Java基于内存的消息队列实现
2024-09-08 16:15:21
Java基于内存的消息队列实现
有需要源码的同学可以去Gitee上下载：
https://gitee.com/hyxl-520/memory_message_queue
先看测试情况
需求背景
需求来源于我写的一个单体应用方便使用的动态任务调度框架（详细内容见Gitee地址：https://gitee.com/hyxl-520/autojob.git），该框架需要实现对运行的任务的日志记录。我采用的方案是Log4j2的自定义Appender和Filter，但是如何有序、高效的采集Appender获得的日志是一个问题，因此我拟采用基于内存的消息队列。本博客只讨论消息队列实现方式，不讨论动态任务调度框架的使用方式。
实现的功能
- 支持可阻塞的消息生产和消费。
- 支持TTL（即消息可设置过期时长）。
- 支持单播和多播。
拟采用的数据结构
根据需求和功能，拟采用Java的LinkedBlockingQueue，具体原因如下：
LinkedBlockingQueue具有可阻塞、线程安全的优点。LinkedBlockingQueue具有链式结构，由于要实现TTL，即会经常的删除消息队列中的已过期消息，相比ArrayBlockingQueue，链式结构删除复杂度更低
完整数据结构如下：
Map<String, MessageQueue<MessageEntry<M>>> messageQueues;
public static class MessageQueue<M> {
private final BlockingQueue<M> messageQueue;
public MessageQueue() {
messageQueue = new LinkedBlockingQueue<>();
}
public MessageQueue(int maxLength) {
if (maxLength <= 0) {
throw new IllegalArgumentException("最大容量应该为非负数");
}
messageQueue = new LinkedBlockingDeque<>(maxLength);
}
public M takeMessageSync() throws InterruptedException {
return messageQueue.take();
}
public M takeMessage() {
return messageQueue.poll();
}
public M readMessage() {
return messageQueue.peek();
}
public M tryReadMessage() {
return messageQueue.element();
}
public boolean removeIf(Predicate<? super M> predicate) {
if (predicate == null) {
return false;
}
return messageQueue.removeIf(predicate);
}
public int length() {
return messageQueue.size();
}
public boolean remove(M message) {
if (message == null) {
return false;
}
return messageQueue.remove(message);
}
public Iterator<M> iterator() {
return messageQueue.iterator();
}
private boolean publishMessageSync(M message) throws InterruptedException {
if (message == null) {
return false;
}
try {
messageQueue.put(message);
return true;
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
private boolean publishMessage(M message) {
if (message == null) {
return false;
}
try {
return messageQueue.offer(message);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
public static class MessageEntry<M> {
long messageId;
M message;
long expiringTime;
public MessageEntry(long messageId, M message, long expiringTime) {
this.messageId = messageId;
this.message = message;
this.expiringTime = expiringTime;
}
public MessageEntry() {
}
}
Map采用HashTable，确保线程安全。其中MessageQueue封装了LinkedBlockingQueue，作为容器的内部类，其中生产者方法为私有，保证容器可以访问其生产者方法，但是消费者在外部订阅后只能访问消费者的方法。
MessageEntry是消息条目的封装，除了消息内容，还包含消息ID以及过期时间。
模块设计
IMessageQueueContext：IMessageQueueContext是消息容器，所有的消息都将放在这个类里面，其实现了IProducer和ICounsumer接口，即提供了生产者和消费者的所有功能。并且通过创建守护线程实现了TTL功能。过期监听策略分为两种（ExpirationListenerPolicy）：
- 单线程遍历所有topic的所有消息
- 每个topic并发遍历
前者适合主题少、总消息数少的情况，后者适合主题较多、消息总数较多的情况。
使用工厂模式，主要配置属性有：
/**
* 默认过期时间：ms，对所有消息设置，-1则表示消息均为永久性消息，除非消费者取出，否则将会一直存在。谨慎使用！
*/
private long defaultExpiringTime = -1;
/**
* 是否允许设置单个消息的过期时间
*/
private boolean isAllowSetEntryExpired = false;
/**
* 允许的最大主题数
*/
private int allowMaxTopicCount = 255;
/**
* 允许每个队列的最大消息数
*/
private int allowMaxMessageCountPerQueue;
/**
* 过期监听器的策略
*/
private ExpirationListenerPolicy listenerPolicy;
通过修改属性值可以构建出单播和多播的生产者消费者。
一个消息容器可供多个生产者和消费者使用。
提供topic过期功能，当消费者订阅后会统计一个订阅数目，当消费者取消订阅时如果当前topic的订阅数和消息堆积数为0，若指定时间内没有生产者生产消息将会移除该主题。
MessageProducer：MessageProducer为生产者，实现了IProducer接口（其实最终实现来自于IMessageQueueContext类），其提供如图上的方法。构建时需要指定所使用的消息容器。
MessageConsumer：MessageConsumer为消费者，实现了IConsumer接口（其实最终实现来自于IMessageQueueContext类）。对于消息消费强烈建议不要使用如下参数列表String topic的方法，这个方法将不能使用消息容器提供的topic过期功能，建议先订阅指定队列，再从该队列获取消息，生产者对于队列订阅也提供了阻塞功能。
