diff --git a/src/main/java/com/microsoft/azure/functions/ExecutionContext.java b/src/main/java/com/microsoft/azure/functions/ExecutionContext.java
index 7874d10..af5e127 100644
--- a/src/main/java/com/microsoft/azure/functions/ExecutionContext.java
+++ b/src/main/java/com/microsoft/azure/functions/ExecutionContext.java
@@ -6,6 +6,8 @@
 
 package com.microsoft.azure.functions;
 
+import java.lang.reflect.Parameter;
+import java.util.Map;
 import java.util.logging.Logger;
 
 /**
@@ -50,5 +52,19 @@ default TraceContext getTraceContext() {
     default RetryContext getRetryContext() {
         return null;
     }
+
+    Map<String, Parameter> getParameterMap();
+
+    Map<String, String> getParameterPayloadMap();
+
+    void setMiddlewareInput(String key, Object value);
+
+    Object getReturnValue();
+
+    void setMiddlewareOutput(Object value);
+
+    void setFunctionInstance(Object functionInstance);
+
+    Class<?> getContainingClass();
 }
 
diff --git a/src/main/java/com/microsoft/azure/functions/middleware/FunctionWorkerChain.java b/src/main/java/com/microsoft/azure/functions/middleware/FunctionWorkerChain.java
new file mode 100644
index 0000000..b71741f
--- /dev/null
+++ b/src/main/java/com/microsoft/azure/functions/middleware/FunctionWorkerChain.java
@@ -0,0 +1,12 @@
+/**
+ * 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.middleware;
+
+import com.microsoft.azure.functions.ExecutionContext;
+
+public interface FunctionWorkerChain {
+    void doNext(ExecutionContext context) throws Exception;
+}
diff --git a/src/main/java/com/microsoft/azure/functions/middleware/FunctionWorkerMiddleware.java b/src/main/java/com/microsoft/azure/functions/middleware/FunctionWorkerMiddleware.java
new file mode 100644
index 0000000..ffdb51a
--- /dev/null
+++ b/src/main/java/com/microsoft/azure/functions/middleware/FunctionWorkerMiddleware.java
@@ -0,0 +1,12 @@
+/**
+ * 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.middleware;
+
+import com.microsoft.azure.functions.ExecutionContext;
+
+public interface FunctionWorkerMiddleware {
+    void invoke(ExecutionContext context, FunctionWorkerChain next) throws Exception;
+}