🎨 #2663 优化重复消息检查器多实例导致多守护线程的问题，修改成单例+定时任务线程池处理

weixin-java-common/src/main/java/me/chanjar/weixin/common/api/WxMessageInMemoryDuplicateChecker.java

@@ -8,10 +8,12 @@ import java.util.concurrent.atomic.AtomicBoolean;
  * <pre>
  * 默认消息重复检查器.
  * 将每个消息id保存在内存里，每隔5秒清理已经过期的消息id，每个消息id的过期时间是15秒
+ * 替换类WxMessageInMemoryDuplicateCheckerSingleton
  * </pre>
  *
  * @author Daniel Qian
  */
+@Deprecated
 public class WxMessageInMemoryDuplicateChecker implements WxMessageDuplicateChecker {
 
   /**

weixin-java-common/src/main/java/me/chanjar/weixin/common/api/WxMessageInMemoryDuplicateCheckerSingleton.java

@@ -0,0 +1,91 @@
+package me.chanjar.weixin.common.api;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author jiangby
+ * @version 1.0
+ * <p>
+ *   消息去重，记录消息ID首次出现时的时间戳，
+ *   15S后定时任务触发时废除该记录消息ID
+ * </p>
+ * @date 2022/5/26 1:32
+ */
+@Slf4j
+public class WxMessageInMemoryDuplicateCheckerSingleton implements WxMessageDuplicateChecker {
+
+  /**
+   * 一个消息ID在内存的过期时间：15秒.
+   */
+  private static final Long TIME_TO_LIVE = 15L;
+
+  /**
+   * 每隔多少周期检查消息ID是否过期：5秒.
+   */
+  private static final Long CLEAR_PERIOD = 5L;
+
+  /**
+   * 线程池
+   */
+  private static final ScheduledThreadPoolExecutor SCHEDULED_THREAD_POOL_EXECUTOR = new ScheduledThreadPoolExecutor(1,
+    new ThreadFactoryBuilder().setNameFormat("wxMessage-memory-pool-%d").build(), new ThreadPoolExecutor.AbortPolicy());
+
+  /**
+   * 消息id->消息时间戳的map.
+   */
+  private static final ConcurrentHashMap<String, Long> MSG_ID_2_TIMESTAMP = new ConcurrentHashMap<>();
+
+  static {
+    SCHEDULED_THREAD_POOL_EXECUTOR.scheduleAtFixedRate(() -> {
+      try {
+        Long now = System.currentTimeMillis();
+        MSG_ID_2_TIMESTAMP.entrySet().removeIf(entry -> now - entry.getValue() > TIME_TO_LIVE * 1000);
+      } catch (Exception ex) {
+        log.error("重复消息去重任务出现异常", ex);
+      }
+    }, 1, CLEAR_PERIOD, TimeUnit.SECONDS);
+  }
+
+  /**
+   * 私有化构造方法，避免外部调用
+   */
+  private WxMessageInMemoryDuplicateCheckerSingleton() {
+  }
+
+  /**
+   * 获取单例
+   *
+   * @return 单例对象
+   */
+  public static WxMessageInMemoryDuplicateCheckerSingleton getInstance() {
+    return WxMessageInnerClass.CHECKER_SINGLETON;
+  }
+
+  /**
+   * 内部类实现单例
+   */
+  private static class WxMessageInnerClass {
+     static final WxMessageInMemoryDuplicateCheckerSingleton CHECKER_SINGLETON = new WxMessageInMemoryDuplicateCheckerSingleton();
+  }
+
+  /**
+   * messageId是否重复
+   *
+   * @param messageId messageId
+   * @return 是否
+   */
+  @Override
+  public boolean isDuplicate(String messageId) {
+    if (messageId == null) {
+      return false;
+    }
+    Long timestamp = MSG_ID_2_TIMESTAMP.putIfAbsent(messageId, System.currentTimeMillis());
+    return timestamp != null;
+  }
+}

weixin-java-common/src/test/java/me/chanjar/weixin/common/api/WxMessageInMemoryDuplicateCheckerSingletonTest.java

@@ -0,0 +1,45 @@
+package me.chanjar.weixin.common.api;
+
+import org.testng.annotations.Test;
+
+import java.util.concurrent.TimeUnit;
+
+import static org.testng.Assert.assertFalse;
+import static org.testng.Assert.assertTrue;
+
+/**
+ * @author jiangby
+ * @version 1.0
+ * @description: 作用
+ * @date 2022/5/26 1:46
+ */
+@Test
+public class WxMessageInMemoryDuplicateCheckerSingletonTest {
+
+  private static WxMessageInMemoryDuplicateCheckerSingleton checkerSingleton = WxMessageInMemoryDuplicateCheckerSingleton.getInstance();
+
+  public void test() throws InterruptedException {
+    Long[] msgIds = new Long[]{1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L};
+
+    // 第一次检查
+    for (Long msgId : msgIds) {
+      boolean result = checkerSingleton.isDuplicate(String.valueOf(msgId));
+      assertFalse(result);
+    }
+
+    // 初始化后1S进行检查 每五秒检查一次，过期时间为15秒，过15秒再检查
+    TimeUnit.SECONDS.sleep(15);
+    for (Long msgId : msgIds) {
+      boolean result = checkerSingleton.isDuplicate(String.valueOf(msgId));
+      assertTrue(result);
+    }
+
+    // 过6秒再检查
+    TimeUnit.SECONDS.sleep(6);
+    for (Long msgId : msgIds) {
+      boolean result = checkerSingleton.isDuplicate(String.valueOf(msgId));
+      assertFalse(result);
+    }
+
+  }
+}