feat: 新增可计数的拒绝策略.

src/main/java/com/serliunx/statemanagement/support/DefaultCountableRejectedExecutionHandler.java

@@ -0,0 +1,40 @@
+package com.serliunx.statemanagement.support;
+
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * 附带计数的拒绝策略默认实现(丢弃任务并计数)
+ *
+ * @author <a href="mailto:serliunx@yeah.net">SerLiunx</a>
+ * @version 1.0.0
+ * @since 2025/3/5
+ */
+public class DefaultCountableRejectedExecutionHandler implements CountableRejectedExecutionHandler {
+
+    /**
+     * 计数器
+     */
+    private final AtomicLong counter = new AtomicLong(0);
+
+    /**
+     * 最后一次被拒绝的任务
+     */
+    private volatile Runnable last = null;
+
+    @Override
+    public long getCount() {
+        return counter.get();
+    }
+
+    @Override
+    public Runnable getLastRejectedTask() {
+        return last;
+    }
+
+    @Override
+    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
+        last = r;
+        counter.incrementAndGet();
+    }
+}