JmsManagedConnection (JBoss Connector API) - JBoss 4.0.1 sp1 connector API Documentation 英文版文档

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org.jboss.resource.adapter.jms
Class JmsManagedConnection

java.lang.Object
  org.jboss.resource.adapter.jms.JmsManagedConnection

All Implemented Interfaces:: javax.jms.ExceptionListener, javax.resource.spi.ManagedConnection

public class JmsManagedConnection
extends Object
implements javax.resource.spi.ManagedConnection, javax.jms.ExceptionListener

Managed Connection, manages one or more JMS sessions.

Every ManagedConnection will have a physical JMSConnection under the hood. This may leave out several session, as specifyed in 5.5.4 Multiple Connection Handles. Thread safe semantics is provided

Hm. If we are to follow the example in 6.11 this will not work. We would have to use the SAME session. This means we will have to guard against concurrent access. We use a stack, and only allowes the handle at the top of the stack to do things.

As to transactions we some fairly hairy alternatives to handle: XA - we get an XA. We may now only do transaction through the XAResource, since a XASession MUST throw exceptions in commit etc. But since XA support implies LocatTransaction support, we will have to use the XAResource in the LocalTransaction class. LocalTx - we get a normal session. The LocalTransaction will then work against the normal session api.

An invokation of JMS MAY BE DONE in none transacted context. What do we do then? How much should we leave to the user???

One possible solution is to use transactions any way, but under the hood. If not LocalTransaction or XA has been aquired by the container, we have to do the commit in send and publish. (CHECK is the container required to get a XA every time it uses a managed connection? No its is not, only at creation!)

Does this mean that a session one time may be used in a transacted env, and another time in a not transacted.

Maybe we could have this simple rule:

If a user is going to use non trans:

mark that i ra deployment descr
Use a JmsProviderAdapter with non XA factorys
Mark session as non transacted (this defeats the purpose of specifying
trans attrinbutes in deploy descr NOT GOOD

From the JMS tutorial: "When you create a session in an enterprise bean, the container ignores the arguments you specify, because it manages all transactional properties for enterprise beans."

And further: "You do not specify a message acknowledgment mode when you create a message-driven bean that uses container-managed transactions. The container handles acknowledgment automatically."

On Session or Connection:

From Tutorial: "A JMS API resource is a JMS API connection or a JMS API session." But in the J2EE spec only connection is considered a resource.

Not resolved: connectionErrorOccurred: it is verry hard to know from the exceptions thrown if it is a connection error. Should we register an ExceptionListener and mark al handles as errounous? And then let them send the event and throw an exception?

Created: Tue Apr 10 13:09:45 2001

Version:: $Revision: 1.13 $
Author:: Peter Antman., Jason Dillon

Constructor Summary

JmsManagedConnection(JmsManagedConnectionFactory mcf, javax.resource.spi.ConnectionRequestInfo info, String user, String pwd)
          Create a JmsManagedConnection.

Method Summary

void addConnectionEventListener(javax.resource.spi.ConnectionEventListener l)
          Add a connection event listener.

void associateConnection(Object obj)
          Move a handler from one mc to this one.

void cleanup()
          Cleans up the, from the spec - The cleanup of ManagedConnection instance resets its client specific state.

void destroy()
          Destroy the physical connection.

Object getConnection(Subject subject, javax.resource.spi.ConnectionRequestInfo info)
          Get the physical connection handler.

protected javax.resource.spi.ConnectionRequestInfo getInfo()
          Get the request info for this connection.

javax.resource.spi.LocalTransaction getLocalTransaction()
          Get the location transaction for the connection.

PrintWriter getLogWriter()
          Get the log writer for this connection.

protected JmsManagedConnectionFactory getManagedConnectionFactory()
          Get the connection factory for this connection.

javax.resource.spi.ManagedConnectionMetaData getMetaData()
          Get the meta data for the connection.

protected javax.jms.Session getSession()
          Get the session for this connection.

protected String getUserName()
          Get the user name for this connection.

XAResource getXAResource()
          Get the XAResource for the connection.

void onException(javax.jms.JMSException exception)


void removeConnectionEventListener(javax.resource.spi.ConnectionEventListener l)
          Remove a connection event listener.

protected void removeHandle(JmsSession handle)
          Remove a handle from the handle map.

protected void sendEvent(javax.resource.spi.ConnectionEvent event)
          Send an event.

void setLogWriter(PrintWriter out)
          Set the log writer for this connection.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JmsManagedConnection

public JmsManagedConnection(JmsManagedConnectionFactory mcf,
                            javax.resource.spi.ConnectionRequestInfo info,
                            String user,
                            String pwd)
                     throws javax.resource.ResourceException

Create a JmsManagedConnection.
Parameters:: mcf -; info -; user -; pwd -
Throws:: javax.resource.ResourceException

Method Detail

getConnection

public Object getConnection(Subject subject,
                            javax.resource.spi.ConnectionRequestInfo info)
                     throws javax.resource.ResourceException

Get the physical connection handler.

