Class: WorkQueue::Socket

Inherits:
Object
  • Object
show all
Defined in:
lib/scout/work_queue/socket.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(serializer = nil) ⇒ Socket

Returns a new instance of Socket.



7
8
9
10
11
12
13
14
15
16
17
18
 
# File 'lib/scout/work_queue/socket.rb', line 7

def initialize(serializer = nil)
  @sread, @swrite = Open.pipe

  @serializer = serializer || Marshal

  @key = "/" << rand(1000000000).to_s << '.' << Process.pid.to_s;
  @write_sem = @key + '.in'
  @read_sem = @key + '.out'
  Log.debug "Creating socket semaphores: #{@key}"
  ScoutSemaphore.create_semaphore(@write_sem,1)
  ScoutSemaphore.create_semaphore(@read_sem,1)
end

Instance Attribute Details

#cleaned ⇒ Object

Returns the value of attribute cleaned.



6
7
8
 
# File 'lib/scout/work_queue/socket.rb', line 6

def cleaned
  @cleaned
end

#exception ⇒ Object

Returns the value of attribute exception.



6
7
8
 
# File 'lib/scout/work_queue/socket.rb', line 6

def exception
  @exception
end

#read_sem ⇒ Object

Returns the value of attribute read_sem.



6
7
8
 
# File 'lib/scout/work_queue/socket.rb', line 6

def read_sem
  @read_sem
end

#sread ⇒ Object

Returns the value of attribute sread.



6
7
8
 
# File 'lib/scout/work_queue/socket.rb', line 6

def sread
  @sread
end

#swrite ⇒ Object

Returns the value of attribute swrite.



6
7
8
 
# File 'lib/scout/work_queue/socket.rb', line 6

def swrite
  @swrite
end

#write_sem ⇒ Object

Returns the value of attribute write_sem.



6
7
8
 
# File 'lib/scout/work_queue/socket.rb', line 6

def write_sem
  @write_sem
end

Instance Method Details

#abort(exception) ⇒ Object 



123
124
125
126
 
# File 'lib/scout/work_queue/socket.rb', line 123

def abort(exception)
  @exception = exception
  @swrite.close unless closed_write?
end

#clean ⇒ Object 



24
25
26
27
28
29
30
31
 
# File 'lib/scout/work_queue/socket.rb', line 24

def clean
  @cleaned = true
  @sread.close unless @sread.closed?
  @swrite.close unless @swrite.closed?
  Log.low "Destroying socket semaphores: #{[@key] * ", "}"
  ScoutSemaphore.delete_semaphore(@write_sem)
  ScoutSemaphore.delete_semaphore(@read_sem)
end

#close_read ⇒ Object 



104
105
106
 
# File 'lib/scout/work_queue/socket.rb', line 104

def close_read
  @sread.close unless closed_read?
end

#close_write ⇒ Object 



99
100
101
102
 
# File 'lib/scout/work_queue/socket.rb', line 99

def close_write
  self.dump ClosedStream.new
  @swrite.close unless closed_write?
end

#closed_read? ⇒ Boolean

Returns:

  • (Boolean) 


91
92
93
 
# File 'lib/scout/work_queue/socket.rb', line 91

def closed_read?
  @sread.closed?
end

#closed_write? ⇒ Boolean

Returns:

  • (Boolean) 


95
96
97
 
# File 'lib/scout/work_queue/socket.rb', line 95

def closed_write?
  @swrite.closed?
end

#dump(obj) ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/scout/work_queue/socket.rb', line 34

def dump(obj)
  stream = @swrite
  obj.concurrent_stream = nil if obj.respond_to?(:concurrent_stream)
  case obj
  when Integer
    size_head = [obj,"I"].pack 'La'
    str = size_head
  when nil
    size_head = [0,"N"].pack 'La'
    str = size_head
  when Annotation::AnnotatedObject
    payload = @serializer.dump(obj)
    size_head = [payload.bytesize,"S"].pack 'La'
    str = size_head << payload
  when String
    payload = obj
    size_head = [payload.bytesize,"C"].pack 'La'
    str = size_head << payload
  else
    payload = @serializer.dump(obj)
    size_head = [payload.bytesize,"S"].pack 'La'
    str = size_head << payload
  end

  write_length = str.length
  wrote = stream.write(str) 
  while wrote < write_length
    wrote += stream.write(str[wrote..-1]) 
  end
end

#load ⇒ Object 



65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
 
# File 'lib/scout/work_queue/socket.rb', line 65

def load
  stream = @sread
  size_head = Open.read_stream stream, 5

  size, type = size_head.unpack('La')

  return nil if type == "N"
  return size.to_i if type == "I"
  begin
    payload = Open.read_stream stream, size
    case type
    when "S"
      begin
        @serializer.load(payload)
      rescue Exception
        Log.exception $!
        raise $!
      end
    when "C"
      payload
    end
  rescue TryAgain
    retry
  end
end

#pop ⇒ Object Also known as: read 



115
116
117
118
119
120
121
 
# File 'lib/scout/work_queue/socket.rb', line 115

def pop
  ScoutSemaphore.synchronize(@read_sem) do
    res = self.load
    raise res if ClosedStream === res
    res
  end
end

#push(obj) ⇒ Object Also known as: write

{{{ ACCESSOR



109
110
111
112
113
 
# File 'lib/scout/work_queue/socket.rb', line 109

def push(obj)
  ScoutSemaphore.synchronize(@write_sem) do
    self.dump(obj)
  end
end

#socket_id ⇒ Object 



20
21
22
 
# File 'lib/scout/work_queue/socket.rb', line 20

def socket_id
  @key
end