Add usage example.

1 files changed, 53 insertions, 0 deletions

diff --git a/src/main/java/com/orbekk/example/ExampleClient.java b/src/main/java/com/orbekk/example/ExampleClient.java
new file mode 100644
index 0000000..63d8b17
--- /dev/null
+++ b/src/main/java/com/orbekk/example/ExampleClient.java
@@ -0,0 +1,53 @@
+package com.orbekk.example;
+
+import java.util.concurrent.CountDownLatch;
+
+import com.google.protobuf.RpcCallback;
+import com.orbekk.example.Example.FortuneReply;
+import com.orbekk.protobuf.Rpc;
+import com.orbekk.protobuf.RpcChannel;
+
+public class ExampleClient {
+    public void runClient(int port) {
+        RpcChannel channel = null;
+        try {
+            channel = RpcChannel.create("localhost", port);
+            Example.FortuneService service =
+                    Example.FortuneService.newStub(channel);
+            printFortune(service);
+        } finally {
+            if (channel != null) {
+                channel.close();
+            }
+        }
+        
+    }
+
+    public void printFortune(Example.FortuneService service) {
+        Rpc rpc = new Rpc();  // Represents a single rpc call.
+        Example.Empty request = Example.Empty.newBuilder().build();
+        
+        // An RPC call is asynchronous. A CountDownLatch is a nice way to wait
+        // for the callback to finish.
+        final CountDownLatch doneSignal = new CountDownLatch(1);
+        service.getFortune(rpc, request, new RpcCallback<Example.FortuneReply>() {
+            @Override public void run(FortuneReply reply) {
+                System.out.println(reply.getFortune());
+                doneSignal.countDown();
+            }
+        });
+        
+        try {
+            doneSignal.await();
+        } catch (InterruptedException e) {
+            System.out.println("Interrupted while waiting for fortune. :(");
+        }
+    }
+    public static void main(String[] args) {
+        if (args.length == 0) {
+            System.err.println("Usage: ExampleClient <port>");
+            System.exit(1);
+        }
+        new ExampleClient().runClient(Integer.valueOf(args[0]));
+    }
+}