[GitHub] [pulsar-adapters] dlg99 commented on a change in pull request #34: Removing Flink adapter in favor of the one included with Flink

[GitBox <gi...@apache.org>]

dlg99 commented on a change in pull request #34:
URL: https://github.com/apache/pulsar-adapters/pull/34#discussion_r798893867



##########
File path: examples/kafka-streams/src/main/java/org/apache/kafka/kafkastreams/pulsar/example/PageViewTypedDemo.java
##########
@@ -0,0 +1,279 @@
+/**
+ * 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.kafka.kafkastreams.pulsar.example;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.errors.SerializationException;
+import org.apache.kafka.common.serialization.Deserializer;
+import org.apache.kafka.common.serialization.Serde;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.common.serialization.Serializer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.apache.kafka.connect.json.JsonDeserializer;
+import org.apache.kafka.connect.json.JsonSerializer;
+import org.apache.kafka.streams.KafkaStreams;
+import org.apache.kafka.streams.KeyValue;
+import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.kstream.Consumed;
+import org.apache.kafka.streams.kstream.Grouped;
+import org.apache.kafka.streams.kstream.KStream;
+import org.apache.kafka.streams.kstream.KTable;
+import org.apache.kafka.streams.kstream.TimeWindows;
+import org.apache.pulsar.client.impl.schema.generic.GenericJsonSchema;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.Map;
+import java.util.Properties;
+import java.util.concurrent.CountDownLatch;
+
+/**
+ * Slightly adjusted
+ * https://github.com/apache/kafka/blob/2.7/streams/examples/src/main/java/org/apache/kafka/streams/examples/pageview/PageViewTypedDemo.java
+ *
+ * Demonstrates how to perform a join between a KStream and a KTable, i.e. an example of a stateful computation,
+ * using specific data types (here: JSON POJO; but can also be Avro specific bindings, etc.) for serdes
+ * in Kafka Streams.
+ *
+ * In this example, we join a stream of pageviews (aka clickstreams) that reads from a topic named "streams-pageview-input"
+ * with a user profile table that reads from a topic named "streams-userprofile-input", where the data format
+ * is JSON string representing a record in the stream or table, to compute the number of pageviews per user region.
+ *
+ * Before running this example you must create the input topics and the output topic (e.g. via
+ * bin/kafka-topics --create ...), and write some data to the input topics (e.g. via
+ * bin/kafka-console-producer). Otherwise you won't see any data arriving in the output topic.
+ *
+ * The inputs for this example are:
+ * - Topic: streams-pageview-input
+ *   Key Format: (String) USER_ID
+ *   Value Format: (JSON) {"_t": "pv", "user": (String USER_ID), "page": (String PAGE_ID), "timestamp": (long ms TIMESTAMP)}
+ *
+ * - Topic: streams-userprofile-input
+ *   Key Format: (String) USER_ID
+ *   Value Format: (JSON) {"_t": "up", "region": (String REGION), "timestamp": (long ms TIMESTAMP)}
+ *
+ * To observe the results, read the output topic (e.g., via bin/kafka-console-consumer)
+ * - Topic: streams-pageviewstats-typed-output
+ *   Key Format: (JSON) {"_t": "wpvbr", "windowStart": (long ms WINDOW_TIMESTAMP), "region": (String REGION)}
+ *   Value Format: (JSON) {"_t": "rc", "count": (long REGION_COUNT), "region": (String REGION)}
+ *
+ * Note, the "_t" field is necessary to help Jackson identify the correct class for deserialization in the
+ * generic {@link JSONSerde}. If you instead specify a specific serde per class, you won't need the extra "_t" field.
+ */
+@SuppressWarnings({"WeakerAccess", "unused"})
+public class PageViewTypedDemo {

Review comment:
       oh no, I'll fix that




-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: dev-unsubscribe@pulsar.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org