public void TestCancelBlockingLock()
{
var cts = new CancellationTokenSource();
var resource = $"testredislock-{Guid.NewGuid()}";
using (var redisLockFactory = new RedisLockFactory(AllActiveEndPoints))
{
using (var firstLock = redisLockFactory.Create(
resource,
TimeSpan.FromSeconds(30),
TimeSpan.FromSeconds(10),
TimeSpan.FromSeconds(1)))
{
Assert.That(firstLock.IsAcquired);
cts.CancelAfter(TimeSpan.FromSeconds(2));
Assert.Throws <OperationCanceledException>(() =>
{
using (var secondLock = redisLockFactory.Create(
resource,
TimeSpan.FromSeconds(30),
TimeSpan.FromSeconds(10),
TimeSpan.FromSeconds(1),
cts.Token))
{
// should never get here
Assert.Fail();
}
});
}
}
}
public void TimeLock()
{
using (var redisLockFactory = new RedisLockFactory(AllActiveEndPoints))
{
var resource = $"testredislock-{Guid.NewGuid()}";
for (var i = 0; i < 10; i++)
{
var sw = Stopwatch.StartNew();
using (var redisLock = redisLockFactory.Create(resource, TimeSpan.FromSeconds(30)))
{
sw.Stop();
Logger.Info($"Acquire {i} took {sw.ElapsedTicks} ticks, success {redisLock.IsAcquired}");
sw.Restart();
}
sw.Stop();
Logger.Info($"Release {i} took {sw.ElapsedTicks} ticks, success");
}
}
}
public void TestSequentialLocks()
{
using (var redisLockFactory = new RedisLockFactory(AllActiveEndPoints))
{
var resource = $"testredislock-{Guid.NewGuid()}";
using (var firstLock = redisLockFactory.Create(resource, TimeSpan.FromSeconds(30)))
{
Assert.That(firstLock.IsAcquired, Is.True);
}
using (var secondLock = redisLockFactory.Create(resource, TimeSpan.FromSeconds(30)))
{
Assert.That(secondLock.IsAcquired, Is.True);
}
}
}
public void TestRaceForQuorum()
{
var locksAcquired = 0;
var lockKey = $"testredislock-{ThreadSafeRandom.Next(10000)}";
var tasks = new List <Task>();
for (var i = 0; i < 3; i++)
{
var task = new Task(() =>
{
Logger.Debug("Starting task");
using (var redisLockFactory = new RedisLockFactory(AllActiveEndPoints))
{
var sw = Stopwatch.StartNew();
using (var redisLock = redisLockFactory.Create(lockKey, TimeSpan.FromSeconds(30)))
{
sw.Stop();
Logger.Debug($"Lock method took {sw.ElapsedMilliseconds}ms to return, IsAcquired = {redisLock.IsAcquired}");
if (redisLock.IsAcquired)
{
Logger.Debug($"Got lock with id {redisLock.LockId}, sleeping for a bit");
Interlocked.Increment(ref locksAcquired);
// Sleep for long enough for the other threads to give up
//Thread.Sleep(TimeSpan.FromSeconds(2));
Task.Delay(TimeSpan.FromSeconds(2)).Wait();
Logger.Debug($"Lock with id {redisLock.LockId} done sleeping");
}
else
{
Logger.Debug("Couldn't get lock, giving up");
}
}
}
}, TaskCreationOptions.LongRunning);
tasks.Add(task);
}
foreach (var task in tasks)
{
task.Start();
}
Task.WaitAll(tasks.ToArray());
Assert.That(locksAcquired, Is.EqualTo(1));
}
private static void CheckSingleRedisLock(IEnumerable <RedisLockEndPoint> endPoints, bool expectedToAcquire)
{
using (var redisLockFactory = new RedisLockFactory(endPoints))
{
var resource = $"testredislock-{Guid.NewGuid()}";
using (var redisLock = redisLockFactory.Create(resource, TimeSpan.FromSeconds(30)))
{
Assert.That(redisLock.IsAcquired, Is.EqualTo(expectedToAcquire));
}
}
}
public void TestLockReleasedAfterTimeout()
{
using (var lockFactory = new RedisLockFactory(AllActiveEndPoints))
{
var resource = $"testrenewinglock-{Guid.NewGuid()}";
using (var firstLock = lockFactory.Create(resource, TimeSpan.FromSeconds(1)))
{
Assert.That(firstLock.IsAcquired, Is.True);