This bummer will be called in two situations:

When a new mc has bean created and a connection is needed
When an mc has been fetched from the pool (returned in match*)

It may also be called multiple time without a cleanup, to support connection sharing.

Specified by:: getConnection in interface javax.resource.spi.ManagedConnection

Parameters:: subject -; info -
Returns:: A new connection object.
Throws:: javax.resource.ResourceException

destroy

public void destroy()
             throws javax.resource.ResourceException

Destroy the physical connection.

Specified by:: destroy in interface javax.resource.spi.ManagedConnection

Throws:: javax.resource.ResourceException - Could not property close the session and connection.

cleanup

public void cleanup()
             throws javax.resource.ResourceException

Cleans up the, from the spec - The cleanup of ManagedConnection instance resets its client specific state. Does that mean that autentication should be redone. FIXME

Specified by:: cleanup in interface javax.resource.spi.ManagedConnection

Throws:: javax.resource.ResourceException

associateConnection

public void associateConnection(Object obj)
                         throws javax.resource.ResourceException

Move a handler from one mc to this one.

Specified by:: associateConnection in interface javax.resource.spi.ManagedConnection

Parameters:: obj - An object of type JmsSession.
Throws:: javax.resource.ResourceException - Failed to associate connection.; javax.resource.spi.IllegalStateException - ManagedConnection in an illegal state.

addConnectionEventListener

public void addConnectionEventListener(javax.resource.spi.ConnectionEventListener l)

Add a connection event listener.

Specified by:: addConnectionEventListener in interface javax.resource.spi.ManagedConnection

Parameters:: l - The connection event listener to be added.

removeConnectionEventListener

public void removeConnectionEventListener(javax.resource.spi.ConnectionEventListener l)

Remove a connection event listener.

Specified by:: removeConnectionEventListener in interface javax.resource.spi.ManagedConnection

Parameters:: l - The connection event listener to be removed.

getXAResource

public XAResource getXAResource()
                         throws javax.resource.ResourceException

Get the XAResource for the connection.

Specified by:: getXAResource in interface javax.resource.spi.ManagedConnection

Returns:: The XAResource for the connection.
Throws:: javax.resource.ResourceException - XA transaction not supported

getLocalTransaction

public javax.resource.spi.LocalTransaction getLocalTransaction()
                                                        throws javax.resource.ResourceException

Get the location transaction for the connection.

Specified by:: getLocalTransaction in interface javax.resource.spi.ManagedConnection

Returns:: The local transaction for the connection.
Throws:: javax.resource.ResourceException

getMetaData

public javax.resource.spi.ManagedConnectionMetaData getMetaData()
                                                         throws javax.resource.ResourceException

Get the meta data for the connection.

Specified by:: getMetaData in interface javax.resource.spi.ManagedConnection

Returns:: The meta data for the connection.
Throws:: javax.resource.ResourceException; javax.resource.spi.IllegalStateException - ManagedConnection already destroyed.

setLogWriter

public void setLogWriter(PrintWriter out)
                  throws javax.resource.ResourceException

Set the log writer for this connection.

Specified by:: setLogWriter in interface javax.resource.spi.ManagedConnection

Parameters:: out - The log writer for this connection.
Throws:: javax.resource.ResourceException

getLogWriter

public PrintWriter getLogWriter()
                         throws javax.resource.ResourceException

Get the log writer for this connection.

Specified by:: getLogWriter in interface javax.resource.spi.ManagedConnection

Returns:: Always null
Throws:: javax.resource.ResourceException

onException

public void onException(javax.jms.JMSException exception)

Specified by:: onException in interface javax.jms.ExceptionListener

getSession

protected javax.jms.Session getSession()

Get the session for this connection.

Returns:: Either a topic or queue connection.

sendEvent

protected void sendEvent(javax.resource.spi.ConnectionEvent event)

Send an event.

Parameters:: event - The event to send.

removeHandle

protected void removeHandle(JmsSession handle)

Remove a handle from the handle map.

Parameters:: handle - The handle to remove.

getInfo

protected javax.resource.spi.ConnectionRequestInfo getInfo()

Get the request info for this connection.

Returns:: The request info for this connection.

getManagedConnectionFactory

protected JmsManagedConnectionFactory getManagedConnectionFactory()

Get the connection factory for this connection.

Returns:: The connection factory for this connection.

getUserName

protected String getUserName()

Get the user name for this connection.

Returns:: The user name for this connection.