Get Compare Exchange Value Operation

• Use GetCompareExchangeValueOperation to return the saved compare-exchange Value for the specified Key.

• For an overview of the 'Compare Exchange' feature click: Compare Exchange Overview

• In this page:

  • Syntax
  • Example I - Value is 'long'
  • Example II - Value is a custom object

Syntax

Method:

public GetCompareExchangeValueOperation(string key)

Returned object:

public class CompareExchangeValue<T>
{
  public readonly string Key;
  public readonly T Value;
  public readonly long Index;
}

Parameter	Type	Description
Key	string	The unique object identifier
Value	T	The existing value that Key has
Index	long	The version number of the Value that is stored for the specified Key

Session Interface and Lazy Get

You can also get compare exchange values through the session cluster transactions at session.Advanced.ClusterTransaction.

This method also exposes methods getting compare exchange lazily.

Example I - Value is 'long'

CompareExchangeValue<long> readResult =
  store.Operations.Send(new GetCompareExchangeValueOperation<long>("NextClientId"));

long value = readResult.Value;

Example II - Value is a custom object

CompareExchangeValue<User> readResult =
  store.Operations.Send(new GetCompareExchangeValueOperation<User>("AdminUser"));

User admin = readResult.Value;