Post office web site - APPENDIX A n MORE ADVANCED FEATURES 259 n
APPENDIX A n MORE ADVANCED FEATURES 259 n MORE ADVANCED FEATURES 259 Transaction tx = session.beginTransaction(); // Make our bookings… session.save(new Booking(”dave”,”F1″)); session.save(new Booking(”jeff”,”C3″)); // The confirmation letters should not be sent // out until AFTER the commit completes. tx.commit(); } } The interceptor that we are applying is going to capture the information from the Booking objects that we are storing in the database. Listing A-26 demonstrates the basic mechanism, but it is only a toy example. We will discuss some of its deficiencies in a moment. Listing A-26. An Interceptor Implementation package com.hibernatebook.advanced.events; import java.io.Serializable; import java.util.Collection; import java.util.HashSet; import java.util.Iterator; import org.hibernate.CallbackException; import org.hibernate.EntityMode; import org.hibernate.Interceptor; import org.hibernate.Transaction; import org.hibernate.type.Type; public class BookingInterceptor implements Interceptor { public BookingInterceptor() { } private ThreadLocal stored = new ThreadLocal(); public void afterTransactionBegin(Transaction tx) { stored.set(new HashSet()); } public void afterTransactionCompletion(Transaction tx) { if (tx.wasCommitted()) { Iterator i = ((Collection) stored.get()).iterator();
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