### Home Classes Methods

### In Files

- lib/sequel/connection_pool/sharded_threaded.rb

### Parent

Sequel::ThreadedConnectionPool

### Methods

- ::new
- #acquire
- #add_servers
- #allocated
- #available
- #available_connections
- #disconnect
- #disconnect_server
- #hold
- #make_new
- #owned_connection
- #pick_server
- #release
- #remove
- #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

### Class Index

Quicksearch

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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.

- :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_threaded.rb, line 17
    17:   def initialize(opts = {}, &block)
    18:     super
    19:     @available_connections = {}
    20:     @connections_to_remove = []
    21:     @servers = opts.fetch(:servers_hash, Hash.new(:default))
    22:     add_servers([:default])
    23:     add_servers(opts[:servers].keys) if opts[:servers]
    24:   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 29
    29:   def add_servers(servers)
    30:     sync do
    31:       servers.each do |server|
    32:         unless @servers.has_key?(server)
    33:           @servers[server] = server
    34:           @available_connections[server] = []
    35:           @allocated[server] = {}
    36:         end
    37:       end
    38:     end
    39:   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 44
    44:   def allocated(server=:default)
    45:     @allocated[server]
    46:   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 51
    51:   def available_connections(server=:default)
    52:     @available_connections[server]
    53:   end

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

Removes all connections 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 #, 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 73
    73:   def disconnect(opts={}, &block)
    74:     block ||= @disconnection_proc
    75:     sync do
    76:       (opts[:server] ? Array(opts[:server]) : @servers.keys).each do |s|
    77:         disconnect_server(s, &block)
    78:       end
    79:     end
    80:   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 96
     96:   def hold(server=:default)
     97:     server = pick_server(server)
     98:     t = Thread.current
     99:     if conn = owned_connection(t, server)
    100:       return yield(conn)
    101:     end
    102:     begin
    103:       unless conn = acquire(t, server)
    104:         time = Time.now
    105:         timeout = time + @timeout
    106:         sleep_time = @sleep_time
    107:         sleep sleep_time
    108:         until conn = acquire(t, server)
    109:           raise(::Sequel::PoolTimeout) if Time.now > timeout
    110:           sleep sleep_time
    111:         end
    112:       end
    113:       yield conn
    114:     rescue Sequel::DatabaseDisconnectError
    115:       sync{@connections_to_remove << conn} if conn
    116:       raise
    117:     ensure
    118:       sync{release(t, conn, server)} if conn
    119:     end
    120:   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 126
    126:   def remove_servers(servers)
    127:     sync do
    128:       raise(Sequel::Error, "cannot remove default server") if servers.include?(:default)
    129:       servers.each do |server|
    130:         if @servers.include?(server)
    131:           disconnect_server(server, &@disconnection_proc)
    132:           @available_connections.delete(server)
    133:           @allocated.delete(server)
    134:           @servers.delete(server)
    135:         end
    136:       end
    137:     end
    138:   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 141
    141:   def servers
    142:     sync{@servers.keys}
    143:   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 58
    58:   def size(server=:default)
    59:     server = @servers[server]
    60:     @allocated[server].length + @available_connections[server].length
    61:   end

### Private Instance Methods

acquire(thread, server) click to toggle source

Assigns a connection to the supplied thread for the given server, if one is available. The calling code should NOT already have the mutex when calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 150
    150:   def acquire(thread, server)
    151:     sync do
    152:       if conn = available(server)
    153:         allocated(server)[thread] = conn
    154:       end
    155:     end
    156:   end

available(server) click to toggle source

Returns an available connection to the given server. If no connection is available, tries to create a new connection. The calling code should already have the mutex before calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 161
    161:   def available(server)
    162:     available_connections(server).pop || make_new(server)
    163:   end

disconnect_server(server, &block) click to toggle source

Disconnect from the given server. Disconnects available connections immediately, and schedules currently allocated connections for disconnection as soon as they are returned to the pool. The calling code should already have the mutex before calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 169
    169:   def disconnect_server(server, &block)
    170:     if conns = available_connections(server)
    171:       conns.each{|conn| block.call(conn)} if block
    172:       conns.clear
    173:     end
    174:     @connections_to_remove.concat(allocated(server).values)
    175:   end

make_new(server) click to toggle source

Creates a new connection to the given server if the size of the pool for the server is less than the maximum size of the pool. The calling code should already have the mutex before calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 180
    180:   def make_new(server)
    181:     if (n = size(server)) >= @max_size
    182:       allocated(server).to_a.each{|t, c| release(t, c, server) unless t.alive?}
    183:       n = nil
    184:     end
    185:     default_make_new(server) if (n || size(server)) < @max_size
    186:   end

owned_connection(thread, server) click to toggle source

Returns the connection owned by the supplied thread for the given server, if any. The calling code should NOT already have the mutex before calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 190
    190:   def owned_connection(thread, server)
    191:     sync{@allocated[server][thread]}
    192:   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_threaded.rb, line 195
    195:   def pick_server(server)
    196:     sync{@servers[server]}
    197:   end

release(thread, conn, server) click to toggle source

Releases the connection assigned to the supplied thread and server. If the server or connection given is scheduled for disconnection, remove the connection instead of releasing it back to the pool. The calling code should already have the mutex before calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 203
    203:   def release(thread, conn, server)
    204:     if @connections_to_remove.include?(conn)
    205:       remove(thread, conn, server)
    206:     else
    207:       available_connections(server) << allocated(server).delete(thread)
    208:     end
    209:   end

remove(thread, conn, server) click to toggle source

Removes the currently allocated connection from the connection pool. The calling code should already have the mutex before calling this.

         # File lib/sequel/connection_pool/sharded_threaded.rb, line 213
    213:   def remove(thread, conn, server)
    214:     @connections_to_remove.delete(conn)
    215:     allocated(server).delete(thread) if @servers.include?(server)
    216:     @disconnection_proc.call(conn) if @disconnection_proc
    217:   end

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