拓展
消息容器的队列可采用多种实现，如采用DelayQueue可以实现死信队列。
完整源代码
IMessageQueueContext
package com.example.autojob.skeleton.mq;
/**
* @Description
* @Auther Huang Yongxiang
* @Date 2022/03/20 9:57
*/
public interface IMessageQueueContext<M> {
int length(String topic);
/**
* 使得消息立即过期
*
* @param topic 主题
* @return void
* @throws ErrorExpiredException 过期时发生异常抛出
* @author Huang Yongxiang
* @date 2022/3/20 11:31
*/
void expire(String topic, MessageQueueContext.MessageEntry<M> messageEntry) throws ErrorExpiredException;
/**
* 摧毁消息容器并启动垃圾清理
*
* @return void
* @author Huang Yongxiang
* @date 2022/3/22 14:33
*/
void destroy();
}
IConsumer
package com.example.autojob.skeleton.mq;
import java.util.concurrent.TimeUnit;
/**
* @Description
* @Auther Huang Yongxiang
* @Date 2022/03/21 14:20
*/
public interface IConsumer<M> {
/**
* 阻塞的获取一条消息，可以决定是否将该消息取出，即移出队列
*
* @param topic 主题
* @param isTakeout 是否移出队列，当为false时该方法将退化成非阻塞的
* @return M
* @author Huang Yongxiang
* @date 2022/3/20 10:55
*/
M takeMessageBlock(final String topic, final boolean isTakeout);
M takeMessageNoBlock(final String topic, final boolean isTakeout);
MessageQueueContext.MessageQueue<MessageQueueContext.MessageEntry<M>> subscriptionMessage(String topic);
/**
* 阻塞的尝试订阅指定消息队列，如果存在则立即返回，否则将会等待指定时长，若期间创建则会立即返回，否则等
* 到结束返回null
*
* @param topic 主题
* @param wait 要阻塞获取的时长
* @param unit wait的时间单位
* @return com.example.autojob.skeleton.mq.MessageQueueContext.MessageQueue<com.example.autojob.skeleton.mq.MessageQueueContext.MessageEntry < M>>
* @author Huang Yongxiang
* @date 2022/3/22 14:32
*/
MessageQueueContext.MessageQueue<MessageQueueContext.MessageEntry<M>> subscriptionMessage(String topic, long wait, TimeUnit unit);
void unsubscribe(String topic);
void unsubscribe(String topic,long wait,TimeUnit unit);
}
IProducer
package com.example.autojob.skeleton.mq;
import java.util.concurrent.TimeUnit;
/**
* @Description
* @Auther Huang Yongxiang
* @Date 2022/03/21 14:19
*/
public interface IProducer<M> {
/**
* 注册一个消息队列
*
* @param topic 主题名
* @return boolean
* @author Huang Yongxiang
* @date 2022/3/20 9:59
*/
boolean registerMessageQueue(String topic);
boolean hasTopic(String topic);
boolean removeMessageQueue(String topic);
/**
* 非阻塞的发布一条消息，当容量已满时立即返回
*
* @param message 消息内容
* @param topic 队列主题
* @return boolean
* @author Huang Yongxiang
* @date 2022/3/20 9:59
*/
boolean publishMessageNoBlock(final M message, final String topic);
/**
* 非阻塞的发布一条消息，同时指定其过期时间，当容量已满时立即返回
*
* @param message 消息内容
* @param topic 主题
* @param expiringTime 过期时长
* @param unit 时间单位
* @return boolean
* @author Huang Yongxiang
* @date 2022/3/20 10:09
*/
boolean publishMessageNoBlock(final M message, final String topic, final long expiringTime, final TimeUnit unit);
/**
* 阻塞的发布一条消息，当容量已满时等待空出
*
* @param message 消息内容
* @param topic 队列主题
* @return boolean
* @author Huang Yongxiang
* @date 2022/3/20 10:03
*/
boolean publishMessageBlock(final M message, final String topic);
boolean publishMessageBlock(final M message, final String topic, final long expiringTime, final TimeUnit unit);
}
ErrorExpiredException
package com.example.autojob.skeleton.mq;
/**
* @Description 消息过期异常类
* @Auther Huang Yongxiang
* @Date 2022/03/20 11:32
*/
public class ErrorExpiredException extends RuntimeException{
public ErrorExpiredException() {
super();
}
public ErrorExpiredException(String message) {
super(message);
}
public ErrorExpiredException(String message, Throwable cause) {