Thread.Sleep(550); // should cause keep alive timer to fire once
((RedisLock)firstLock).StopKeepAliveTimer(); // stop the keep alive timer to simulate process crash
Thread.Sleep(1200); // wait until the key expires from redis
using (var secondLock = lockFactory.Create(resource, TimeSpan.FromSeconds(1)))
{
Assert.That(secondLock.IsAcquired, Is.True); // Eventually the outer lock should timeout
}
}
}
}
public bool PerformActionWithLock(string resource, TimeSpan expirationTime, Action action)
{
using (var redisLock = _redisLockFactory.Create(resource, expirationTime))
{
//确认取得分布式锁
if (!redisLock.IsAcquired)
{
return(false);
}
action();
return(true);
}
}
public bool Execute(string key, Action action, double expirySec = 2)
{
RedisLockFactory redLockFactory = GetLockFactory();
using (var redisLock = redLockFactory.Create(key, TimeSpan.FromSeconds(expirySec)))
{
if (redisLock.IsAcquired)
{
action();
return(true);
}
}
return(false);
}
/// <summary>
/// Perform some action with Redis distributed lock
/// </summary>
/// <param name="resource">The thing we are locking on</param>
/// <param name="expirationTime">The time after which the lock will automatically be expired by Redis</param>
/// <param name="action">Action to be performed with locking</param>
/// <returns>True if lock was acquired and action was performed; otherwise false</returns>
public bool PerformActionWithLock(string resource, TimeSpan expirationTime, Action action)
{
//use RedLock library
using (var redisLock = _redisLockFactory.Create(resource, expirationTime))
{
//ensure that lock is acquired
if (!redisLock.IsAcquired)
{
return(false);
}
//perform action
action();
return(true);
}
}
/// <summary>
/// 跳过式调用，如果事情正在被调用，直接跳过
/// </summary>
/// <param name="resource">锁定资源的标识</param>
/// <param name="expiryTime">锁过期时间</param>
/// <param name="work"></param>
public bool OverlappingWork(string resource, TimeSpan expiryTime, Action work)
{
resource = this.CreateKey(resource);
using (var redisLockFactory = new RedisLockFactory(redisLockEndPoints))
{
using (var redisLock = redisLockFactory.Create(resource, expiryTime))
{
if (redisLock.IsAcquired)
{
work.Invoke();
return(true);
}
}
return(false);
}
}
public void TestBlockingConcurrentLocks()
{
var locksAcquired = 0;
using (var redisLockFactory = new RedisLockFactory(AllActiveEndPoints))
{
var resource = $"testblockingconcurrentlocks-{Guid.NewGuid()}";
var threads = new List <Thread>();
for (var i = 0; i < 2; i++)
{
var thread = new Thread(() =>
{
// ReSharper disable once AccessToDisposedClosure (we join on threads before disposing)
using (var redisLock = redisLockFactory.Create(
resource,
TimeSpan.FromSeconds(2),
TimeSpan.FromSeconds(10),
TimeSpan.FromSeconds(0.5)))
{
Logger.Info("Entering lock");
if (redisLock.IsAcquired)
{
Interlocked.Increment(ref locksAcquired);
}
Thread.Sleep(4000);
Logger.Info("Leaving lock");
}
});
thread.Start();
threads.Add(thread);
}
foreach (var thread in threads)
{
thread.Join();
}
}
Assert.That(locksAcquired, Is.EqualTo(2));
}
public void TestRenewing()
{
using (var redisLockFactory = new RedisLockFactory(AllActiveEndPoints))
{
var resource = $"testrenewinglock-{Guid.NewGuid()}";
int extendCount;
using (var redisLock = redisLockFactory.Create(resource, TimeSpan.FromSeconds(2)))
{
Assert.That(redisLock.IsAcquired, Is.True);
Thread.Sleep(4000);
extendCount = redisLock.ExtendCount;
}
Assert.That(extendCount, Is.GreaterThan(2));
}
}