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Java 11 support for #984 #987 (l) (#1190)

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* Java 11 support: lazy-loading pattern

* Java 11 support: layers pattern

* Java 11 support: leader-election/lazy-loading patterns
This commit is contained in:
Zhang WH
2020-03-23 02:02:45 +08:00
committed by GitHub
parent 0ad67c8726
commit 67edeb806d
23 changed files with 238 additions and 243 deletions
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6
leader-election/src/main/java/com/iluwatar/leaderelection/AbstractMessageManager.java
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@ -51,13 +51,13 @@ public abstract class AbstractMessageManager implements MessageManager {
*/
protected Instance findNextInstance(int currentId) {
Instance result = null;
List<Integer> candidateList = instanceMap.keySet()
var candidateList = instanceMap.keySet()
.stream()
.filter((i) -> i > currentId && instanceMap.get(i).isAlive())
.sorted()
.collect(Collectors.toList());
if (candidateList.isEmpty()) {
int index = instanceMap.keySet()
var index = instanceMap.keySet()
.stream()
.filter((i) -> instanceMap.get(i).isAlive())
.sorted()
@ -65,7 +65,7 @@ public abstract class AbstractMessageManager implements MessageManager {
.get(0);
result = instanceMap.get(index);
} else {
int index = candidateList.get(0);
var index = candidateList.get(0);
result = instanceMap.get(index);
}
return result;

2
leader-election/src/main/java/com/iluwatar/leaderelection/Message.java
View File

@ -66,7 +66,7 @@ public class Message {
if (o == null || getClass() != o.getClass()) {
return false;
}
Message message = (Message) o;
var message = (Message) o;
return type == message.type && Objects.equals(content, message.content);
}

22
leader-election/src/main/java/com/iluwatar/leaderelection/bully/BullyApp.java
View File

@ -43,13 +43,13 @@ public class BullyApp {
public static void main(String[] args) {
Map<Integer, Instance> instanceMap = new HashMap<>();
MessageManager messageManager = new BullyMessageManager(instanceMap);
var messageManager = new BullyMessageManager(instanceMap);
BullyInstance instance1 = new BullyInstance(messageManager, 1, 1);
BullyInstance instance2 = new BullyInstance(messageManager, 2, 1);
BullyInstance instance3 = new BullyInstance(messageManager, 3, 1);
BullyInstance instance4 = new BullyInstance(messageManager, 4, 1);
BullyInstance instance5 = new BullyInstance(messageManager, 5, 1);
var instance1 = new BullyInstance(messageManager, 1, 1);
var instance2 = new BullyInstance(messageManager, 2, 1);
var instance3 = new BullyInstance(messageManager, 3, 1);
var instance4 = new BullyInstance(messageManager, 4, 1);
var instance5 = new BullyInstance(messageManager, 5, 1);
instanceMap.put(1, instance1);
instanceMap.put(2, instance2);
@ -59,11 +59,11 @@ public class BullyApp {
instance4.onMessage(new Message(MessageType.HEARTBEAT_INVOKE, ""));
final Thread thread1 = new Thread(instance1);
final Thread thread2 = new Thread(instance2);
final Thread thread3 = new Thread(instance3);
final Thread thread4 = new Thread(instance4);
final Thread thread5 = new Thread(instance5);
final var thread1 = new Thread(instance1);
final var thread2 = new Thread(instance2);
final var thread3 = new Thread(instance3);
final var thread4 = new Thread(instance4);
final var thread5 = new Thread(instance5);
thread1.start();
thread2.start();

17
leader-election/src/main/java/com/iluwatar/leaderelection/bully/BullyMessageManager.java
View File