super(message, cause);
}
public ErrorExpiredException(Throwable cause) {
super(cause);
}
protected ErrorExpiredException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
}
}
ExpirationListenerPolicy
package com.example.autojob.skeleton.mq;
/**
* @Description 过期策略
* @Auther Huang Yongxiang
* @Date 2022/03/21 9:30
*/
public enum ExpirationListenerPolicy {
/**
* 单线程监听过期
*/
SINGLE_THREAD,
/**
* 按照主题并发监听过期，总消息数目过多时采取该方式可以使得效率更高，注意topic过多会占用大量线程资源
*/
TOPIC_CONCURRENCY
}
MessageConsumer
package com.example.autojob.skeleton.mq;
import java.util.concurrent.TimeUnit;
/**
* @Description 消费者
* @Auther Huang Yongxiang
* @Date 2022/03/21 12:53
*/
public class MessageConsumer<M> implements IConsumer<M> {
private final MessageQueueContext<M> messageQueueContext;
public MessageConsumer(MessageQueueContext<M> messageQueueContext) {
this.messageQueueContext = messageQueueContext;
}
@Override
public M takeMessageBlock(String topic, boolean isTakeout) {
if (messageQueueContext == null) {
throw new NullPointerException("消息容器为空");
}
return messageQueueContext.takeMessageBlock(topic, isTakeout);
}
@Override
public M takeMessageNoBlock(String topic, boolean isTakeout) {
if (messageQueueContext == null) {
throw new NullPointerException("消息容器为空");
}
return messageQueueContext.takeMessageNoBlock(topic, isTakeout);
}
@Override
public MessageQueueContext.MessageQueue<MessageQueueContext.MessageEntry<M>> subscriptionMessage(String topic) {
return messageQueueContext.subscriptionMessage(topic);
}
@Override
public MessageQueueContext.MessageQueue<MessageQueueContext.MessageEntry<M>> subscriptionMessage(String topic, long wait, TimeUnit unit) {
return messageQueueContext.subscriptionMessage(topic, wait, unit);
}
@Override
public void unsubscribe(String topic) {
messageQueueContext.unsubscribe(topic);
}
@Override
public void unsubscribe(String topic, long wait, TimeUnit unit) {
messageQueueContext.unsubscribe(topic, wait, unit);
}
}
MessageProducer
package com.example.autojob.skeleton.mq;
import lombok.Data;
import java.util.concurrent.TimeUnit;
/**
* @Description 生产者
* @Auther Huang Yongxiang
* @Date 2022/03/21 12:54
*/
@Data
public class MessageProducer<M> implements IProducer<M> {
private MessageQueueContext<M> queueContext;
private static final int maxMessageCount = 1000;
private static final long expiringTime = -1;
public MessageProducer(final MessageQueueContext<M> messageQueueContext) {
this.queueContext = messageQueueContext;
}
public MessageProducer() {
queueContextBuild();
}
public MessageQueueContext<M> getMessageQueueContext() {
if (queueContext == null) {
queueContextBuild();
}
return queueContext;
}
private void queueContextBuild() {
queueContext = MessageQueueContext.builder().setAllowMaxMessageCountPerQueue(maxMessageCount).setDefaultExpiringTime(expiringTime).setAllowMaxTopicCount(1).setListenerPolicy(ExpirationListenerPolicy.SINGLE_THREAD).setAllowSetEntryExpired(true).build();
}
@Override
public boolean registerMessageQueue(String topic) {
return queueContext.registerMessageQueue(topic);
}
@Override
public boolean hasTopic(String topic) {
return queueContext.hasTopic(topic);
}
@Override
public boolean removeMessageQueue(String topic) {
return queueContext.removeMessageQueue(topic);
}
@Override
public boolean publishMessageNoBlock(M message, String topic) {
return queueContext.publishMessageNoBlock(message, topic);
}
@Override
