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BSD-2-Clause

redlock-cpp

C++实现redis分布式锁 redlock-cpp - Redis distributed locks in C++

Based on Redlock-rb by Salvatore Sanfilippo

This library implements the Redis-based distributed lock manager algorithm described in this blog post.

To create a lock manager:

CRedLock * dlm = new CRedLock();
dlm->AddServerUrl("127.0.0.1", 5005);
dlm->AddServerUrl("127.0.0.1", 5006);
dlm->AddServerUrl("127.0.0.1", 5007);

To acquire a lock:

CLock my_lock;
bool flag = dlm->Lock("my_resource_name", 1000, my_lock);

or(will alway hold the lock until release it):

CLock my_lock;
bool flag = dlm->ContinueLock("my_resource_name", 1000, my_lock);

Where the resource name is an unique identifier of what you are trying to lock and 1000 is the number of milliseconds for the validity time.

The returned value is false if the lock was not acquired (you may try again), otherwise an class representing the lock is returned, having three keys:

class CLock {
public:
    int m_validityTime; => 9897.3020019531 // 当前锁可以存活的时间, 毫秒
    sds m_resource; => my_resource_name // 要锁住的资源名称
    sds m_val; => 53771bfa1e775 // 锁住资源的进程随机名字
};

validity, an integer representing the number of milliseconds the lock will be valid. resource, the name of the locked resource as specified by the user. token, a random token value which is used to safe reclaim the lock. To release a lock:

dlm->Unlock(my_lock);

It is possible to setup the number of retries (by default 3) and the retry delay (by default 200 milliseconds) used to acquire the lock.

The retry delay is actually chosen at random between $retryDelay / 2 milliseconds and the specified $retryDelay value.

Disclaimer: As stated in the original antirez's version, this code implements an algorithm which is currently a proposal, it was not formally analyzed. Make sure to understand how it works before using it in your production environments.

Copyright (c) 2014, jacketzhong All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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redis锁 展开 收起
BSD-2-Clause
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