org.infinispan.hotrod.transaction.lookup.GenericTransactionManagerLookup Maven / Gradle / Ivy

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package org.infinispan.hotrod.transaction.lookup;

import jakarta.transaction.TransactionManager;

import org.infinispan.commons.tx.lookup.LookupNames;
import org.infinispan.commons.tx.lookup.TransactionManagerLookup;
import org.infinispan.hotrod.transaction.manager.RemoteTransactionManager;

import net.jcip.annotations.GuardedBy;

/**
 * A {@link TransactionManagerLookup} implementation that attempts to locate a {@link TransactionManager}.
 * 
 * A variety of different classes and JNDI locations are tried, for servers such as: 
  JBoss 
 JRun4 

 * Resin 
 Orion 
 JOnAS 
 BEA Weblogic 
 Websphere 4.0, 5.0, 5.1, 6.0 
 Sun, Glassfish .
 * 
 * If a transaction manager is not found, returns an {@link RemoteTransactionManager}.
 *
 * @since 14.0
 */
public class GenericTransactionManagerLookup implements TransactionManagerLookup {

   private static final GenericTransactionManagerLookup INSTANCE = new GenericTransactionManagerLookup();
   @GuardedBy("this")
   private TransactionManager transactionManager = null;

   private GenericTransactionManagerLookup() {
   }

   public static GenericTransactionManagerLookup getInstance() {
      return INSTANCE;
   }

   @Override
   public synchronized TransactionManager getTransactionManager() {
      if (transactionManager != null) {
         return transactionManager;
      }

      transactionManager = LookupNames.lookupKnownTransactionManagers(GenericTransactionManagerLookup.class.getClassLoader())
            .orElseGet(RemoteTransactionManager::getInstance);
      return transactionManager;
   }
}