public boolean publishMessageNoBlock(M message, String topic, long expiringTime, TimeUnit unit) {
return queueContext.publishMessageNoBlock(message, topic, expiringTime, unit);
}
@Override
public boolean publishMessageBlock(M message, String topic) {
return queueContext.publishMessageBlock(message, topic);
}
@Override
public boolean publishMessageBlock(M message, String topic, long expiringTime, TimeUnit unit) {
return queueContext.publishMessageBlock(message, topic, expiringTime, unit);
}
}
MessageQueueContext
package com.example.autojob.skeleton.mq;
import com.example.autojob.util.convert.StringUtils;
import com.example.autojob.util.id.IdGenerator;
import com.example.autojob.util.id.SystemClock;
import com.example.autojob.util.thread.ScheduleTaskUtil;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.Setter;
import lombok.experimental.Accessors;
import lombok.extern.slf4j.Slf4j;
import javax.annotation.PostConstruct;
import javax.swing.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.Predicate;
/**
* @Description 内存消息队列的context
* @Auther Huang Yongxiang
* @Date 2022/03/18 17:14
*/
@Slf4j
public class MessageQueueContext<M> implements IMessageQueueContext<M>, IProducer<M>, IConsumer<M> {
/**
* 默认过期时间：ms，对所有消息设置，-1则表示消息均为永久性消息，除非消费者取出，否则将会一直存在。谨慎使用！
*/
private long defaultExpiringTime = -1;
/**
* 是否允许设置单个消息的过期时间
*/
private boolean isAllowSetEntryExpired = false;
/**
* 允许的最大主题数
*/
private int allowMaxTopicCount = 255;
/**
* 允许每个队列的最大消息数
*/
private int allowMaxMessageCountPerQueue;
/**
* 过期监听器的策略
*/
private ExpirationListenerPolicy listenerPolicy;
//存储消息的数据结构
private Map<String, MessageQueue<MessageEntry<M>>> messageQueues;
private boolean isOpenListener = false;
/**
* 守护线程
*/
private ScheduledExecutorService executorService;
/**
* 各个主题的订阅数
*/
private Map<String, AtomicLong> subscriptionCount;
public static Builder<Object> builder() {
return new Builder<>();
}
private MessageQueueContext() {
}
@PostConstruct
public void init() {
}
@Override
public boolean registerMessageQueue(String topic) {
if (StringUtils.isEmpty(topic)) {
log.error("创建队列失败，主题为空");
return false;
}
if (messageQueues.containsKey(topic)) {
return false;
}
if (messageQueues.size() >= allowMaxTopicCount) {
log.error("当前消息容器最大支持{}个主题", allowMaxTopicCount);
return false;
}
try {
MessageQueue<MessageEntry<M>> messageQueue = new MessageQueue<>(allowMaxMessageCountPerQueue);
messageQueues.put(topic, messageQueue);
if (!isOpenListener) {
if (listenerPolicy == ExpirationListenerPolicy.SINGLE_THREAD) {
scheduleExpiringCheckSingleThread();
} else {
scheduleExpiringCheckTopicConcurrency();
}
isOpenListener = true;
}
if (subscriptionCount == null) {
subscriptionCount = new Hashtable<>();
}
subscriptionCount.put(topic, new AtomicLong(0));
return true;
} catch (Exception e) {
log.error("创建队列发生异常：{}", e.getMessage());
}
return false;
}
@Override
public boolean hasTopic(String topic) {
return messageQueues.containsKey(topic);
}
@Override
public boolean removeMessageQueue(String topic) {
try {
messageQueues.remove(topic);
System.gc();
return true;
} catch (Exception e) {
log.error("移除消息队列时发生异常：{}", e.getMessage());
}
return false;
}
@Override
public boolean publishMessageNoBlock(M message, String topic, long expiringTime, TimeUnit unit) {
if (!isAllowSetEntryExpired) {
log.error("不允许设置单个消息的过期时间");
return false;
}
if (!messageQueues.containsKey(topic)) {
log.error("发布非阻塞消息失败，所要发布到的队列：{}不存在", topic);
return false;
}
if (expiringTime <= 0 || unit == null) {
