afedulov commented on a change in pull request #211:
URL: https://github.com/apache/flink-statefun/pull/211#discussion_r595073904
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File path: docs/content/docs/sdk/java.md
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@@ -29,451 +29,395 @@ under the License.
Stateful functions are the building blocks of applications; they are atomic
units of isolation, distribution, and persistence.
As objects, they encapsulate the state of a single entity (e.g., a specific
user, device, or session) and encode its behavior.
Stateful functions can interact with each other, and external systems, through
message passing.
-The Java SDK is supported as an [embedded module]({{< ref
"docs/sdk/overview#embedded-module" >}}).
To get started, add the Java SDK as a dependency to your application.
-{{< artifact statefun-sdk >}}
+{{< artifact statefun-sdk-java >}}
## Defining A Stateful Function
-A stateful function is any class that implements the ``StatefulFunction``
interface.
-The following is an example of a simple hello world function.
+A stateful function is any class that implements the `StatefulFunction`
interface.
+In the following example, a `StatefulFunction` maintains a count for every user
+of an application, emitting a customized greeting.
```java
-package org.apache.flink.statefun.docs;
-
-import org.apache.flink.statefun.sdk.Context;
-import org.apache.flink.statefun.sdk.StatefulFunction;
-
-public class FnHelloWorld implements StatefulFunction {
+import java.util.concurrent.CompletableFuture;
+import org.apache.flink.statefun.sdk.java.Context;
+import org.apache.flink.statefun.sdk.java.StatefulFunction;
+import org.apache.flink.statefun.sdk.java.TypeName;
+import org.apache.flink.statefun.sdk.java.ValueSpec;
+import org.apache.flink.statefun.sdk.java.message.Message;
- @Override
- public void invoke(Context context, Object input) {
- System.out.println("Hello " + input.toString());
- }
-}
-```
+public class GreeterFn implements StatefulFunction {
-Functions process each incoming message through their ``invoke`` method.
-Input's are untyped and passed through the system as a ``java.lang.Object`` so
one function can potentially process multiple types of messages.
+ static final TypeName TYPE =
TypeName.forNameFromString("com.example.fns/greeter");
Review comment:
forNameFromString => typeNameFromString
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