CODEWITHSUNDEEP
c#.net
Sumee
Sumee

Reputation: 377

Managing a storage pool for multiple threads

I have an application which is used read and write data to different storage locations. There is a concept of storage pool that contains multiple storage devices. Only one device can be active at a time for writing content. Intially the first storage device in a pool is considered active. As soon as it gets full or inaccessible, the next device should become active.

I have a class ProviderManager with following interface.

public class DeviceManager
{
      public StorageDevice CurrentDevice {get; private set;}
      public bool MoveNext() { // get device on next index }
}

The problem is that we move the next device only when there is an exception that means its either filled or inaccessible. There could be a situation when multiple threads fail to write on a device and DeviceManager.MoveNext() is called by each thread instead of only one of them calling it.

Although, I can manage it but that involves some dirty work. Looking for a nice way to manage this.

Your ideas?

Upvotes: 2

Views: 156

Answers (3)

Anders Abel
Anders Abel

Reputation: 69260

Why do you even expose MoveNext to the caller? From your description I think that DeviceManager should be responsible for handling errors and for moving on to the next device.

Is there some way that you can get DeviceManager to intercept the write exceptions?

Upvotes: 0

Oleg
Oleg

Reputation: 798

MoveNext()
{
   if(Current.isAccessible)
        return;
   <....>
}

of course MoveNext call should be synchronized

Upvotes: 0

Henk Holterman
Henk Holterman

Reputation: 273274

How about 

   public bool MoveNext(StorageDevice oldDevice)

As long as MoveNext is thread-safe, just check if Current == oldDevice before changing.

Upvotes: 4

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