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CassandraLineageEdgeFactory.java
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CassandraLineageEdgeFactory.java
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/**
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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 edu.berkeley.ground.api.usage.cassandra;
import edu.berkeley.ground.api.models.Tag;
import edu.berkeley.ground.api.usage.LineageEdge;
import edu.berkeley.ground.api.usage.LineageEdgeFactory;
import edu.berkeley.ground.api.versions.GroundType;
import edu.berkeley.ground.api.versions.cassandra.CassandraItemFactory;
import edu.berkeley.ground.db.CassandraClient;
import edu.berkeley.ground.db.DBClient;
import edu.berkeley.ground.db.DbDataContainer;
import edu.berkeley.ground.db.QueryResults;
import edu.berkeley.ground.exceptions.EmptyResultException;
import edu.berkeley.ground.exceptions.GroundDBException;
import edu.berkeley.ground.util.IdGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class CassandraLineageEdgeFactory extends LineageEdgeFactory {
private static final Logger LOGGER = LoggerFactory.getLogger(CassandraLineageEdgeFactory.class);
private final CassandraClient dbClient;
private final CassandraItemFactory itemFactory;
private final IdGenerator idGenerator;
public CassandraLineageEdgeFactory(CassandraItemFactory itemFactory, CassandraClient dbClient, IdGenerator idGenerator) {
this.dbClient = dbClient;
this.itemFactory = itemFactory;
this.idGenerator = idGenerator;
}
public LineageEdge create(String name, Map<String, Tag> tags) throws GroundDBException {
try {
long uniqueId = this.idGenerator.generateItemId();
this.itemFactory.insertIntoDatabase(uniqueId, tags);
List<DbDataContainer> insertions = new ArrayList<>();
insertions.add(new DbDataContainer("name", GroundType.STRING, name));
insertions.add(new DbDataContainer("item_id", GroundType.LONG, uniqueId));
this.dbClient.insert("lineage_edge", insertions);
this.dbClient.commit();
LOGGER.info("Created lineage edge " + name + ".");
return LineageEdgeFactory.construct(uniqueId, name, tags);
} catch (GroundDBException e) {
this.dbClient.abort();
throw e;
}
}
public LineageEdge retrieveFromDatabase(String name) throws GroundDBException {
try {
List<DbDataContainer> predicates = new ArrayList<>();
predicates.add(new DbDataContainer("name", GroundType.STRING, name));
QueryResults resultSet;
try {
resultSet = this.dbClient.equalitySelect("lineage_edge", DBClient.SELECT_STAR, predicates);
} catch (EmptyResultException e) {
this.dbClient.abort();
throw new GroundDBException("No LineageEdge found with name " + name + ".");
}
if (!resultSet.next()) {
this.dbClient.abort();
throw new GroundDBException("No LineageEdge found with name " + name + ".");
}
long id = resultSet.getLong("item_id");
Map<String, Tag> tags = this.itemFactory.retrieveFromDatabase(id).getTags();
this.dbClient.commit();
LOGGER.info("Retrieved lineage edge " + name + ".");
return LineageEdgeFactory.construct(id, name, tags);
} catch (GroundDBException e) {
this.dbClient.abort();
throw e;
}
}
public void update(long itemId, long childId, List<Long> parentIds) throws GroundDBException {
this.itemFactory.update(itemId, childId, parentIds);
}
}