redisson支持高并发的RBucket

起名不费劲2023-11-19 10:21

作用：RBucket桶可存储任意对象，可在高并发场景下进行唯一更新。

示例：创建20个线程并发更新桶对象，只有一个执行了更新操作。

先添加redisson的依赖。

XML 复制代码

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.20.0</version>
</dependency>

java 复制代码

public static void main(String[] args) {
    Config config = new Config();
    config.useSingleServer()
            .setAddress("redis://localhost:6379")
            .setPassword("123456");
    RedissonClient client = Redisson.create(config);
    RCountDownLatch countDownLatch = client.getCountDownLatch("countDownLatch");
    countDownLatch.trySetCount(20);
    RBucket<String> bucket = client.getBucket("bucket");
    bucket.set("桶测试"+1);
    String oldValue=bucket.get();
    ExecutorService executorService= Executors.newFixedThreadPool(20);
    for (int i=0;i<20;i++){
        executorService.submit(() -> {
            System.out.println("线程:" + Thread.currentThread().getId() + ",桶:" + bucket.get());
            if (bucket.compareAndSet(oldValue, "桶测试 " + 2)) {
                System.out.println("线程" + Thread.currentThread().getId() + "更新了bucket的值");
            }
            countDownLatch.countDown();
        });
    }
    try {
        countDownLatch.await();
    }catch (Exception e){
        e.printStackTrace();
    }
    System.out.println("更新后的桶对象为："+bucket.get());
    executorService.shutdown();
}

接口文档：

java 复制代码

public interface RBucket<V> extends RExpirable, RBucketAsync<V> {
 
    void set(V var1);                                  //设置桶存储的对象
    void set(V var1, long var2, TimeUnit var4);        //设置桶存储的对象，设置操作的超时时间var2
 
    boolean trySet(V var1);                            //尝试设置桶的新值
    boolean trySet(V var1, long var2, TimeUnit var4);  //尝试设置桶的新值，设置超时时间var2
 
    boolean compareAndSet(V var1, V var2);             //原子替换桶的新值为var2
 
    long size();                                       //桶存储对象的大小
 
    V get();                                           //返回桶存储的对象
    V getAndDelete();                                  //返回并删除桶存储的对象
 
    V getAndSet(V var1);                               //返回桶的旧值，设置新值
    V getAndSet(V var1, long var2, TimeUnit var4);     //返回桶的旧值，设置新值，设置操作的超时时间var2
 
}