log.error("非法过期时间");
return false;
}
if (message == null) {
log.error("禁止发布空消息");
return false;
}
MessageEntry<M> messageEntry = new MessageEntry<>();
messageEntry.setMessageId(IdGenerator.getNextIdAsLong());
messageEntry.setMessage(message);
messageEntry.setExpiringTime(unit.toMillis(expiringTime) + SystemClock.now());
return messageQueues.get(topic).publishMessage(messageEntry);
}
@Override
public boolean publishMessageBlock(M message, String topic, long expiringTime, TimeUnit unit) {
if (!isAllowSetEntryExpired) {
log.error("不允许设置单个消息的过期时间");
return false;
}
if (!messageQueues.containsKey(topic)) {
log.error("发布非阻塞消息失败，所要发布到的队列：{}不存在", topic);
return false;
}
if (expiringTime <= 0 || unit == null) {
log.error("非法过期时间");
return false;
}
if (message == null) {
log.error("禁止发布空消息");
return false;
}
MessageEntry<M> messageEntry = new MessageEntry<>();
messageEntry.setMessageId(IdGenerator.getNextIdAsLong());
messageEntry.setMessage(message);
messageEntry.setExpiringTime(unit.toMillis(expiringTime) + SystemClock.now());
try {
return messageQueues.get(topic).publishMessageSync(messageEntry);
} catch (InterruptedException e) {
log.warn("发布可阻塞消息发生异常，等待时被异常占用：{}", e.getMessage());
}
return false;
}
/**
* 阻塞的获取一条消息，可以决定是否将该消息取出，即移出队列，当多播时最好不要移出队列
*
* @param topic 主题
* @param isTakeout 是否移出队列，当为false时该方法将退化成非阻塞的
* @return M
* @author Huang Yongxiang
* @date 2022/3/20 10:55
*/
@Override
public M takeMessageBlock(String topic, boolean isTakeout) {
if (!messageQueues.containsKey(topic)) {
return null;
}
if (isTakeout) {
try {
return messageQueues.get(topic).takeMessageSync().message;
} catch (InterruptedException e) {
log.warn("可阻塞获取消息发生异常，等待时被异常占用：{}", e.getMessage());
}
return null;
}
return messageQueues.get(topic).readMessage().message;
}
@Override
public M takeMessageNoBlock(String topic, boolean isTakeout) {
if (!messageQueues.containsKey(topic)) {
return null;
}
if (isTakeout) {
return messageQueues.get(topic).takeMessage().message;
}
return messageQueues.get(topic).readMessage().message;
}
@Override
public MessageQueue<MessageEntry<M>> subscriptionMessage(String topic) {
MessageQueue<MessageEntry<M>> messageQueue = messageQueues.get(topic);
if (messageQueue != null && subscriptionCount != null) {
AtomicLong atomicLong = subscriptionCount.get(topic);
atomicLong.incrementAndGet();
}
return messageQueue;
}
@Override
@SuppressWarnings("unchecked")
public MessageQueue<MessageEntry<M>> subscriptionMessage(String topic, long wait, TimeUnit unit) {
MessageQueue<MessageEntry<M>> messageQueue = subscriptionMessage(topic);
if (messageQueue != null) {
return messageQueue;
}
//进行阻塞获取
ScheduledFuture<Object> future = ScheduleTaskUtil.build(false, "subscriptionBlock").EOneTimeTask(() -> {
long blockTime = unit.toMillis(wait);
int i = 0;
try {
do {
if (hasTopic(topic)) {
return messageQueues.get(topic);
}
Thread.sleep(1);
} while (i++ <= blockTime);
return null;
} catch (Exception e) {
log.error("阻塞订阅时发生异常：{}", e.getMessage());
}
return null;
}, 1, TimeUnit.MILLISECONDS);
try {
return (MessageQueue<MessageEntry<M>>) future.get();
} catch (InterruptedException | ExecutionException e) {
log.error("阻塞订阅时发生异常：{}", e.getMessage());
}
return null;
}
@Override
public void unsubscribe(String topic) {
unsubscribe(topic, 5, TimeUnit.SECONDS);
}
@Override
public void unsubscribe(String topic, long wait, TimeUnit unit) {
if (subscriptionCount != null) {
AtomicLong atomicLong = subscriptionCount.get(topic);
