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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.orm.toplink

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.springframework.orm.toplink .SessionReadCallback

SessionReadCallback

abstract public class SessionReadCallback implements TopLinkCallback(Code)

Convenient abstract implementation of the TopLinkCallback interface, exposing either the plain TopLink Session or the TopLink UnitOfWork (which extends the Session interface) to code that reads persistent objects.

Exposes the UnitOfWork if there is an active one (that is, if we're running within a non-read-only transaction); else exposes the Session itself. This allows to modify returned objects within a transaction, which is often desired, while the same code will return shared cache objects if running outside a transaction.

If "enforceReadOnly" is demanded, the callback will always expose the Session itself, avoiding the UnitOfWork overhead in any case.
author:
   Juergen Hoeller
since:
   1.2
See Also:   oracle.toplink.sessions.Session.getActiveUnitOfWork
See Also:   SessionReadCallback.readFromSession(oracle.toplink.sessions.Session)

Constructor Summary
public	SessionReadCallback() Create a new SessionReadCallback, not enforcing read-only objects.
public	SessionReadCallback(boolean enforceReadOnly) Create a new SessionReadCallback, enforcing read-only objects if demanded.

Method Summary
final public Object	doInTopLink(Session session) Determines the Session to work on (either the active UnitOfWork or the plain Session) and delegates to `readFromSession`.
abstract protected Object	readFromSession(Session session) Called with a Session to work on, either the active UnitOfWork or the plain Session (as determined by the transaction status).

Constructor Detail

SessionReadCallback
public SessionReadCallback()(Code)
	Create a new SessionReadCallback, not enforcing read-only objects.

SessionReadCallback
public SessionReadCallback(boolean enforceReadOnly)(Code)
	Create a new SessionReadCallback, enforcing read-only objects if demanded. Parameters: enforceReadOnly - whether to enforce returning read-only objects,even if running within a non-read-only transaction

Method Detail

doInTopLink
final public Object doInTopLink(Session session) throws TopLinkException(Code)
	Determines the Session to work on (either the active UnitOfWork or the plain Session) and delegates to `readFromSession`. See Also: SessionReadCallback.readFromSession(oracle.toplink.sessions.Session)

readFromSession
abstract protected Object readFromSession(Session session) throws TopLinkException(Code)
	Called with a Session to work on, either the active UnitOfWork or the plain Session (as determined by the transaction status). Parameters: session - the TopLink Session to perform read operations on a result object, or `null` if none throws: TopLinkException - in case of TopLink errors

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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