[GitHub] kramasamy closed pull request #2935: make EvitionContext extend Serializable

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kramasamy closed pull request #2935: make EvitionContext extend Serializable
URL: https://github.com/apache/incubator-heron/pull/2935
 
 
   

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diff --git a/examples/src/java/org/apache/heron/examples/api/StatefulTumblingWindowTopology.java b/examples/src/java/org/apache/heron/examples/api/StatefulTumblingWindowTopology.java
new file mode 100644
index 0000000000..b39e3ffa02
--- /dev/null
+++ b/examples/src/java/org/apache/heron/examples/api/StatefulTumblingWindowTopology.java
@@ -0,0 +1,181 @@
+/**
+ * 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.heron.examples.api;
+
+import java.time.Duration;
+import java.util.Map;
+import java.util.Random;
+import java.util.logging.Logger;
+
+import org.apache.heron.api.Config;
+import org.apache.heron.api.HeronSubmitter;
+import org.apache.heron.api.bolt.BaseStatefulWindowedBolt;
+import org.apache.heron.api.bolt.OutputCollector;
+import org.apache.heron.api.spout.BaseRichSpout;
+import org.apache.heron.api.spout.SpoutOutputCollector;
+import org.apache.heron.api.state.State;
+import org.apache.heron.api.topology.IStatefulComponent;
+import org.apache.heron.api.topology.OutputFieldsDeclarer;
+import org.apache.heron.api.topology.TopologyBuilder;
+import org.apache.heron.api.topology.TopologyContext;
+import org.apache.heron.api.tuple.Fields;
+import org.apache.heron.api.tuple.Tuple;
+import org.apache.heron.api.tuple.Values;
+import org.apache.heron.api.utils.Utils;
+import org.apache.heron.api.windowing.TupleWindow;
+import org.apache.heron.common.basics.ByteAmount;
+import org.apache.heron.examples.api.bolt.PrinterBolt;
+
+/**
+ * A sample topology that demonstrates the usage of {@link org.apache.heron.api.bolt.IStatefulWindowedBolt}
+ * to calculate tumbling window sum.  Topology also demonstrates how stateful window processing is done
+ * in conjunction with effectively once guarantees
+ */
+public final class StatefulTumblingWindowTopology {
+
+  private static final Logger LOG = Logger.getLogger(StatefulSlidingWindowTopology.class.getName());
+
+  private StatefulTumblingWindowTopology() {
+  }
+
+  private static class WindowSumBolt extends BaseStatefulWindowedBolt<String, Long> {
+    private static final long serialVersionUID = -539382497249834244L;
+    private State<String, Long> state;
+    private long sum;
+
+    private OutputCollector collector;
+
+    @Override
+    @SuppressWarnings("HiddenField")
+    public void prepare(Map<String, Object> topoConf, TopologyContext context,
+                        OutputCollector collector) {
+      this.collector = collector;
+    }
+
+    @Override
+    @SuppressWarnings("HiddenField")
+    public void initState(State<String, Long> state) {
+      this.state = state;
+      sum = state.getOrDefault("sum", 0L);
+    }
+
+    @Override
+    public void execute(TupleWindow inputWindow) {
+      for (Tuple tuple : inputWindow.get()) {
+        sum += tuple.getLongByField("value");
+      }
+      collector.emit(new Values(sum));
+    }
+
+    @Override
+    public void declareOutputFields(OutputFieldsDeclarer declarer) {
+      declarer.declare(new Fields("sum"));
+    }
+
+    @Override
+    public void preSave(String checkpointId) {
+      state.put("sum", sum);
+    }
+  }
+
+  public static class IntegerSpout extends BaseRichSpout
+      implements IStatefulComponent<String, Long> {
+    private static final Logger LOG = Logger.getLogger(IntegerSpout.class.getName());
+    private static final long serialVersionUID = 5454291010750852782L;
+    private SpoutOutputCollector collector;
+    private Random rand;
+    private long msgId;
+    private State<String, Long> state;
+
+    @Override
+    public void declareOutputFields(OutputFieldsDeclarer declarer) {
+      declarer.declare(new Fields("value", "ts", "msgid"));
+    }
+
+    @Override
+    @SuppressWarnings("HiddenField")
+    public void open(Map<String, Object> conf, TopologyContext context, SpoutOutputCollector
+        collector) {
+      this.collector = collector;
+      this.rand = new Random();
+    }
+
+    @Override
+    public void nextTuple() {
+      Utils.sleep(1000);
+      long val = msgId;
+      collector.emit(new Values(val,
+          System.currentTimeMillis() - (24 * 60 * 60 * 1000), msgId), msgId);
+      msgId++;
+    }
+
+    @Override
+    @SuppressWarnings("HiddenField")
+    public void ack(Object msgId) {
+      LOG.fine("Got ACK for msgId : " + msgId);
+    }
+
+    @Override
+    @SuppressWarnings("HiddenField")
+    public void fail(Object msgId) {
+      LOG.fine("Got FAIL for msgId : " + msgId);
+    }
+
+    @Override
+    @SuppressWarnings("HiddenField")
+    public void initState(State<String, Long> state) {
+      this.state = state;
+      this.msgId = this.state.getOrDefault("msgId", 0L);
+    }
+
+    @Override
+    public void preSave(String checkpointId) {
+      this.state.put("msgId", msgId);
+    }
+  }
+
+  public static void main(String[] args) throws Exception {
+    TopologyBuilder builder = new TopologyBuilder();
+    builder.setSpout("integer", new IntegerSpout(), 1);
+    WindowSumBolt windowSumBolt = new WindowSumBolt();
+    windowSumBolt.withTumblingWindow(Duration.ofSeconds(10));
+    builder.setBolt("sumbolt", windowSumBolt, 1).shuffleGrouping("integer");
+    builder.setBolt("printer", new PrinterBolt()).shuffleGrouping("sumbolt");
+    Config conf = new Config();
+    conf.setDebug(true);
+    String topoName = "test";
+
+    Config.setComponentRam(conf, "integer", ByteAmount.fromGigabytes(1));
+    Config.setComponentRam(conf, "sumbolt", ByteAmount.fromGigabytes(1));
+    Config.setComponentRam(conf, "printer", ByteAmount.fromGigabytes(1));
+
+    Config.setContainerDiskRequested(conf, ByteAmount.fromGigabytes(5));
+    Config.setContainerCpuRequested(conf, 4);
+
+    conf.setTopologyReliabilityMode(Config.TopologyReliabilityMode.EFFECTIVELY_ONCE);
+    conf.setTopologyStatefulCheckpointIntervalSecs(20);
+    conf.setMaxSpoutPending(1000);
+
+    if (args != null && args.length > 0) {
+      topoName = args[0];
+    }
+    HeronSubmitter.submitTopology(topoName, conf, builder.createTopology());
+  }
+}
diff --git a/heron/api/src/java/org/apache/heron/api/windowing/EvictionContext.java b/heron/api/src/java/org/apache/heron/api/windowing/EvictionContext.java
index 9aeb37dca6..1282e83b2a 100644
--- a/heron/api/src/java/org/apache/heron/api/windowing/EvictionContext.java
+++ b/heron/api/src/java/org/apache/heron/api/windowing/EvictionContext.java
@@ -19,10 +19,12 @@
 
 package org.apache.heron.api.windowing;
 
+import java.io.Serializable;
+
 /**
  * Context information that can be used by the eviction policy
  */
-public interface EvictionContext {
+public interface EvictionContext extends Serializable {
   /**
    * Returns the reference time that the eviction policy could use to
    * evict the events. In the case of event time processing, this would be


 

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