atomicLong.decrementAndGet();
if (atomicLong.get() < 0) {
atomicLong.set(0);
}
//当有队列取消订阅，且目前消息数为0，则对指定队列监视5秒，5秒后依然没有生产者发布消息则直接移除主题
if (atomicLong.get() == 0 && length(topic) == 0) {
long w = unit.toMillis(wait);
log.debug("主题为{}的消息队列目前订阅数为0且积压消息为0，当{}ms后若无生产者发布消息将自动删除该主题队列", topic, w);
ScheduleTaskUtil.build(true, "temporaryProducerListener").EOneTimeTask(() -> {
int i = 0;
boolean flag = true;
do {
if (length(topic) > 0) {
flag = false;
break;
}
Thread.sleep(1);
} while (i++ <= w);
if (flag) {
log.debug("主题：{}自动删除完成", topic);
removeMessageQueue(topic);
}
return flag;
}, 1, TimeUnit.MILLISECONDS);
}
}
}
@Override
public int length(String topic) {
if (messageQueues.containsKey(topic)) {
return messageQueues.get(topic).length();
}
return 0;
}
@Override
public void expire(String topic, MessageQueueContext.MessageEntry<M> messageEntry) throws ErrorExpiredException {
if (messageEntry == null || !messageQueues.containsKey(topic)) {
throw new IllegalArgumentException("参数有误，ID非法或主题不存在");
}
try {
boolean flag = messageQueues.get(topic).remove(messageEntry);
if (!flag) {
throw new ErrorExpiredException("移出失败");
}
} catch (Exception e) {
log.error("过期时发生异常");
throw new ErrorExpiredException(e.getMessage());
}
}
@Override
public void destroy() {
messageQueues = null;
if (isOpenListener) {
try {
executorService.shutdown();
isOpenListener = false;
} catch (Exception e) {
log.error("关闭守护线程发生异常：{}", e.getMessage());
}
}
System.gc();
}
/**
* <p>根据迭代器位置来使得一个元素过期，由于迭代器的弱一致性，多线程环境下可能会出现使用迭代器时
* 发生插入\删除操作，由于该消息队列对于操作严格从队尾执行，因此对于插入修改能检测到，但是由于
* 删除从队首进行，可能发生当迭代器获取下一个元素时为空，这时应该立即停止遍历，等待下一次</p>
*
* @param iterator 迭代器
* @return void
* @author Huang Yongxiang
* @date 2022/3/21 11:42
*/
public void expire(Iterator<MessageEntry<M>> iterator) throws ErrorExpiredException {
if (iterator == null) {
throw new ErrorExpiredException("过期失败，迭代器为空");
}
try {
iterator.remove();
} catch (UnsupportedOperationException e) {
throw new ErrorExpiredException("过期失败，该迭代器不支持移除操作");
} catch (IllegalStateException e) {
throw new ErrorExpiredException("过期失败，可能发生删除操作");
}
}
@Override
public boolean publishMessageNoBlock(M message, String topic) {
if (!messageQueues.containsKey(topic)) {
log.error("发布非阻塞消息失败，所要发布到的队列主题：{}不存在", topic);
return false;
}
if (message == null) {
log.error("禁止发布空消息");
return false;
}
MessageEntry<M> messageEntry = new MessageEntry<>();
messageEntry.setMessageId(IdGenerator.getNextIdAsLong());
messageEntry.setMessage(message);
messageEntry.setExpiringTime(defaultExpiringTime > 0 ? defaultExpiringTime + SystemClock.now() : -1);
return messageQueues.get(topic).publishMessage(messageEntry);
}
public boolean publishMessageBlock(M message, String topic) {
if (!messageQueues.containsKey(topic)) {
log.error("发布阻塞消息失败，所要发布到的队列主题：{}不存在", topic);
return false;
}
if (message == null) {
log.error("禁止发布空消息");
return false;
}
try {
MessageEntry<M> messageEntry = new MessageEntry<>();
messageEntry.setMessageId(IdGenerator.getNextIdAsLong());
messageEntry.setMessage(message);
messageEntry.setExpiringTime(defaultExpiringTime > 0 ? defaultExpiringTime + SystemClock.now() : -1);
return messageQueues.get(topic).publishMessageSync(messageEntry);
} catch (InterruptedException e) {
log.warn("发布可阻塞消息发生异常，等待时被异常占用：{}", e.getMessage());
}
return false;
}
private void scheduleExpiringCheckSingleThread() {
executorService = Executors.newSingleThreadScheduledExecutor(runnable -> {
