org.datanucleus.store.rdbms.datasource.dbcp.managed

Class ManagedConnection

java.lang.Object

org.datanucleus.store.rdbms.datasource.dbcp.AbandonedTrace

org.datanucleus.store.rdbms.datasource.dbcp.DelegatingConnection

org.datanucleus.store.rdbms.datasource.dbcp.managed.ManagedConnection

All Implemented Interfaces:

AutoCloseable, Connection, Wrapper

public class ManagedConnection
extends DelegatingConnection

ManagedConnection is responsible for managing a database connection in a transactional environment (typically called "Container Managed"). A managed connection operates like any other connection when no global transaction (a.k.a. XA transaction or JTA Transaction) is in progress. When a global transaction is active a single physical connection to the database is used by all ManagedConnections accessed in the scope of the transaction. Connection sharing means that all data access during a transaction has a consistent view of the database. When the global transaction is committed or rolled back the enlisted connections are committed or rolled back. Typically upon transaction completion, a connection returns to the auto commit setting in effect before being enlisted in the transaction, but some vendors do not properly implement this. When enlisted in a transaction the setAutoCommit(), commit(), rollback(), and setReadOnly() methods throw a SQLException. This is necessary to assure that the transaction completes as a single unit.

Version:

$Revision$

Author:

Dain Sundstrom

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	ManagedConnection.CompletionListener Delegates to transactionComplete() for transaction completion events.

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.datasource.dbcp.DelegatingConnection

_closed, _conn

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Constructor Summary

Constructors

Constructor and Description
ManagedConnection(ObjectPool pool, TransactionRegistry transactionRegistry, boolean accessToUnderlyingConnectionAllowed)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	checkOpen()
void	close() Closes the underlying connection, and close any Statements that were not explicitly closed.
void	commit()
Connection	getDelegate() Returns my underlying Connection.
Connection	getInnermostDelegate() If my underlying Connection is not a DelegatingConnection, returns it, otherwise recursively invokes this method on my delegate.
boolean	isAccessToUnderlyingConnectionAllowed() If false, getDelegate() and getInnermostDelegate() will return null.
void	rollback()
void	setAutoCommit(boolean autoCommit)
void	setReadOnly(boolean readOnly)
protected void	transactionComplete()

Methods inherited from class org.datanucleus.store.rdbms.datasource.dbcp.DelegatingConnection

abort, activate, clearWarnings, createArrayOf, createBlob, createClob, createNClob, createSQLXML, createStatement, createStatement, createStatement, createStruct, equals, getAutoCommit, getCatalog, getClientInfo, getClientInfo, getDelegateInternal, getHoldability, getInnermostDelegateInternal, getMetaData, getNetworkTimeout, getSchema, getTransactionIsolation, getTypeMap, getWarnings, handleException, hashCode, innermostDelegateEquals, isClosed, isReadOnly, isValid, isWrapperFor, nativeSQL, passivate, prepareCall, prepareCall, prepareCall, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, releaseSavepoint, rollback, setCatalog, setClientInfo, setClientInfo, setDelegate, setHoldability, setNetworkTimeout, setSavepoint, setSavepoint, setSchema, setTransactionIsolation, setTypeMap, toString, unwrap

Methods inherited from class org.datanucleus.store.rdbms.datasource.dbcp.AbandonedTrace

addTrace, clearTrace, getConfig, getLastUsed, getTrace, printStackTrace, removeTrace, setLastUsed, setLastUsed, setStackTrace

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ManagedConnection

public ManagedConnection(ObjectPool pool,
                 TransactionRegistry transactionRegistry,
                 boolean accessToUnderlyingConnectionAllowed)
                  throws SQLException

Throws:

SQLException

Method Detail

checkOpen

protected void checkOpen()
                  throws SQLException

Overrides:

checkOpen in class DelegatingConnection

Throws:

SQLException

close

public void close()
           throws SQLException

Description copied from class: DelegatingConnection

Closes the underlying connection, and close any Statements that were not explicitly closed.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Connection

Overrides:

close in class DelegatingConnection

Throws:

SQLException

transactionComplete

protected void transactionComplete()

setAutoCommit

public void setAutoCommit(boolean autoCommit)
                   throws SQLException

Specified by:

setAutoCommit in interface Connection

Overrides:

setAutoCommit in class DelegatingConnection

Throws:

SQLException

commit

public void commit()
            throws SQLException

Specified by:

commit in interface Connection

Overrides:

commit in class DelegatingConnection

Throws:

SQLException

rollback

public void rollback()
              throws SQLException

Specified by:

rollback in interface Connection

Overrides:

rollback in class DelegatingConnection

Throws:

SQLException

setReadOnly

public void setReadOnly(boolean readOnly)
                 throws SQLException

Specified by:

setReadOnly in interface Connection

Overrides:

setReadOnly in class DelegatingConnection

Throws:

SQLException

isAccessToUnderlyingConnectionAllowed

public boolean isAccessToUnderlyingConnectionAllowed()

If false, getDelegate() and getInnermostDelegate() will return null.

Returns:

if false, getDelegate() and getInnermostDelegate() will return null

getDelegate

public Connection getDelegate()

Description copied from class: DelegatingConnection

Returns my underlying Connection.

Overrides:

getDelegate in class DelegatingConnection

Returns:

my underlying Connection.

getInnermostDelegate

public Connection getInnermostDelegate()

Description copied from class: DelegatingConnection

If my underlying Connection is not a DelegatingConnection, returns it, otherwise recursively invokes this method on my delegate.

Hence this method will return the first delegate that is not a DelegatingConnection, or null when no non-DelegatingConnection delegate can be found by traversing this chain.

This method is useful when you may have nested DelegatingConnections, and you want to make sure to obtain a "genuine" Connection.

Overrides:

getInnermostDelegate in class DelegatingConnection