initial commit for openwhisk support

spring-cloud-function-adapters/spring-cloud-function-adapter-openwhisk/README.md

@@ -0,0 +1,79 @@
+Implement a POF:
+
+```
+package functions;
+
+import java.util.function.Function;
+
+public class Uppercase implements Function<String, String> {
+
+	public String apply(String input) {
+		return input.toUpperCase();
+	}
+}
+```
+
+Install it into your local Maven repository:
+
+```
+./mvnw clean install
+```
+
+Create a `function.properties` file that provides its Maven coordinates. For example:
+
+```
+dependencies.function: io.spring.sample:uppercase-function:0.0.1-SNAPSHOT
+```
+
+Copy the openwhisk runner JAR to the working directory (same directory as the properties file):
+
+```
+cp spring-cloud-function-adapters/spring-cloud-function-adapter-openwhisk/target/spring-cloud-function-adapter-openwhisk-1.0.0.BUILD-SNAPSHOT.jar runner.jar
+```
+
+Generate a m2 repo from the `--thin.dryrun` of the runner JAR with the above properties file:
+
+```
+java -jar runner.jar --thin.root=m2 --thin.name=function --thin.dryrun
+```
+
+Use the following Dockerfile:
+
+```
+FROM openjdk:8
+
+COPY m2 /m2
+ADD runner.jar .
+ADD function.properties .
+
+ENTRYPOINT [ "sh", "-c", "java -Djava.security.egd=file:/dev/./urandom -jar runner.jar --thin.root=/m2 --thin.name=function --function.name=uppercase" ]
+
+EXPOSE 8080
+```
+
+Build the Docker image:
+
+```
+docker build -t [username/appname] .
+```
+
+Push the Docker image:
+
+```
+docker push [username/appname]
+```
+
+Use the OpenWhisk CLI (e.g. after `vagrant ssh`) to create the action:
+
+```
+wsk action create --docker example [username/appname]
+```
+
+Invoke the action:
+
+```
+wsk action invoke --result example --param payload foo
+{
+    "result": "FOO"
+}
+```