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邮箱创建时间打标与自动删除功能设计思路

news 2025/8/25 5:53:09

邮箱创建时间打标与自动删除功能设计思路

🎯 问题背景

在邮件处理系统中，收件人邮箱数量会随时间无限增长，导致内存泄漏和性能下降。需要设计一个自动管理机制来解决这个问题。

🏗️ 设计方案

核心数据结构

// 邮箱创建时间映射表
private final Map<String, Long> emailCreationTimestamps = new ConcurrentHashMap<>();// 收件人邮箱映射表  
private final Map<String, List<EmailMessage>> recipientEmailMap = new ConcurrentHashMap<>();// 保留时间配置
private static final long EMAIL_RETENTION_TIME = 24 * 60 * 60 * 1000; // 1天

设计思路

创建时间打标：新邮箱首次出现时记录时间戳
自动清理：每次处理邮件后检查过期邮箱
批量删除：一次性删除所有过期邮箱
异步处理：服务器删除操作异步执行

🔧 核心实现

1. 邮箱创建时间打标

private void processEmailGrouping(List<EmailMessage> newEmails) {long currentTime = System.currentTimeMillis();recipientEmailGroupMap.forEach((recipientEmail, emails) -> {// 检查是否是新邮箱if (!recipientEmailMap.containsKey(recipientEmail)) {// 记录新邮箱的创建时间emailCreationTimestamps.put(recipientEmail, currentTime);log.debug("新邮箱 {} 创建时间: {}", recipientEmail, new Date(currentTime));}recipientEmailMap.computeIfAbsent(recipientEmail, k -> new ArrayList<>()).addAll(emails);});
}

2. 自动删除过期邮箱

private void cleanupExpiredEmails() {long currentTime = System.currentTimeMillis();Set<String> expiredEmails = findExpiredEmails(currentTime);if (!expiredEmails.isEmpty()) {performEmailCleanup(expiredEmails);}
}private Set<String> findExpiredEmails(long currentTime) {return emailCreationTimestamps.entrySet().stream().filter(entry -> (currentTime - entry.getValue()) > EMAIL_RETENTION_TIME).map(Map.Entry::getKey).collect(Collectors.toSet());
}

3. 邮箱删除机制

public boolean deleteRecipientEmail(String recipientEmail) {try {List<EmailMessage> emailsToDelete = recipientEmailMap.get(recipientEmail);if (ObjectUtils.isNotEmpty(emailsToDelete)) {// 删除邮件ID// 取出idSet<String> messageIds = emailsToDelete.stream().map(EmailMessage::getMessageId).collect(Collectors.toSet());processedMessageIds.removeAll(messageIds);// 删除内存中的邮箱recipientEmailMap.remove(recipientEmail);// 删除创建时间emailCreationTimestamps.remove(recipientEmail);// 异步删除服务器邮件deleteEmailsFromServerAsync(recipientEmail);}return true;} catch (Exception e) {log.error("删除邮箱 {} 时发生错误", recipientEmail, e);return false;}
}

📊 监控统计

public Map<String, Object> getProcessingStats() {Map<String, Object> stats = new ConcurrentHashMap<>();int totalEmailCount = recipientEmailMap.values().stream().mapToInt(List::size).sum();stats.put("processedMessageCount", processedMessageIds.size());stats.put("recipientEmailCount", recipientEmailMap.size());stats.put("totalEmailCount", totalEmailCount);stats.put("emailCreationTimestampCount", emailCreationTimestamps.size());return stats;
}

🚀 工作流程设计

1. 新邮箱创建流程

2. 自动清理流程

3. 邮箱删除详细流程

4. 整体系统工作流程

5. 数据流转关系图

📝 使用示例

// 获取统计信息
Map<String, Object> stats = defaultEmailMonitorService.getProcessingStats();
System.out.println("邮箱数量: " + stats.get("recipientEmailCount"));// 获取所有邮箱
List<String> allEmails = defaultEmailMonitorService.getAllRecipientEmails();// 删除指定邮箱
boolean success = defaultEmailMonitorService.deleteRecipientEmail("user@example.com");