### Home Classes Methods

### In Files

- lib/sequel/connection_pool/sharded_single.rb

### Parent

Sequel::ConnectionPool

### Methods

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

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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Quicksearch

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No matching classes.

# 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.

- :servers_hash - The base hash to use for the servers. By default, Sequel uses Hash.new(:default). You can use a hash with a default proc that raises an error if you want to catch all cases where a nonexistent server is used.

        # File lib/sequel/connection_pool/sharded_single.rb, line 15
    15:   def initialize(opts={}, &block)
    16:     super
    17:     @conns = {}
    18:     @servers = opts.fetch(:servers_hash, Hash.new(:default))
    19:     add_servers([:default])
    20:     add_servers(opts[:servers].keys) if opts[:servers]
    21:   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 26
    26:   def add_servers(servers)
    27:     servers.each{|s| @servers[s] = s}
    28:   end

conn(server=:default) click to toggle source

The connection for the given server.

        # File lib/sequel/connection_pool/sharded_single.rb, line 31
    31:   def conn(server=:default)
    32:     @conns[@servers[server]]
    33:   end

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

Disconnects from the database. Once a connection is requested using #, 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 39
    39:   def disconnect(opts={}, &block)
    40:     block ||= @disconnection_proc
    41:     (opts[:server] ? Array(opts[:server]) : servers).each{|s| disconnect_server(s, &block)}
    42:   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 46
    46:   def hold(server=:default)
    47:     begin
    48:       server = pick_server(server)
    49:       yield(@conns[server] ||= make_new(server))
    50:     rescue Sequel::DatabaseDisconnectError
    51:       disconnect_server(server, &@disconnection_proc)
    52:       raise
    53:     end
    54:   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 60
    60:   def remove_servers(servers)
    61:     raise(Sequel::Error, "cannot remove default server") if servers.include?(:default)
    62:     servers.each do |server|
    63:       disconnect_server(server, &@disconnection_proc)
    64:       @servers.delete(server)
    65:     end
    66:   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 69
    69:   def servers
    70:     @servers.keys
    71:   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 74
    74:   def size
    75:     @conns.length
    76:   end

### Private Instance Methods

disconnect_server(server, &block) click to toggle source

Disconnect from the given server, if connected.

        # File lib/sequel/connection_pool/sharded_single.rb, line 81
    81:   def disconnect_server(server, &block)
    82:     if conn = @conns.delete(server)
    83:       block.call(conn) if block
    84:     end
    85:   end

pick_server(server) click to toggle source

If the server given is in the hash, return it, otherwise, return the default server.

        # File lib/sequel/connection_pool/sharded_single.rb, line 88
    88:   def pick_server(server)
    89:     @servers[server]
    90:   end

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