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ConnectionManager (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.jdbc
Class ConnectionManager

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

All Implemented Interfaces:

Serializable

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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

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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.

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getBatcher

public Batcher getBatcher()

The batcher managed by this ConnectionManager.

Returns:

The batcher.

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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

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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).

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hasBorrowedConnection

public boolean hasBorrowedConnection()

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borrowConnection

public Connection borrowConnection()

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releaseBorrowedConnection

public void releaseBorrowedConnection()

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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()

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flushEnding

public void flushEnding()

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

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isReadyForSerialization

public boolean isReadyForSerialization()

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serialize

public void serialize(ObjectOutputStream oos)
               throws IOException

Throws:

IOException

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deserialize

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

Throws:

IOException

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