// This project demonstrates Redis as a Distributed Lock Manager combined with
// Aspect Oriented Programming to create a 'MethodMutex' aspect. When a method
// is decorated with this aspect, it effectively becomes single "threaded"
// across all running instances, even if they are in different processes or on
// different planets. Additionally, code calling the decorated method receives
// immediate feedback and can determine whether to retry, continue, or take
// any other course of action.
//
// To see it in action, build the project then find the executable in your
// output/bin folder and launch multiple instances. Be sure to update the
// app.config file with the connection info for your Redis server!
public static void Main()
{
WorkerInstance worker2 = new WorkerInstance();
while (true)
{
Console.WriteLine(worker2.DoWork());
System.Threading.Thread.Sleep(1000);
}
Process thisInstance = Process.GetCurrentProcess();
Process[] allInstances = Process.GetProcessesByName(thisInstance.ProcessName);
Thread.Sleep(200); // helps to randomize which instance gets the mutex first
while (allInstances.Length == 1)
{
Console.Clear();
Console.WriteLine("Redis Distributed Locking Example\r\n");
Console.WriteLine("Launch a 2nd instance of this app to start...");
Thread.Sleep(400);
allInstances = Process.GetProcessesByName(thisInstance.ProcessName);
}
Console.Clear();
Console.WriteLine("Redis Distributed Locking Example\r\n");
Console.WriteLine("Attempting to do work on PID {0}...\r\n", thisInstance.Id);
WorkerInstance worker = new WorkerInstance();
bool gotWorkDone = worker.DoWork();
if (!gotWorkDone)
{
Console.WriteLine("{0:T} - Method was locked, waiting...", DateTime.Now);
// whether to retry or continue depends on your specific scenario
// for demo, we'll retry. In cases where workers might receive
// duplicate payloads near-instantaneously and only one should
// succeed, you might just choose to continue.
Stopwatch time = Stopwatch.StartNew();
do
{
Thread.Sleep(500);
gotWorkDone = worker.DoWork();
Console.WriteLine("gotWorkDone: " + gotWorkDone);
} while (!gotWorkDone && time.Elapsed < TimeSpan.FromMinutes(1));
time.Stop();
if (!gotWorkDone)
{
Console.WriteLine("Timed out after 1 minute...");
}
}
Console.WriteLine("Press any key to quit, 'Q' to quit all...");
var ck = Console.ReadKey();
if (ck.KeyChar == 'Q')
{
allInstances = Process.GetProcessesByName(thisInstance.ProcessName);
foreach (var app in allInstances)
{
app.CloseMainWindow();
}
}
}
// This project demonstrates Redis as a Distributed Lock Manager combined with
// Aspect Oriented Programming to create a 'MethodMutex' aspect. When a method
// is decorated with this aspect, it effectively becomes single "threaded"
// across all running instances, even if they are in different processes or on
// different planets. Additionally, code calling the decorated method receives
// immediate feedback and can determine whether to retry, continue, or take
// any other course of action.
//
// To see it in action, build the project then find the executable in your
// output/bin folder and launch multiple instances. Be sure to update the
// app.config file with the connection info for your Redis server!
public static void Main()
{
WorkerInstance worker2 = new WorkerInstance();
while (true)
{
Console.WriteLine(worker2.DoWork());
System.Threading.Thread.Sleep(1000);
}
Process thisInstance = Process.GetCurrentProcess();
Process[] allInstances = Process.GetProcessesByName(thisInstance.ProcessName);
Thread.Sleep(200); // helps to randomize which instance gets the mutex first
while (allInstances.Length == 1)
{
Console.Clear();
Console.WriteLine("Redis Distributed Locking Example\r\n");
Console.WriteLine("Launch a 2nd instance of this app to start...");
Thread.Sleep(400);
allInstances = Process.GetProcessesByName(thisInstance.ProcessName);
}
Console.Clear();
Console.WriteLine("Redis Distributed Locking Example\r\n");
Console.WriteLine("Attempting to do work on PID {0}...\r\n", thisInstance.Id);
WorkerInstance worker = new WorkerInstance();
bool gotWorkDone = worker.DoWork();
if (!gotWorkDone)
{
Console.WriteLine("{0:T} - Method was locked, waiting...", DateTime.Now);
// whether to retry or continue depends on your specific scenario
// for demo, we'll retry. In cases where workers might receive
// duplicate payloads near-instantaneously and only one should
// succeed, you might just choose to continue.
Stopwatch time = Stopwatch.StartNew();
do
{
Thread.Sleep(500);
gotWorkDone = worker.DoWork();
Console.WriteLine("gotWorkDone: " + gotWorkDone);
} while (!gotWorkDone && time.Elapsed < TimeSpan.FromMinutes(1));
time.Stop();
if (!gotWorkDone)
{
Console.WriteLine("Timed out after 1 minute...");
}
}
Console.WriteLine("Press any key to quit, 'Q' to quit all...");
var ck = Console.ReadKey();
if (ck.KeyChar == 'Q')
{
allInstances = Process.GetProcessesByName(thisInstance.ProcessName);
foreach (var app in allInstances)
{
app.CloseMainWindow();
}
}
}
