Examples of org.jboss.cache.loader.CacheLoader.prepare()

org.jboss.cache.loader.CacheLoader.prepare()

Prepares a list of modifications. For example, for a DB-based CacheLoader:

Create a local (JDBC) transaction
Associate the local transaction with tx (tx is the key)
Execute the corresponding SQL statements against the DB (statements derived from modifications)

For non-transactional CacheLoader (e.g. file-based), the implementation could attempt to implement its own transactional logic, attempting to write data to a temp location (or memory) and writing it to the proper location upon commit. @param tx The transaction, indended to be used by implementations as an identifier of the transaction (and not necessarily a JTA {@link javax.transaction.Transaction} object) @param modifications A {@link List} containing {@link org.jboss.cache.Modification}s, for the given transaction @param one_phase Persist immediately and (for example) commit the local JDBC transaction as well. When true,we won't get a {@link #commit(Object)} or {@link #rollback(Object)} method call later @throws Exception

         throws Exception
   {
      CacheLoader loader = loaderTL.get();


      List<Modification> mods = createUpdates();
      loader.prepare(null, mods, true);
      checkModifications(mods);
   }


   /**
    * Tests a two-phase transaction.

   {
      CacheLoader loader = loaderTL.get();


      Object txnKey = new Object();
      List<Modification> mods = createUpdates();
      loader.prepare(txnKey, mods, false);
      //      try {
      //         checkModifications(mods);
      //         // fail("Expected lock timeout");
      //      } catch (DeadlockException expected) {}
      loader.commit(txnKey);

      os.close();
      int num = baos.size();


      Object txnKey = new Object();
      List<Modification> mods = createUpdates();
      loader.prepare(txnKey, mods, false);
      loader.rollback(txnKey);


      baos = new ByteArrayOutputStream(1024);
      os = new MarshalledValueOutputStream(baos);
      loader.loadEntireState(os);

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