Thread thread = new Thread(runnable, "ExpiringCheckSingleThread");
thread.setDaemon(true);
return thread;
});
executorService.scheduleAtFixedRate(() -> {
for (Map.Entry<String, MessageQueue<MessageEntry<M>>> entry : messageQueues.entrySet()) {
for (Iterator<MessageEntry<M>> it = entry.getValue().iterator(); it.hasNext(); ) {
MessageEntry<M> message = it.next();
//如果达到过期时间则通知其过期
if (message.expiringTime >= 0 && message.expiringTime <= SystemClock.now()) {
try {
//log.info("messageId：{}已过期", message.messageId);
expire(it);
} catch (ErrorExpiredException e) {
log.error("主题：{}，消息ID：{}过期失败：{}", entry.getKey(), message.getMessageId(), e.getMessage());
}
}
}
}
}, 1, 1, TimeUnit.MILLISECONDS);
}
private void scheduleExpiringCheckTopicConcurrency() {
executorService = Executors.newSingleThreadScheduledExecutor(runnable -> {
Thread thread = new Thread(runnable, "ExpiringCheckTopicConcurrencyThread");
thread.setDaemon(true);
return thread;
});
executorService.scheduleAtFixedRate(() -> {
for (Map.Entry<String, MessageQueue<MessageEntry<M>>> entry : messageQueues.entrySet()) {
ScheduledExecutorService queueScheduler = Executors.newSingleThreadScheduledExecutor(runnable -> {
Thread thread = new Thread(runnable, String.format("%sQueueListener", entry.getKey()));
thread.setDaemon(true);
return thread;
});
synchronized (MessageEntry.class) {
queueScheduler.schedule(() -> {
for (Iterator<MessageEntry<M>> it = entry.getValue().iterator(); it.hasNext(); ) {
MessageEntry<M> message = it.next();
//如果达到过期时间则通知其过期
if (message.expiringTime >= 0 && message.expiringTime <= SystemClock.now()) {
try {
log.info("messageId：{}已过期", message.messageId);
expire(it);
} catch (ErrorExpiredException e) {
log.error("主题：{}，消息ID：{}过期失败：{}", entry.getKey(), message.getMessageId(), e.getMessage());
}
}
}
}, 1, TimeUnit.MILLISECONDS);
}
}
}, 1000, 1000, TimeUnit.MILLISECONDS);
}
@Setter
@Accessors(chain = true)
public static class Builder<M> {
/**
* 默认过期时间，对所有消息设置，-1则表示消息均为永久性消息，除非消费者取出，否则将会一直存在。谨慎使用！
*/
private long defaultExpiringTime = -1;
/**
* 是否允许设置单个消息的过期时间
*/
private boolean isAllowSetEntryExpired = false;
/**
* 允许的最大主题数
*/
private int allowMaxTopicCount = 255;
/**
* 允许每个队列的最大消息数
*/
private int allowMaxMessageCountPerQueue = 1000;
/**
* 过期监听器的策略
*/
private ExpirationListenerPolicy listenerPolicy = ExpirationListenerPolicy.SINGLE_THREAD;
public Builder<M> setDefaultExpiringTime(long defaultExpiringTime, TimeUnit unit) {
if (unit == TimeUnit.MICROSECONDS) {
log.error("最小支持毫秒级");
throw new IllegalArgumentException("最小支持毫秒级");
}
this.defaultExpiringTime = unit.toMillis(defaultExpiringTime);
return this;
}
public <M1 extends M> MessageQueueContext<M1> build() {
MessageQueueContext<M1> messageQueueContext = new MessageQueueContext<>();
messageQueueContext.messageQueues = new Hashtable<>(this.allowMaxTopicCount);
messageQueueContext.isAllowSetEntryExpired = this.isAllowSetEntryExpired;
messageQueueContext.allowMaxMessageCountPerQueue = this.allowMaxMessageCountPerQueue;
messageQueueContext.defaultExpiringTime = this.defaultExpiringTime;
messageQueueContext.allowMaxTopicCount = this.allowMaxTopicCount;
messageQueueContext.listenerPolicy = this.listenerPolicy;
return messageQueueContext;
}
}
public static class MessageQueue<M> {
private final BlockingQueue<M> messageQueue;
public MessageQueue() {
messageQueue = new LinkedBlockingQueue<>();
}
public MessageQueue(int maxLength) {
if (maxLength <= 0) {
