/**
* Copyright (c) 2009 - 2012 Red Hat, Inc.
*
* This software is licensed to you under the GNU General Public License,
* version 2 (GPLv2). There is NO WARRANTY for this software, express or
* implied, including the implied warranties of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
* along with this software; if not, see
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* Red Hat trademarks are not licensed under GPLv2. No permission is
* granted to use or replicate Red Hat trademarks that are incorporated
* in this software or its documentation.
*/
package org.candlepin.guice;
import org.candlepin.audit.EventSink;
import org.candlepin.common.exceptions.IseException;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.OutOfScopeException;
import com.google.inject.ProvisionException;
import com.google.inject.name.Names;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import javax.inject.Provider;
/**
* Provider which returns the correct event sink for the current context.
*
* Return either the request or pinsetter scoped event sink, which allows us to queue
* events and send them only if the request or job is successful.
*/
public class EventSinkProvider implements Provider<EventSink> {
private static Logger log = LoggerFactory.getLogger(EventSinkProvider.class);
private EventSink requestSink;
private EventSink pinsetterSink;
@Inject
public EventSinkProvider(Injector injector) {
// Guice doesn't surface any way to tell what scope you're in. So we just have to
// ask for the object and deal with any consequences if it isn't available.
try {
requestSink = injector.getInstance(Key.get(EventSink.class,
Names.named("RequestSink")));
}
catch (ProvisionException e) {
requestSink = null;
}
try {
pinsetterSink = injector.getInstance(Key.get(EventSink.class,
Names.named("PinsetterSink")));
}
catch (ProvisionException e) {
pinsetterSink = null;
}
}
@Override
public EventSink get() {
// These should not both be null, if so something is very wrong:
if (requestSink != null && pinsetterSink != null) {
log.error("Request sink and pinsetter sink are both non-null.");
throw new IseException("Scope configuration error.");
}
if (requestSink != null) {
return requestSink;
}
else if (pinsetterSink != null) {
return pinsetterSink;
}
else {
throw new OutOfScopeException("Not in PinsetterScope or ServletScope!");
}
}
}