Class: FiberConnectionPool

Inherits:
Sequel::ConnectionPool
  • Object
show all
Defined in:
lib/stack-service-base/fiber_pool.rb

Overview

$stdout.sync = true

Constant Summary collapse

VALIDATION_TIMEOUT = 
20
POOL_SIZE = 
10

Instance Method Summary collapse

Constructor Details

#initialize(db, opts = OPTS) ⇒ FiberConnectionPool

Returns a new instance of FiberConnectionPool.



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# File 'lib/stack-service-base/fiber_pool.rb', line 22

def initialize(db, opts = OPTS)
  otl_span "FiberConnectionPool.initialize" do |span|
    super
    @allocator = ->() {
      make_new(:default).tap { |conn|
        log "new connection (fiber pool) #{conn}"
      }
    }
    @stock = []
    @acquired = {}
    @sp = Async::Semaphore.new opts[:max_connections] || POOL_SIZE
  end
end

Instance Method Details

#disconnect(symbol) ⇒ Object

def preconnect(_concurrent = false) = :unimplemented



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# File 'lib/stack-service-base/fiber_pool.rb', line 82

def disconnect(symbol)
  until @stock.empty?
    log 'disconnect connection (fiber pool)'
    @stock.shift.close
  end
end

#hold(_server = nil) ⇒ Object 



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# File 'lib/stack-service-base/fiber_pool.rb', line 45

def hold(_server = nil)
  return yield @acquired[Fiber.current] if @acquired[Fiber.current] # protect from recursion
  log "hold in (fiber pool: #{__id__}) #{@stock.map{_1.__id__}}"
  fiber = Fiber.current
  try_count = 2

  @sp.acquire do
    until @acquired[fiber] &&
      ( @acquired[fiber].instance_eval { @last_use_.nil? || (Time.now - @last_use_).to_i < VALIDATION_TIMEOUT } ||
        is_valid_connection?(@acquired[fiber]) )

      @acquired[fiber] = @stock.shift || @allocator.call
    end

    @acquired[fiber].instance_eval { @last_use_ = Time.now }
    yield @acquired[fiber]

  rescue Sequel::DatabaseDisconnectError => e
    log "remove connection (fiber pool) retry(#{try_count})"
    @acquired.delete(fiber)
    (try_count -=1) < 0 ? raise : retry

  rescue =>e
    $stdout.puts e.message
    $stdout.puts e.backtrace[0..10].join "\n"
    log 'remove connection (fiber pool) give up'
    @acquired.delete(fiber)
    raise
  ensure
    @stock.push @acquired.delete(fiber) if @acquired[fiber]
    log "hold out (fiber pool: #{__id__}) #{@stock.map{_1.__id__}}"
  end
end

#is_valid_connection?(conn) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stack-service-base/fiber_pool.rb', line 36

def is_valid_connection?(conn)
  sql = valid_connection_sql
  log_connection_execute(conn, sql)
  true
rescue =>e_
  conn.close rescue nil
  false
end

#log(msg) ⇒ Object 



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# File 'lib/stack-service-base/fiber_pool.rb', line 9

def log(msg)
  otl_current_span{ |span|
    span.add_event("FiberPool", attributes: {
      F: Fiber.current.__id__, T: Thread.current.__id__, A: self.__id__,
      message: msg
    }.transform_keys(&:to_s) )
  }

  return if defined? PERFORMANCE
  $stdout.puts "F:#{Fiber.current.__id__} : T:#{Thread.current.__id__} : A:#{self.__id__} : #{msg}"
  # LOGGER.debug :fiber_pool, msg
end

#max_size ⇒ Object 



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# File 'lib/stack-service-base/fiber_pool.rb', line 80

def max_size = @sp.limit
# def preconnect(_concurrent = false) = :unimplemented

#pool_type ⇒ Object

def servers = []



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# File 'lib/stack-service-base/fiber_pool.rb', line 89

def pool_type = :fiber # :threaded

#size ⇒ Object 



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# File 'lib/stack-service-base/fiber_pool.rb', line 79

def size = @acquired.size

#sync ⇒ Object

:threaded



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# File 'lib/stack-service-base/fiber_pool.rb', line 90

def sync = yield