jedis 实现阻塞队列 java代码
时间: 2023-11-26 18:56:55 浏览: 36
Sure, I can help you with that. Here's the Java code for implementing a blocking queue using Jedis:
```java
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.exceptions.JedisDataException;
public class JedisBlockingQueue<T> {
private final JedisPool jedisPool;
private final String queueName;
private final int timeout;
public JedisBlockingQueue(JedisPool jedisPool, String queueName, int timeout) {
this.jedisPool = jedisPool;
this.queueName = queueName;
this.timeout = timeout;
}
public void enqueue(T item) {
try (Jedis jedis = jedisPool.getResource()) {
jedis.rpush(queueName, item.toString());
}
}
public T dequeue() throws InterruptedException {
try (Jedis jedis = jedisPool.getResource()) {
while (true) {
// Perform a BLPOP operation with the configured timeout
// This operation will block until an item is available in the queue
// or until the timeout is reached
java.util.List<String> result = jedis.blpop(timeout, queueName);
// Check if the result is null, which means the operation timed out
if (result == null) {
continue;
}
// Extract the item from the result
String item = result.get(1);
// Handle the case where the item is null or invalid
if (item == null) {
continue;
}
// Successfully extracted the item from the queue, return it
return (T) item;
}
} catch (JedisDataException e) {
// The BLPOP operation will throw a JedisDataException if the connection is closed
// This can happen if another client closes the connection, or if the Redis server
// shuts down
Thread.sleep(1000);
return null;
}
}
}
```
Note that this implementation assumes that the items being stored in the queue are strings (hence the use of `item.toString()` when enqueuing), but you can modify it to handle other types if needed. Also, the `timeout` parameter specifies the maximum amount of time (in seconds) to block when waiting for an item to become available in the queue. Hope this helps!