/* ********************************************************************** **
** Copyright notice **
** **
** (c) 2005-2006 RSSOwl Development Team **
** http://www.rssowl.org/ **
** **
** All rights reserved **
** **
** This program and the accompanying materials are made available under **
** the terms of the Eclipse Public License v1.0 which accompanies this **
** distribution, and is available at: **
** http://www.rssowl.org/legal/epl-v10.html **
** **
** A copy is found in the file epl-v10.html and important notices to the **
** license from the team is found in the textfile LICENSE.txt distributed **
** in this package. **
** **
** This copyright notice MUST APPEAR in all copies of the file! **
** **
** Contributors: **
** RSSOwl Development Team - initial API and implementation **
** **
** ********************************************************************** */
package org.rssowl.core.model.internal.db4o;
import org.eclipse.core.runtime.Assert;
import org.rssowl.core.model.NewsModel;
import org.rssowl.core.model.dao.IModelDAO;
import org.rssowl.core.model.dao.PersistenceException;
import org.rssowl.core.model.events.AttachmentEvent;
import org.rssowl.core.model.events.BookMarkEvent;
import org.rssowl.core.model.events.CategoryEvent;
import org.rssowl.core.model.events.FeedEvent;
import org.rssowl.core.model.events.FolderEvent;
import org.rssowl.core.model.events.LabelEvent;
import org.rssowl.core.model.events.ModelEvent;
import org.rssowl.core.model.events.NewsEvent;
import org.rssowl.core.model.events.PersonEvent;
import org.rssowl.core.model.events.SearchConditionEvent;
import org.rssowl.core.model.events.SearchMarkEvent;
import org.rssowl.core.model.reference.AttachmentReference;
import org.rssowl.core.model.reference.BookMarkReference;
import org.rssowl.core.model.reference.CategoryReference;
import org.rssowl.core.model.reference.FeedLinkReference;
import org.rssowl.core.model.reference.FeedReference;
import org.rssowl.core.model.reference.FolderReference;
import org.rssowl.core.model.reference.LabelReference;
import org.rssowl.core.model.reference.NewsReference;
import org.rssowl.core.model.reference.PersonReference;
import org.rssowl.core.model.reference.SearchConditionReference;
import org.rssowl.core.model.reference.SearchMarkReference;
import org.rssowl.core.model.search.ISearchCondition;
import org.rssowl.core.model.types.IAttachment;
import org.rssowl.core.model.types.IBookMark;
import org.rssowl.core.model.types.ICategory;
import org.rssowl.core.model.types.ICloud;
import org.rssowl.core.model.types.IConditionalGet;
import org.rssowl.core.model.types.IEntity;
import org.rssowl.core.model.types.IFeed;
import org.rssowl.core.model.types.IFolder;
import org.rssowl.core.model.types.ILabel;
import org.rssowl.core.model.types.INews;
import org.rssowl.core.model.types.IPerson;
import org.rssowl.core.model.types.ISearchMark;
import org.rssowl.core.model.types.ITextInput;
import com.db4o.ObjectContainer;
import com.db4o.ObjectSet;
import com.db4o.ext.Db4oException;
import com.db4o.query.Query;
import java.net.URL;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
/**
* An implementation of IModelDAO that simply delegates all the functionality
* to DBManager.<p>
*
* @author Ismael Juma (ismael@juma.me.uk)
*/
public class ModelDAOImpl implements IModelDAO {
private ReadWriteLock fLock;
private Lock fWriteLock;
private ObjectContainer fDb;
/**
* Creates an instance of this class.
*/
public ModelDAOImpl() {
DBManager.getDefault().addEntityStoreListener(new DatabaseListener() {
public void databaseOpened(DatabaseEvent event) {
fDb = event.getObjectContainer();
fLock = event.getLock();
fWriteLock = fLock.writeLock();
}
public void databaseClosed(DatabaseEvent event) {
fDb = null;
}
});
}
private void deleteEntityAndFireEvents(ModelEvent event) {
DBHelper.putEventTemplate(event);
fWriteLock.lock();
try {
fDb.delete(event.getEntity());
fDb.commit();
} catch (Db4oException e) {
throw new PersistenceException(e);
} finally {
fWriteLock.unlock();
}
DBHelper.cleanUpAndFireEvents();
}
public final void deleteConditionalGet(IConditionalGet conditionalGet) {
fWriteLock.lock();
try {
fDb.delete(conditionalGet);
fDb.commit();
} catch (Db4oException e) {
throw new PersistenceException(e);
} finally {
fWriteLock.unlock();
}
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteBookMark(org.rssowl.core.model.reference.BookMarkReference)
*/
public final void deleteBookMark(BookMarkReference reference) throws PersistenceException {
IBookMark mark = loadBookMark(reference.getId());
BookMarkEvent event = new BookMarkEvent(mark, null, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteCategory(org.rssowl.core.model.reference.CategoryReference)
*/
public final void deleteCategory(CategoryReference reference) throws PersistenceException {
ICategory category = loadCategory(reference.getId());
CategoryEvent event = new CategoryEvent(category, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteFeed(org.rssowl.core.model.reference.FeedReference)
*/
public final void deleteFeed(FeedReference reference) throws PersistenceException {
IFeed feed = loadFeed(reference.getId());
FeedEvent event = new FeedEvent(feed, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteFeed(org.rssowl.core.model.reference.FeedLinkReference)
*/
public final void deleteFeed(FeedLinkReference reference) throws PersistenceException {
IFeed feed = NewsModel.getDefault().getPersistenceLayer().getApplicationLayer().loadFeed(reference.getLink());
FeedEvent event = new FeedEvent(feed, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteFolder(org.rssowl.core.model.reference.FolderReference)
