Add links on batch send operation in eventhubs

sdk/core/azure-core-amqp/src/main/java/com/azure/core/amqp/implementation/TracerProvider.java

@@ -108,6 +108,20 @@ public Context extractContext(String diagnosticId, Context context) {
         return local;
     }
 
+    /**
+     * For each tracer plugged into the SDK a new context containing the span builder is returned.
+     *
+     * @param context Additional metadata containing the span name for creating the span builer.
+     */
+    public Context getSharedSpanBuilder(Context context) {
+        Context local = Objects.requireNonNull(context, "'context' cannot be null.");
+        String spanName = getSpanName(ProcessKind.SEND);
+        for (Tracer tracer : tracers) {
+            local = tracer.getSharedSpanBuilder(spanName, local);
+        }
+        return local;
+    }
+
     private void end(String statusMessage, Throwable throwable, Context context) {
         for (Tracer tracer : tracers) {
             tracer.end(statusMessage, throwable, context);

sdk/core/azure-core-amqp/src/test/java/com/azure/core/amqp/implementation/TracerProviderTest.java

@@ -24,6 +24,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.ArgumentMatchers.isNull;
 import static org.mockito.Mockito.never;
@@ -194,4 +195,40 @@ public void addSpanLinks() {
         // Act
         assertThrows(NullPointerException.class, () -> tracerProvider.addSpanLinks(null));
     }
+
+    @Test
+    public void getSpanBuilderReturnsUpdatedContext() {
+        // Arrange
+        final String spanBuilderKey = "spanBuilder-key";
+        final String spanBuilderValue = "spanBuilder-value";
+
+        final String spanBuilderKey1 = "spanBuilder-key1";
+        final String spanBuilderValue1 = "spanBuilder-value1";
+        final Context startingContext = Context.NONE;
+
+        when(tracer.getSharedSpanBuilder(anyString(), any())).thenAnswer(
+            invocation -> {
+                Context passed = invocation.getArgument(1, Context.class);
+                return passed.addData(spanBuilderKey, spanBuilderValue);
+            }
+        );
+        when(tracer2.getSharedSpanBuilder(anyString(), any())).thenAnswer(
+            invocation -> {
+                Context passed = invocation.getArgument(1, Context.class);
+                return passed.addData(spanBuilderKey1, spanBuilderValue1);
+            }
+        );
+
+        // Act
+        final Context updatedContext = tracerProvider.getSharedSpanBuilder(startingContext);
+
+        // Assert
+        final Optional<Object> spanBuilderData = updatedContext.getData(spanBuilderKey);
+        Assertions.assertTrue(spanBuilderData.isPresent());
+        Assertions.assertEquals(spanBuilderValue, spanBuilderData.get());
+
+        final Optional<Object> spanBuilderData1 = updatedContext.getData(spanBuilderKey1);
+        Assertions.assertTrue(spanBuilderData1.isPresent());
+        Assertions.assertEquals(spanBuilderValue1, spanBuilderData1.get());
+    }
 }

sdk/core/azure-core-tracing-opencensus/src/main/java/com/azure/core/tracing/opencensus/OpenCensusTracer.java

@@ -181,6 +181,13 @@ public Context extractContext(String diagnosticId, Context context) {
         return AmqpPropagationFormatUtil.extractContext(diagnosticId, context);
     }
 
+    @Override
+    public Context getSharedSpanBuilder(String spanName, Context context) {
+        throw logger.logExceptionAsError(
+                new UnsupportedOperationException("This operation is not supported in OpenCensus"));
+        // Remove OpenCensus support for tracing in https://github.com/Azure/azure-sdk-for-java/issues/6781
+    }
+
     /**
      * Starts a new child {@link Span} with parent being the remote and uses the {@link Span} is in the current Context,
      * to return an object that represents that scope.

sdk/core/azure-core-tracing-opentelemetry/CHANGELOG.md

@@ -1,7 +1,8 @@
 # Release History
 ## Version 1.0.0-beta.2 (2020-01-03)
-- Add eventhub properties to attributes of processing spans.
+- Add `EventHubs.*` properties to attributes of processing spans.
 - Remove `Azure` prefix from convenience layer span names.
+- Add links for batch send operation in Event Hubs client library. 
 
