/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see http://www.gnu.org/licenses/. */
package com.db4o.internal.events;
import com.db4o.*;
import com.db4o.events.*;
import com.db4o.ext.*;
import com.db4o.internal.*;
import com.db4o.internal.callbacks.*;
import com.db4o.query.*;
/**
* @exclude
*/
public class EventRegistryImpl implements Callbacks, EventRegistry {
protected final Event4Impl _queryStarted = new Event4Impl();
protected final Event4Impl _queryFinished = new Event4Impl();
protected final Event4Impl _creating = new Event4Impl();
protected final Event4Impl _activating = new Event4Impl();
protected final Event4Impl _updating = new Event4Impl();
protected final Event4Impl _deleting = new Event4Impl();
protected final Event4Impl _deactivating = new Event4Impl();
protected final Event4Impl _created = new Event4Impl();
protected final Event4Impl _activated = new Event4Impl();
protected final Event4Impl _updated = new Event4Impl();
protected final Event4Impl _deleted = new Event4Impl();
protected final Event4Impl _deactivated = new Event4Impl();
protected final Event4Impl _committing = new Event4Impl();
protected final Event4Impl _committed = new CommittedEvent();
protected final Event4Impl _instantiated = new Event4Impl();
protected final Event4Impl _classRegistered = new Event4Impl();
protected final Event4Impl _closing = new Event4Impl();
protected final Event4Impl _opened = new Event4Impl();
private boolean _inCallback = false;
/**
* @sharpen.ignore
*/
protected class CommittedEvent extends Event4Impl {
protected void onListenerAdded() {
onCommittedListenerAdded();
}
}
// Callbacks implementation
public void queryOnFinished(final Transaction transaction, final Query query) {
if (!_queryFinished.hasListeners())
return;
withExceptionHandling(new Runnable() { public void run() {
_queryFinished.trigger(new QueryEventArgs(transaction, query));
}});
}
public void queryOnStarted(final Transaction transaction, final Query query) {
if (!_queryStarted.hasListeners())
return;
withExceptionHandling(new Runnable() { public void run() {
_queryStarted.trigger(new QueryEventArgs(transaction, query));
}});
}
public boolean objectCanNew(Transaction transaction, Object obj) {
return triggerCancellableObjectEventArgsInCallback(transaction, _creating, null, obj);
}
public boolean objectCanActivate(Transaction transaction, Object obj) {
return triggerCancellableObjectEventArgsInCallback(transaction, _activating, null, obj);
}
public boolean objectCanUpdate(Transaction transaction, ObjectInfo objectInfo) {
return triggerCancellableObjectEventArgsInCallback(transaction, _updating, objectInfo, objectInfo.getObject());
}
public boolean objectCanDelete(Transaction transaction, ObjectInfo objectInfo) {
return triggerCancellableObjectEventArgsInCallback(transaction, _deleting, objectInfo, objectInfo.getObject());
}
public boolean objectCanDeactivate(Transaction transaction, ObjectInfo objectInfo) {
return triggerCancellableObjectEventArgsInCallback(transaction, _deactivating, objectInfo, objectInfo.getObject());
}
public void objectOnActivate(Transaction transaction, ObjectInfo obj) {
triggerObjectInfoEventInCallback(transaction, _activated, obj);
}
public void objectOnNew(Transaction transaction, ObjectInfo obj) {
triggerObjectInfoEventInCallback(transaction, _created, obj);
}
public void objectOnUpdate(Transaction transaction, ObjectInfo obj) {
triggerObjectInfoEventInCallback(transaction, _updated, obj);
}
public void objectOnDelete(Transaction transaction, ObjectInfo obj) {
triggerObjectInfoEventInCallback(transaction, _deleted, obj);
}
public void classOnRegistered(final ClassMetadata clazz) {
if (!_classRegistered.hasListeners())
return;
withExceptionHandling(new Runnable() { public void run() {
_classRegistered.trigger(new ClassEventArgs(clazz));
}});
}
public void objectOnDeactivate(Transaction transaction, ObjectInfo obj) {
triggerObjectInfoEventInCallback(transaction, _deactivated, obj);
}
