Class: Sequel::ThreadedConnectionPool

### Home Classes Methods

### In Files

- lib/sequel/connection_pool/threaded.rb

### Parent

Sequel::ConnectionPool

### Methods

- ::new
- #disconnect
- #hold
- #size

### Files

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No matching classes.

# Sequel::ThreadedConnectionPool

A connection pool allowing multi-threaded access to a pool of connections.

### Attributes

allocated[R]

A hash with thread keys and connection values for currently allocated connections.

available_connections[R]

An array of connections that are available for use by the pool.

max_size[R]

The maximum number of connections this pool will create (per shard/server if sharding).

### Public Class Methods

new(opts = {}, &block) click to toggle source

The following additional options are respected:

- :max_connections - The maximum number of connections the connection pool will open (default 4)

- :pool_sleep_time - The amount of time to sleep before attempting to acquire a connection again (default 0.001)

- :pool_timeout - The amount of seconds to wait to acquire a connection before raising a PoolTimeoutError (default 5)

    # File lib/sequel/connection_pool/threaded.rb, line 21
    def initialize(opts = {}, &block)
      super
      @max_size = Integer(opts[:max_connections] || 4)
      raise(Sequel::Error, ':max_connections must be positive') if @max_size < 1
      @mutex = Mutex.new
      @available_connections = []
      @allocated = {}
      @timeout = Integer(opts[:pool_timeout] || 5)
      @sleep_time = Float(opts[:pool_sleep_time] || 0.001)
    end

### Public Instance Methods

disconnect(opts={}, &block) click to toggle source

Removes all connection currently available on all servers, optionally yielding each connection to the given block. This method has the effect of disconnecting from the database, assuming that no connections are currently being used. If connections are being used, they are scheduled to be disconnected as soon as they are returned to the pool.

Once a connection is requested using hold, the connection pool creates new connections to the database.

    # File lib/sequel/connection_pool/threaded.rb, line 46
    def disconnect(opts={}, &block)
      block ||= @disconnection_proc
      sync do
        @available_connections.each{|conn| block.call(conn)} if block
        @available_connections.clear
      end
    end

hold(server=nil) click to toggle source

Chooses the first available connection to the given server, or if none are available, creates a new connection. Passes the connection to the supplied block:

    pool.hold {|conn| conn.execute('DROP TABLE posts')}

Pool#hold is re-entrant, meaning it can be called recursively in the same thread without blocking.

If no connection is immediately available and the pool is already using the maximum number of connections, Pool#hold will block until a connection is available or the timeout expires. If the timeout expires before a connection can be acquired, a Sequel::PoolTimeout is raised.

    # File lib/sequel/connection_pool/threaded.rb, line 68
    def hold(server=nil)
      t = Thread.current
      if conn = owned_connection(t)
        return yield(conn)
      end
      begin
        unless conn = acquire(t)
          time = Time.now
          timeout = time + @timeout
          sleep_time = @sleep_time
          sleep sleep_time
          until conn = acquire(t)
            raise(::Sequel::PoolTimeout) if Time.now > timeout
            sleep sleep_time
          end
        end
        yield conn
      rescue Sequel::DatabaseDisconnectError
        @disconnection_proc.call(conn) if @disconnection_proc && conn
        @allocated.delete(t)
        conn = nil
        raise
      ensure
        sync{release(t)} if conn
      end
    end

size() click to toggle source

The total number of connections opened for the given server, should be equal to available_connections.length + allocated.length.

    # File lib/sequel/connection_pool/threaded.rb, line 34
    def size
      @allocated.length + @available_connections.length
    end

[Validate]

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