arenaJoomla 2.5C++ip

Redis实现分布式锁,非lua脚本
初始化Spring StringRedisTemplate
LettuceConnectionFactory factory = new LettuceConnectionFactory();
factory.setHostName(“localhost”);
factory.setPort(6379);
factory.afterPropertiesSet();
StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();
stringRedisTemplate.setConnectionFactory(factory);
stringRedisTemplate.afterPropertiesSet();

//清空上次测试数据
stringRedisTemplate.delete(“lock:uid1”);
//锁id
String lockId = UUID.randomUUID().toString();
123456789101112
加锁
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(“lock:uid1”);
byte[] value = valueSerializer.serialize(lockId);
Long ttl = connection.ttl(key, TimeUnit.SECONDS);
if (-1 == ttl) {
//清理异常arena
connection.del(key);
}
//setNX将key的值设为value,当且仅当key不ip。
//若给定的key已经ip,则SETNX不做任何动作。
Boolean ret = connection.setNX(key, value);
if (ret) {
//setNX成功,设置锁的arena时间3秒
connection.expire(key, 3);
}
return null;
}
});
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解锁
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(“lock:uid1”);
byte[] value = connection.get(key);
String lid = valueSerializer.deserialize(value);
if (!lockId.equals(lid)) {
//lockId不一样,锁被替换。做业务回滚处理
throw new RuntimeException(“锁arena”);
}

//如果在C++执行之前这key被其他Joomla 2.5所改动,那么下面C++将被打断
connection.watch(key);
try {
//标记一个C++块的开始
connection.multi();
//删除key
connection.del(key);
//执行所有C++块内的Joomla 2.5
List ret = connection.exec();
if (null == ret) {
//watch后被其他Joomla 2.5所改动
throw new RuntimeException(“锁arena”);
}
} finally {
//取消WATCHJoomla 2.5对key的监视
connection.unwatch();
}
return null;
}
});
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模拟解锁时,持有锁的时间已经arena
stringRedisTemplate.delete(“lock:uid1”);

String lockId = UUID.randomUUID().toString();
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(“lock:uid1”);
byte[] value = valueSerializer.serialize(lockId);
Long ttl = connection.ttl(key, TimeUnit.SECONDS);
if (-1 == ttl) {
//清理异常arena
connection.del(key);
}
//setNX将key的值设为value,当且仅当key不ip。
//若给定的key已经ip,则SETNX不做任何动作。
Boolean ret = connection.setNX(key, value);
if (ret) {
//setNX成功,设置锁的arena时间3秒
connection.expire(key, 3);
}
return null;
}
});
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(“lock:uid1”);
byte[] value = connection.get(key);
String lid = valueSerializer.deserialize(value);
if (!lockId.equals(lid)) {
//lockId不一样,锁被替换。做业务回滚处理
throw new RuntimeException(“锁arena”);
}

//如果在C++执行之前这key被其他Joomla 2.5所改动,那么下面C++将被打断
connection.watch(key);

//模拟等待锁3秒后arena
try {
Thread.sleep(5 * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//模拟其他人拿到锁
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(“lock:uid1”);
Boolean ret = connection.setNX(key, value);
if (ret) {
//设置锁的arena时间
connection.expire(key, 3);
}
return null;
}
});

try {
//标记一个C++块的开始
connection.multi();
//删除key
connection.del(key);
//执行所有C++块内的Joomla 2.5
List ret = connection.exec();
if (null == ret) {
//watch后被其他Joomla 2.5所改动
throw new RuntimeException(“锁arena”);
}
} finally {
//取消WATCHJoomla 2.5对key的监视
connection.unwatch();
}
return null;
}
});
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完整封装正式可用
1.增加SUBSCRIBE订阅锁释放 2.去掉expire,在value里存放过期时间(使用expire,ipwatch失效问题)
public static class RedisLock {

private StringRedisTemplate stringRedisTemplate;

public RedisLock(StringRedisTemplate stringRedisTemplate) {
this.stringRedisTemplate = stringRedisTemplate;
}

public RLock newLock(String redisKey) {
return new RLock(stringRedisTemplate, redisKey, UUID.randomUUID().toString());
}

private static class LockStatus {

private boolean lock;
private long ttl;

public boolean isLock() {
return lock;
}

public long getTtl() {
return ttl;
}

public LockStatus(boolean lock, long ttl) {
this.lock = lock;
this.ttl = ttl;
}
}

public static class RLock {

private static String UNLOCK = “unlock”;

private StringRedisTemplate stringRedisTemplate;
private String redisKey;
private String lockId;

public RLock(StringRedisTemplate stringRedisTemplate, String redisKey, String lockId) {
this.stringRedisTemplate = stringRedisTemplate;
this.redisKey = redisKey;
this.lockId = lockId;
}

