Task 1 - develop a client

src/main/java/CalculatorClient.java

@@ -0,0 +1,36 @@
+import ch.sdi.calc.CalculatorGrpc;
+import ch.sdi.calc.CalculatorOuterClass;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+
+public class CalculatorClient {
+
+    private ManagedChannel channel;
+    private final CalculatorGrpc.CalculatorBlockingStub blockingStub;
+
+    public CalculatorClient(String host, int port) {
+        this(ManagedChannelBuilder.forAddress(host, port).usePlaintext());
+    }
+    private CalculatorClient(ManagedChannelBuilder<?> channelBuilder) {
+        channel = channelBuilder.build();
+        blockingStub = CalculatorGrpc.newBlockingStub(channel);
+    }
+
+    public double calculate(String expression) {
+        CalculatorOuterClass.CalculatorRequest request = CalculatorOuterClass.CalculatorRequest.newBuilder().setExpression(expression).build();
+        CalculatorOuterClass.CalculatorResponse response;
+        response = blockingStub.calculate(request);
+        return response.getResult();
+    }
+
+    public static void main(String[] args) {
+        CalculatorClient client = new CalculatorClient("calc.sdi.hevs.ch", 80);
+
+        for(int i = 0; i<10; i++) {
+            String expression = String.valueOf(i) + "+" + String.valueOf(i);
+            System.out.println("Expression: " + expression);
+            double answer = client.calculate(expression);
+            System.out.println("Answer: " + answer);
+        }
+    }
+}