@ -51,8 +51,8 @@ public class BullyMessageManager extends AbstractMessageManager {
*/
@Override
public boolean sendHeartbeatMessage(int leaderId) {
Instance leaderInstance = instanceMap.get(leaderId);
boolean alive = leaderInstance.isAlive();
var leaderInstance = instanceMap.get(leaderId);
var alive = leaderInstance.isAlive();
return alive;
}
@ -65,13 +65,12 @@ public class BullyMessageManager extends AbstractMessageManager {
*/
@Override
public boolean sendElectionMessage(int currentId, String content) {
List<Integer> candidateList = findElectionCandidateInstanceList(currentId);
var candidateList = findElectionCandidateInstanceList(currentId);
if (candidateList.isEmpty()) {
return true;
} else {
Message electionMessage = new Message(MessageType.ELECTION_INVOKE, "");
candidateList.stream()
.forEach((i) -> instanceMap.get(i).onMessage(electionMessage));
var electionMessage = new Message(MessageType.ELECTION_INVOKE, "");
candidateList.stream().forEach((i) -> instanceMap.get(i).onMessage(electionMessage));
return false;
}
}
@ -85,7 +84,7 @@ public class BullyMessageManager extends AbstractMessageManager {
*/
@Override
public boolean sendLeaderMessage(int currentId, int leaderId) {
Message leaderMessage = new Message(MessageType.LEADER, String.valueOf(leaderId));
var leaderMessage = new Message(MessageType.LEADER, String.valueOf(leaderId));
instanceMap.keySet()
.stream()
.filter((i) -> i != currentId)
@ -100,8 +99,8 @@ public class BullyMessageManager extends AbstractMessageManager {
*/
@Override
public void sendHeartbeatInvokeMessage(int currentId) {
Instance nextInstance = this.findNextInstance(currentId);
Message heartbeatInvokeMessage = new Message(MessageType.HEARTBEAT_INVOKE, "");
var nextInstance = this.findNextInstance(currentId);
var heartbeatInvokeMessage = new Message(MessageType.HEARTBEAT_INVOKE, "");
nextInstance.onMessage(heartbeatInvokeMessage);
}

22
leader-election/src/main/java/com/iluwatar/leaderelection/ring/RingApp.java
View File

@ -43,13 +43,13 @@ public class RingApp {
public static void main(String[] args) {
Map<Integer, Instance> instanceMap = new HashMap<>();
MessageManager messageManager = new RingMessageManager(instanceMap);
var messageManager = new RingMessageManager(instanceMap);
RingInstance instance1 = new RingInstance(messageManager, 1, 1);
RingInstance instance2 = new RingInstance(messageManager, 2, 1);
RingInstance instance3 = new RingInstance(messageManager, 3, 1);
RingInstance instance4 = new RingInstance(messageManager, 4, 1);
RingInstance instance5 = new RingInstance(messageManager, 5, 1);
var instance1 = new RingInstance(messageManager, 1, 1);
var instance2 = new RingInstance(messageManager, 2, 1);
var instance3 = new RingInstance(messageManager, 3, 1);
var instance4 = new RingInstance(messageManager, 4, 1);
var instance5 = new RingInstance(messageManager, 5, 1);
instanceMap.put(1, instance1);
instanceMap.put(2, instance2);
@ -59,11 +59,11 @@ public class RingApp {
instance2.onMessage(new Message(MessageType.HEARTBEAT_INVOKE, ""));
final Thread thread1 = new Thread(instance1);
final Thread thread2 = new Thread(instance2);
final Thread thread3 = new Thread(instance3);
final Thread thread4 = new Thread(instance4);
final Thread thread5 = new Thread(instance5);
final var thread1 = new Thread(instance1);
final var thread2 = new Thread(instance2);
final var thread3 = new Thread(instance3);
final var thread4 = new Thread(instance4);
final var thread5 = new Thread(instance5);
thread1.start();
thread2.start();

17
leader-election/src/main/java/com/iluwatar/leaderelection/ring/RingInstance.java
View File

