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From conflue...@apache.org
Subject [CONF] Apache Geronimo v2.1: Connectors and Transaction Management (JDBC, JMS, J2CA, DataSource, Connection Pool, EIS) (page created)
Date Tue, 10 Jun 2008 20:53:00 GMT
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Created :
            <a href="http://cwiki.apache.org/confluence/display/GMOxDOC21">GMOxDOC21</a>
:
            <a href="http://cwiki.apache.org/confluence/display/GMOxDOC21/Connectors+and+Transaction+Management+%28JDBC%2C+JMS%2C+J2CA%2C+DataSource%2C+Connection+Pool%2C+EIS%29">Connectors
and Transaction Management (JDBC, JMS, J2CA, DataSource, Connection Pool, EIS)</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/GMOxDOC21/Connectors+and+Transaction+Management+%28JDBC%2C+JMS%2C+J2CA%2C+DataSource%2C+Connection+Pool%2C+EIS%29">Connectors
and Transaction Management (JDBC, JMS, J2CA, DataSource, Connection Pool, EIS)</a>
        has been created by             <a href="http://cwiki.apache.org/confluence/display/~djencks">David
Jencks</a>
            <span class="smallfont">(Jun 10, 2008)</span>.
     </p>

    <span class="label">Content:</span><br />
    <div class="greybox wiki-content"><h1><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-Overview"></a>Overview</h1>
<p>Inbound and outbound connections in Geronimo are managed through the J2CA connector
framework.  This covers JDBC, JMS, DataSources, EIS connectivity, and connection pools. JDBC
connectivity is implemented by wrapping JDBC XADataSource, ConnectionPoolDataSource, DataSource,
or Driver implementations in J2CA connector wrappers.  The wrappers we use are from the codehaus
Tranql project. </p>

<h1><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-TransactionManager"></a>Transaction
Manager</h1>
<p>Applications can delegate transaction management to the server infrastructure through
application managed UserTransactions or for ejbs container manager transactions.  The server
uses a transaction manager to coordinate this application view of transaction boundaries with
the resource manager view of work done on specific data stores within particular transactions.
Geronimo uses a JTA TransactionManager implementation that is extended in three ways:</p>
<ol>
	<li>Transaction inflow as required by the J2CA inbound connector requirements</li>
	<li>Pluggable transaction logging, by default using HOWL (High speed ObjectWeb Logger)
for recoverable transaction managers in a server and a non-logging "logger" in application
clients</li>
	<li>Incremental recovery of in doubt transactions as connectors start up after a failure.
This allows transactions that use a subset of the deployed connectors to be recovered completely
as soon as the connectors they use are restarted, even if some other resource managers are
not yet available.
<h2><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-RequirementsforXAResourceimplementationstoenablerecovery"></a>Requirements
for XAResource implementations to enable recovery</h2>
<p>The XA spec does not provide any way to identify which XAResource an xid in an in-doubt
transaction is associated with.  In order for recovery to work without this information there
needs to be a global registry of all resource managers, and recovery can only start after
all resource managers are started and connected to the transaction manager. In order to avoid
the need for this kind of permanent registry and reliance on the complete environment being
present, geronimo associates each xid with the XAResource it is used with.  This is done by
requiring every XAResource to have a name, by implementing NamedXAResource (a geronimo interface).
Also, each connector (or other "source" of an XAResource) is required to register the NamedXAResource
with the transaction manager when it starts. The name is stored with the xid, so recovery
of a particular transaction can complete as soon as all the XAResources used in that particular
transaction have registered.<br/>
The name supplied by a NamedXAResource must be stable over restarts and unique to the resource
manager.  In geronimo we use the gbean name of the ManagedConnectionFactoryWrapper for outbound
connections and the ResourceAdapter gbean name for inbound connectors.</p>
<h2><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-Configuringtheidentityofthetransactionmanager."></a>Configuring
the identity of the transaction manager.</h2>
<p>If you are running more than one geronimo instance against a resource manager such
as an XADatabase, you need to make sure that the resource manager can distinguish which geronimo
instance is making each request.  You do this by setting the transaction manager identity.
 See <span class="nobr"><a href="/confluence/pages/createpage.action?spaceKey=GMOxDOC21&amp;title=Configuring%2Bthe%2BTransaction%2BManager%2BIdentity&amp;linkCreation=true&amp;fromPageId=87985"
title="Create Page: Configuring+the+Transaction+Manager+Identity" class="createlink">Configuring&#43;the&#43;Transaction&#43;Manager&#43;Identity<sup><img
class="rendericon" src="/confluence/images/icons/plus.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span></p></li>
</ol>


