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## org.hibernate.jdbc
Class ConnectionManager

    java.lang.Object
      org.hibernate.jdbc.ConnectionManager

All Implemented Interfaces:
  Serializable

    public class ConnectionManager

extends Object
implements Serializable

Encapsulates JDBC Connection management logic needed by Hibernate.

The lifecycle is intended to span a logical series of interactions with the database. Internally, this means the the lifecycle of the Session.

Author:
  Steve Ebersole
See Also:
  Serialized Form

Nested Class Summary
`static interface` | `ConnectionManager.Callback`

Constructor Summary
`ConnectionManager(SessionFactoryImplementor factory, ConnectionManager.Callback callback, ConnectionReleaseMode releaseMode, Connection connection, Interceptor interceptor)` Constructs a ConnectionManager.

Method Summary
`void` | `afterStatement()` To be called after execution of each JDBC statement.
`void` | `afterTransaction()` To be called after local transaction completion.
`Connection` | `borrowConnection()`
`Connection` | `close()` To be called after Session completion.
`static ConnectionManager` | `deserialize(ObjectInputStream ois, SessionFactoryImplementor factory, Interceptor interceptor, ConnectionReleaseMode connectionReleaseMode, JDBCContext jdbcContext)`
`void` | `flushBeginning()` Callback to let us know that a flush is beginning.
`void` | `flushEnding()` Callback to let us know that a flush is ending.
`Batcher` | `getBatcher()` The batcher managed by this ConnectionManager.
`Connection` | `getConnection()` Retrieves the connection currently managed by this ConnectionManager.
`SessionFactoryImplementor` | `getFactory()` The session factory.
`boolean` | `hasBorrowedConnection()`
`boolean` | `isAggressiveRelease()` Will connections be released after each statement execution? Connections will be released after each statement if either: the defined release-mode is `ConnectionReleaseMode.AFTER_STATEMENT`; or the defined release-mode is `ConnectionReleaseMode.AFTER_TRANSACTION` but we are in auto-commit mode.
`boolean` | `isAutoCommit()` Is the connection considered "auto-commit"?
`boolean` | `isCurrentlyConnected()` Is this ConnectionManager instance "logically" connected.
`boolean` | `isReadyForSerialization()`
`boolean` | `isSuppliedConnection()` Was the connection being used here supplied by the user?
`Connection` | `manualDisconnect()` Manually disconnect the underlying JDBC Connection.
`void` | `manualReconnect()` Manually reconnect the underlying JDBC Connection.
`void` | `manualReconnect(Connection suppliedConnection)` Manually reconnect the underlying JDBC Connection.
`void` | `releaseBorrowedConnection()`
`void` | `serialize(ObjectOutputStream oos)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ConnectionManager

    public ConnectionManager(SessionFactoryImplementor factory,
                             ConnectionManager.Callback callback,
                             ConnectionReleaseMode releaseMode,
                             Connection connection,
                             Interceptor interceptor)

  Constructs a ConnectionManager.

  This is the form used internally.

  Parameters:
    `factory` - The SessionFactory.
    `callback` - An observer for internal state change.
    `releaseMode` - The mode by which to release JDBC connections.
    `connection` - An externally supplied connection.

Method Detail

### getFactory

    public SessionFactoryImplementor getFactory()

  The session factory.

  Returns:
    the session factory.

### getBatcher

    public Batcher getBatcher()

  The batcher managed by this ConnectionManager.

  Returns:
    The batcher.

### isSuppliedConnection

    public boolean isSuppliedConnection()

  Was the connection being used here supplied by the user?

  Returns:
    True if the user supplied the JDBC connection; false otherwise

### getConnection

    public Connection getConnection()
                             throws HibernateException

  Retrieves the connection currently managed by this ConnectionManager.

  Note, that we may need to obtain a connection to return here if a connection has either not yet been obtained (non-UserSuppliedConnectionProvider) or has previously been aggressively released (if supported in this environment).

  Returns:
    The current Connection.
  Throws:
    `HibernateException` - Indicates a connection is currently not available (we are currently manually disconnected).

### hasBorrowedConnection

    public boolean hasBorrowedConnection()

### borrowConnection

    public Connection borrowConnection()

### releaseBorrowedConnection

    public void releaseBorrowedConnection()

### isAutoCommit

    public boolean isAutoCommit()
                         throws SQLException

  Is the connection considered "auto-commit"?

  Returns:
    True if we either do not have a connection, or the connection really is in auto-commit mode.
  Throws:
    `SQLException` - Can be thrown by the Connection.isAutoCommit() check.

### isAggressiveRelease

    public boolean isAggressiveRelease()

  Will connections be released after each statement execution?

  Connections will be released after each statement if either:
  - the defined release-mode is `ConnectionReleaseMode.AFTER_STATEMENT`; or
  - the defined release-mode is `ConnectionReleaseMode.AFTER_TRANSACTION` but we are in auto-commit mode.

    release-mode = `ConnectionReleaseMode.ON_CLOSE` should [b]never[/b] release a connection.

  Returns:
    True if the connections will be released after each statement; false otherwise.

### isCurrentlyConnected

    public boolean isCurrentlyConnected()

  Is this ConnectionManager instance "logically" connected. Meaning do we either have a cached connection available or do we have the ability to obtain a connection on demand.

  Returns:
    True if logically connected; false otherwise.

### afterStatement

    public void afterStatement()

  To be called after execution of each JDBC statement. Used to conditionally release the JDBC connection aggressively if the configured release mode indicates.

### afterTransaction

    public void afterTransaction()

  To be called after local transaction completion. Used to conditionally release the JDBC connection aggressively if the configured release mode indicates.

### close

    public Connection close()

  To be called after Session completion. Used to release the JDBC connection.

  Returns:
    The connection mantained here at time of close. Null if there was no connection cached internally.

### manualDisconnect

    public Connection manualDisconnect()

  Manually disconnect the underlying JDBC Connection. The assumption here is that the manager will be reconnected at a later point in time.

  Returns:
    The connection mantained here at time of disconnect. Null if there was no connection cached internally.

### manualReconnect

    public void manualReconnect()

  Manually reconnect the underlying JDBC Connection. Should be called at some point after manualDisconnect().

  This form is used for ConnectionProvider-supplied connections.

### manualReconnect

    public void manualReconnect(Connection suppliedConnection)

  Manually reconnect the underlying JDBC Connection. Should be called at some point after manualDisconnect().

  This form is used for user-supplied connections.

### flushBeginning

    public void flushBeginning()

  Callback to let us know that a flush is beginning. We use this fact to temporarily circumvent aggressive connection releasing until after the flush cycle is complete `flushEnding()`

### flushEnding

    public void flushEnding()

  Callback to let us know that a flush is ending. We use this fact to stop circumventing aggressive releasing connections.

### isReadyForSerialization

    public boolean isReadyForSerialization()

### serialize

    public void serialize(ObjectOutputStream oos)
                   throws IOException

  Throws:
    `IOException`

### deserialize

    public static ConnectionManager deserialize(ObjectInputStream ois,
                                                SessionFactoryImplementor factory,
                                                Interceptor interceptor,
                                                ConnectionReleaseMode connectionReleaseMode,
                                                JDBCContext jdbcContext)
                                         throws IOException

  Throws:
    `IOException`

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