### Home Classes Methods

### In Files

- lib/sequel/connection_pool/threaded.rb

### Parent

Sequel::ConnectionPool

### Methods

- ::new
- #acquire
- #available
- #default_make_new
- #disconnect
- #hold
- #make_new
- #owned_connection
- #release
- #size
- #sync

### 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::ThreadedConnectionPool

A connection pool allowing multi-threaded access to a pool of connections. This is the default connection pool used by Sequel.

### Attributes

max_size[R]

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

available_connections[R]

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

allocated[R]

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

### 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 22
    22:   def initialize(opts = {}, &block)
    23:     super
    24:     @max_size = Integer(opts[:max_connections] || 4)
    25:     raise(Sequel::Error, ':max_connections must be positive') if @max_size < 1
    26:     @mutex = Mutex.new
    27:     @available_connections = []
    28:     @allocated = {}
    29:     @timeout = Integer(opts[:pool_timeout] || 5)
    30:     @sleep_time = Float(opts[:pool_sleep_time] || 0.001)
    31:   end

### Public Instance Methods

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

Removes all connections currently available, 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 you want to be able to disconnect connections that are currently in use, use the ShardedThreadedConnectionPool, which can do that. This connection pool does not, for performance reasons. To use the sharded pool, pass the `:servers=>{}` option when connecting to the database.

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

        # File lib/sequel/connection_pool/threaded.rb, line 49
    49:   def disconnect(opts={}, &block)
    50:     block ||= @disconnection_proc
    51:     sync do
    52:       @available_connections.each{|conn| block.call(conn)} if block
    53:       @available_connections.clear
    54:     end
    55:   end

hold(server=nil) click to toggle source

Chooses the first available connection, 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 71
    71:   def hold(server=nil)
    72:     t = Thread.current
    73:     if conn = owned_connection(t)
    74:       return yield(conn)
    75:     end
    76:     begin
    77:       unless conn = acquire(t)
    78:         time = Time.now
    79:         timeout = time + @timeout
    80:         sleep_time = @sleep_time
    81:         sleep sleep_time
    82:         until conn = acquire(t)
    83:           raise(::Sequel::PoolTimeout) if Time.now > timeout
    84:           sleep sleep_time
    85:         end
    86:       end
    87:       yield conn
    88:     rescue Sequel::DatabaseDisconnectError
    89:       oconn = conn
    90:       conn = nil
    91:       @disconnection_proc.call(oconn) if @disconnection_proc && oconn
    92:       @allocated.delete(t)
    93:       raise
    94:     ensure
    95:       sync{release(t)} if conn
    96:     end
    97:   end

size() click to toggle source

The total number of connections opened, either available or allocated. This may not be completely accurate as it isn’t protected by the mutex.

        # File lib/sequel/connection_pool/threaded.rb, line 35
    35:   def size
    36:     @allocated.length + @available_connections.length
    37:   end

### Private Instance Methods

acquire(thread) click to toggle source

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

         # File lib/sequel/connection_pool/threaded.rb, line 104
    104:   def acquire(thread)
    105:     sync do
    106:       if conn = available
    107:         @allocated[thread] = conn
    108:       end
    109:     end
    110:   end

available() click to toggle source

Returns an available connection. 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/threaded.rb, line 115
    115:   def available
    116:     @available_connections.pop || make_new(DEFAULT_SERVER)
    117:   end

default_make_new(server) click to toggle source

Alias the default make_new method, so subclasses can call it directly.

Alias for: make_new
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/threaded.rb, line 125
    125:   def make_new(server)
    126:     if (n = size) >= @max_size
    127:       @allocated.keys.each{|t| release(t) unless t.alive?}
    128:       n = nil
    129:     end
    130:     super if (n || size) < @max_size
    131:   end

Also aliased as: default_make_new
owned_connection(thread) click to toggle source

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

         # File lib/sequel/connection_pool/threaded.rb, line 135
    135:   def owned_connection(thread)
    136:     sync{@allocated[thread]}
    137:   end

release(thread) click to toggle source

Releases the connection assigned to the supplied thread back to the pool. The calling code should already have the mutex before calling this.

         # File lib/sequel/connection_pool/threaded.rb, line 141
    141:   def release(thread)
    142:     @available_connections << @allocated.delete(thread)
    143:   end

sync() click to toggle source

Yield to the block while inside the mutex. The calling code should NOT already have the mutex before calling this.

         # File lib/sequel/connection_pool/threaded.rb, line 147
    147:   def sync
    148:     @mutex.synchronize{yield}
    149:   end

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