GH-600 Fix logic in Azure adapter to ensure proper handling of sveral functions

This also addresses re-initialization of AC when the second function is invoked
Added second function to the azure examples

Resolves #600

spring-cloud-function-samples/function-sample-azure/src/main/java/example/Config.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,6 +34,11 @@ public class Config {
 		SpringApplication.run(Config.class, args);
 	}
 
+	@Bean
+	public Function<Message<String>, String> echo() {
+		return message -> message.getPayload();
+	}
+
 	@Bean
 	public Function<Message<String>, String> uppercase(JsonMapper mapper) {
 		return message -> {
@@ -46,7 +51,8 @@ public class Config {
 					map.forEach((k, v) -> map.put(k, v != null ? v.toUpperCase() : null));
 
 				if(context != null)
-					context.getLogger().info(new StringBuilder().append("Function: ").append(context.getFunctionName()).append(" is uppercasing ").append(value.toString()).toString());
+					context.getLogger().info(new StringBuilder().append("Function: ")
+							.append(context.getFunctionName()).append(" is uppercasing ").append(value.toString()).toString());
 
 				return mapper.toString(map);
 			} catch (Exception e) {

spring-cloud-function-samples/function-sample-azure/src/main/java/example/EchoHandler.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example;
+
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.HttpMethod;
+import com.microsoft.azure.functions.HttpRequestMessage;
+import com.microsoft.azure.functions.annotation.AuthorizationLevel;
+import com.microsoft.azure.functions.annotation.FunctionName;
+import com.microsoft.azure.functions.annotation.HttpTrigger;
+
+import java.util.Optional;
+
+import org.springframework.cloud.function.adapter.azure.AzureSpringBootRequestHandler;
+
+/**
+ * @author Soby Chacko
+ */
+public class EchoHandler extends AzureSpringBootRequestHandler<String, String> {
+
+	@FunctionName("echo")
+	public String execute(@HttpTrigger(name = "req", methods = {HttpMethod.GET,
+			HttpMethod.POST}, authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
+		ExecutionContext context) {
+		return handleRequest(request.getBody().get(), context);
+	}
+
+}