
  error = InvalidError.new("A PID couldn't be read from #{@path.inspect}")
  error.set_backtrace(exception.backtrace)
  raise error
end

#remove ⇒ Object 



30
31
32
 
# File 'lib/sanford/pid_file.rb', line 30

def remove
  FileUtils.rm_f(@path)
end

#to_s ⇒ Object 



34
35
36
 
# File 'lib/sanford/pid_file.rb', line 34

def to_s
  @path
end

#write ⇒ Object 



21
22
23
24
25
26
27
28
 
# File 'lib/sanford/pid_file.rb', line 21

def write
  FileUtils.mkdir_p(File.dirname(@path))
  File.open(@path, 'w'){ |f| f.puts ::Process.pid }
rescue StandardError => exception
  error = InvalidError.new("Can't write pid to file #{@path.inspect}")
  error.set_backtrace(exception.backtrace)
  raise error
end