{"action":"created","comment":{"url":"https://api.github.com/repos/apache/kafka/pulls/comments/130169603","pull_request_review_id":53008950,"id":130169603,"diff_hunk":"@@ -0,0 +1,640 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements. See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * the License. You may obtain a copy of the License at\n+ *\n+ *    http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+package org.apache.kafka.streams;\n+\n+import org.apache.kafka.common.serialization.Deserializer;\n+import org.apache.kafka.common.serialization.Serializer;\n+import org.apache.kafka.streams.errors.TopologyException;\n+import org.apache.kafka.streams.kstream.KStream;\n+import org.apache.kafka.streams.kstream.KTable;\n+import org.apache.kafka.streams.processor.Processor;\n+import org.apache.kafka.streams.processor.ProcessorSupplier;\n+import org.apache.kafka.streams.processor.StateStore;\n+import org.apache.kafka.streams.processor.StateStoreSupplier;\n+import org.apache.kafka.streams.processor.StreamPartitioner;\n+import org.apache.kafka.streams.processor.TimestampExtractor;\n+import org.apache.kafka.streams.processor.internals.InternalTopologyBuilder;\n+import org.apache.kafka.streams.processor.internals.ProcessorNode;\n+import org.apache.kafka.streams.processor.internals.ProcessorTopology;\n+import org.apache.kafka.streams.processor.internals.SinkNode;\n+import org.apache.kafka.streams.processor.internals.SourceNode;\n+import org.apache.kafka.streams.state.KeyValueStore;\n+\n+import java.util.regex.Pattern;\n+\n+/**\n+ * A logical representation of a {@link ProcessorTopology}.\n+ * A topology is an acyclic graph of sources, processors, and sinks.\n+ * A {@link SourceNode source} is a node in the graph that consumes one or more Kafka topics and forwards them to its\n+ * successor nodes.\n+ * A {@link Processor processor} is a node in the graph that receives input records from upstream nodes, processes that\n+ * records, and optionally forwarding new records to one or all of its downstream nodes.\n+ * Finally, a {@link SinkNode sink} is a node in the graph that receives records from upstream nodes and writes them to\n+ * a Kafka topic.\n+ * A {@code Topology} allows you to construct an acyclic graph of these nodes, and then passed into a new\n+ * {@link KafkaStreams} instance that will then {@link KafkaStreams#start() begin consuming, processing, and producing\n+ * records}.\n+ */\n+public class Topology 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