Thread Learning

一个基于 Spring Boot 的线程池学习项目，演示如何配置和使用自定义线程池。

技术栈

• Spring Boot 3.2.0
• Java 17
• Maven
• Lombok

功能特性

• 🎯 自定义线程池配置
• 🔄 异步任务执行
• 📊 多种线程池类型（通用、IO密集型）
• ⚙️ 可配置的线程池参数
• 📝 详细的执行日志
• 🧠 Java内存模型（JMM）演示
• 🔒 可见性、原子性、有序性测试
• 🔄 volatile、synchronized、原子类对比
• 🏤 生产者消费者模式（wait/notify、Lock、BlockingQueue）
• 📊 ConcurrentHashMap vs HashMap 并发安全性对比
• 🔧 同步工具类应用场景（CountDownLatch、CyclicBarrier、Semaphore）
• 🚀 CompletableFuture异步编程（组合、异常处理、超时）
• 💾 ThreadLocal使用与内存泄漏防范
• 🔐 锁升级过程演示（偏向锁→轻量级锁→重量级锁）
• 📊 自定义拒绝策略和线程池监控

快速开始

启动应用

mvn spring-boot:run

测试接口

应用启动后，可以通过以下API测试功能：

线程池功能测试

• 默认异步任务: GET http://localhost:8081/thread-pool/test-default
• 自定义线程池: GET http://localhost:8081/thread-pool/test-custom
• IO线程池: GET http://localhost:8081/thread-pool/test-io
• 多任务测试: GET http://localhost:8081/thread-pool/test-multiple

Java内存模型（JMM）演示

• 普通变量可见性: GET http://localhost:8081/jmm/normal-visibility
• volatile可见性: GET http://localhost:8081/jmm/volatile-visibility
• synchronized保证: GET http://localhost:8081/jmm/synchronized-visibility
• 原子类保证: GET http://localhost:8081/jmm/atomic-visibility
• 指令重排序: GET http://localhost:8081/jmm/reordering
• 所有JMM演示: GET http://localhost:8081/jmm/all

生产者消费者模式演示

• wait/notify模式: GET http://localhost:8081/producer-consumer/wait-notify
• Lock/Condition模式: GET http://localhost:8081/producer-consumer/lock-condition
• ArrayBlockingQueue: GET http://localhost:8081/producer-consumer/array-blocking-queue
• LinkedBlockingQueue: GET http://localhost:8081/producer-consumer/linked-blocking-queue
• SynchronousQueue: GET http://localhost:8081/producer-consumer/synchronous-queue
• 多生产者消费者: GET http://localhost:8081/producer-consumer/multiple
• 所有模式演示: GET http://localhost:8081/producer-consumer/all

并发集合安全性对比

• HashMap线程不安全: GET http://localhost:8081/concurrent-map/hashmap-unsafe
• ConcurrentHashMap安全: GET http://localhost:8081/concurrent-map/concurrenthashmap-safe
• 并发修改异常: GET http://localhost:8081/concurrent-map/concurrent-modification-exception
• 性能对比测试: GET http://localhost:8081/concurrent-map/performance-comparison
• 原子操作演示: GET http://localhost:8081/concurrent-map/atomic-operations
• 所有对比演示: GET http://localhost:8081/concurrent-map/all

同步工具类应用场景

• CountDownLatch: GET http://localhost:8081/sync-tools/countdown-latch
• CyclicBarrier: GET http://localhost:8081/sync-tools/cyclic-barrier
• Semaphore连接池: GET http://localhost:8081/sync-tools/semaphore-pool
• Semaphore限流: GET http://localhost:8081/sync-tools/semaphore-ratelimit
• 组合使用: GET http://localhost:8081/sync-tools/combined-usage
• 所有工具演示: GET http://localhost:8081/sync-tools/all

CompletableFuture异步编程

• 基础使用: GET http://localhost:8081/completable-future/basic-usage
• 链式操作: GET http://localhost:8081/completable-future/chaining
• 组合操作: GET http://localhost:8081/completable-future/combining
• 异常处理: GET http://localhost:8081/completable-future/exception-handling
• 超时处理: GET http://localhost:8081/completable-future/timeout
• 并行处理: GET http://localhost:8081/completable-future/parallel-processing
• 竞速模式: GET http://localhost:8081/completable-future/any-of
• 所有演示: GET http://localhost:8081/completable-future/all

ThreadLocal使用与防泄漏

• 基础使用: GET http://localhost:8081/thread-local/basic-usage
• 线程池中使用: GET http://localhost:8081/thread-local/thread-pool-usage
• 内存泄漏演示: GET http://localhost:8081/thread-local/memory-leak
• 可继承版本: GET http://localhost:8081/thread-local/inheritable
• DateFormat安全: GET http://localhost:8081/thread-local/dateformat-safety
• 性能对比: GET http://localhost:8081/thread-local/performance-comparison
• 所有演示: GET http://localhost:8081/thread-local/all

高级并发特性

• 锁升级过程: GET http://localhost:8081/advanced/lock-upgrade
• 锁性能对比: GET http://localhost:8081/advanced/lock-performance
• 读写锁优势: GET http://localhost:8081/advanced/read-write-lock
• 可重入锁: GET http://localhost:8081/advanced/reentrant-lock
• 自定义拒绝策略: GET http://localhost:8081/advanced/custom-rejection
• 线程池监控: GET http://localhost:8081/advanced/thread-pool-monitoring
• 所有高级演示: GET http://localhost:8081/advanced/all

项目结构

src/main/java/com/example/threadlearning/
├── config/
│   └── ThreadPoolConfig.java      # 线程池配置
├── controller/
│   ├── ThreadPoolController.java  # 线程池REST API接口
│   ├── JmmController.java         # JMM演示API接口
│   ├── ProducerConsumerController.java # 生产者消费者API接口
│   ├── ConcurrentMapController.java    # 并发集合API接口
│   ├── SyncToolsController.java   # 同步工具API接口
│   ├── CompletableFutureController.java # 异步编程API接口
│   ├── ThreadLocalController.java # ThreadLocalAPI接口
│   └── AdvancedConcurrencyController.java # 高级并发API接口
├── service/
│   └── AsyncService.java          # 异步服务
├── jmm/
│   └── MemoryVisibilityDemo.java  # JMM内存可见性演示
├── pattern/
│   ├── WaitNotifyProducerConsumer.java # wait/notify生产者消费者
│   └── BlockingQueueProducerConsumer.java # 阻塞队列生产者消费者
├── concurrent/
│   └── ConcurrentMapDemo.java     # 并发集合对比演示
├── sync/
│   └── SynchronizationToolsDemo.java # 同步工具类演示
├── async/
│   └── CompletableFutureDemo.java # CompletableFuture演示
├── threadlocal/
│   └── ThreadLocalDemo.java       # ThreadLocal演示
├── lock/
│   └── LockUpgradeDemo.java       # 锁升级演示
├── monitor/
│   └── ThreadPoolMonitorDemo.java # 线程池监控演示
└── ThreadLearningApplication.java # 启动类

配置说明

所有线程池参数均可在 application.properties 中配置：

• thread.pool.custom.* - 自定义线程池配置
• thread.pool.io.* - IO线程池配置
• thread.pool.default.* - 默认线程池配置

日志查看

应用运行时会输出详细的线程执行日志，可以观察不同线程池的工作情况。