Class: Sequel::ShardedThreadedConnectionPool

### Home Classes Methods

### In Files

- lib/sequel/connection_pool/sharded_threaded.rb

### Parent

Sequel::ThreadedConnectionPool

### Methods

- ::new
- #add_servers
- #allocated
- #available_connections
- #disconnect
- #hold
- #remove_servers
- #servers
- #size

### Files

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No matching classes.

# Sequel::ShardedThreadedConnectionPool

The slowest and most advanced connection, dealing with both multi-threaded access and configurations with multiple shards/servers.

In addition, this pool subclass also handles scheduling in-use connections to be removed from the pool when they are returned to it.

### Public Class Methods

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

The following additional options are respected:

- :servers - A hash of servers to use. Keys should be symbols. If not present, will use a single :default server. The server name symbol will be passed to the connection_proc.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 13
    def initialize(opts = {}, &block)
      super
      @available_connections = {}
      @connections_to_remove = []
      @servers = Hash.new(:default)
      add_servers([:default])
      add_servers(opts[:servers].keys) if opts[:servers]
    end

### Public Instance Methods

add_servers(servers) click to toggle source

Adds new servers to the connection pool. Primarily used in conjunction with master/slave or shard configurations. Allows for dynamic expansion of the potential slaves/shards at runtime. servers argument should be an array of symbols.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 25
    def add_servers(servers)
      sync do
        servers.each do |server|
          unless @servers.has_key?(server)
            @servers[server] = server
            @available_connections[server] = []
            @allocated[server] = {}
          end
        end
      end
    end

allocated(server=:default) click to toggle source

A hash of connections currently being used for the given server, key is the Thread, value is the connection. Nonexistent servers will return nil. Treat this as read only, do not modify the resulting object.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 40
    def allocated(server=:default)
      @allocated[server]
    end

available_connections(server=:default) click to toggle source

An array of connections opened but not currently used, for the given server. Nonexistent servers will return nil. Treat this as read only, do not modify the resulting object.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 47
    def available_connections(server=:default)
      @available_connections[server]
    end

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. Options:

- :server - Should be a symbol specifing the server to disconnect from, or an array of symbols to specify multiple servers.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 69
    def disconnect(opts={}, &block)
      block ||= @disconnection_proc
      sync do
        (opts[:server] ? Array(opts[:server]) : @servers.keys).each do |s|
          disconnect_server(s, &block)
        end
      end
    end

hold(server=:default) 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/sharded_threaded.rb, line 92
    def hold(server=:default)
      sync{server = @servers[server]}
      t = Thread.current
      if conn = owned_connection(t, server)
        return yield(conn)
      end
      begin
        unless conn = acquire(t, server)
          time = Time.now
          timeout = time + @timeout
          sleep_time = @sleep_time
          sleep sleep_time
          until conn = acquire(t, server)
            raise(::Sequel::PoolTimeout) if Time.now > timeout
            sleep sleep_time
          end
        end
        yield conn
      rescue Sequel::DatabaseDisconnectError
        sync{@connections_to_remove << conn} if conn
        raise
      ensure
        sync{release(t, conn, server)} if conn
      end
    end

remove_servers(servers) click to toggle source

Remove servers from the connection pool. Primarily used in conjunction with master/slave or shard configurations. Similar to disconnecting from all given servers, except that after it is used, future requests for the server will use the :default server instead.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 122
    def remove_servers(servers)
      sync do
        raise(Sequel::Error, "cannot remove default server") if servers.include?(:default)
        servers.each do |server|
          if @servers.include?(server)
            disconnect_server(server, &@disconnection_proc)
            @available_connections.delete(server)
            @allocated.delete(server)
            @servers.delete(server)
          end
        end
      end
    end

servers() click to toggle source

Return an array of symbols for servers in the connection pool.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 137
    def servers
      sync{@servers.keys}
    end

size(server=:default) click to toggle source

The total number of connections opened for the given server, should be equal to available_connections.length + allocated.length. Nonexistent servers will return the created count of the default server.

    # File lib/sequel/connection_pool/sharded_threaded.rb, line 54
    def size(server=:default)
      server = @servers[server]
      @allocated[server].length + @available_connections[server].length
    end

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