@ -62,7 +62,7 @@ public class RingInstance extends AbstractInstance {
@Override
protected void handleHeartbeatInvokeMessage() {
try {
boolean isLeaderAlive = messageManager.sendHeartbeatMessage(this.leaderId);
var isLeaderAlive = messageManager.sendHeartbeatMessage(this.leaderId);
if (isLeaderAlive) {
LOGGER.info("Instance " + localId + "- Leader is alive. Start next heartbeat in 5 second.");
Thread.sleep(HEARTBEAT_INTERVAL);
@ -84,15 +84,14 @@ public class RingInstance extends AbstractInstance {
*/
@Override
protected void handleElectionMessage(Message message) {
String content = message.getContent();
var content = message.getContent();
LOGGER.info("Instance " + localId + " - Election Message: " + content);
List<Integer> candidateList =
Arrays.stream(content.trim().split(","))
.map(Integer::valueOf)
.sorted()
.collect(Collectors.toList());
var candidateList = Arrays.stream(content.trim().split(","))
.map(Integer::valueOf)
.sorted()
.collect(Collectors.toList());
if (candidateList.contains(localId)) {
int newLeaderId = candidateList.get(0);
var newLeaderId = candidateList.get(0);
LOGGER.info("Instance " + localId + " - New leader should be " + newLeaderId + ".");
messageManager.sendLeaderMessage(localId, newLeaderId);
} else {
@ -107,7 +106,7 @@ public class RingInstance extends AbstractInstance {
*/
@Override
protected void handleLeaderMessage(Message message) {
int newLeaderId = Integer.valueOf(message.getContent());
var newLeaderId = Integer.valueOf(message.getContent());
if (this.leaderId != newLeaderId) {
LOGGER.info("Instance " + localId + " - Update leaderID");
this.leaderId = newLeaderId;

16
leader-election/src/main/java/com/iluwatar/leaderelection/ring/RingMessageManager.java
View File

@ -49,8 +49,8 @@ public class RingMessageManager extends AbstractMessageManager {
*/
@Override
public boolean sendHeartbeatMessage(int leaderId) {
Instance leaderInstance = instanceMap.get(leaderId);
boolean alive = leaderInstance.isAlive();
var leaderInstance = instanceMap.get(leaderId);
var alive = leaderInstance.isAlive();
return alive;
}
@ -64,8 +64,8 @@ public class RingMessageManager extends AbstractMessageManager {
*/
@Override
public boolean sendElectionMessage(int currentId, String content) {
Instance nextInstance = this.findNextInstance(currentId);
Message electionMessage = new Message(MessageType.ELECTION, content);
var nextInstance = this.findNextInstance(currentId);
var electionMessage = new Message(MessageType.ELECTION, content);
nextInstance.onMessage(electionMessage);
return true;
}
@ -79,8 +79,8 @@ public class RingMessageManager extends AbstractMessageManager {
*/
@Override
public boolean sendLeaderMessage(int currentId, int leaderId) {
Instance nextInstance = this.findNextInstance(currentId);
Message leaderMessage = new Message(MessageType.LEADER, String.valueOf(leaderId));
var nextInstance = this.findNextInstance(currentId);
var leaderMessage = new Message(MessageType.LEADER, String.valueOf(leaderId));
nextInstance.onMessage(leaderMessage);
return true;
}
@ -92,8 +92,8 @@ public class RingMessageManager extends AbstractMessageManager {
*/
@Override
public void sendHeartbeatInvokeMessage(int currentId) {
Instance nextInstance = this.findNextInstance(currentId);
Message heartbeatInvokeMessage = new Message(MessageType.HEARTBEAT_INVOKE, "");
var nextInstance = this.findNextInstance(currentId);
var heartbeatInvokeMessage = new Message(MessageType.HEARTBEAT_INVOKE, "");
nextInstance.onMessage(heartbeatInvokeMessage);
}

6
leader-election/src/test/java/com/iluwatar/leaderelection/MessageTest.java
View File

@ -34,14 +34,14 @@ public class MessageTest {
@Test
public void testGetType() {
Message message = new Message(MessageType.HEARTBEAT, "");
var message = new Message(MessageType.HEARTBEAT, "");
assertEquals(MessageType.HEARTBEAT, message.getType());
}
@Test
public void testGetContent() {
String content = "test";
Message message = new Message(MessageType.HEARTBEAT, content);
var content = "test";
var message = new Message(MessageType.HEARTBEAT, content);
assertEquals(content, message.getContent());
}

74
leader-election/src/test/java/com/iluwatar/leaderelection/bully/BullyMessageManagerTest.java
View File