 This package's
 [documentation](https://github.com/Azure/azure-sdk-for-java/blob/azure-core-tracing-opentelemetry_1.0.0-beta.2/sdk/core/azure-core-tracing-opentelemetry/README.md)
@@ -19,4 +20,3 @@ This package's
 [documentation](https://github.com/Azure/azure-sdk-for-java/blob/azure-core-tracing-opentelemetry_1.0.0-beta.1/sdk/core/azure-core-tracing-opentelemetry/README.md)
 and
 [samples](https://github.com/Azure/azure-sdk-for-java/blob/azure-core-tracing-opentelemetry_1.0.0-beta.1/sdk/core/azure-core-tracing-opentelemetry/src/samples).
-

sdk/core/azure-core-tracing-opentelemetry/src/main/java/com/azure/core/tracing/opentelemetry/OpenTelemetryTracer.java

@@ -66,7 +66,11 @@ public Context start(String spanName, Context context, ProcessKind processKind)
 
         switch (processKind) {
             case SEND:
-                spanBuilder = getSpanBuilder(spanName, context);
+                // use previously created span builder from the LINK process.
+                spanBuilder = getOrDefault(context, SPAN_BUILDER_KEY, null, Builder.class);
+                if (spanBuilder == null) {
+                    return Context.NONE;
+                }
                 span = spanBuilder.setSpanKind(Span.Kind.PRODUCER).startSpan();
                 if (span.isRecording()) {
                     // If span is sampled in, add additional request attributes
@@ -172,6 +176,11 @@ public Context extractContext(String diagnosticId, Context context) {
         return AmqpPropagationFormatUtil.extractContext(diagnosticId, context);
     }
 
+    @Override
+    public Context getSharedSpanBuilder(String spanName, Context context) {
+        return context.addData(SPAN_BUILDER_KEY, getSpanBuilder(spanName, context));
+    }
+
     /**
      * Starts a new child {@link Span} with parent being the remote and uses the {@link Span} is in the current Context,
      * to return an object that represents that scope.

sdk/core/azure-core-tracing-opentelemetry/src/samples/PublishEventsTracingSample.md

@@ -60,6 +60,7 @@ public class Sample {
     private static final Logger LOGGER = getLogger("Sample");
     private static  final Tracer TRACER;
     private static final TracerSdkFactory TRACER_SDK_FACTORY;
+    private static final Duration OPERATION_TIMEOUT = Duration.ofSeconds(30);
 
     static {
         TRACER_SDK_FACTORY = configureOpenTelemetryAndLoggingExporter();
@@ -80,35 +81,66 @@ public class Sample {
     }
 
     private static void doClientWork() {
-        EventHubProducerClient producer = new EventHubClientBuilder()
-            .connectionString(connectionString)
-            .buildProducerClient();
+        EventHubProducerAsyncClient producer = new EventHubClientBuilder()
+            .connectionString(CONNECTION_STRING)
+            .buildAsyncProducerClient();
 
         Span span = TRACER.spanBuilder("user-parent-span").startSpan();
         try (final Scope scope = TRACER.withSpan(span)) {
-            final EventData event1 = new EventData("1".getBytes(UTF_8));
-            event1.addContext(PARENT_SPAN_KEY, span);
-
-            final EventData event2 = new EventData("2".getBytes(UTF_8));
-            event2.addContext(PARENT_SPAN_KEY, span);
+            String firstPartition = producer.getPartitionIds().blockFirst(OPERATION_TIMEOUT);
+
+            final byte[] body = "EventData Sample 1".getBytes(UTF_8);
+            final byte[] body2 = "EventData Sample 2".getBytes(UTF_8);
 
