Question

大家好我正在尝试使用java设置redis服务器。我的Redis服务器是linux服务器，ulimit无限制。

这是我的spring bean创建连接

公共类JedisService实现IJedisService，InitializingBean，DisposableBean { 私人JedisPool jedisPool;

public JedisService() {

}

public JedisPool getJedisPool() {
    return jedisPool;
}

@Override
public void destroy() throws Exception {
    if(jedisPool != null){
        jedisPool.destroy();
    }

}

@Override
public void afterPropertiesSet() throws Exception {
    JedisPoolConfig poolConfig = new JedisPoolConfig();
    poolConfig.setMaxActive(1000);
    poolConfig.setMaxIdle(10);
    poolConfig.setMinIdle(1);
    poolConfig.setMaxWait(30000);
    poolConfig.setNumTestsPerEvictionRun(10);
    poolConfig.setTestOnBorrow(true);
    poolConfig.setTestOnReturn(true);
    poolConfig.setTestWhileIdle(true);
    poolConfig.setTimeBetweenEvictionRunsMillis(30000);

    jedisPool = new JedisPool(poolConfig,Config.REDIS_HOST,
            RestrictionUtils.REDIS_PORT,RestrictionUtils.REDIS_CONNECTION_TIMEOUT);

}

public boolean validateHitsCount(String hostKey,String urlKey,int hostHitsCount, int urlHitsCount, long timeKey,Map<String, Object> overLimit){
    int retryCount = 0;
    return recursiveRedisConnection(retryCount,hostKey,urlKey,hostHitsCount,urlHitsCount,timeKey,overLimit);
}

private boolean recursiveRedisConnection(int retryCount,String hostKey,String urlKey,int hostHitsCount, int urlHitsCount, long timeKey,Map<String, Object> overLimit){
    Jedis jedis = null;
    boolean returnObj = true;
    try {
        //Connection
        jedis = getJedisPool().getResource();
        jedis.connect();

        //Delete previous keys
        try {
            deletePreviouskeys(jedis, urlKey, hostKey, timeKey);
        } catch (Exception e) {
        }

        //Validation
        String value = jedis.get(hostKey+timeKey);
        if(value != null){
            try {
                int count = Integer.parseInt(value);
                System.out.println("HostCount: "+hostKey+ "    "+count);
                if(count < hostHitsCount){
                    jedis.incr(hostKey+timeKey);
                    returnObj = validateURLHits(jedis, urlKey, urlHitsCount, timeKey, overLimit);
                }else{
                    returnObj = false;
                    overLimit.put("Data", "You have reached maximum limit for hits---"+hostKey);
                }
            } catch (Exception e) {
            }

        }else{
            value = 1+"";
            jedis.set(hostKey+timeKey, value);
            jedis.expire(hostKey+timeKey, 60);
            returnObj = validateURLHits(jedis, urlKey, urlHitsCount, timeKey, overLimit);
        }

    } catch (Exception e) {
        retryCount ++;
        if(retryCount < 3){
            recursiveRedisConnection(retryCount,hostKey,urlKey,hostHitsCount,urlHitsCount,timeKey,overLimit);
        }else{
            e.printStackTrace();
            returnObj = false;
        }
    }finally{
        if(jedis != null && jedis.isConnected()){
            getJedisPool().returnResource(jedis);
        }
    }
    return returnObj;
}

private boolean validateURLHits(Jedis jedis,String urlKey, int urlHitsCount, long timeKey,Map<String, Object> overLimit){
    boolean returnObj = true;
    String value = jedis.get(urlKey+timeKey);
    if(value != null){
        try {
            int count = Integer.parseInt(value);
            System.out.println("URLCount: "+urlKey+ "    "+count);
            if(count < urlHitsCount){
                jedis.incr(urlKey+timeKey);
            }else{
                returnObj = false;
                overLimit.put("Data", "Reached maximum limit of hits for this URL");
            }
        }catch(Exception e){
        }
    }else{
        jedis.set(urlKey+timeKey, 1+"");
        jedis.expire(urlKey+timeKey, 60);
    }
    return returnObj;
}

private void deletePreviouskeys(Jedis jedis,String urlKey, String hostKey, long timeKey){
    /*Set<String> keys = jedis.keys("*");
    for(String key :  keys){
        if(!key.equalsIgnoreCase(urlKey+timeKey)){
            if(!key.equalsIgnoreCase(hostKey+timeKey)){
                jedis.del(key);
            }
        }

    }*/
}

}

在控制器中调用validateURLHits方法。但是当我在多个线程中运行此代码时，我收到此错误

redis.clients.jedis.exceptions.JedisConnectionException：无法从池中获取资源 at redis.clients.util.Pool.getResource（Pool.java:22）在com.til.ibeat.service.JedisService.recursiveRedisConnection（JedisService.java:60）在com.til.ibeat.service.JedisService.recursiveRedisConnection（JedisService.java:95）在com.til.ibeat.service.JedisService.recursiveRedisConnection（JedisService.java:95）在com.til.ibeat.service.JedisService.validateHitsCount（JedisService.java:52）在com.til.ibeat.controller.MashupController.handleRequest（MashupController.java:66）在org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle（SimpleControllerHandlerAdapter.java:48）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:763）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:709）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:613）在org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:525）在javax.servlet.http.HttpServlet.service（HttpServlet.java:621）在javax.servlet.http.HttpServlet.service（HttpServlet.java:728）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:222）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:123）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472） at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:171）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:99）在org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:936）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407）在org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1004） at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:589） at org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:310） at java.util.concurrent.ThreadPoolExecutor $ Worker.runTask（Unknown Source） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（Unknown Source）在java.lang.Thread.run（未知来源）引起：java.util.NoSuchElementException：无法创建经过验证的对象，原因：ValidateObject失败

Answer 1

您是否检查过您的JedisPool只是一次而不是更多？

由于您的Spring bean是通过许多线程访问的，并且Jedis不是线程安全的，因此您可能有多个JedisPool返回奇怪的Jedis实例，或者同时由不同线程使用的jedis实例。每个线程都可以拥有此JedisPool和/或Jedis实例的本地副本，然后从中获取错误。

您有两个选择：您可以将JedisPool声明为静态final（每个类加载器只有一个值）或使用双重检查锁定（使用volatile）以确保所有线程只访问一个没有本地副本的JedisPool，一个线程使用的每个Jedis都不会被另一个线程访问。

无法从池JedisConnectionException获取资源

1 个答案: