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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022 Bell Canada
* Modification Copyright (C) 2022 Deutsche Telekom SA
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.rest.util;
import java.util.Iterator;
import org.janusgraph.core.JanusGraphException;
import org.janusgraph.core.JanusGraphTransaction;
import org.onap.aai.dbmap.AAIGraph;
import org.onap.aai.logging.ErrorLogHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import com.google.common.collect.Iterators;
/**
* Singleton class responsible to check that AAI service is able to connect to its back-end
* database.
*/
@Component
@Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)
public class AaiGraphChecker {
private static final Logger LOGGER = LoggerFactory.getLogger(AaiGraphChecker.class);
private AaiGraphChecker() {
}
/**
* Checks whether a connection to the graph database can be made.
*
* @return
* <li>true, if database is available</li>
* <li>false, if database is NOT available</li>
*/
public Boolean isAaiGraphDbAvailable() {
Boolean dbAvailable;
JanusGraphTransaction transaction = null;
try {
transaction = AAIGraph.getInstance().getGraph().newTransaction();
final Iterator<?> vertexIterator = transaction.query().limit(1).vertices().iterator();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Number of vertices retrieved while checking db: {}",
Iterators.size(vertexIterator));
}
vertexIterator.hasNext();
LOGGER.debug("Database is available");
dbAvailable = Boolean.TRUE;
} catch (JanusGraphException e) {
String message = "Database is not available (after JanusGraph exception)";
ErrorLogHelper.logError("500", message + ": " + e.getMessage());
LOGGER.error(message, e);
dbAvailable = Boolean.FALSE;
} catch (Error e) {
// Following error occurs when aai resources is starting:
// - UnsatisfiedLinkError (for org.onap.aai.dbmap.AAIGraph$Helper instantiation)
// Following errors are raised when aai resources is starting and cassandra is not
// running:
// - ExceptionInInitializerError
// - NoClassDefFoundError (definition for org.onap.aai.dbmap.AAIGraph$Helper is not
// found)
String message = "Database is not available (after error)";
ErrorLogHelper.logError("500", message + ": " + e.getMessage());
LOGGER.error(message, e);
dbAvailable = Boolean.FALSE;
} catch (Exception e) {
String message = "Database availability can not be determined";
ErrorLogHelper.logError("500", message + ": " + e.getMessage());
LOGGER.error(message, e);
dbAvailable = null;
} finally {
if (transaction != null && !transaction.isClosed()) {
// check if transaction is open then closed instead of flag
try {
transaction.rollback();
} catch (Exception e) {
String message = "Exception occurred while closing transaction";
LOGGER.error(message, e);
ErrorLogHelper.logError("500", message + ": " + e.getMessage());
}
}
}
return dbAvailable;
}
}
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