-            final List<EventData> telemetryEvents = Arrays.asList(event1, event2);
+            // We will publish three events based on simple sentences.
+            Flux<EventData> data = Flux.just(
+                new EventData(body).addContext(PARENT_SPAN_KEY, TRACER.getCurrentSpan()),
+                new EventData(body2).addContext(PARENT_SPAN_KEY, TRACER.getCurrentSpan()));
+
+            // Create a batch to send the events.
             final CreateBatchOptions options = new CreateBatchOptions()
-                .setPartitionKey("telemetry")
+                .setPartitionId(firstPartition)
                 .setMaximumSizeInBytes(256);
-    
-            EventDataBatch currentBatch = producer.createBatch(options);
-
-            // For each telemetry event, we try to add it to the current batch.
-            for (EventData event : telemetryEvents) {
-                if (!currentBatch.tryAdd(event)) {
-                    producer.send(currentBatch);
-                    currentBatch = producer.createBatch(options);
+
+            final AtomicReference<EventDataBatch> currentBatch = new AtomicReference<>(
+                producer.createBatch(options).block(OPERATION_TIMEOUT));
+
+            data.flatMap(event -> {
+                final EventDataBatch batch = currentBatch.get();
+                if (batch.tryAdd(event)) {
+                    return Mono.empty();
                 }
-            }
-        } finally {
-            span.end();
-            producer.close();
+
+                // The batch is full, so we create a new batch and send the batch. Mono.when completes when both operations
+                // have completed.
+                return Mono.when(
+                        producer.send(batch),
+                        producer.createBatch(options).map(newBatch -> {
+                            currentBatch.set(newBatch);
+
+                            // Add that event that we couldn't before.
+                            if (!newBatch.tryAdd(event)) {
+                                throw Exceptions.propagate(new IllegalArgumentException(String.format(
+                                        "Event is too large for an empty batch. Max size: %s. Event: %s",
+                                        newBatch.getMaxSizeInBytes(), event.getBodyAsString())));
+                            }
+
+                            return newBatch;
+                        }));
+            }).then()
+                    .doFinally(signal -> {
+                        final EventDataBatch batch = currentBatch.getAndSet(null);
+                        if (batch != null) {
+                            producer.send(batch).block(OPERATION_TIMEOUT);
+                        }
+                    })
+                    .subscribe(unused -> System.out.println("Complete"),
+                            error -> System.out.println("Error sending events: " + error),
+                            () -> {
+                                span.end();
+                                producer.close();
+                                System.out.println("Completed sending events.");
+                            });
         }
     }
 }

sdk/core/azure-core-tracing-opentelemetry/src/test/java/com/azure/core/tracing/opentelemetry/OpenTelemetryTracerTest.java

@@ -92,7 +92,6 @@ public void startSpanParentContextFlowTest() {
         final ReadableSpan recordEventsSpan =
             (ReadableSpan) updatedContext.getData(PARENT_SPAN_KEY).get();
         assertEquals(Span.Kind.INTERNAL, recordEventsSpan.toSpanData().getKind());
-        assertEquals(true, true);
     }
 
     @Test
@@ -117,9 +116,11 @@ public void startSpanTestNoUserParent() {
     public void startSpanProcessKindSend() {
         // Arrange
         final SpanId parentSpanId = parentSpan.getContext().getSpanId();
+        // Start user parent span.
+        final Span.Builder spanBuilder = tracer.spanBuilder(METHOD_NAME);
         // Add additional metadata to spans for SEND
         final Context traceContext = tracingContext.addData(ENTITY_PATH_KEY, ENTITY_PATH_VALUE)
-            .addData(HOST_NAME_KEY, HOSTNAME_VALUE);
+            .addData(HOST_NAME_KEY, HOSTNAME_VALUE).addData(SPAN_BUILDER_KEY, spanBuilder);
 
         // Act
         final Context updatedContext = openTelemetryTracer.start(METHOD_NAME, traceContext, ProcessKind.SEND);
@@ -181,6 +182,14 @@ public void startSpanProcessKindProcess() {
         verifySpanAttributes(attributeMap);
     }
 
+    @Test
+    public void getSpanBuilderTest() {
+        // Act
+        final Context updatedContext = openTelemetryTracer.getSharedSpanBuilder(METHOD_NAME, Context.NONE);
+
+        assertTrue(updatedContext.getData(SPAN_BUILDER_KEY).isPresent());
+    }
+
     @Test
     public void startProcessSpanWithRemoteParent() {
         // Arrange
@@ -277,7 +286,7 @@ public void endSpanTestThrowableResponseCode() {
     }
 
     private static void assertSpanWithExplicitParent(Context updatedContext, SpanId parentSpanId) {
-        assertNotNull(updatedContext.getData(PARENT_SPAN_KEY));
+        assertNotNull(updatedContext.getData(PARENT_SPAN_KEY).get());
 
