| /** |
| * 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.storm.cassandra.trident.state; |
| |
| import com.datastax.driver.core.BatchStatement; |
| import com.datastax.driver.core.Session; |
| import com.datastax.driver.core.Statement; |
| import com.google.common.base.Preconditions; |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.cassandra.client.SimpleClient; |
| import org.apache.storm.cassandra.client.SimpleClientProvider; |
| import org.apache.storm.cassandra.query.CQLResultSetValuesMapper; |
| import org.apache.storm.cassandra.query.CQLStatementTupleMapper; |
| import org.apache.storm.topology.FailedException; |
| import org.apache.storm.trident.operation.TridentCollector; |
| import org.apache.storm.trident.state.State; |
| import org.apache.storm.trident.tuple.TridentTuple; |
| import org.apache.storm.tuple.Values; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class CassandraState implements State { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(CassandraState.class); |
| |
| private final Map<String, Object> conf; |
| private final Options options; |
| |
| private Session session; |
| private SimpleClient client; |
| |
| protected CassandraState(Map<String, Object> conf, Options options) { |
| this.conf = conf; |
| this.options = options; |
| } |
| |
| @Override |
| public void beginCommit(Long txid) { |
| LOG.debug("beginCommit is no operation"); |
| } |
| |
| @Override |
| public void commit(Long txid) { |
| LOG.debug("commit is no operation"); |
| } |
| |
| public void prepare() { |
| Preconditions.checkNotNull(options.cqlStatementTupleMapper, "CassandraState.Options should have cqlStatementTupleMapper"); |
| |
| client = options.clientProvider.getClient(conf); |
| session = client.connect(); |
| } |
| |
| public void cleanup() { |
| try { |
| session.close(); |
| } catch (Exception e) { |
| LOG.warn("Error occurred while closing Session", e); |
| } finally { |
| client.close(); |
| } |
| } |
| |
| public void updateState(List<TridentTuple> tuples, final TridentCollector collector) { |
| |
| List<Statement> statements = new ArrayList<>(); |
| for (TridentTuple tuple : tuples) { |
| statements.addAll(options.cqlStatementTupleMapper.map(conf, session, tuple)); |
| } |
| |
| try { |
| if (options.batchingType != null) { |
| BatchStatement batchStatement = new BatchStatement(options.batchingType); |
| batchStatement.addAll(statements); |
| session.execute(batchStatement); |
| } else { |
| for (Statement statement : statements) { |
| session.execute(statement); |
| } |
| } |
| } catch (Exception e) { |
| LOG.warn("Batch write operation is failed."); |
| collector.reportError(e); |
| throw new FailedException(e); |
| } |
| |
| } |
| |
| public List<List<Values>> batchRetrieve(List<TridentTuple> tridentTuples) { |
| Preconditions.checkNotNull(options.cqlResultSetValuesMapper, "CassandraState.Options should have cqlResultSetValuesMapper"); |
| |
| List<List<Values>> batchRetrieveResult = new ArrayList<>(); |
| try { |
| for (TridentTuple tridentTuple : tridentTuples) { |
| List<Statement> statements = options.cqlStatementTupleMapper.map(conf, session, tridentTuple); |
| for (Statement statement : statements) { |
| List<List<Values>> values = options.cqlResultSetValuesMapper.map(session, statement, tridentTuple); |
| batchRetrieveResult.addAll(values); |
| } |
| } |
| } catch (Exception e) { |
| LOG.warn("Batch retrieve operation is failed", e); |
| throw new FailedException(e); |
| } |
| return batchRetrieveResult; |
| } |
| |
| public static final class Options implements Serializable { |
| private final SimpleClientProvider clientProvider; |
| private CQLStatementTupleMapper cqlStatementTupleMapper; |
| private CQLResultSetValuesMapper cqlResultSetValuesMapper; |
| private BatchStatement.Type batchingType; |
| |
| public Options(SimpleClientProvider clientProvider) { |
| this.clientProvider = clientProvider; |
| } |
| |
| @SuppressWarnings("checkstyle:AbbreviationAsWordInName") |
| public Options withCQLStatementTupleMapper(CQLStatementTupleMapper cqlStatementTupleMapper) { |
| this.cqlStatementTupleMapper = cqlStatementTupleMapper; |
| return this; |
| } |
| |
| @SuppressWarnings("checkstyle:AbbreviationAsWordInName") |
| public Options withCQLResultSetValuesMapper(CQLResultSetValuesMapper cqlResultSetValuesMapper) { |
| this.cqlResultSetValuesMapper = cqlResultSetValuesMapper; |
| return this; |
| } |
| |
| public Options withBatching(BatchStatement.Type batchingType) { |
| this.batchingType = batchingType; |
| return this; |
| } |
| |
| } |
| |
| } |