Updates to Async and Side Output based on Eng Feedback

.gitignore

@@ -12,4 +12,4 @@ env/
 venv/
 .java-version
 /pyflink/
-/.run/
+

java/AsyncIO/src/main/java/com/amazonaws/services/msf/ProcessedEvent.java

@@ -3,33 +3,20 @@
 public class ProcessedEvent {
 
     final String message;
-    public String processed;
 
     @Override
     public String toString() {
         return "ProcessedEvent{" +
                 ", message='" + message + '\'' +
-                ", processed='" + processed + '\'' +
                 '}';
     }
 
-    public ProcessedEvent(String message, String processed) {
+    public ProcessedEvent(String message) {
         this.message = message;
-        this.processed = processed;
     }
 
     // Getter methods
     public String getMessage() {
         return message;
     }
-
-    public String getProcessed() {
-        return processed;
-    }
-
-    // Setter method for processed field
-    public void setProcessed(String processed) {
-        this.processed = processed;
-    }
-
 }

java/AsyncIO/src/main/java/com/amazonaws/services/msf/ProcessingFunction.java

@@ -14,15 +14,15 @@
 
 import java.time.Duration;
 import java.util.Collections;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.Future;
+import java.util.concurrent.*;
 
 public class ProcessingFunction extends RichAsyncFunction<IncomingEvent, ProcessedEvent> {
     private static final Logger LOG = LoggerFactory.getLogger(ProcessingFunction.class);
 
     private final String apiUrl;
     private final String apiKey;
+    private static ExecutorService executorService;
+
 
     private transient AsyncHttpClient client;
 
@@ -43,41 +43,52 @@ public ProcessingFunction(String apiUrl, String apiKey) {
     public void open(Configuration parameters) throws Exception {
         DefaultAsyncHttpClientConfig.Builder clientBuilder = Dsl.config().setConnectTimeout(Duration.ofSeconds(10));
         client = Dsl.asyncHttpClient(clientBuilder);
+
+        int numCores = Runtime.getRuntime().availableProcessors(); // get num cores on node for thread count
+        executorService = Executors.newFixedThreadPool(numCores);
+
+    }
+
+    @Override
+    public void close() throws Exception
+    {
+        client.close();
+        executorService.shutdown();
     }
 
     @Override
     public void asyncInvoke(IncomingEvent incomingEvent, ResultFuture<ProcessedEvent> resultFuture) {
 
         // Create a new ProcessedEvent instance
-        ProcessedEvent processedEvent = new ProcessedEvent(incomingEvent.getMessage(), null);
+        ProcessedEvent processedEvent = new ProcessedEvent(incomingEvent.getMessage());
         LOG.debug("New request: {}", incomingEvent);
 
+        // Note: The Async Client used must return a Future object or equivalent
         Future<Response> future = client.prepareGet(apiUrl)
                 .setHeader("x-api-key", apiKey)
                 .execute();
 
-        // Asynchronously calling API and handling response via Completable Future
-        CompletableFuture.supplyAsync(() -> {
-            try {
-                LOG.debug("Trying to get response for {}", incomingEvent.getId());
-                Response response = future.get();
-                return response.getStatusCode();
-            } catch (InterruptedException | ExecutionException e) {
-                LOG.error("Error during async HTTP call: {}", e.getMessage());
-                return -1;
-            }
-        }).thenAccept(statusCode -> {
+        // Process the request via a Completable Future, in order to not block request synchronously
+        // Notice we are passing executor service for thread management
+        CompletableFuture.supplyAsync(() ->
+            {
+                try {
+                    LOG.debug("Trying to get response for {}", incomingEvent.getId());
+                    Response response = future.get();
+                    return response.getStatusCode();
+                } catch (InterruptedException | ExecutionException e) {
+                    LOG.error("Error during async HTTP call: {}", e.getMessage());
+                    return -1;
+                }
+            }, executorService).thenAccept(statusCode -> {
             if (statusCode == 200) {
-                processedEvent.setProcessed("SUCCESS");
                 LOG.debug("Success! {}", incomingEvent.getId());
                 resultFuture.complete(Collections.singleton(processedEvent));
             } else if (statusCode == 500) { // Retryable error
                 LOG.error("Status code 500, retrying shortly...");
-                processedEvent.setProcessed("FAIL");
                 resultFuture.completeExceptionally(new Throwable(statusCode.toString()));
             } else {
                 LOG.error("Unexpected status code: {}", statusCode);
-                processedEvent.setProcessed("FAIL");
                 resultFuture.completeExceptionally(new Throwable(statusCode.toString()));
             }
         });

