Class: Sequel::ShardedSingleConnectionPool

### Home Classes Methods

### In Files

- lib/sequel/connection_pool/sharded_single.rb

### Parent

Sequel::ConnectionPool

### Methods

- ::new
- #add_servers
- #conn
- #disconnect
- #hold
- #remove_servers
- #servers
- #size

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# Sequel::ShardedSingleConnectionPool

A ShardedSingleConnectionPool is a single threaded connection pool that works with multiple shards/servers.

### Public Class Methods

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

Initializes the instance with the supplied block as the connection_proc.

The single threaded pool takes the following options:

- :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_single.rb, line 11
    def initialize(opts={}, &block)
      super
      @conns = {}
      @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_single.rb, line 22
    def add_servers(servers)
      servers.each{|s| @servers[s] = s}
    end

conn(server=:default) click to toggle source

The connection for the given server.

    # File lib/sequel/connection_pool/sharded_single.rb, line 27
    def conn(server=:default)
      @conns[@servers[server]]
    end

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

Disconnects from the database. Once a connection is requested using hold, the connection is reestablished. 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_single.rb, line 35
    def disconnect(opts={}, &block)
      block ||= @disconnection_proc
      (opts[:server] ? Array(opts[:server]) : servers).each{|s| disconnect_server(s, &block)}
    end

hold(server=:default) click to toggle source

Yields the connection to the supplied block for the given server. This method simulates the ConnectionPool#hold API.

    # File lib/sequel/connection_pool/sharded_single.rb, line 42
    def hold(server=:default)
      begin
        server = @servers[server]
        yield(@conns[server] ||= make_new(server))
      rescue Sequel::DatabaseDisconnectError
        disconnect_server(server, &@disconnection_proc)
        raise
      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_single.rb, line 56
    def remove_servers(servers)
      raise(Sequel::Error, "cannot remove default server") if servers.include?(:default)
      servers.each do |server|
        disconnect_server(server, &@disconnection_proc)
        @servers.delete(server)
      end
    end

servers() click to toggle source

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

    # File lib/sequel/connection_pool/sharded_single.rb, line 65
    def servers
      @servers.keys
    end

size() click to toggle source

The number of different shards/servers this pool is connected to.

    # File lib/sequel/connection_pool/sharded_single.rb, line 70
    def size
      @conns.length
    end

[Validate]

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