Add Retry annotation

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.microsoft.azure.functions</groupId>
 	<artifactId>azure-functions-java-library</artifactId>
-	<version>1.4.1-SNAPSHOT</version>
+	<version>1.5.0-SNAPSHOT</version>
 	<packaging>jar</packaging>
 	<parent>
 		<groupId>com.microsoft.maven</groupId>

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

@@ -0,0 +1,48 @@
+/**
+ * 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;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * <p>
+ * Defines Retry Policy</p>
+ *
+ * @since 1.0.0
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface Retry {
+    /**
+     * The strategy of retry
+     * @return The retry strategy
+     */
+    RetryStrategy strategy();
+    /**
+     * The maximum number of retries that will be attempted.
+     * @return The maximum retry count.
+     */
+    int maxRetryCount();
+    /**
+     * The minimum delay interval.
+     * @return The minimum retry delay.
+     */
+    String minimumInterval() default "";
+    /**
+     * The maximum delay interval.
+     * @return The maximum retry delay.
+     */
+    String maximumInterval() default "";
+    /**
+     * The delay between retries.
+     * @return The delay interval.
+     */
+    String delayInterval() default "";
+}

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

@@ -0,0 +1,27 @@
+/**
+ * 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>
+ * Strategy of the Retry annotation. Choose 'EXPONENTIAL' if you use  the exponential back off strategy or 'FIXED'
+ * if you use the fixed delay strategy. For more details, refer to https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-error-pages?tabs=csharp#function-level-configuration .
+ * </p>
+ *
+ * @since 1.0.0
+ */
+public enum RetryStrategy {
+    /**
+     * Defines an exponential backoff retry strategy, where the delay between retries
+     * will get progressively larger, limited by the max/min specified.
+     */
+    EXPONENTIAL,
+    /**
+     * Defines a retry strategy where a fixed delay is used between retries.
+     */
+    FIXED;
+}