@ -39,29 +39,29 @@ public class BullyMessageManagerTest {
@Test
public void testSendHeartbeatMessage() {
Instance instance1 = new BullyInstance(null, 1, 1);
var instance1 = new BullyInstance(null, 1, 1);
Map<Integer, Instance> instanceMap = Map.of(1, instance1);
MessageManager messageManager = new BullyMessageManager(instanceMap);
var messageManager = new BullyMessageManager(instanceMap);
assertTrue(messageManager.sendHeartbeatMessage(1));
}
@Test
public void testSendElectionMessageNotAccepted() {
try {
Instance instance1 = new BullyInstance(null, 1, 1);
Instance instance2 = new BullyInstance(null, 1, 2);
Instance instance3 = new BullyInstance(null, 1, 3);
Instance instance4 = new BullyInstance(null, 1, 4);
var instance1 = new BullyInstance(null, 1, 1);
var instance2 = new BullyInstance(null, 1, 2);
var instance3 = new BullyInstance(null, 1, 3);
var instance4 = new BullyInstance(null, 1, 4);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3, 4, instance4);
instance1.setAlive(false);
MessageManager messageManager = new BullyMessageManager(instanceMap);
boolean result = messageManager.sendElectionMessage(3, "3");
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var messageManager = new BullyMessageManager(instanceMap);
var result = messageManager.sendElectionMessage(3, "3");
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
Message message2 = ((Queue<Message>) messageQueueField.get(instance2)).poll();
int instance4QueueSize = ((Queue<Message>) messageQueueField.get(instance4)).size();
Message expectedMessage = new Message(MessageType.ELECTION_INVOKE, "");
var message2 = ((Queue<Message>) messageQueueField.get(instance2)).poll();
var instance4QueueSize = ((Queue<Message>) messageQueueField.get(instance4)).size();
var expectedMessage = new Message(MessageType.ELECTION_INVOKE, "");
assertEquals(message2, expectedMessage);
assertEquals(instance4QueueSize, 0);
assertEquals(result, false);
@ -72,34 +72,34 @@ public class BullyMessageManagerTest {
@Test
public void testElectionMessageAccepted() {
Instance instance1 = new BullyInstance(null, 1, 1);
Instance instance2 = new BullyInstance(null, 1, 2);
Instance instance3 = new BullyInstance(null, 1, 3);
Instance instance4 = new BullyInstance(null, 1, 4);
var instance1 = new BullyInstance(null, 1, 1);
var instance2 = new BullyInstance(null, 1, 2);
var instance3 = new BullyInstance(null, 1, 3);
var instance4 = new BullyInstance(null, 1, 4);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3, 4, instance4);
instance1.setAlive(false);
MessageManager messageManager = new BullyMessageManager(instanceMap);
boolean result = messageManager.sendElectionMessage(2, "2");
var messageManager = new BullyMessageManager(instanceMap);
var result = messageManager.sendElectionMessage(2, "2");
assertEquals(result, true);
}
@Test
public void testSendLeaderMessage() {
try {
Instance instance1 = new BullyInstance(null, 1, 1);
Instance instance2 = new BullyInstance(null, 1, 2);
Instance instance3 = new BullyInstance(null, 1, 3);
Instance instance4 = new BullyInstance(null, 1, 4);
var instance1 = new BullyInstance(null, 1, 1);
var instance2 = new BullyInstance(null, 1, 2);
var instance3 = new BullyInstance(null, 1, 3);
var instance4 = new BullyInstance(null, 1, 4);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3, 4, instance4);
instance1.setAlive(false);
MessageManager messageManager = new BullyMessageManager(instanceMap);
var messageManager = new BullyMessageManager(instanceMap);
messageManager.sendLeaderMessage(2, 2);
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
Message message3 = ((Queue<Message>) messageQueueField.get(instance3)).poll();
Message message4 = ((Queue<Message>) messageQueueField.get(instance4)).poll();
Message expectedMessage = new Message(MessageType.LEADER, "2");
var message3 = ((Queue<Message>) messageQueueField.get(instance3)).poll();
var message4 = ((Queue<Message>) messageQueueField.get(instance4)).poll();
var expectedMessage = new Message(MessageType.LEADER, "2");
assertEquals(message3, expectedMessage);
assertEquals(message4, expectedMessage);
} catch (IllegalAccessException | NoSuchFieldException e) {
@ -110,17 +110,17 @@ public class BullyMessageManagerTest {
@Test
public void testSendHeartbeatInvokeMessage() {
try {
Instance instance1 = new BullyInstance(null, 1, 1);
Instance instance2 = new BullyInstance(null, 1, 2);
Instance instance3 = new BullyInstance(null, 1, 3);
var instance1 = new BullyInstance(null, 1, 1);
var instance2 = new BullyInstance(null, 1, 2);
var instance3 = new BullyInstance(null, 1, 3);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3);
MessageManager messageManager = new BullyMessageManager(instanceMap);
var messageManager = new BullyMessageManager(instanceMap);
messageManager.sendHeartbeatInvokeMessage(2);
Message message = new Message(MessageType.HEARTBEAT_INVOKE, "");
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var message = new Message(MessageType.HEARTBEAT_INVOKE, "");
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
Message messageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
var messageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
assertEquals(messageSent.getType(), message.getType());
assertEquals(messageSent.getContent(), message.getContent());
} catch (NoSuchFieldException | IllegalAccessException e) {

