#467 data-bus: implement pattern

data-bus/src/main/java/com/iluwatar/databus/App.java

@@ -0,0 +1,60 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ * <p>
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * <p>
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * <p>
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.databus;
+
+import com.iluwatar.databus.data.StoppingData;
+import com.iluwatar.databus.data.StartingData;
+import com.iluwatar.databus.data.MessageData;
+import com.iluwatar.databus.members.CounterMember;
+import com.iluwatar.databus.members.StatusMember;
+import lombok.extern.slf4j.Slf4j;
+
+import java.time.LocalDateTime;
+
+/**
+ * The Data Bus pattern
+ * <p>
+ * <p>{@see http://wiki.c2.com/?DataBusPattern}</p>
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+@Slf4j
+class App {
+
+  public static void main(String[] args) {
+    final DataBus bus = DataBus.getInstance();
+    bus.subscribe(new StatusMember(1));
+    bus.subscribe(new StatusMember(2));
+    final CounterMember foo = new CounterMember("Foo");
+    final CounterMember bar = new CounterMember("Bar");
+    bus.subscribe(foo);
+    bus.publish(StartingData.of(LocalDateTime.now()));
+    bus.publish(MessageData.of("Only Foo should see this"));
+    bus.subscribe(bar);
+    bus.publish(MessageData.of("Foo and Bar should see this"));
+    bus.unsubscribe(foo);
+    bus.publish(MessageData.of("Only Bar should see this"));
+    bus.publish(StoppingData.of(LocalDateTime.now()));
+  }
+}