From e7be8acca8c05ca799131ed55292123254528b40 Mon Sep 17 00:00:00 2001
From: "chen.ma" <machencoding@163.com>
Date: Tue, 13 Sep 2022 21:01:48 +0800
Subject: [PATCH] Add built-in deny policy documentation

---
 .../dev_manual/blocking-queue-custom.md       |  2 +-
 .../dev_manual/rejected-policy-custom.md      |  2 +-
 .../dev_manual/rejected-policy-info.md        | 50 +++++++++++++++++++
 3 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 docs/docs/user_docs/dev_manual/rejected-policy-info.md

diff --git a/docs/docs/user_docs/dev_manual/blocking-queue-custom.md b/docs/docs/user_docs/dev_manual/blocking-queue-custom.md
index 3ab0d33c..67c8df6b 100644
--- a/docs/docs/user_docs/dev_manual/blocking-queue-custom.md
+++ b/docs/docs/user_docs/dev_manual/blocking-queue-custom.md
@@ -1,5 +1,5 @@
 ---
-sidebar_position: 1
+sidebar_position: 2
 ---
 
 # 阻塞队列自定义
diff --git a/docs/docs/user_docs/dev_manual/rejected-policy-custom.md b/docs/docs/user_docs/dev_manual/rejected-policy-custom.md
index 970511f5..53b1d78f 100644
--- a/docs/docs/user_docs/dev_manual/rejected-policy-custom.md
+++ b/docs/docs/user_docs/dev_manual/rejected-policy-custom.md
@@ -1,5 +1,5 @@
 ---
-sidebar_position: 0
+sidebar_position: 1
 ---
 
 # 拒绝策略自定义
diff --git a/docs/docs/user_docs/dev_manual/rejected-policy-info.md b/docs/docs/user_docs/dev_manual/rejected-policy-info.md
new file mode 100644
index 00000000..d5c68138
--- /dev/null
+++ b/docs/docs/user_docs/dev_manual/rejected-policy-info.md
@@ -0,0 +1,50 @@
+---
+sidebar_position: 0
+---
+
+# 内置拒绝策略
+
+内置两种拒绝策略说明：
+
+**RunsOldestTaskPolicy**：添加新任务并由主线程运行最早的任务。
+
+```java
+public class RunsOldestTaskPolicy implements RejectedExecutionHandler {
+
+    @Override
+    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
+        if (executor.isShutdown()) {
+            return;
+        }
+        BlockingQueue<Runnable> workQueue = executor.getQueue();
+        Runnable firstWork = workQueue.poll();
+        boolean newTaskAdd = workQueue.offer(r);
+        if (firstWork != null) {
+            firstWork.run();
+        }
+        if (!newTaskAdd) {
+            executor.execute(r);
+        }
+    }
+}
+```
+
+**SyncPutQueuePolicy**：主线程把拒绝任务以阻塞的方式添加到队列。
+
+```java
+@Slf4j
+public class SyncPutQueuePolicy implements RejectedExecutionHandler {
+
+    @Override
+    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
+        if (executor.isShutdown()) {
+            return;
+        }
+        try {
+            executor.getQueue().put(r);
+        } catch (InterruptedException e) {
+            log.error("Adding Queue task to thread pool failed.", e);
+        }
+    }
+}
+```
\ No newline at end of file