         // verify instance created of opentelemetry-sdk (test impl), span implementation
         assertTrue(updatedContext.getData(PARENT_SPAN_KEY).get() instanceof ReadableSpan);
@@ -292,7 +301,7 @@ private static void assertSpanWithExplicitParent(Context updatedContext, SpanId
     }
 
     private static void assertSpanWithRemoteParent(Context updatedContext, SpanId parentSpanId) {
-        assertNotNull(updatedContext.getData(PARENT_SPAN_KEY));
+        assertNotNull(updatedContext.getData(PARENT_SPAN_KEY).get());
 
         // verify instance created of opentelemetry-sdk (test impl), span implementation
         assertTrue(updatedContext.getData(PARENT_SPAN_KEY).get() instanceof ReadableSpan);

sdk/core/azure-core/src/main/java/com/azure/core/util/tracing/Tracer.java

@@ -204,4 +204,23 @@ public interface Tracer {
      * @throws NullPointerException if {@code diagnosticId} or {@code context} is {@code null}.
      */
     Context extractContext(String diagnosticId, Context context);
+
+    /**
+     * Returns a span builder with the provided name in {@link Context}.
+     *
+     * <p><strong>Code samples</strong></p>
+     *
+     * <p>Returns a builder with the provided span name.</p>
+     * {@codesnippet com.azure.core.util.tracing.getSharedSpanBuilder#string-context}
+     *
+     * @param spanName Name to give the span for the created builder.
+     * @param context Additional metadata that is passed through the call stack.
+     *
+     * @return The updated {@link Context} object containing the span builder.
+     * @throws NullPointerException if {@code context} or {@code spanName} is {@code null}.
+     */
+    default Context getSharedSpanBuilder(String spanName, Context context) {
+        // no-op
+        return Context.NONE;
+    }
 }

sdk/core/azure-core/src/samples/java/com/azure/core/util/tracing/TracerJavaDocCodeSnippets.java

@@ -7,6 +7,7 @@
 import static com.azure.core.util.tracing.Tracer.ENTITY_PATH_KEY;
 import static com.azure.core.util.tracing.Tracer.HOST_NAME_KEY;
 import static com.azure.core.util.tracing.Tracer.PARENT_SPAN_KEY;
+import static com.azure.core.util.tracing.Tracer.SPAN_BUILDER_KEY;
 
 /**
  * Contains code snippets when generating javadocs through doclets for {@link Tracer}.
@@ -120,6 +121,18 @@ public void extractContext() {
         // END: com.azure.core.util.tracing.extractContext#string-context
     }
 
+    /**
+     * Code snippet for {@link Tracer#getSharedSpanBuilder(String, Context)}
+     */
+    public void getSharedSpanBuilder() {
+        // BEGIN: com.azure.core.util.tracing.getSpanBuilder#string-context
+        // Returns a span builder with the provided name
+        String methodName = "message-span";
+        Context spanContext = tracer.getSharedSpanBuilder(methodName, Context.NONE);
+        System.out.printf("Span context of the current tracing span: %s%n", spanContext.getData(SPAN_BUILDER_KEY).get());
+        // END: com.azure.core.util.tracing.getSpanBuilder#string-context
+    }
+
     //Noop Tracer
     private static final class TracerImplementation implements Tracer {
         @Override
@@ -161,5 +174,10 @@ public void addLink(Context context) {
         public Context extractContext(String diagnosticId, Context context) {
             return null;
         }
+
+        @Override
+        public Context getSharedSpanBuilder(String spanName, Context context) {
+            return null;
+        }
     }
 }

sdk/eventhubs/azure-messaging-eventhubs/src/main/java/com/azure/messaging/eventhubs/EventData.java

@@ -254,7 +254,7 @@ Context getContext() {
      * @throws NullPointerException if {@code key} or {@code value} is null.
      * @return The updated {@link EventData}.
      */
-    EventData addContext(String key, Object value) {
+    public EventData addContext(String key, Object value) {
         Objects.requireNonNull(key, "The 'key' parameter cannot be null.");
         Objects.requireNonNull(value, "The 'value' parameter cannot be null.");
         this.context = context.addData(key, value);