#467 data-bus: implement pattern

2026-05-15 03:01:12 +00:00 · 2017-03-05 12:15:59 +00:00
parent eecffb0ea5
commit 3fd6887975
12 changed files with 555 additions and 1 deletions
@@ -0,0 +1,63 @@
+/**
+ * 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.members;
+
+import com.iluwatar.databus.DataType;
+import com.iluwatar.databus.Member;
+import com.iluwatar.databus.data.MessageData;
+import com.iluwatar.databus.data.StartingData;
+import com.iluwatar.databus.data.StoppingData;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * Receiver of Data-Bus events.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+@Slf4j
+@RequiredArgsConstructor
+public class StatusMember implements Member {
+
+  private final int id;
+
+  @Override
+  public void accept(final DataType data) {
+    if (data instanceof StartingData) {
+      handleEvent((StartingData) data);
+    } else if (data instanceof StoppingData) {
+      handleEvent((StoppingData) data);
+    }
+  }
+
+  private void handleEvent(StartingData data) {
+    log.info("Receiver #{} sees application started at {}", id, data.getWhen());
+  }
+
+  private void handleEvent(StoppingData data) {
+    log.info("Receiver #{} sees application stopping at {}", id, data.getWhen());
+    log.info("Receiver #{} sending goodbye message", id);
+    data.getDataBus().publish(MessageData.of(String.format("Goodbye cruel world from #%d!", id)));
+  }
+}