/**
* Flushes the value caches of the specified entities along with all of the relevant relations
* cache entries. This should be called after a process outside of AO control may have modified
* the values in the specified rows. This does not actually remove the entity instances themselves
* from the instance cache. Rather, it just flushes all of their internally cached values (with
* the exception of the primary key).
*/
public void flush(RawEntity<?>... entities) {
List<Class<? extends RawEntity<?>>> types =
new ArrayList<Class<? extends RawEntity<?>>>(entities.length);
Map<RawEntity<?>, EntityProxy<?, ?>> toFlush = new HashMap<RawEntity<?>, EntityProxy<?, ?>>();
proxyLock.readLock().lock();
try {
for (RawEntity<?> entity : entities) {
verify(entity);
types.add(entity.getEntityType());
toFlush.put(entity, proxies.get(entity));
}
} finally {
proxyLock.readLock().unlock();
}
for (Entry<RawEntity<?>, EntityProxy<?, ?>> entry : toFlush.entrySet()) {
entry.getValue().flushCache(entry.getKey());
}
relationsCache.remove(types.toArray(new Class[types.size()]));
}
/**
* Deletes the specified entities from the database. DELETE statements are called on the rows in
* the corresponding tables and the entities are removed from the instance cache. The entity
* instances themselves are not invalidated, but it doesn't even make sense to continue using the
* instance without a row with which it is paired.
*
* <p>This method does attempt to group the DELETE statements on a per-type basis. Thus, if you
* pass 5 instances of <code>EntityA</code> and two instances of <code>EntityB</code>, the
* following SQL prepared statements will be invoked:
*
* <pre>DELETE FROM entityA WHERE id IN (?,?,?,?,?);
* DELETE FROM entityB WHERE id IN (?,?);</pre>
*
* <p>Thus, this method scales very well for large numbers of entities grouped into types.
* However, the execution time increases linearly for each entity of unique type.
*
* @param entities A varargs array of entities to delete. Method returns immediately if length ==
* 0.
*/
@SuppressWarnings("unchecked")
public void delete(RawEntity<?>... entities) throws SQLException {
if (entities.length == 0) {
return;
}
Map<Class<? extends RawEntity<?>>, List<RawEntity<?>>> organizedEntities =
new HashMap<Class<? extends RawEntity<?>>, List<RawEntity<?>>>();
for (RawEntity<?> entity : entities) {
verify(entity);
Class<? extends RawEntity<?>> type = getProxyForEntity(entity).getType();
if (!organizedEntities.containsKey(type)) {
organizedEntities.put(type, new LinkedList<RawEntity<?>>());
}
organizedEntities.get(type).add(entity);
}
entityCacheLock.writeLock().lock();
try {
DatabaseProvider provider = getProvider();
Connection conn = provider.getConnection();
try {
for (Class<? extends RawEntity<?>> type : organizedEntities.keySet()) {
List<RawEntity<?>> entityList = organizedEntities.get(type);
StringBuilder sql = new StringBuilder("DELETE FROM ");
tableNameConverterLock.readLock().lock();
try {
sql.append(provider.processID(tableNameConverter.getName(type)));
} finally {
tableNameConverterLock.readLock().unlock();
}
sql.append(" WHERE ")
.append(provider.processID(Common.getPrimaryKeyField(type, getFieldNameConverter())))
.append(" IN (?");
for (int i = 1; i < entityList.size(); i++) {
sql.append(",?");
}
sql.append(')');
Logger.getLogger("net.java.ao").log(Level.INFO, sql.toString());
PreparedStatement stmt = conn.prepareStatement(sql.toString());
int index = 1;
for (RawEntity<?> entity : entityList) {
TypeManager.getInstance()
.getType((Class) entity.getEntityType())
.putToDatabase(this, stmt, index++, entity);
}
relationsCache.remove(type);
stmt.executeUpdate();
stmt.close();
}
} finally {
conn.close();
}
for (RawEntity<?> entity : entities) {
entityCache.remove(new CacheKey(Common.getPrimaryKeyValue(entity), entity.getEntityType()));
}
proxyLock.writeLock().lock();
try {
for (RawEntity<?> entity : entities) {
proxies.remove(entity);
}
} finally {
proxyLock.writeLock().unlock();
}
} finally {
entityCacheLock.writeLock().unlock();
}
}
private void verify(RawEntity<?> entity) {
if (entity.getEntityManager() != this) {
throw new RuntimeException("Entities can only be used with a single EntityManager instance");
}
}
