Github user alkagin commented on a diff in the pull request:
https://github.com/apache/flink/pull/1771#discussion_r61419752
--- Diff:
flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraSink.java
---
@@ -0,0 +1,316 @@
+/**
+ * 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
+ * <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 org.apache.flink.streaming.connectors.cassandra;
+
+import com.datastax.driver.core.Cluster;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.java.tuple.Tuple;
+import org.apache.flink.api.java.typeutils.TupleTypeInfo;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.datastream.DataStreamSink;
+import
org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
+import org.apache.flink.streaming.api.operators.ChainingStrategy;
+import org.apache.flink.streaming.api.transformations.SinkTransformation;
+import org.apache.flink.streaming.api.transformations.StreamTransformation;
+import org.apache.flink.streaming.runtime.operators.CheckpointCommitter;
+
+/**
+ * This class wraps different Cassandra sink implementations to provide a
common interface for all of them.
+ *
+ * @param <IN> input type
+ */
+public class CassandraSink<IN> {
+ private final boolean useDataStreamSink;
+ private DataStreamSink<IN> sink1;
+ private SingleOutputStreamOperator<IN> sink2;
+
+ private CassandraSink(DataStreamSink<IN> sink) {
+ sink1 = sink;
+ useDataStreamSink = true;
+ }
+
+ private CassandraSink(SingleOutputStreamOperator<IN> sink) {
+ sink2 = sink;
+ useDataStreamSink = false;
+ }
+
+ private SinkTransformation<IN> getSinkTransformation() {
+ return sink1.getTransformation();
+ }
+
+ private StreamTransformation<IN> getStreamTransformation() {
+ return sink2.getTransformation();
+ }
+
+ /**
+ * Sets the name of this sink. This name is
+ * used by the visualization and logging during runtime.
+ *
+ * @return The named sink.
+ */
+ public CassandraSink<IN> name(String name) {
+ if (useDataStreamSink) {
+ getSinkTransformation().setName(name);
+ } else {
+ getStreamTransformation().setName(name);
+ }
+ return this;
+ }
+
+ /**
+ * Sets an ID for this operator.
+ * <p/>
+ * <p>The specified ID is used to assign the same operator ID across job
+ * submissions (for example when starting a job from a savepoint).
+ * <p/>
+ * <p><strong>Important</strong>: this ID needs to be unique per
+ * transformation and job. Otherwise, job submission will fail.
+ *
+ * @param uid The unique user-specified ID of this transformation.
+ * @return The operator with the specified ID.
+ */
+ public CassandraSink<IN> uid(String uid) {
+ if (useDataStreamSink) {
+ getSinkTransformation().setUid(uid);
+ } else {
+ getStreamTransformation().setUid(uid);
+ }
+ return this;
+ }
+
+ /**
+ * Sets the parallelism for this sink. The degree must be higher than
zero.
+ *
+ * @param parallelism The parallelism for this sink.
+ * @return The sink with set parallelism.
+ */
+ public CassandraSink<IN> setParallelism(int parallelism) {
+ if (useDataStreamSink) {
+ getSinkTransformation().setParallelism(parallelism);
+ } else {
+ getStreamTransformation().setParallelism(parallelism);
+ }
+ return this;
+ }
+
+ /**
+ * Turns off chaining for this operator so thread co-location will not
be
+ * used as an optimization.
+ * <p/>
+ * <p/>
+ * Chaining can be turned off for the whole
+ * job by {@link
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment#disableOperatorChaining()}
+ * however it is not advised for performance considerations.
+ *
+ * @return The sink with chaining disabled
+ */
+ public CassandraSink<IN> disableChaining() {
+ if (useDataStreamSink) {
+
getSinkTransformation().setChainingStrategy(ChainingStrategy.NEVER);
+ } else {
+
getStreamTransformation().setChainingStrategy(ChainingStrategy.NEVER);
+ }
+ return this;
+ }
+
+ /**
+ * Sets the slot sharing group of this operation. Parallel instances of
+ * operations that are in the same slot sharing group will be
co-located in the same
+ * TaskManager slot, if possible.
