Terracotta Ehcache 10.1 | Ehcache API Developer Guide | Transactions Support | Configuring it with XML
 
Configuring it with XML
You can create a XML file to configure a CacheManager, lookup a specific transaction manager and configure XA caches:

<service>
<tx:jta-tm transaction-manager-lookup-class=
"org.ehcache.transactions.xa.txmgr.btm.BitronixTransactionManagerLookup"/>
<!-- 1 -->
</service>

<cache alias="xaCache"> <!-- 2 -->
<key-type>java.lang.String</key-type>
<value-type>java.lang.String</value-type>
<heap unit="entries">20</heap>
<tx:xa-store unique-XAResource-id="xaCache" /> <!-- 3 -->
</cache>
1
Declare a TransactionManagerLookup that will lookup your transaction manager.
2
Configure a xaCache cache the normal way.
3
Configure xaCache as an XA cache, giving it xaCache as its unique XAResource ID.
In order to parse an XML configuration, you can use the XmlConfiguration type:

BitronixTransactionManager transactionManager =
TransactionManagerServices.getTransactionManager(); // 1

URL myUrl = this.getClass().getResource("/docs/configs/xa-getting-started.xml");
// 2
Configuration xmlConfig = new XmlConfiguration(myUrl); // 3
CacheManager myCacheManager = CacheManagerBuilder.newCacheManager(xmlConfig);
// 4
myCacheManager.init();

myCacheManager.close();
transactionManager.shutdown();
1
The Bitronix transaction manager must be started before the cache manager is initialized.
2
Create a URL to your XML file's location.
3
Instantiate a XmlConfiguration passing it the XML file's URL.
4
Using the staticorg.ehcache.config.builders.CacheManagerBuilder.newCacheManager ( org.ehcache.config.Configuration ) lets you create your CacheManager instance using the Configuration from the XmlConfiguration.
And here is what the BitronixTransactionManagerLookup implementation looks like:
public class BitronixTransactionManagerLookup
implements TransactionManagerLookup { // 1

private static final Logger LOGGER = LoggerFactory.getLogger(
BitronixTransactionManagerLookup.class);

@Override
public TransactionManagerWrapper lookupTransactionManagerWrapper() { // 2
if (!TransactionManagerServices.isTransactionManagerRunning()) { // 3
throw new IllegalStateException("BTM must be started beforehand");
}
TransactionManagerWrapper tmWrapper = new TransactionManagerWrapper(
TransactionManagerServices.getTransactionManager(),
new BitronixXAResourceRegistry()); // 4
LOGGER.info("Using looked up transaction manager : {}", tmWrapper);
return tmWrapper;
}
}
1
The TransactionManagerLookup interface must be implemented and the offer a no-arg constructor.
2
The lookupTransactionManagerWrapper() method must return a TransactionManagerWrapper instance.
3
Here is the check that makes sure BTM is started.
4
The TransactionManagerWrapper class is constructed with both the javax.transaction.TransactionManager instance as well as a XAResourceRegistryinstance. The latter is used to register the javax.transaction.xa.XAResource instances of the cache with the transaction manager using an implementation-specific mechanism. If your JTA implementation doesn't require that, you can use the NullXAResourceRegistryinstead.

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