public void objectOnInstantiate(Transaction transaction, ObjectInfo obj) {
triggerObjectInfoEventInCallback(transaction, _instantiated, obj);
}
public void commitOnStarted(final Transaction transaction, final CallbackObjectInfoCollections objectInfoCollections) {
if (!_committing.hasListeners())
return;
withExceptionHandlingInCallback(new Runnable() {
public void run() {
_committing.trigger(new CommitEventArgs(transaction, objectInfoCollections, false));
}
});
}
public void commitOnCompleted(final Transaction transaction, final CallbackObjectInfoCollections objectInfoCollections, final boolean isOwnCommit) {
if (!_committed.hasListeners())
return;
withExceptionHandlingInCallback(new Runnable() {
public void run() {
_committed.trigger(new CommitEventArgs(transaction, objectInfoCollections, isOwnCommit));
}
});
}
public void closeOnStarted(final ObjectContainer container) {
if (!_closing.hasListeners())
return;
withExceptionHandlingInCallback(new Runnable() {
public void run() {
_closing.trigger(new ObjectContainerEventArgs(container));
}
});
}
public void openOnFinished(final ObjectContainer container) {
if (!_opened.hasListeners())
return;
withExceptionHandlingInCallback(new Runnable() {
public void run() {
_opened.trigger(new ObjectContainerEventArgs(container));
}
});
}
public Event4 queryFinished() {
return _queryFinished;
}
public Event4 queryStarted() {
return _queryStarted;
}
public Event4 creating() {
return _creating;
}
public Event4 activating() {
return _activating;
}
public Event4 updating() {
return _updating;
}
public Event4 deleting() {
return _deleting;
}
public Event4 deactivating() {
return _deactivating;
}
public Event4 created() {
return _created;
}
public Event4 activated() {
return _activated;
}
public Event4 updated() {
return _updated;
}
public Event4 deleted() {
return _deleted;
}
public Event4 deactivated() {
return _deactivated;
}
public Event4 committing() {
return _committing;
}
/**
* @sharpen.event.onAdd onCommittedListenerAdded
*/
public Event4 committed() {
return _committed;
}
public Event4 classRegistered() {
return _classRegistered;
}
public Event4 instantiated() {
return _instantiated;
}
public Event4 closing() {
return _closing;
}
protected void onCommittedListenerAdded() {
// do nothing
}
public boolean caresAboutCommitting() {
return _committing.hasListeners();
}
public boolean caresAboutCommitted() {
return _committed.hasListeners();
}
public boolean caresAboutDeleting() {
return _deleting.hasListeners();
}
public boolean caresAboutDeleted() {
return _deleted.hasListeners();
}
boolean triggerCancellableObjectEventArgsInCallback(final Transaction transaction, final Event4Impl<CancellableObjectEventArgs> e, final ObjectInfo objectInfo, final Object o) {
if (!e.hasListeners())
return true;
final CancellableObjectEventArgs args = new CancellableObjectEventArgs(transaction, objectInfo, o);
withExceptionHandlingInCallback(new Runnable() {
public void run() {
e.trigger(args);
}
});
return !args.isCancelled();
}
void triggerObjectInfoEventInCallback(final Transaction transaction, final Event4Impl<ObjectInfoEventArgs> e, final ObjectInfo o) {
if (!e.hasListeners())
return;
withExceptionHandlingInCallback(new Runnable() {
public void run() {
e.trigger(new ObjectInfoEventArgs(transaction, o));
}
});
}
private void withExceptionHandlingInCallback(final Runnable runnable) {
_inCallback = true;
try {
runnable.run();
} catch (Db4oException e) {
throw e;
} catch (Throwable x) {
throw new EventException(x);
} finally {
_inCallback = false;
}
}
private void withExceptionHandling(final Runnable runnable) {
try {
runnable.run();
} catch (Db4oException e) {
throw e;
} catch (Throwable x) {
throw new EventException(x);
}
}
public Event4<ObjectContainerEventArgs> opened() {
return _opened;
}
public static boolean inCallback(InternalObjectContainer container) {
if (container.callbacks() instanceof EventRegistryImpl) {
EventRegistryImpl er = (EventRegistryImpl) container.callbacks();
return er._inCallback;
}
return false;
}
}