throw new IllegalArgumentException("最大容量应该为非负数");
}
messageQueue = new LinkedBlockingDeque<>(maxLength);
}
public M takeMessageSync() throws InterruptedException {
return messageQueue.take();
}
public M takeMessage() {
return messageQueue.poll();
}
public M readMessage() {
return messageQueue.peek();
}
public M tryReadMessage() {
return messageQueue.element();
}
public boolean removeIf(Predicate<? super M> predicate) {
if (predicate == null) {
return false;
}
return messageQueue.removeIf(predicate);
}
public int length() {
return messageQueue.size();
}
public boolean remove(M message) {
if (message == null) {
return false;
}
return messageQueue.remove(message);
}
public Iterator<M> iterator() {
return messageQueue.iterator();
}
private boolean publishMessageSync(M message) throws InterruptedException {
if (message == null) {
return false;
}
try {
messageQueue.put(message);
return true;
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
private boolean publishMessage(M message) {
if (message == null) {
return false;
}
try {
return messageQueue.offer(message);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
@Getter
@Setter(AccessLevel.PRIVATE)
public static class MessageEntry<M> {
long messageId;
M message;
long expiringTime;
public MessageEntry(long messageId, M message, long expiringTime) {
this.messageId = messageId;
this.message = message;
this.expiringTime = expiringTime;
}
public MessageEntry() {
}
}
public static void main(String[] args) {
int producerCount = 50;
int consumerCount = 50;
long maxMessageCount = 10000000;
AtomicLong getMessageAccount = new AtomicLong(0);
AtomicBoolean isFinished = new AtomicBoolean(false);
int perProducerCreate = (int) (maxMessageCount / producerCount);
MessageQueueContext<String> messageQueueContext = MessageQueueContext.builder().setAllowMaxTopicCount(producerCount).setListenerPolicy(ExpirationListenerPolicy.TOPIC_CONCURRENCY).setDefaultExpiringTime(30, TimeUnit.SECONDS).setAllowSetEntryExpired(true).build();
for (int i = 0; i < producerCount; i++) {
messageQueueContext.registerMessageQueue(i + "");
}
Runnable create = () -> {
MessageProducer<String> producer = new MessageProducer<>(messageQueueContext);
String topicName = Thread.currentThread().getName();
for (int i = 0; i < perProducerCreate; i++) {
producer.publishMessageBlock(StringUtils.getRandomStr(10), topicName);
}
};
Runnable get = () -> {
MessageConsumer<String> consumer = new MessageConsumer<>(messageQueueContext);
String topicName = Thread.currentThread().getName();
while (true) {
if (getMessageAccount.get() % 10000 == 0) {
log.info("已消费消息：{}条", getMessageAccount.get());
}
consumer.takeMessageBlock(topicName, true);
getMessageAccount.incrementAndGet();
if (getMessageAccount.get() == maxMessageCount) {
isFinished.set(true);
break;
}
}
};
long start = System.currentTimeMillis();
for (int i = 0; i < producerCount; i++) {
Thread thread = new Thread(create);
thread.setName("" + i);
thread.start();
}
for (int i = 0; i < consumerCount; i++) {
Thread thread = new Thread(get);
thread.setName("" + i);
thread.start();
}
Thread thread = new Thread(() -> {
while (true) {
if (isFinished.get()) {
break;
}
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
long end = System.currentTimeMillis();
log.info("测试完成！消费者数目：{}，生产者数目：{}，消息总数：{}，总计耗时：{}s", consumerCount, producerCount, maxMessageCount, (end - start) / 1000);
});
thread.start();
}
}
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