Class: Lepus::ConnectionPool

Inherits:
Object
  • Object
show all
Defined in:
lib/lepus/connection_pool.rb

Overview

Connection pool for managing Bunny connections efficiently Similar to the connection_pool gem but using concurrent-ruby primitives

Constant Summary collapse

DEFAULT_SIZE = 
5
DEFAULT_TIMEOUT = 
5.0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(size: DEFAULT_SIZE, timeout: DEFAULT_TIMEOUT, suffix: nil) ⇒ ConnectionPool

Returns a new instance of ConnectionPool.



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# File 'lib/lepus/connection_pool.rb', line 14

def initialize(size: DEFAULT_SIZE, timeout: DEFAULT_TIMEOUT, suffix: nil)
  @pool_size = size
  @timeout = timeout
  @conn_suffix = suffix
  @available = Concurrent::Array.new
  @in_use = Concurrent::Array.new
  @semaphore = Concurrent::Semaphore.new(pool_size)
  @mutex = Concurrent::ReadWriteLock.new
  @shutdown = Concurrent::AtomicBoolean.new(false)
end

Instance Attribute Details

#conn_suffix ⇒ Object (readonly)

Returns the value of attribute conn_suffix.



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# File 'lib/lepus/connection_pool.rb', line 12

def conn_suffix
  @conn_suffix
end

#pool_size ⇒ Object (readonly)

Returns the value of attribute pool_size.



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# File 'lib/lepus/connection_pool.rb', line 12

def pool_size
  @pool_size
end

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/lepus/connection_pool.rb', line 12

def timeout
  @timeout
end

Instance Method Details

#available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lepus/connection_pool.rb', line 107

def available?
  !@shutdown.value
end

#available_count ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 117

def available_count
  @mutex.with_read_lock do
    @available.length
  end
end

#checkin(connection) ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 75

def checkin(connection)
  return unless connection

  @mutex.with_write_lock do
    @in_use.delete(connection)
    if connection.connected? && !@shutdown.value
      @available << connection
    else
      begin
        connection.close
      rescue
        nil
      end
    end
  end
  @semaphore.release
end

#checkout ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 36

def checkout
  raise Lepus::ConnectionPoolError, "Connection pool is shut down" if @shutdown.value

  # Try to acquire a permit with timeout
  start_time = Time.now
  acquired = false

  while Time.now - start_time < timeout
    if @semaphore.try_acquire
      acquired = true
      break
    end
    sleep(0.01) # Small sleep to avoid busy waiting
  end

  unless acquired
    raise Concurrent::TimeoutError, "Connection pool timeout"
  end

  @mutex.with_read_lock do
    # Try to reuse an existing connection
    connection = @available.shift
    if connection&.connected?
      @in_use << connection
      return connection
    end
  end

  # Create a new connection
  connection = Lepus.config.create_connection(suffix: @conn_suffix)
  @mutex.with_write_lock do
    @in_use << connection
  end
  connection
rescue => e
  @semaphore.release
  raise e
end

#in_use_count ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 123

def in_use_count
  @mutex.with_read_lock do
    @in_use.length
  end
end

#shutdown ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 93

def shutdown
  @shutdown.make_true

  @mutex.with_write_lock do
    (@available + @in_use).each do |connection|
      connection.close
    rescue
      nil
    end
    @available.clear
    @in_use.clear
  end
end

#size ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 111

def size
  @mutex.with_read_lock do
    @available.length + @in_use.length
  end
end

#with_connection ⇒ Object 



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# File 'lib/lepus/connection_pool.rb', line 25

def with_connection
  connection = checkout
  begin
    yield connection
  ensure
    checkin(connection)
  end
rescue Concurrent::TimeoutError
  raise Lepus::ConnectionPoolTimeoutError, "Connection pool timeout after #{timeout} seconds"
end