Leader Election Pattern (#923)

* Fix issue #761: ThreadSafeDoubleCheckLocking.java: Instantiating by Reflection call will be successful if you do that firstly * Create leader election module * Create Interface of Instance and MessageManager * Create implementations with token ring algorithm * Change package structure. Create basic message system. * Implement heartbeat and heartbeat invoking message system * Implement election message handler * Add leader message handler * Add main entry point * Add comments * Update README.md * Fix checkstyle issue * Add Unit Tests * Add Unit Tests * Add bully leader selection * Change System.out to log print. Add MIT license in each file. * Add More java doc comments * Add unit test * Add unit tests
2019-10-08 23:29:59 +08:00
parent 41b8d80479
commit 90ea4506ca
22 changed files with 1719 additions and 0 deletions
--- a/leader-election/src/main/java/com/iluwatar/leaderelection/Message.java
+++ b/leader-election/src/main/java/com/iluwatar/leaderelection/Message.java
@ -0,0 +1,76 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ *
+ * 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:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 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.leaderelection;
+
+import java.util.Objects;
+
+/**
+ *  Message used to transport data between instances.
+ */
+public class Message {
+
+  private MessageType type;
+
+  private String content;
+
+  public Message() {}
+
+  public Message(MessageType type, String content) {
+    this.type = type;
+    this.content = content;
+  }
+
+  public MessageType getType() {
+    return type;
+  }
+
+  public void setType(MessageType type) {
+    this.type = type;
+  }
+
+  public String getContent() {
+    return content;
+  }
+
+  public void setContent(String content) {
+    this.content = content;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Message message = (Message) o;
+    return type == message.type && Objects.equals(content, message.content);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(type, content);
+  }
+}