16
leader-election/src/test/java/com/iluwatar/leaderelection/bully/BullyinstanceTest.java
View File

@ -41,11 +41,11 @@ public class BullyinstanceTest {
@Test
public void testOnMessage() {
try {
final BullyInstance bullyInstance = new BullyInstance(null, 1, 1);
Message bullyMessage = new Message(MessageType.HEARTBEAT, "");
final var bullyInstance = new BullyInstance(null, 1, 1);
var bullyMessage = new Message(MessageType.HEARTBEAT, "");
bullyInstance.onMessage(bullyMessage);
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
assertEquals(bullyMessage, ((Queue<Message>) messageQueueField.get(bullyInstance)).poll());
} catch (IllegalAccessException | NoSuchFieldException e) {
@ -57,9 +57,9 @@ public class BullyinstanceTest {
@Test
public void testIsAlive() {
try {
final BullyInstance bullyInstance = new BullyInstance(null, 1, 1);
Class instanceClass = AbstractInstance.class;
Field aliveField = instanceClass.getDeclaredField("alive");
final var bullyInstance = new BullyInstance(null, 1, 1);
var instanceClass = AbstractInstance.class;
var aliveField = instanceClass.getDeclaredField("alive");
aliveField.setAccessible(true);
aliveField.set(bullyInstance, false);
assertFalse(bullyInstance.isAlive());
@ -70,7 +70,7 @@ public class BullyinstanceTest {
@Test
public void testSetAlive() {
final BullyInstance bullyInstance = new BullyInstance(null, 1, 1);
final var bullyInstance = new BullyInstance(null, 1, 1);
bullyInstance.setAlive(false);
assertFalse(bullyInstance.isAlive());
}

16
leader-election/src/test/java/com/iluwatar/leaderelection/ring/RingInstanceTest.java
View File

@ -41,11 +41,11 @@ public class RingInstanceTest {
@Test
public void testOnMessage() {
try {
final RingInstance ringInstance = new RingInstance(null, 1, 1);
Message ringMessage = new Message(MessageType.HEARTBEAT, "");
final var ringInstance = new RingInstance(null, 1, 1);
var ringMessage = new Message(MessageType.HEARTBEAT, "");
ringInstance.onMessage(ringMessage);
Class ringInstanceClass = AbstractInstance.class;
Field messageQueueField = ringInstanceClass.getDeclaredField("messageQueue");
var ringInstanceClass = AbstractInstance.class;
var messageQueueField = ringInstanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
assertEquals(ringMessage, ((Queue<Message>) messageQueueField.get(ringInstance)).poll());
} catch (IllegalAccessException | NoSuchFieldException e) {
@ -56,9 +56,9 @@ public class RingInstanceTest {
@Test
public void testIsAlive() {
try {
final RingInstance ringInstance = new RingInstance(null, 1, 1);
Class ringInstanceClass = AbstractInstance.class;
Field aliveField = ringInstanceClass.getDeclaredField("alive");
final var ringInstance = new RingInstance(null, 1, 1);
var ringInstanceClass = AbstractInstance.class;
var aliveField = ringInstanceClass.getDeclaredField("alive");
aliveField.setAccessible(true);
aliveField.set(ringInstance, false);
assertFalse(ringInstance.isAlive());
@ -69,7 +69,7 @@ public class RingInstanceTest {
@Test
public void testSetAlive() {
final RingInstance ringInstance = new RingInstance(null, 1, 1);
final var ringInstance = new RingInstance(null, 1, 1);
ringInstance.setAlive(false);
assertFalse(ringInstance.isAlive());
}

