spring-cloud-function/openwhisk-quick-start.html

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<p>Implement a POF (be sure to use the <code>functions</code> package):</p>
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<pre class="highlightjs highlight"><code>package functions;

import java.util.function.Function;

public class Uppercase implements Function&lt;String, String&gt; {

	public String apply(String input) {
		return input.toUpperCase();
	}
}</code></pre>
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<p>Install it into your local Maven repository:</p>
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<pre class="highlightjs highlight"><code>./mvnw clean install</code></pre>
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<p>Create a <code>function.properties</code> file that provides its Maven coordinates. For example:</p>
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<pre class="highlightjs highlight"><code>dependencies.function: com.example:pof:0.0.1-SNAPSHOT</code></pre>
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<p>Copy the openwhisk runner JAR to the working directory (same directory as the properties file):</p>
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<pre class="highlightjs highlight"><code>cp spring-cloud-function-adapters/spring-cloud-function-adapter-openwhisk/target/spring-cloud-function-adapter-openwhisk-2.0.0.BUILD-SNAPSHOT.jar runner.jar</code></pre>
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<p>Generate a m2 repo from the <code>--thin.dryrun</code> of the runner JAR with the above properties file:</p>
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<pre class="highlightjs highlight"><code>java -jar -Dthin.root=m2 runner.jar --thin.name=function --thin.dryrun</code></pre>
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<p>Use the following Dockerfile:</p>
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<pre class="highlightjs highlight"><code>FROM openjdk:8-jdk-alpine
VOLUME /tmp
COPY m2 /m2
ADD runner.jar .
ADD function.properties .
ENV JAVA_OPTS=""
ENTRYPOINT [ "java", "-Djava.security.egd=file:/dev/./urandom", "-jar", "runner.jar", "--thin.root=/m2", "--thin.name=function", "--function.name=uppercase"]
EXPOSE 8080</code></pre>
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you could use a Spring Cloud Function app, instead of just a jar with a POF in it, in which case you would have to change the way the app runs in the container so that it picks up the main class as a source file. For example, you could change the <code>ENTRYPOINT</code> above and add <code>--spring.main.sources=com.example.SampleApplication</code>.
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<p>Build the Docker image:</p>
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<pre class="highlightjs highlight"><code>docker build -t [username/appname] .</code></pre>
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<p>Push the Docker image:</p>
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<pre class="highlightjs highlight"><code>docker push [username/appname]</code></pre>
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<p>Use the OpenWhisk CLI (e.g. after <code>vagrant ssh</code>) to create the action:</p>
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<pre class="highlightjs highlight"><code>wsk action create example --docker [username/appname]</code></pre>
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<p>Invoke the action:</p>
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<pre class="highlightjs highlight"><code>wsk action invoke example --result --param payload foo
{
    "result": "FOO"
}</code></pre>
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