fix: AzureFunction implements AutoCloseable (#67)

azure-function/src/main/java/io/micronaut/azure/function/AzureFunction.java

@@ -16,15 +16,19 @@
 package io.micronaut.azure.function;
 
 import io.micronaut.context.ApplicationContext;
+import io.micronaut.context.ApplicationContextProvider;
 import io.micronaut.context.env.Environment;
 
+import java.io.Closeable;
+import java.io.IOException;
+
 /**
  * A base Azure function class that sets up the Azure environment and preferred configuration.
  *
  * @author graemerocher
  * @since 1.0.0
  */
-public abstract class AzureFunction {
+public abstract class AzureFunction implements ApplicationContextProvider, Closeable {
     protected static ApplicationContext applicationContext;
 
     static {
@@ -42,6 +46,19 @@ public void run() {
         }));
     }
 
+    @Override
+    public ApplicationContext getApplicationContext() {
+        return this.applicationContext;
+    }
+
+    @Override
+    public void close() throws IOException {
+        if (applicationContext != null) {
+            applicationContext.close();
+            applicationContext = null;
+        }
+    }
+
     /**
      * Default constructor.
      */

azure-function/src/test/groovy/io/micronaut/azure/function/AzureFunctionSpec.groovy

@@ -0,0 +1,15 @@
+package io.micronaut.azure.function
+
+import spock.lang.Specification
+
+class AzureFunctionSpec extends Specification {
+
+    void "AzureFunction implements AutoCloseable"() {
+        expect:
+        new FooFunction() instanceof AutoCloseable
+    }
+
+    static class FooFunction extends AzureFunction {
+
+    }
+}