java/AsyncIO/src/main/java/com/amazonaws/services/msf/RetriesFlinkJob.java

@@ -81,7 +81,7 @@ public static void main(String[] args) throws Exception {
                 Preconditions.checkArgument(!outputStreamArn.isEmpty(), "Output stream ARN must not be empty");
 
                 processedStream
-                        .map(value -> String.format("%s,%s", value.message, value.processed))
+                        .map(value -> String.format("%s", value.message))
                         .sinkTo(createSink(outputProperties));
 
                 LOGGER.debug("Starting flink job: {}", "Async I/O Retries");

java/SideOutputs/src/main/java/com/amazonaws/services/msf/IncomingEvent.java

@@ -17,4 +17,6 @@ public IncomingEvent(String message) {
 
 
 
+
+
 }

java/SideOutputs/src/main/java/com/amazonaws/services/msf/ProcessingOutcome.java

@@ -0,0 +1,17 @@
+package com.amazonaws.services.msf;
+
+public enum ProcessingOutcome {
+    SUCCESS("SUCCESS"),
+    ERROR("ERROR");
+
+    private final String text;
+
+    ProcessingOutcome(final String text) {
+        this.text = text;
+    }
+
+    @Override
+    public String toString() {
+        return text;
+    }
+}

java/SideOutputs/src/main/java/com/amazonaws/services/msf/SideOutputsFlinkJob.java

@@ -68,20 +68,20 @@ public static void main(String[] args) throws Exception {
                 .setParallelism(1);
 
         // Validate stream for invalid messages
-        SingleOutputStreamOperator<Tuple2<IncomingEvent, Boolean>> validatedStream = source
+        SingleOutputStreamOperator<Tuple2<IncomingEvent, ProcessingOutcome>> validatedStream = source
                 .map(incomingEvent -> {
-                    boolean isPoisoned = "Poison".equals(incomingEvent.message);
-                    return Tuple2.of(incomingEvent, isPoisoned);
-                }, TypeInformation.of(new TypeHint<Tuple2<IncomingEvent, Boolean>>() {
+                    ProcessingOutcome result = "Poison".equals(incomingEvent.message)?ProcessingOutcome.ERROR: ProcessingOutcome.SUCCESS;
+                    return Tuple2.of(incomingEvent, result);
+                }, TypeInformation.of(new TypeHint<Tuple2<IncomingEvent, ProcessingOutcome>>() {
                 }));
 
         // Split the stream based on validation
         SingleOutputStreamOperator<IncomingEvent> mainStream = validatedStream
-                .process(new ProcessFunction<Tuple2<IncomingEvent, Boolean>, IncomingEvent>() {
+                .process(new ProcessFunction<Tuple2<IncomingEvent, ProcessingOutcome>, IncomingEvent>() {
                     @Override
-                    public void processElement(Tuple2<IncomingEvent, Boolean> value, Context ctx,
+                    public void processElement(Tuple2<IncomingEvent, ProcessingOutcome> value, Context ctx,
                             Collector<IncomingEvent> out) throws Exception {
-                        if (value.f1) {
+                        if (value.f1.equals(ProcessingOutcome.ERROR)) {
                             // Invalid event (true), send to DLQ sink
                             ctx.output(invalidEventsTag, value.f0);
                         } else {