cleaned and made ready task 1

week3_TinsaeGhilay/Task 1/src/engine/ComputeEngine.java

@@ -0,0 +1,58 @@
+
+package engine;
+
+import java.rmi.RemoteException;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+import java.rmi.server.UnicastRemoteObject;
+
+// needs the compute and task interfaces from compute package
+// define constructor for each
+// and provide an implementation for each remote method in the remote interfaces
+import compute.Compute;
+import compute.Task;
+
+/**
+ * The implementation of the Compute interface for the compute engine.
+ * it has to declare the remote class to be implemented (in this case Compute
+ * (implements it)
+ */
+public class ComputeEngine implements Compute {
+
+    public ComputeEngine() {
+        super();
+    }
+
+    @Override
+    public <T> T executeTask(Task<T> t) throws RemoteException {
+        return t.execute();
+    }
+
+    // entry
+    public static void main(String[] args) {
+
+        // the code provided on the tutorial was deprecated.
+        // so google led me to
+        // [this](https://docs.oracle.com/javase/8/docs/technotes/guides/rmi/hello/hello-world.html#create)
+        try {
+            String name = "Compute";
+            // create remote object that provides service (server).
+            Compute engine = new ComputeEngine();
+
+            // and export remote object to java RMI runtime
+            // so it may receive remote incoming calls
+            Compute stub = (Compute) UnicastRemoteObject.exportObject(engine, 0);
+
+            // the register the remote object with java RMI registry
+            // the registry is a name service that allows clients get a reference of remote
+            // objects
+            // once a remote object is registered, callers can look up the object by name
+            // and obtain its remote object reference
+            Registry registry = LocateRegistry.getRegistry();
+            registry.rebind(name, stub);
+            System.out.println("ComputeEngine bound");
+        } catch (Exception e) {
+            System.err.println("ComputeEngine exception: " + e.getMessage());
+        }
+    }
+}