Class: GRPC::Pool

Inherits:
Object
  • Object
show all
Defined in:
lib/grpc/generic/rpc_server.rb

Overview

Pool is a simple thread pool.

Constant Summary collapse

DEFAULT_KEEP_ALIVE =

Default keep alive period is 1s

1

Instance Method Summary collapse

Constructor Details

#initialize(size, keep_alive: DEFAULT_KEEP_ALIVE) ⇒ Pool

Returns a new instance of Pool.



74
75
76
77
78
79
80
81
82
83
 
# File 'lib/grpc/generic/rpc_server.rb', line 74

def initialize(size, keep_alive: DEFAULT_KEEP_ALIVE)
  fail 'pool size must be positive' unless size > 0
  @jobs = Queue.new
  @size = size
  @stopped = false
  @stop_mutex = Mutex.new
  @stop_cond = ConditionVariable.new
  @workers = []
  @keep_alive = keep_alive
end

Instance Method Details

#jobs_waiting ⇒ Object

Returns the number of jobs waiting



86
87
88
 
# File 'lib/grpc/generic/rpc_server.rb', line 86

def jobs_waiting
  @jobs.size
end

#schedule(*args, &blk) ⇒ Object

Runs the given block on the queue with the provided args.

Parameters:

  • args —

    the args passed blk when it is called

  • blk —

    the block to call



94
95
96
97
98
99
 
# File 'lib/grpc/generic/rpc_server.rb', line 94

def schedule(*args, &blk)
  fail 'already stopped' if @stopped
  return if blk.nil?
  logger.info('schedule another job')
  @jobs << [blk, args]
end

#start ⇒ Object

Starts running the jobs in the thread pool.



102
103
104
105
106
107
108
109
110
111
112
113
 
# File 'lib/grpc/generic/rpc_server.rb', line 102

def start
  fail 'already stopped' if @stopped
  until @workers.size == @size.to_i
    next_thread = Thread.new do
      catch(:exit) do  # allows { throw :exit } to kill a thread
        loop_execute_jobs
      end
      remove_current_thread
    end
    @workers << next_thread
  end
end

#stop ⇒ Object

Stops the jobs in the pool



116
117
118
119
120
121
122
123
124
125
 
# File 'lib/grpc/generic/rpc_server.rb', line 116

def stop
  logger.info('stopping, will wait for all the workers to exit')
  @workers.size.times { schedule { throw :exit } }
  @stopped = true
  @stop_mutex.synchronize do  # wait @keep_alive for works to stop
    @stop_cond.wait(@stop_mutex, @keep_alive) if @workers.size > 0
  end
  forcibly_stop_workers
  logger.info('stopped, all workers are shutdown')
end