add example of progressive call results

Author: muzzammilshahid

demo-gallery/src/main/java/io/crossbar/autobahn/demogallery/ProgressiveCallResultsExample.java

@@ -0,0 +1,62 @@
+package io.crossbar.autobahn.demogallery;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+
+import io.crossbar.autobahn.wamp.Client;
+import io.crossbar.autobahn.wamp.Session;
+import io.crossbar.autobahn.wamp.types.CallOptions;
+import io.crossbar.autobahn.wamp.types.CallResult;
+import io.crossbar.autobahn.wamp.types.ExitInfo;
+import io.crossbar.autobahn.wamp.types.InvocationDetails;
+import io.crossbar.autobahn.wamp.types.InvocationResult;
+import io.crossbar.autobahn.wamp.types.Registration;
+
+public class ProgressiveCallResultsExample {
+
+    public static CompletableFuture<ExitInfo> registerProgressive(String wsAddress, String realm) {
+        Session wampSession = new Session();
+        wampSession.addOnJoinListener((session, details) -> {
+            CompletableFuture<Registration> regFuture = session.register(
+                    "io.crossbar.longop",
+                    (List<Object> args, Map<String, Object> kwargs, InvocationDetails invocationDetails) -> {
+                        for (int i = 0; i < 5; i++) {
+                            List<Object> argsList = new ArrayList<>();
+                            argsList.add(i);
+                            invocationDetails.progress.sendProgress(argsList, null);
+                        }
+                        List<Object> resultArgs = new ArrayList<>();
+                        resultArgs.add(7);
+                        return CompletableFuture.completedFuture(new InvocationResult(resultArgs));
+                    });
+
+            regFuture.whenComplete((registration, throwable) -> {
+                System.out.println(String.format(
+                        "Registered procedure %s", registration.procedure));
+            });
+        });
+
+        Client wampClient = new Client(wampSession, wsAddress, realm);
+        return wampClient.connect();
+    }
+
+
+    public static CompletableFuture<ExitInfo> callProgressive(String wsAddress, String realm) {
+        Session wampSession = new Session();
+        wampSession.addOnJoinListener((session, details) -> {
+            CompletableFuture<CallResult> callFuture = session.call(
+                    "io.crossbar.longop",
+                    new CallOptions(result -> System.out.println("Receive Progress: " + result.results)));
+
+            callFuture.whenComplete((callResult, throwable) -> {
+                System.out.println(String.format("Call result: %s", callResult.results));
+            });
+        });
+
+        Client wampClient = new Client(wampSession, wsAddress, realm);
+        return wampClient.connect();
+    }
+
+}