Merge pull request #44 from pragnagopa/cardinality

Add support to specify Cadinality on the EventHubTrigger

src/main/java/com/microsoft/azure/functions/annotation/Cardinality.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for
+ * license information.
+ */
+
+package com.microsoft.azure.functions.annotation;
+
+/**
+ * <p>Cardinality of the EventHubTrigger input. Choose 'ONE' if the input is a single message or 'Many' if the input is an array of messages. 'Many' is the default if unspecified</p>
+ *
+ * @since 1.0.0
+ */
+public enum Cardinality {
+    /**
+     * To receive a single message,  set cardinality to ONE
+     */
+    ONE,
+
+    /**
+     * To receive events in a batch, set cardinality to MANY. This is the default if omitted.
+     */
+    MANY    
+}

src/main/java/com/microsoft/azure/functions/annotation/EventHubTrigger.java

@@ -59,6 +59,13 @@ public @interface EventHubTrigger {
      */
     String eventHubName();
 
+    /**
+     * Cardinality of the trigger input. Choose 'One' if the input is a single message or 'Many' if the input is an array of messages. 'Many' is the default if unspecified
+     * @return An {@link Cardinality} value representing the Cardinality
+     */
+    Cardinality cardinality() default Cardinality.MANY;
+
+
     /**
      * Defines the consumer group of the event hub to which to bind.
      * @return The event hub consumer group string.