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package org.openecomp.sdc.be.dao.janusgraph.transactions;
import org.janusgraph.core.JanusGraphException;
import org.janusgraph.core.JanusGraph;
import org.openecomp.sdc.be.dao.janusgraph.JanusGraphClient;
import org.openecomp.sdc.be.dao.janusgraph.JanusGraphOperationStatus;
import org.openecomp.sdc.common.log.wrappers.Logger;
import org.springframework.stereotype.Component;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.TransactionSystemException;
import org.springframework.transaction.support.SimpleTransactionStatus;
import javax.annotation.PostConstruct;
/**
* Simple transaction manager for the janusgraph database.
* This manager does not deal with transactions propagation and relies on the fact that transactions are automatically created with the first operation on the graph
*/
@Component
public class SimpleJanusGraphTransactionManager implements PlatformTransactionManager {
private static final Logger log = Logger.getLogger(SimpleJanusGraphTransactionManager.class.getName());
private final JanusGraphClient janusGraphClient;
private JanusGraph janusGraph;
public SimpleJanusGraphTransactionManager(JanusGraphClient janusGraphClient) {
this.janusGraphClient = janusGraphClient;
}
@PostConstruct
public void onInit() {
janusGraph = janusGraphClient.getGraph().left().on(this::onFailingToStartJanusGraph);
}
@Override
public TransactionStatus getTransaction(TransactionDefinition transactionDefinition) {
log.debug("#getTransaction - returning simple transaction status");
return new SimpleTransactionStatus();
}
@Override
public void commit(TransactionStatus transactionStatus) {
log.debug("#commit - committing transaction");
try {
janusGraph.tx().commit();
} catch (JanusGraphException e) {
log.debug("#commit - failed to commit transaction", e);
throw new TransactionSystemException("failed to commit transaction", e);
}
}
@Override
public void rollback(TransactionStatus transactionStatus) {
log.debug("#rollback - committing transaction");
try {
janusGraph.tx().rollback();
} catch (JanusGraphException e) {
log.debug("#rollback - failed to rollback transaction", e);
throw new TransactionSystemException("failed to rollback transaction", e);
}
}
private JanusGraph onFailingToStartJanusGraph(JanusGraphOperationStatus err) {
log.debug("#onFailingToStartJanusGraph - could not open janusgraph client");
throw new IllegalStateException("janusgraph could not be initialized: " + err);
}
}
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