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package org.openecomp.sdc.be.dao.titan.transactions;
import com.thinkaurelius.titan.core.TitanException;
import com.thinkaurelius.titan.core.TitanGraph;
import org.openecomp.sdc.be.dao.titan.TitanGraphClient;
import org.openecomp.sdc.be.dao.titan.TitanOperationStatus;
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 titan 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 SimpleTitanTransactionManager implements PlatformTransactionManager {
private static final Logger log = Logger.getLogger(SimpleTitanTransactionManager.class.getName());
private final TitanGraphClient titanClient;
private TitanGraph titanGraph;
public SimpleTitanTransactionManager(TitanGraphClient titanClient) {
this.titanClient = titanClient;
}
@PostConstruct
public void onInit() {
titanGraph = titanClient.getGraph().left().on(this::onFailingToStartTitan);
}
@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 {
titanGraph.tx().commit();
} catch (TitanException 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 {
titanGraph.tx().rollback();
} catch (TitanException e) {
log.debug("#rollback - failed to rollback transaction", e);
throw new TransactionSystemException("failed to rollback transaction", e);
}
}
private TitanGraph onFailingToStartTitan(TitanOperationStatus err) {
log.debug("#onFailingToStartTitan - could not open titan client");
throw new IllegalStateException("titan could not be initialized: " + err);
}
}
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