Class: A2A::Client::ConnectionPool

Inherits:
Object
  • Object
show all
Includes:
MonitorMixin
Defined in:
lib/a2a/client/connection_pool.rb

Overview

Connection pool manager for HTTP clients

Manages a pool of HTTP connections to improve performance by reusing connections and avoiding the overhead of establishing new connections for each request.

Constant Summary collapse

DEFAULT_POOL_SIZE =

Default pool configuration

5
DEFAULT_TIMEOUT = 
5
DEFAULT_IDLE_TIMEOUT = 
30

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(size: DEFAULT_POOL_SIZE, timeout: DEFAULT_TIMEOUT, idle_timeout: DEFAULT_IDLE_TIMEOUT) { ... } ⇒ ConnectionPool

Initialize a new connection pool

Parameters:

  • (defaults to: DEFAULT_POOL_SIZE)

    Maximum number of connections in the pool

  • (defaults to: DEFAULT_TIMEOUT)

    Timeout for checking out a connection

  • (defaults to: DEFAULT_IDLE_TIMEOUT)

    Timeout for idle connections

Yields:

  • Block that creates a new connection



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# File 'lib/a2a/client/connection_pool.rb', line 31

def initialize(size: DEFAULT_POOL_SIZE, timeout: DEFAULT_TIMEOUT, idle_timeout: DEFAULT_IDLE_TIMEOUT, &block)
  super()

  @size = size
  @timeout = timeout
  @idle_timeout = idle_timeout
  @connection_factory = block
  @pool = []
  @checked_out = []
  @created = 0
  @last_cleanup = Time.now
end

Instance Attribute Details

#checked_out ⇒ Object (readonly)

Returns the value of attribute checked_out.



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# File 'lib/a2a/client/connection_pool.rb', line 22

def checked_out
  @checked_out
end

#created ⇒ Object (readonly)

Returns the value of attribute created.



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# File 'lib/a2a/client/connection_pool.rb', line 22

def created
  @created
end

#idle_timeout ⇒ Object (readonly)

Returns the value of attribute idle_timeout.



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# File 'lib/a2a/client/connection_pool.rb', line 22

def idle_timeout
  @idle_timeout
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/a2a/client/connection_pool.rb', line 22

def size
  @size
end

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/a2a/client/connection_pool.rb', line 22

def timeout
  @timeout
end

Instance Method Details

#checkin(connection) ⇒ Object

Check in a connection to the pool

Parameters:

  • The connection to return to the pool



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# File 'lib/a2a/client/connection_pool.rb', line 83

def checkin(connection)
  synchronize do
    @checked_out.delete(connection)

    # Add connection back to pool if it's still valid
    if valid_connection?(connection)
      connection.instance_variable_set(:@last_used, Time.now)
      @pool.push(connection)
    else
      # Connection is invalid, create a new one to replace it
      @created -= 1
    end
  end
end

#checkout ⇒ Object

Check out a connection from the pool

Returns:

  • A connection from the pool

Raises:

  • If no connection is available within timeout



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# File 'lib/a2a/client/connection_pool.rb', line 49

def checkout
  synchronize do
    # Try to get an existing connection
    connection = @pool.pop

    # Create a new connection if pool is empty and we haven't reached the limit
    connection = create_connection if connection.nil? && @created < @size

    # Wait for a connection to become available
    if connection.nil?
      deadline = Time.now + @timeout

      while connection.nil? && Time.now < deadline
        ns_wait(0.1) # Wait 100ms
        connection = @pool.pop
      end

      raise TimeoutError, "Could not checkout connection within #{@timeout}s" if connection.nil?
    end

    # Mark connection as checked out
    @checked_out << connection

    # Cleanup idle connections periodically
    cleanup_idle_connections if should_cleanup?

    connection
  end
end

#cleanup_idle_connections ⇒ Object (private)

Clean up idle connections



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# File 'lib/a2a/client/connection_pool.rb', line 211

def cleanup_idle_connections
  @last_cleanup = Time.now
  cutoff_time = Time.now - @idle_timeout

  @pool.reject! do |connection|
    last_used = connection.instance_variable_get(:@last_used)
    if last_used && last_used < cutoff_time
      close_connection(connection)
      @created -= 1
      true
    else
      false
    end
  end
end

#close_all ⇒ Object

Close all connections in the pool



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# File 'lib/a2a/client/connection_pool.rb', line 132

def close_all
  synchronize do
    (@pool + @checked_out).each do |connection|
      close_connection(connection)
    end

    @pool.clear
    @checked_out.clear
    @created = 0
  end
end

#close_connection(connection) ⇒ Object (private)

Close a connection

Parameters:

  • Connection to close



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# File 'lib/a2a/client/connection_pool.rb', line 194

def close_connection(connection)
  connection.close if connection.respond_to?(:close)
rescue StandardError
  # Ignore errors when closing connections
end

#create_connection ⇒ Object (private)

Create a new connection

Returns:

  • New connection



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# File 'lib/a2a/client/connection_pool.rb', line 159

def create_connection
  return nil unless @connection_factory

  connection = @connection_factory.call
  connection.instance_variable_set(:@created_at, Time.now)
  connection.instance_variable_set(:@last_used, Time.now)
  @created += 1

  connection
end

#flush_idle! ⇒ Object

Flush idle connections from the pool



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# File 'lib/a2a/client/connection_pool.rb', line 147

def flush_idle!
  synchronize do
    cleanup_idle_connections
  end
end

#should_cleanup? ⇒ Boolean (private)

Check if we should run cleanup

Returns:

  • True if cleanup should run



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# File 'lib/a2a/client/connection_pool.rb', line 204

def should_cleanup?
  Time.now - @last_cleanup > 60 # Cleanup every minute
end

#stats ⇒ Hash

Get pool statistics

Returns:

  • Pool statistics



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# File 'lib/a2a/client/connection_pool.rb', line 116

def stats
  synchronize do
    {
      size: @size,
      created: @created,
      available: @pool.size,
      checked_out: @checked_out.size,
      idle_timeout: @idle_timeout,
      timeout: @timeout
    }
  end
end

#valid_connection?(connection) ⇒ Boolean (private)

Check if a connection is valid

Parameters:

  • Connection to validate

Returns:

  • True if connection is valid



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# File 'lib/a2a/client/connection_pool.rb', line 175

def valid_connection?(connection)
  return false unless connection

  # Check if connection responds to basic methods
  return false unless connection.respond_to?(:get) || connection.respond_to?(:request)

  # Check if connection is not too old
  created_at = connection.instance_variable_get(:@created_at)
  return false if created_at && (Time.now - created_at) > (@idle_timeout * 10)

  true
rescue StandardError
  false
end

#with_connection {|connection| ... } ⇒ Object

Execute a block with a connection from the pool

Yields:

  • (connection) —

    Block to execute with the connection

Returns:

  • Result of the block



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# File 'lib/a2a/client/connection_pool.rb', line 103

def with_connection
  connection = checkout
  begin
    yield connection
  ensure
    checkin(connection)
  end
end