In Files

  • bundler/vendor/connection_pool/lib/connection_pool.rb
  • bundler/vendor/connection_pool/lib/connection_pool/monotonic_time.rb
  • bundler/vendor/connection_pool/lib/connection_pool/timed_stack.rb
  • bundler/vendor/connection_pool/lib/connection_pool/version.rb
  • bundler/vendor/net-http-persistent/lib/net/http/persistent/pool.rb

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Bundler::ConnectionPool

Generic connection pool class for e.g. sharing a limited number of network connections among many threads. Note: Connections are lazily created.

Example usage with block (faster):

@pool = Bundler::ConnectionPool.new { Redis.new }

@pool.with do |redis|
  redis.lpop('my-list') if redis.llen('my-list') > 0
end

Using optional timeout override (for that single invocation)

@pool.with(timeout: 2.0) do |redis|
  redis.lpop('my-list') if redis.llen('my-list') > 0
end

Example usage replacing an existing connection (slower):

$redis = Bundler::ConnectionPool.wrap { Redis.new }

def do_work
  $redis.lpop('my-list') if $redis.llen('my-list') > 0
end

Accepts the following options:

  • :size - number of connections to pool, defaults to 5

  • :timeout - amount of time to wait for a connection if none currently available, defaults to 5 seconds

Constants

DEFAULTS
GLOBAL_MONOTONIC_CLOCK

Clock that cannot be set and represents monotonic time since some unspecified starting point.

@!visibility private

VERSION

Public Class Methods

monotonic_time() click to toggle source

Returns the current time a tracked by the application monotonic clock.

@return [Float] The current monotonic time when `since` not given else

the elapsed monotonic time between %x`since` and the current time
 
               # File bundler/vendor/connection_pool/lib/connection_pool/monotonic_time.rb, line 62
def monotonic_time
  GLOBAL_MONOTONIC_CLOCK.get_time
end
            
new(options = {}, &block) click to toggle source
 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 44
def initialize(options = {}, &block)
  raise ArgumentError, 'Connection pool requires a block' unless block

  options = DEFAULTS.merge(options)

  @size = options.fetch(:size)
  @timeout = options.fetch(:timeout)

  @available = TimedStack.new(@size, &block)
  @key = :"current-#{@available.object_id}"
  @key_count = :"current-#{@available.object_id}-count"
end
            
wrap(options, &block) click to toggle source
 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 40
def self.wrap(options, &block)
  Wrapper.new(options, &block)
end
            

Public Instance Methods

available() click to toggle source

Number of pool entries available for checkout at this instant.

 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 122
def available
  @available.length
end
            
checkin() click to toggle source
 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 97
def checkin
  if ::Thread.current[@key]
    if ::Thread.current[@key_count] == 1
      @available.push(::Thread.current[@key])
      ::Thread.current[@key]= nil
    else
      ::Thread.current[@key_count]-= 1
    end
  else
    raise Bundler::ConnectionPool::Error, 'no connections are checked out'
  end

  nil
end
            
checkout(options = {}) click to toggle source
 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 87
def checkout(options = {})
  if ::Thread.current[@key]
    ::Thread.current[@key_count]+= 1
    ::Thread.current[@key]
  else
    ::Thread.current[@key_count]= 1
    ::Thread.current[@key]= @available.pop(options[:timeout] || @timeout)
  end
end
            
get_time() click to toggle source

@!visibility private

 
               # File bundler/vendor/connection_pool/lib/connection_pool/monotonic_time.rb, line 15
def get_time
  Process.clock_gettime(Process::CLOCK_MONOTONIC)
end
            
shutdown(&block) click to toggle source
 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 112
def shutdown(&block)
  @available.shutdown(&block)
end
            
size() click to toggle source

Size of this connection pool

 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 117
def size
  @size
end
            
with(options = {}) click to toggle source

MRI

 
               # File bundler/vendor/connection_pool/lib/connection_pool.rb, line 60
def with(options = {})
  Thread.handle_interrupt(Exception => :never) do
    conn = checkout(options)
    begin
      Thread.handle_interrupt(Exception => :immediate) do
        yield conn
      end
    ensure
      checkin
    end
  end
end