*/
public final void deleteFolder(FolderReference reference) throws PersistenceException {
IFolder folder = loadFolder(reference.getId());
FolderEvent event = new FolderEvent(folder, null, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteLabel(org.rssowl.core.model.reference.LabelReference)
*/
public final void deleteLabel(LabelReference reference) throws PersistenceException {
ILabel label = loadLabel(reference.getId());
LabelEvent event = new LabelEvent(label, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteNews(org.rssowl.core.model.reference.NewsReference)
*/
public final void deleteNews(NewsReference reference) throws PersistenceException {
INews news = loadNews(reference.getId());
NewsEvent event = new NewsEvent(null, news, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteSearchMark(org.rssowl.core.model.reference.SearchMarkReference)
*/
public final void deleteSearchMark(SearchMarkReference reference) throws PersistenceException {
ISearchMark mark = loadSearchMark(reference.getId());
SearchMarkEvent event = new SearchMarkEvent(mark, null, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deletePerson(org.rssowl.core.model.reference.PersonReference)
*/
public void deletePerson(PersonReference reference) throws PersistenceException {
IPerson person = loadPerson(reference.getId());
PersonEvent event = new PersonEvent(person, true);
deleteEntityAndFireEvents(event);
}
public void deleteSearchCondition(SearchConditionReference reference) throws PersistenceException {
ISearchCondition searchCond = loadSearchCondition(reference.getId());
SearchConditionEvent event = new SearchConditionEvent(searchCond, true);
deleteEntityAndFireEvents(event);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#deleteAttachment(org.rssowl.core.model.reference.AttachmentReference)
*/
public void deleteAttachment(AttachmentReference reference) throws PersistenceException {
IAttachment attachment = loadAttachment(reference.getId());
AttachmentEvent event = new AttachmentEvent(attachment, true);
//TODO Not sure about this, but let's do it for now to help us track a bug
//in NewsService where never having a newsUpdated with a null oldNews is
//helpful
INews news = attachment.getNews();
INews oldNews = fDb.ext().peekPersisted(news, 2, true);
NewsEvent newsEvent = new NewsEvent(oldNews, news, false);
DBHelper.putEventTemplate(newsEvent);
deleteEntityAndFireEvents(event);
}
public final IConditionalGet loadConditionalGet(URL link) throws PersistenceException {
Assert.isNotNull(link, "link cannot be null"); //$NON-NLS-1$
try {
Query query = fDb.query();
query.constrain(ConditionalGet.class);
query.descend("fLink").constrain(link.toString()); //$NON-NLS-1$
@SuppressWarnings("unchecked")
ObjectSet<IConditionalGet> set = query.execute();
for (IConditionalGet entity : set) {
fDb.activate(entity, Integer.MAX_VALUE);
return entity;
}
} catch (Db4oException e) {
throw new PersistenceException(e);
}
return null;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadAttachment(long)
*/
public final IAttachment loadAttachment(long id) throws PersistenceException {
return loadEntity(IAttachment.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadBookMark(long)
*/
public IBookMark loadBookMark(long id) throws PersistenceException {
return loadEntity(IBookMark.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadCategory(long)
*/
public ICategory loadCategory(long id) throws PersistenceException {
return loadEntity(ICategory.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadCloud(long)
*/
public ICloud loadCloud(long id) throws PersistenceException {
// TODO If we don't implement this, what do we do? Return null or throw
// NotSupportedOperation?
return null;
}
public IFeed loadFeed(long id) throws PersistenceException {
IFeed feed = loadEntity(IFeed.class,id);
return feed;
}
private <T extends IEntity>T loadEntity(Class<T> klass, long id) {
try {
Query query = fDb.query();
query.constrain(klass);
query.descend("fId").constrain(Long.valueOf(id)); //$NON-NLS-1$
@SuppressWarnings("unchecked")
ObjectSet<T> set = query.execute();
for (T entity : set) {
// TODO Activate completely by default for now. Must decide how to deal
// with this.
fDb.activate(entity, Integer.MAX_VALUE);
return entity;
}
} catch (Db4oException e) {
throw new PersistenceException(e);
}
return null;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadFolder(long)
*/
public IFolder loadFolder(long id) throws PersistenceException {
return loadEntity(IFolder.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadLabel(long)
*/
public ILabel loadLabel(long id) throws PersistenceException {
return loadEntity(ILabel.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadNews(long)
*/
public INews loadNews(long id) throws PersistenceException {
return loadEntity(INews.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadPerson(long)
*/
public IPerson loadPerson(long id) throws PersistenceException {
return loadEntity(IPerson.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadSearchMark(long)
*/
public ISearchMark loadSearchMark(long id) throws PersistenceException {
return loadEntity(ISearchMark.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadSearchCondition(long)
*/
public ISearchCondition loadSearchCondition(long id) throws PersistenceException {
return loadEntity(ISearchCondition.class, id);
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#loadTextInput(long)
*/
public ITextInput loadTextInput(long id) throws PersistenceException {
// TODO If we don't implement this, what do we do? Return null or throw
// NotSupportedOperation?
