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https://issues.apache.org/jira/browse/STORM-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15040766#comment-15040766
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ASF GitHub Bot commented on STORM-1211:
---------------------------------------
Github user satishd commented on a diff in the pull request:
https://github.com/apache/storm/pull/915#discussion_r46651795
--- Diff:
external/storm-cassandra/src/main/java/org/apache/storm/cassandra/trident/state/CassandraState.java
---
@@ -0,0 +1,154 @@
+/**
+ * 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 backtype.storm.task.IMetricsContext;
+import backtype.storm.topology.FailedException;
+import backtype.storm.tuple.Values;
+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 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.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import storm.trident.operation.TridentCollector;
+import storm.trident.state.State;
+import storm.trident.tuple.TridentTuple;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+/**
+ *
+ */
+public class CassandraState implements State {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(CassandraState.class);
+
+ private final Map conf;
+ private final Options options;
+
+ private Session session;
+ private SimpleClient client;
+
+ public CassandraState(Map conf, IMetricsContext metrics, int
partitionIndex, int numPartitions, Options options) {
+ this.conf = conf;
+ this.options = options;
+ }
+
+ public static final class Options implements Serializable {
+ private final SimpleClientProvider clientProvider;
+ private CQLStatementTupleMapper cqlStatementTupleMapper;
+ private CQLResultSetValuesMapper cqlResultSetValuesMapper;
+ private BatchStatement.Type batchingType =
BatchStatement.Type.LOGGED;
+
+
+ public Options(SimpleClientProvider clientProvider) {
+ this.clientProvider = clientProvider;
+ }
+
+ public Options withCQLStatementTupleMapper(CQLStatementTupleMapper
cqlStatementTupleMapper) {
+ this.cqlStatementTupleMapper = cqlStatementTupleMapper;
+ return this;
+ }
+
+ public Options
withCQLResultSetValuesMapper(CQLResultSetValuesMapper cqlResultSetValuesMapper)
{
+ this.cqlResultSetValuesMapper = cqlResultSetValuesMapper;
+ return this;
+ }
+
+ public Options withBatching(BatchStatement.Type batchingType) {
+ this.batchingType = batchingType;
+ return this;
+ }
+
+ }
+
+ @Override
+ public void beginCommit(Long txid) {
+ LOG.debug("beginCommit is noop");
+ }
+
+ @Override
+ public void commit(Long txid) {
+ LOG.debug("commit is noop");
--- End diff --
It seems storm.trident.state.map.TransactionalMap provides the semantics.
IBackingMap implementation can be wrapped into that. HBase and Redis use these
APIs for having transactional semantics.
> Add trident state and query support for cassandra connector
> -----------------------------------------------------------
>
> Key: STORM-1211
> URL: https://issues.apache.org/jira/browse/STORM-1211
> Project: Apache Storm
> Issue Type: Improvement
> Reporter: Satish Duggana
> Assignee: Satish Duggana
>
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