<h1><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-ConnectorFramework"></a>Connector
Framework</h1>
<p>The J2CA connector spec provides a reasonable approach to configuring and pooling
outbound connections and configuring and managing inbound message delivery.  Geronimo uses
this for jdbc connection support by wrapping jdbc artifacts in the required J2CA artifacts,
using the tranql project wrappers.</p>
<h2><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-ConnectionPooling%28outboundconnectors%29"></a>Connection
Pooling (outbound connectors)</h2>
<p>Often connections to legacy EIS systems and databases have connections that are extremely
expensive to set up.  Rather than creating a new connection to the external system every time
one is needed, normally you use a connection pool: when a connection is needed an unused connection
is supplied from the pool, and when the application is done with it the connection is put
back in the pool.  The J2CA spec supports this idea with these components:</p>
<h3><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-ConnectionFactory"></a>Connection
Factory</h3>
<p>A connection factory (e.g. DataSource) is a component used by an application to get
"connections" it can use.  These connections are short lived, lightweight handles or wrappers
to underlying "physical" managed connections.  When an application calls datasource.getConnection(),
the connection factory routes the request to the connection manager, which supplies a suitable
connection handle from a cached, pooled, or new connection.</p>
<h3><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-ConnectionManager"></a>ConnectionManager</h3>
<p>The connection manager received connection requests from the connection factory and
figures out how to accomodate them.  It also receives notification of transaction events and
transfer of control between application components such as ejbs.<br/>
Generally, if there is a cached ManagedConnection in the environment, the connection manager
returns a new handle to the cached ManagedConnection.  Otherwise it looks for a suitable ManagedConnection
in the pool, and returns a handle to such a connection if it exists.  Otherwise it creates
a new connection.</p>
<h4><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-Transactionsupport"></a>Transaction
support</h4>
<p>Connection managers in geronimo can be configured with xa, local, or no transaction
support.  </p>
<h5><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-Notransaction"></a>No
transaction</h5>
<p>No Transaction support means that connections are never enrolled in jta transactions
and committing such a jta transaction has no effect on any connections managed by the connection
manager.  In this case the connection manager does no caching and each connection request
is handled independently.</p>
<h5><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-Localtransaction"></a>Local
transaction</h5>
<p>Local transaction support relies on the connector support of j2ca local transaction
control.  This maps to such things as non-xa jdbc Driver, DataSource, and ConnectionPoolDataSource
implementations.  In this case geronimo constructs a "fake" XAResource that enables the JTA
transaction manager to control the local transaction, however xa features such as separation
of prepare and commit phases and recovery are not implemented.  Since the resource manager
has no transaction identifier that lets it distinguish which transaction work is being done
on, the connection manager has to keep track of this by caching all the connections enrolled
in a jta transaction.  Whenever your application requests a connection while in a jta transaction,
the connection manager checks for an existing connection enrolled in this transaction and
if found supplies an additional handle to it.  If no connection is associated, one is fetched
from the pool (or created anew) and cached with the transaction.  Furthermore, closing one
or all of these connection handles will not result in returning the connection to the pool.
 The connection is returned to the pool only when all the handles have been closed and the
jta transaction completes.</p>
<h5><a name="ConnectorsandTransactionManagement%28JDBC%2CJMS%2CJ2CA%2CDataSource%2CConnectionPool%2CEIS%29-XAtransaction"></a>XA
transaction</h5>
<p>XA transaction support should theoretically not require caching connections with
transactions but in practice usually does.  The XA spec indicates that any connection should
be able to handle work in any transaction at any time, but few if any XA capable resource
managers actually implement this.  Normally you must do all work in a JTA transaction against
a given resource manager over the same physical connection.  Setting transaction-caching on
will assure that this caching takes place.  <br/>
The intent of the enlist/delist methods on XAResource appears to be to support reusing a connection
in a thread as it enters and leaves "Requires New" transaction boundaries.  By default geronimo
does not attempt to reuse connections in this way: the connections associated with the previous
transaction are left associated with it and new connection requests get new ManagedConnections
from the pool. There is an experimental configuration to reuse the connections already associated
with the thread.</p>


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