+ * <p/>
+ * <p>Operations inherit the slot sharing group of input operations if
all input operations
+ * are in the same slot sharing group and no slot sharing group was
explicitly specified.
+ * <p/>
+ * <p>Initially an operation is in the default slot sharing group. An
operation can be put into
+ * the default group explicitly by setting the slot sharing group to
{@code "default"}.
+ *
+ * @param slotSharingGroup The slot sharing group name.
+ */
+ public CassandraSink<IN> slotSharingGroup(String slotSharingGroup) {
+ if (useDataStreamSink) {
+
getSinkTransformation().setSlotSharingGroup(slotSharingGroup);
+ } else {
+
getStreamTransformation().setSlotSharingGroup(slotSharingGroup);
+ }
+ return this;
+ }
+
+ /**
+ * Writes a DataStream into a Cassandra database.
+ *
+ * @param input input DataStream
+ * @param <IN> input type
+ * @return CassandraSinkBuilder, to further configure the sink
+ */
+ public static <IN, T extends Tuple> CassandraSinkBuilder<IN>
addSink(DataStream<IN> input) {
+ if (input.getType() instanceof TupleTypeInfo) {
+ DataStream<T> tupleInput = (DataStream<T>) input;
+ return (CassandraSinkBuilder<IN>) new
CassandraTupleSinkBuilder<>(tupleInput, tupleInput.getType(),
tupleInput.getType().createSerializer(tupleInput.getExecutionEnvironment().getConfig()));
+ } else {
+ return new CassandraPojoSinkBuilder<>(input,
input.getType(),
input.getType().createSerializer(input.getExecutionEnvironment().getConfig()));
+ }
+ }
+
+ public abstract static class CassandraSinkBuilder<IN> {
+ protected final DataStream<IN> input;
+ protected final TypeSerializer<IN> serializer;
+ protected final TypeInformation<IN> typeInfo;
+ protected ClusterBuilder builder;
+ protected String query;
+ protected CheckpointCommitter committer;
+ protected boolean isWriteAheadLogEnabled;
+
+ public CassandraSinkBuilder(DataStream<IN> input,
TypeInformation<IN> typeInfo, TypeSerializer<IN> serializer) {
+ this.input = input;
+ this.typeInfo = typeInfo;
+ this.serializer = serializer;
+ }
+
+ /**
+ * Sets the query that is to be executed for every record.
+ *
+ * @param query query to use
+ * @return this builder
+ */
+ public CassandraSinkBuilder<IN> setQuery(String query) {
+ this.query = query;
+ return this;
+ }
+
+ /**
+ * Sets the cassandra host to connect to.
+ *
+ * @param host host to connect to
+ * @return this builder
+ */
+ public CassandraSinkBuilder<IN> setHost(String host) {
+ return setHost(host, 9042);
+ }
+
+ /**
+ * Sets the cassandra host/port to connect to.
+ *
+ * @param host host to connect to
+ * @param port port to connect to
+ * @return this builder
+ */
+ public CassandraSinkBuilder<IN> setHost(final String host,
final int port) {
+ if (builder != null) {
+ throw new IllegalArgumentException("Builder was
already set. You must use either setHost() or setClusterBuilder().");
+ }
+ builder = new ClusterBuilder() {
+ @Override
+ protected Cluster buildCluster(Cluster.Builder
builder) {
+ return
builder.addContactPoint(host).withPort(port).build();
+ }
+ };
+ return this;
+ }
+
+ /**
+ * Sets the ClusterBuilder for this sink. A ClusterBuilder is
used to configure the connection to cassandra.
+ *
+ * @param builder ClusterBuilder to configure the connection to
cassandra
+ * @return this builder
+ */
+ public CassandraSinkBuilder<IN>
setClusterBuilder(ClusterBuilder builder) {
+ if (builder != null) {
--- End diff --
`this.builder`instead of `builder`, correct?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
