| Copyright | (c) 2014-2015 Peter Trško |
|---|---|
| License | BSD3 |
| Maintainer | [email protected] |
| Stability | unstable (internal module) |
| Portability | GHC specific language extensions. |
| Safe Haskell | None |
| Language | Haskell2010 |
Data.ConnectionPool.Internal.ConnectionPool
Description
Internal packages are here to provide access to internal definitions for library writers, but they should not be used in application code.
Preferably use qualified import, e.g.:
import qualified Data.ConnectionPool.Internal.ConnectionPool as Internal
This module doesn't depend on streaming-commons and other non-HaskellPlatform packages with exception of two packages resource-pool and between. Another notable thing is that this package is not OS specific. Please, bear this in mind when doing modifications.
- data ConnectionPool handlerParams connection connectionInfo = ConnectionPool {
- _resourcePool :: !(Pool (connection, connectionInfo))
- _handlerParams :: !handlerParams
- resourcePool :: Functor f => (Pool (c, i) -> f (Pool (c', i'))) -> ConnectionPool p c i -> f (ConnectionPool p c' i')
- handlerParams :: Functor f => (handlerParams -> f handlerParams') -> ConnectionPool handlerParams c i -> f (ConnectionPool handlerParams' c i)
- class HasConnectionPool p c i s | s -> p, s -> c, s -> i where
- createConnectionPool :: handlerParams -> IO (connection, connectionInfo) -> (connection -> IO ()) -> ResourcePoolParams -> IO (ConnectionPool handlerParams connection connectionInfo)
- destroyAllConnections :: ConnectionPool p c i -> IO ()
- withConnection :: MonadBaseControl IO m => ConnectionPool handlerParams connection connectionInfo -> (handlerParams -> connection -> connectionInfo -> m r) -> m r
- tryWithConnection :: MonadBaseControl IO m => ConnectionPool handlerParams connection connectionInfo -> (handlerParams -> connection -> connectionInfo -> m r) -> m (Maybe r)
Data Type For Building Connection Pools
data ConnectionPool handlerParams connection connectionInfo Source #
Simple specialized wrapper for Pool.
Definition changed in version 0.1.3 and 0.2.
Instance for Generic introduced in version 0.2.
Constructors
| ConnectionPool | |
Fields
| |
Instances
| Show handlerParams => Show (ConnectionPool handlerParams c i) Source # | Since version 0.1.3. |
| Generic (ConnectionPool handlerParams connection connectionInfo) Source # | |
| type Rep (ConnectionPool handlerParams connection connectionInfo) Source # | |
Lenses
resourcePool :: Functor f => (Pool (c, i) -> f (Pool (c', i'))) -> ConnectionPool p c i -> f (ConnectionPool p c' i') Source #
Lens for accessing underlying resource pool Pool (connection,
connectionInfo)connection represents network connection and
connectionInfo is a protocol specific information associated with the same
network connection as the connection is.
Since version 0.1.3; changed in 0.2.
handlerParams :: Functor f => (handlerParams -> f handlerParams') -> ConnectionPool handlerParams c i -> f (ConnectionPool handlerParams' c i) Source #
Lens for accessing parameters passed down to connection handler. These information will usually be implementation specific. E.g. for streaming-commons >= 1.13 we use this to pass around read buffer size, for more details see module Data.ConnectionPool.Internal.HandlerParams.
Since version 0.1.3.
class HasConnectionPool p c i s | s -> p, s -> c, s -> i where Source #
Since version 0.2.
Minimal complete definition
Methods
connectionPool :: Functor f => (ConnectionPool p c i -> f (ConnectionPool p c i)) -> s -> f s Source #
Lens for accessing ConnectionPool wrapped in a data type.
Instances
| HasConnectionPool HandlerParams Socket () (ConnectionPool * UnixClient) Source # | Since version 0.2. |
| HasConnectionPool HandlerParams Socket SockAddr (ConnectionPool * TcpClient) Source # | Since version 0.2. |
Lifted Resource Pool Operations
Operations on Pool lifted to work on ConnectionPool data type.
Arguments
| :: handlerParams | Data type passed down to individual connection handlers. Since version 0.1.3. |
| -> IO (connection, connectionInfo) | Acquire a connection which is represented by a Changed in version 0.2. |
| -> (connection -> IO ()) | Release a connection which is represented by a Changed in version 0.2. |
| -> ResourcePoolParams | Data type representing all |
| -> IO (ConnectionPool handlerParams connection connectionInfo) | Created connection pool that is parametrised by additional connection details. |
Specialized wrapper for createPool, see its documentation for
details.
Definition changed in version 0.1.3 and version 0.2.
destroyAllConnections :: ConnectionPool p c i -> IO () Source #
Destroy all connections that might be still open in a connection pool. This is useful when one needs to release all resources at once and not to wait for idle timeout to be reached.
For more details see destroyAllResources.
Since version 0.1.1.0.
withConnection :: MonadBaseControl IO m => ConnectionPool handlerParams connection connectionInfo -> (handlerParams -> connection -> connectionInfo -> m r) -> m r Source #
Specialized wrapper for withResource.
Changed in version 0.2.
tryWithConnection :: MonadBaseControl IO m => ConnectionPool handlerParams connection connectionInfo -> (handlerParams -> connection -> connectionInfo -> m r) -> m (Maybe r) Source #
Specialized wrapper for tryWithResource.
Since version 0.2.