Monostate pattern #85

monostate/src/main/java/com/iluwatar/monostate/App.java

@@ -0,0 +1,11 @@
+package com.iluwatar.monostate;
+
+public class App {
+	public static void main(String[] args) {
+		LoadBalancer loadBalancer1 = new LoadBalancer();
+		LoadBalancer loadBalancer2 = new LoadBalancer();
+		loadBalancer1.serverequest(new Request("Hello"));
+		loadBalancer2.serverequest(new Request("Hello World"));
+	}
+
+}

monostate/src/main/java/com/iluwatar/monostate/LoadBalancer.java

@@ -0,0 +1,39 @@
+package com.iluwatar.monostate;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LoadBalancer {
+  private static List<Server> servers = new ArrayList<>();
+  private static int id = 0;
+  private static int lastServedId = 0;
+
+  static {
+    servers.add(new Server("localhost", 8081, ++id));
+    servers.add(new Server("localhost", 8080, ++id));
+    servers.add(new Server("localhost", 8082, ++id));
+    servers.add(new Server("localhost", 8083, ++id));
+    servers.add(new Server("localhost", 8084, ++id));
+  }
+
+  public final void addServer(Server server) {
+    synchronized (servers) {
+      servers.add(server);
+    }
+
+  }
+
+  public final int getNoOfServers() {
+    return servers.size();
+  }
+
+  public void serverequest(Request request) {
+    if (lastServedId >= servers.size()) {
+      lastServedId = 0;
+    }
+    Server server = servers.get(lastServedId++);
+    server.serve(request);
+  }
+
+
+}

monostate/src/main/java/com/iluwatar/monostate/Request.java

@@ -0,0 +1,10 @@
+package com.iluwatar.monostate;
+
+public class Request {
+  public final String value;
+
+  public Request(String value) {
+    super();
+    this.value = value;
+  }
+}

monostate/src/main/java/com/iluwatar/monostate/Server.java

@@ -0,0 +1,21 @@
+package com.iluwatar.monostate;
+
+public class Server {
+  public final String host;
+  public final int port;
+  public final int id;
+  public Server(String host, int port, int id) {
+    this.host = host;
+    this.port = port;
+    this.id = id;
+  }
+  public String getHost() {
+    return host;
+  }
+  public int getPort() {
+    return port;
+  }
+  public final void serve(Request request) {
+    System.out.println("Server ID "+id + "  processed request with value  "+request.value);
+  }
+}