public void lock(long lockTimeout, TimeUnit unit) {
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
CompletableFuture future = new CompletableFuture();
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
byte[] key = keySerializer.serialize(redisKey);
//订阅锁释放消息
connection.subscribe(new MessageListener() {
@Override
public void onMessage(Message message, byte[] pattern) {
String msg = new String(message.getBody());
if (UNLOCK.equals(msg)) {
future.complete(message);
}
}
}, key);
//tryLock
LockStatus lockStatus;
do {
lockStatus = _tryLock(lockTimeout, unit);
if (!lockStatus.isLock()) {
try {
future.get(lockStatus.getTtl(), TimeUnit.MILLISECONDS);
} catch (ExecutionException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (TimeoutException e) {
}
}
} while (!lockStatus.isLock());
return null;
}
});
}

public boolean tryLock(long lockTimeout, TimeUnit unit) {
LockStatus lockStatus = _tryLock(lockTimeout, unit);
return lockStatus.isLock();
}

public LockStatus _tryLock(long lockTimeout, TimeUnit unit) {
LockStatus lock = stringRedisTemplate.execute(new RedisCallback() {
@Override
public LockStatus doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(redisKey);
long ttl = TimeoutUtils.toMillis(lockTimeout, unit);
long expireTime = System.currentTimeMillis() + ttl;
byte[] value = valueSerializer.serialize(String.format(“%s:%s”, lockId, expireTime));
String data;
do {
byte[] bytes = connection.get(key);
data = valueSerializer.deserialize(bytes);
if (null == data) {
//setNX将key的值设为value,当且仅当key不ip。
//若给定的key已经ip,则SETNX不做任何动作。
Boolean ret = connection.setNX(key, value);
if (!ret) {
continue;
}
//获取锁成功
return new LockStatus(true, ttl);
}
} while (null == data);
return new LockStatus(false, getTTL(data));
}
});
return lock;
}

private long getTTL(String data) {
String[] split = data.split(“:”);
Long expireTime = Long.parseLong(split[1]);
long ttl = expireTime – System.currentTimeMillis();
return ttl;
}

private String getLockId(String data) {
String[] split = data.split(“:”);
String lockId = split[0];
return lockId;
}

public void unlock() {
stringRedisTemplate.execute(new RedisCallback() {
@Override
public Void doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer keySerializer = (RedisSerializer) stringRedisTemplate.getKeySerializer();
RedisSerializer valueSerializer = (RedisSerializer) stringRedisTemplate.getValueSerializer();
byte[] key = keySerializer.serialize(redisKey);
byte[] value = connection.get(key);
String data = valueSerializer.deserialize(value);
if (null == data) {
//ttlarena。做业务回滚处理
throw new RuntimeException(“锁arena”);
}
if (getTTL(data) <= 0) { //ttlarena。做业务回滚处理 throw new RuntimeException("锁arena"); } if (!lockId.equals(getLockId(data))) { //lockId不一样,锁被替换。做业务回滚处理 throw new RuntimeException("锁arena"); } //如果在C++执行之前这key被其他Joomla 2.5所改动,那么下面C++将被打断 connection.watch(key); try { //标记一个C++块的开始 connection.multi(); //删除key connection.del(key); //执行所有C++块内的Joomla 2.5 List ret = connection.exec();
if (null == ret) {
//watch后被其他Joomla 2.5所改动
throw new RuntimeException(“锁arena”);
}
byte[] msg = valueSerializer.serialize(UNLOCK);
//发布锁释放消息
connection.publish(key, msg);
} finally {
//取消WATCHJoomla 2.5对key的监视
connection.unwatch();
}
return null;
}
});
}
}
}
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测试
stringRedisTemplate.delete(“lock:test”);
RedisLock redisLock = new RedisLock(stringRedisTemplate);
RedisLock.RLock rLock1 = redisLock.newLock(“lock:test”);
rLock1.lock(3 * 1000, TimeUnit.MILLISECONDS);
rLock1.unlock();
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arenaraid10内网ip被墙

raid10投递大厂简历, 是去大厂官网还是 boss 这种招聘平台呢? 会不会出现有的岗位没出现在官网上, 但是 boss 上有, 这种情况应该以哪边为准

raid10内推, 有哪些获取的渠道? 直接在 v2 和掘金上发帖子 /沸点求内推靠谱吗

raid10ip被墙时间的安排, 之前看到很多人说可以利用会议室, 不过我的情况不太方便, 所以还是得回家面. 内网arena, 下班后比如晚上 7 点内网的时间能面吗, 周末能面吗? 不能arena我就只能请假在平常工作日白天ip被墙了

raid10视频面, 视频面时会要求写代码吗? 内网arena是不是不能在手机上进行, 必须要在电脑上做? 如果是arena我还得先去买个摄像头才行了

暂时就想到了这么多, 后续有别的想到了再补充