Github user ptgoetz commented on a diff in the pull request:
https://github.com/apache/storm/pull/934#discussion_r47144860
--- Diff:
examples/storm-starter/src/jvm/storm/starter/BlobStoreAPIWordCountTopology.java
---
@@ -0,0 +1,248 @@
+/**
+ * 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 storm.starter;
+
+import backtype.storm.Config;
+import backtype.storm.StormSubmitter;
+import backtype.storm.LocalCluster;
+import backtype.storm.blobstore.AtomicOutputStream;
+import backtype.storm.blobstore.ClientBlobStore;
+import backtype.storm.blobstore.InputStreamWithMeta;
+import backtype.storm.blobstore.NimbusBlobStore;
+
+import backtype.storm.generated.AccessControl;
+import backtype.storm.generated.AccessControlType;
+import backtype.storm.generated.AlreadyAliveException;
+import backtype.storm.generated.AuthorizationException;
+import backtype.storm.generated.InvalidTopologyException;
+import backtype.storm.generated.KeyAlreadyExistsException;
+import backtype.storm.generated.KeyNotFoundException;
+import backtype.storm.generated.SettableBlobMeta;
+import backtype.storm.spout.SpoutOutputCollector;
+import backtype.storm.task.ShellBolt;
+import backtype.storm.task.TopologyContext;
+import backtype.storm.topology.BasicOutputCollector;
+import backtype.storm.topology.IRichBolt;
+import backtype.storm.topology.OutputFieldsDeclarer;
+import backtype.storm.topology.TopologyBuilder;
+import backtype.storm.topology.base.BaseBasicBolt;
+import backtype.storm.topology.base.BaseRichSpout;
+import backtype.storm.tuple.Fields;
+import backtype.storm.tuple.Tuple;
+import backtype.storm.tuple.Values;
+import backtype.storm.utils.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+
+public class BlobStoreAPIWordCountTopology {
+ private static NimbusBlobStore store = new NimbusBlobStore(); //
Client API to invoke blob store API functionality
+ private static String key = "key1";
+ private static final Logger LOG =
LoggerFactory.getLogger(BlobStoreAPIWordCountTopology.class);
+ private static final int READ = 0x01;
+ private static final int WRITE = 0x02;
+ private static final int ADMIN = 0x04;
+ private static final List<AccessControl> WORLD_EVERYTHING =
+ Arrays.asList(new AccessControl(AccessControlType.OTHER, READ
| WRITE | ADMIN));
+
+ // Spout implementation
+ public static class RandomSentenceSpout extends BaseRichSpout {
+ SpoutOutputCollector _collector;
+ BlobStoreAPIWordCountTopology wc;
+ String key;
+ NimbusBlobStore store;
+
+
+ @Override
+ public void open(Map conf, TopologyContext context,
SpoutOutputCollector collector) {
+ _collector = collector;
+ wc = new BlobStoreAPIWordCountTopology();
+ key = "key1";
+ store = new NimbusBlobStore();
+ store.prepare(Utils.readStormConfig());
+ }
+
+ @Override
+ public void nextTuple() {
+ Utils.sleep(100);
+ try {
+ _collector.emit(new Values(wc.getBlobContent(key,
store)));
+ } catch (AuthorizationException | KeyNotFoundException |
IOException exp) {
+ throw new RuntimeException(exp);
+ }
+ }
+
+ @Override
+ public void ack(Object id) {
+ }
+
+ @Override
+ public void fail(Object id) {
+ }
+
+ @Override
+ public void declareOutputFields(OutputFieldsDeclarer declarer) {
+ declarer.declare(new Fields("word"));
+ }
+
+ }
+
+ // Bolt implementation
+ public static class SplitSentence extends ShellBolt implements
IRichBolt {
+
+ public SplitSentence() {
+ super("python", "splitsentence.py");
+ }
+
+ @Override
+ public void declareOutputFields(OutputFieldsDeclarer declarer) {
+ declarer.declare(new Fields("word"));
+ }
+
+ @Override
+ public Map<String, Object> getComponentConfiguration() {
+ return null;
+ }
+ }
+
+ public static class WordCount extends BaseBasicBolt {
+ Map<String, Integer> counts = new HashMap<String, Integer>();
+
+ @Override
+ public void execute(Tuple tuple, BasicOutputCollector collector) {
+ String word = tuple.getString(0);
+ Integer count = counts.get(word);
+ if (count == null)
+ count = 0;
+ count++;
+ counts.put(word, count);
+ collector.emit(new Values(word, count));
+ }
+
+ @Override
+ public void declareOutputFields(OutputFieldsDeclarer declarer) {
+ declarer.declare(new Fields("word", "count"));
+ }
+ }
+
+ public void buildAndLaunchWordCountTopology(String[] args) {
+
+ TopologyBuilder builder = new TopologyBuilder();
+
+ builder.setSpout("spout", new RandomSentenceSpout(), 5);
+
+ builder.setBolt("split", new SplitSentence(),
8).shuffleGrouping("spout");
+ builder.setBolt("count", new WordCount(),
12).fieldsGrouping("split", new Fields("word"));
+
+ Config conf = new Config();
+ conf.setDebug(true);
+
+ try {
+ if (args != null && args.length > 0) {
+ conf.setNumWorkers(3);
+ StormSubmitter.submitTopologyWithProgressBar(args[0],
conf, builder.createTopology());
+ } else {
+ conf.setMaxTaskParallelism(3);
+
+ LocalCluster cluster = new LocalCluster();
+ cluster.submitTopology("word-count", conf,
builder.createTopology());
+
+ Thread.sleep(10000);
+
+ cluster.shutdown();
+ }
+ } catch (InvalidTopologyException | AuthorizationException |
AlreadyAliveException | InterruptedException exp) {
+ throw new RuntimeException(exp);
+ }
+ }
+
+ private static void createBlobWithContent(String blobKey,
ClientBlobStore clientBlobStore, SettableBlobMeta settableBlobMeta)
+ throws AuthorizationException, KeyAlreadyExistsException,
IOException,KeyNotFoundException {
+ AtomicOutputStream blobStream =
clientBlobStore.createBlob(blobKey,settableBlobMeta);
+ blobStream.write(getRandomSentence().getBytes());
+ blobStream.close();
+ }
+
+ private static String getBlobContent(String blobKey, ClientBlobStore
clientBlobStore)
+ throws AuthorizationException, KeyNotFoundException,
IOException {
+ InputStreamWithMeta blobInputStream =
clientBlobStore.getBlob(blobKey);
+ BufferedReader r = new BufferedReader(new
InputStreamReader(blobInputStream));
+ return r.readLine();
+ }
+
+ private static void updateBlobWithContent(String blobKey,
ClientBlobStore clientBlobStore)
+ throws KeyNotFoundException, AuthorizationException,
IOException {
+ AtomicOutputStream blobOutputStream =
clientBlobStore.updateBlob(blobKey);
+ blobOutputStream.write(getRandomSentence().getBytes());
+ blobOutputStream.close();
+ }
+
+ private static String getRandomSentence() {
+ String[] sentences = new String[]{ "the cow jumped over the moon",
"an apple a day keeps the doctor away",
+ "four score and seven years ago", "snow white and the
seven dwarfs", "i am at two with nature" };
+ String sentence = sentences[new
Random().nextInt(sentences.length)];
+ return sentence;
+ }
+
+ private void prepareAndPerformBasicOperations()
+ throws KeyAlreadyExistsException, AuthorizationException,
KeyNotFoundException, IOException{
+ Map conf = Utils.readStormConfig();
+ store.prepare(conf);
+ // create blob with content
+ createBlobWithContent(key, store, new
SettableBlobMeta(WORLD_EVERYTHING));
+ // read blob content
+ LOG.info(getBlobContent(key, store));
+ // update blob
+ updateBlobWithContent(key, store);
+ LOG.info(getBlobContent(key, store));
+ // delete blob through API
+ store.deleteBlob(key);
+ }
+
+ public static void main(String[] args) {
+ // Basic blob store API calls create, read, update and delete
+ BlobStoreAPIWordCountTopology wc = new
BlobStoreAPIWordCountTopology();
+ try {
+ wc.prepareAndPerformBasicOperations();
+ // Creating blob again before launching topology
+ createBlobWithContent(key, store, new
SettableBlobMeta(WORLD_EVERYTHING));
+ LOG.info(getBlobContent(key, store));
+ // Launching word count topology with blob updates
+ wc.buildAndLaunchWordCountTopology(args);
+ // Updating blobs few times
+ for (int i = 0; i < 10; i++) {
+ updateBlobWithContent(key, store);
+ Utils.sleep(100);
+ }
+ } catch (KeyAlreadyExistsException kae) {
+ // Do nothing
--- End diff --
We should probably at least log the exception here.
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