[
https://issues.apache.org/jira/browse/RYA-443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358527#comment-16358527
]
ASF GitHub Bot commented on RYA-443:
------------------------------------
Github user ejwhite922 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/272#discussion_r167235195
--- Diff:
extras/rya.streams/kafka/src/main/java/org/apache/rya/streams/kafka/SingleThreadKafkaStreamsFactory.java
---
@@ -0,0 +1,90 @@
+/**
+ * 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.rya.streams.kafka;
+
+import static java.util.Objects.requireNonNull;
+
+import java.util.Properties;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.streams.KafkaStreams;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.processor.TopologyBuilder;
+import org.apache.rya.api.function.projection.RandomUUIDFactory;
+import org.apache.rya.streams.api.entity.StreamsQuery;
+import org.apache.rya.streams.kafka.topology.TopologyBuilderFactory;
+import
org.apache.rya.streams.kafka.topology.TopologyBuilderFactory.TopologyBuilderException;
+import org.apache.rya.streams.kafka.topology.TopologyFactory;
+import org.openrdf.query.MalformedQueryException;
+
+import edu.umd.cs.findbugs.annotations.DefaultAnnotation;
+import edu.umd.cs.findbugs.annotations.NonNull;
+
+/**
+ * Creates {@link KafkaStreams} objects that are able to process {@link
StreamsQuery}s
+ * using a single thread of execution starting from the earliest point in
within the
+ * input topic. The Application ID used by the client is based on the
Query ID of the
+ * query that is being executed so that this job may resume where it left
off if it
+ * is stopped.
+ */
+@DefaultAnnotation(NonNull.class)
+public class SingleThreadKafkaStreamsFactory implements
KafkaStreamsFactory {
+
+ private final TopologyBuilderFactory topologyFactory = new
TopologyFactory();
+
+ private final String bootstrapServersConfig;
+
+ /**
+ * Constructs an instance of {@link SingleThreadKafkaStreamsFactory}.
+ *
+ * @param bootstrapServersConfig - Configures which Kafka cluster the
jobs will interact with. (not null)
+ */
+ public SingleThreadKafkaStreamsFactory(final String
bootstrapServersConfig) {
+ this.bootstrapServersConfig =
requireNonNull(bootstrapServersConfig);
+ }
+
+ @Override
+ public KafkaStreams make(final String ryaInstance, final StreamsQuery
query) throws KafkaStreamsFactoryException {
+ requireNonNull(ryaInstance);
+ requireNonNull(query);
+
+ // Setup the Kafka Stream program.
+ final Properties streamsProps = new Properties();
+
+ // Configure the Kafka servers that will be talked to.
+ streamsProps.setProperty(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,
bootstrapServersConfig);
+
+ // Use the Query ID as the Application ID to ensure we resume
where we left off the last time this command was run.
+ streamsProps.put(StreamsConfig.APPLICATION_ID_CONFIG,
"RyaStreams-Query-" + query.getQueryId());
+
+ // Always start at the beginning of the input topic.
+ streamsProps.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,
"earliest");
+
+ // Setup the topology that processes the Query.
+ final String statementsTopic =
KafkaTopics.statementsTopic(ryaInstance);
+ final String resultsTopic =
KafkaTopics.queryResultsTopic(query.getQueryId());
+
+ try {
+ final TopologyBuilder topologyBuilder =
topologyFactory.build(query.getSparql(), statementsTopic, resultsTopic, new
RandomUUIDFactory());
+ return new KafkaStreams(topologyBuilder, new
StreamsConfig(streamsProps));
+ } catch (MalformedQueryException | TopologyBuilderException e) {
--- End diff --
add final to Exceptions
> Implement a single node query manager
> -------------------------------------
>
> Key: RYA-443
> URL: https://issues.apache.org/jira/browse/RYA-443
> Project: Rya
> Issue Type: Task
> Reporter: Andrew Smith
> Assignee: Kevin Chilton
> Priority: Major
>
> We need an application that watches the QueryChangeLog to see when the
> isActive state of queries changes and then reacts to the state change. If
> isActive goes to true, the system must start processing the query. If it is
> false, then it must stop processing the query. This application needs to
> start when the host machine starts. We plan to support CentOS 7.
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