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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ambari.server.state.services;
import java.util.concurrent.TimeUnit;
import org.apache.ambari.annotations.Experimental;
import org.apache.ambari.annotations.ExperimentalFeature;
import org.apache.ambari.server.AmbariService;
import org.apache.ambari.server.configuration.Configuration;
import org.apache.ambari.server.orm.dao.AlertsDAO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.util.concurrent.AbstractScheduledService;
import com.google.inject.Inject;
/**
* The {@link CachedAlertFlushService} is used to periodically flush cached
* alert data to the database. This service is controlled by
* {@link Configuration#isAlertCacheEnabled()} and
* {@link Configuration#getAlertCacheFlushInterval()}.
*/
@AmbariService
@Experimental(feature = ExperimentalFeature.ALERT_CACHING)
public class CachedAlertFlushService extends AbstractScheduledService {
/**
* Logger.
*/
private final static Logger LOG = LoggerFactory.getLogger(CachedAlertFlushService.class);
/**
* Configuration.
*/
@Inject
private Configuration m_configuration;
/**
* Used for flushing cached entities to the database.
*/
@Inject
private AlertsDAO m_alertsDAO;
/**
* {@inheritDoc}
*/
@Override
protected Scheduler scheduler() {
int flushIntervalInMinutes = m_configuration.getAlertCacheFlushInterval();
return Scheduler.newFixedDelaySchedule(flushIntervalInMinutes, flushIntervalInMinutes,
TimeUnit.MINUTES);
}
/**
* {@inheritDoc}
* <p/>
* Invokes {@link #stop()} if not enabled.
*/
@Override
protected void startUp() throws Exception {
boolean enabled = m_configuration.isAlertCacheEnabled();
if (!enabled) {
stop();
}
}
/**
* {@inheritDoc}
* <p/>
* Flushes cached alerts to the database.
*/
@Override
protected void runOneIteration() throws Exception {
try {
LOG.info("Flushing cached alerts to the database");
m_alertsDAO.flushCachedEntitiesToJPA();
} catch (Exception exception) {
LOG.error("Unable to flush cached alerts to the database", exception);
}
}
}
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