return null;
}
private void saveAndCommit(ModelEvent event, boolean saveFully) {
saveAndCommit(event.getEntity(), saveFully);
}
private void saveAndCommit(Object entity, boolean saveFully) {
fWriteLock.lock();
try {
if (saveFully)
fDb.ext().set(entity, Integer.MAX_VALUE);
else
fDb.set(entity);
fDb.commit();
} catch (Db4oException e) {
throw new PersistenceException(e);
} finally {
fWriteLock.unlock();
}
}
private void saveCommitAndFireEvents(ModelEvent event, boolean activateFully) {
DBHelper.putEventTemplate(event);
saveAndCommit(event, activateFully);
DBHelper.cleanUpAndFireEvents();
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveBookMark(org.rssowl.core.model.types.IBookMark)
*/
public IBookMark saveBookMark(IBookMark bookMark) throws PersistenceException {
ModelEvent event = new BookMarkEvent(bookMark, null, true);
saveCommitAndFireEvents(event, false);
return bookMark;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveCategory(org.rssowl.core.model.types.ICategory)
*/
public ICategory saveCategory(ICategory category) throws PersistenceException {
ModelEvent event = new CategoryEvent(category, true);
saveCommitAndFireEvents(event, false);
return category;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveFeed(org.rssowl.core.model.types.IFeed)
*/
public IFeed saveFeed(IFeed feed) throws PersistenceException {
fWriteLock.lock();
try {
if (feed.getId() == null) {
if (DBHelper.feedExists(fDb, feed.getLink()))
throw new IllegalArgumentException("This feed already exists, but it has no id."); //$NON-NLS-1$
}
DBHelper.saveFeed(fDb, feed);
fDb.commit();
} catch (Db4oException e) {
throw new PersistenceException(e);
} finally {
fWriteLock.unlock();
}
DBHelper.cleanUpAndFireEvents();
return feed;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveFolder(org.rssowl.core.model.types.IFolder)
*/
public IFolder saveFolder(IFolder folder) throws PersistenceException {
FolderEvent event = new FolderEvent(folder, null, true);
saveCommitAndFireEvents(event, false);
return folder;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveLabel(org.rssowl.core.model.types.ILabel)
*/
public ILabel saveLabel(ILabel label) throws PersistenceException {
LabelEvent event = new LabelEvent(label, true);
saveCommitAndFireEvents(event, false);
return label;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveNews(org.rssowl.core.model.types.INews)
*/
public INews saveNews(INews news) throws PersistenceException {
INews oldNews = fDb.ext().peekPersisted(news, Integer.MAX_VALUE, true);
if (news.isIdentical(oldNews))
return news;
ModelEvent event = new NewsEvent(oldNews, news, true);
saveCommitAndFireEvents(event, false);
return news;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveSearchMark(org.rssowl.core.model.types.ISearchMark)
*/
public ISearchMark saveSearchMark(ISearchMark mark) throws PersistenceException {
SearchMarkEvent event = new SearchMarkEvent(mark, null, true);
saveCommitAndFireEvents(event, false);
return mark;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveCloud(org.rssowl.core.model.types.ICloud)
*/
public ICloud saveCloud(ICloud cloud) throws PersistenceException {
// TODO If we don't implement this, what do we do? Return null or throw
// NotSupportedOperation?
return null;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveTextInput(org.rssowl.core.model.types.ITextInput)
*/
public ITextInput saveTextInput(ITextInput textInput) throws PersistenceException {
// TODO If we don't implement this, what do we do? Return null or throw
// NotSupportedOperation?
return null;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveSearchCondition(org.rssowl.core.model.search.ISearchCondition)
*/
public ISearchCondition saveSearchCondition(ISearchCondition condition) throws PersistenceException {
SearchConditionEvent event = new SearchConditionEvent(condition, true);
saveCommitAndFireEvents(event, true);
return condition;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#saveAttachment(org.rssowl.core.model.types.IAttachment)
*/
public IAttachment saveAttachment(IAttachment attachment) throws PersistenceException {
AttachmentEvent event = new AttachmentEvent(attachment, true);
saveCommitAndFireEvents(event, false);
return attachment;
}
/*
* @see org.rssowl.core.model.dao.IModelDAO#savePerson(org.rssowl.core.model.types.IPerson)
*/
public IPerson savePerson(IPerson person) throws PersistenceException {
PersonEvent event = new PersonEvent(person, true);
saveCommitAndFireEvents(event, false);
return person;
}
public IConditionalGet saveConditionalGet(IConditionalGet conditionalGet) throws PersistenceException {
saveAndCommit(conditionalGet, true);
return conditionalGet;
}
}