56
leader-election/src/test/java/com/iluwatar/leaderelection/ring/RingMessageManagerTest.java
View File

@ -39,27 +39,27 @@ public class RingMessageManagerTest {
@Test
public void testSendHeartbeatMessage() {
Instance instance1 = new RingInstance(null, 1, 1);
var instance1 = new RingInstance(null, 1, 1);
Map<Integer, Instance> instanceMap = Map.of(1, instance1);
MessageManager messageManager = new RingMessageManager(instanceMap);
var messageManager = new RingMessageManager(instanceMap);
assertTrue(messageManager.sendHeartbeatMessage(1));
}
@Test
public void testSendElectionMessage() {
try {
Instance instance1 = new RingInstance(null, 1, 1);
Instance instance2 = new RingInstance(null, 1, 2);
Instance instance3 = new RingInstance(null, 1, 3);
var instance1 = new RingInstance(null, 1, 1);
var instance2 = new RingInstance(null, 1, 2);
var instance3 = new RingInstance(null, 1, 3);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3);
MessageManager messageManager = new RingMessageManager(instanceMap);
String messageContent = "2";
var messageManager = new RingMessageManager(instanceMap);
var messageContent = "2";
messageManager.sendElectionMessage(2, messageContent);
Message ringMessage = new Message(MessageType.ELECTION, messageContent);
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var ringMessage = new Message(MessageType.ELECTION, messageContent);
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
Message ringMessageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
var ringMessageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
assertEquals(ringMessageSent.getType(), ringMessage.getType());
assertEquals(ringMessageSent.getContent(), ringMessage.getContent());
} catch (NoSuchFieldException | IllegalAccessException e) {
@ -70,18 +70,18 @@ public class RingMessageManagerTest {
@Test
public void testSendLeaderMessage() {
try {
Instance instance1 = new RingInstance(null, 1, 1);
Instance instance2 = new RingInstance(null, 1, 2);
Instance instance3 = new RingInstance(null, 1, 3);
var instance1 = new RingInstance(null, 1, 1);
var instance2 = new RingInstance(null, 1, 2);
var instance3 = new RingInstance(null, 1, 3);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3);
MessageManager messageManager = new RingMessageManager(instanceMap);
String messageContent = "3";
var messageManager = new RingMessageManager(instanceMap);
var messageContent = "3";
messageManager.sendLeaderMessage(2, 3);
Message ringMessage = new Message(MessageType.LEADER, messageContent);
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var ringMessage = new Message(MessageType.LEADER, messageContent);
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
Message ringMessageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
var ringMessageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
assertEquals(ringMessageSent, ringMessage);
} catch (NoSuchFieldException | IllegalAccessException e) {
fail("Error to access private field.");
@ -91,17 +91,17 @@ public class RingMessageManagerTest {
@Test
public void testSendHeartbeatInvokeMessage() {
try {
Instance instance1 = new RingInstance(null, 1, 1);
Instance instance2 = new RingInstance(null, 1, 2);
Instance instance3 = new RingInstance(null, 1, 3);
var instance1 = new RingInstance(null, 1, 1);
var instance2 = new RingInstance(null, 1, 2);
var instance3 = new RingInstance(null, 1, 3);
Map<Integer, Instance> instanceMap = Map.of(1, instance1, 2, instance2, 3, instance3);
MessageManager messageManager = new RingMessageManager(instanceMap);
var messageManager = new RingMessageManager(instanceMap);
messageManager.sendHeartbeatInvokeMessage(2);
Message ringMessage = new Message(MessageType.HEARTBEAT_INVOKE, "");
Class instanceClass = AbstractInstance.class;
Field messageQueueField = instanceClass.getDeclaredField("messageQueue");
var ringMessage = new Message(MessageType.HEARTBEAT_INVOKE, "");
var instanceClass = AbstractInstance.class;
var messageQueueField = instanceClass.getDeclaredField("messageQueue");
messageQueueField.setAccessible(true);
Message ringMessageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
var ringMessageSent = ((Queue<Message>) messageQueueField.get(instance3)).poll();
assertEquals(ringMessageSent.getType(), ringMessage.getType());
assertEquals(ringMessageSent.getContent(), ringMessage.getContent());
} catch (NoSuchFieldException | IllegalAccessException e) {