public async Task PutCmpXchgValue()
{
var prefix = Database.Name + "/";
var key = prefix + GetStringQueryString("key");
// ReSharper disable once PossibleInvalidOperationException
var index = GetLongQueryString("index", true).Value;
ServerStore.EnsureNotPassive();
using (ServerStore.ContextPool.AllocateOperationContext(out TransactionOperationContext context))
{
var updateJson = await context.ReadForMemoryAsync(RequestBodyStream(), "read-unique-value");
var command = new CompareExchangeCommand(key, updateJson, index);
using (var writer = new BlittableJsonTextWriter(context, ResponseBodyStream()))
{
(var raftIndex, _) = await ServerStore.SendToLeaderAsync(command);
await ServerStore.Cluster.WaitForIndexNotification(raftIndex);
using (context.OpenReadTransaction())
{
var res = ServerStore.Cluster.GetCmpXchg(context, key);
context.Write(writer, new DynamicJsonValue
{
[nameof(CmpXchgResult <object> .Index)] = res.Index,
[nameof(CmpXchgResult <object> .Value)] = res.Value,
[nameof(CmpXchgResult <object> .Successful)] = res.Index == raftIndex
});
}
writer.Flush();
}
}
}
public static Result <Command> FromString(string command, string[] parameters)
{
try
{
if (!Enum.TryParse <CommandType>(command, ignoreCase: true, out var parsedCommandType))
{
throw new ArgumentException(message: $"Could not parse `{nameof(CommandType)}` from string `{command}`", paramName: nameof(command));
}
Command?parsedCommand = null;
switch (parsedCommandType)
{
case CommandType.Get:
parsedCommand = new GetCommand();
break;
case CommandType.Set:
parsedCommand = new SetCommand()
{
Value = Encoding.UTF8.GetBytes(parameters[1]),
};
break;
case CommandType.CompareExchange:
parsedCommand = new CompareExchangeCommand()
{
Comparand = Encoding.UTF8.GetBytes(parameters[1]),
Value = Encoding.UTF8.GetBytes(parameters[2]),
};
break;
case CommandType.CompareRemove:
parsedCommand = new CompareRemoveCommand()
{
Comparand = Encoding.UTF8.GetBytes(parameters[1]),
};
break;
case CommandType.Remove:
parsedCommand = new RemoveCommand();
break;
case CommandType.PrefixEnumerate:
parsedCommand = new PrefixEnumerateCommand();
break;
}
Contract.Assert(parsedCommand != null);
parsedCommand.Key = Encoding.UTF8.GetBytes(parameters[0]);
return(new Result <Command>(parsedCommand));
}
catch (Exception e)
{
return(new Result <Command>(e, message: $"Failed to parse request `{command}` with parameters `{string.Join(", ", parameters)}`"));
}
}
public async Task PutCmpXchgValue()
{
var key = GetStringQueryString("key");
// ReSharper disable once PossibleInvalidOperationException
var index = GetLongQueryString("index", true).Value;
ServerStore.EnsureNotPassive();
using (ServerStore.ContextPool.AllocateOperationContext(out TransactionOperationContext context))
{
var updateJson = await context.ReadForMemoryAsync(RequestBodyStream(), "read-unique-value");
var command = new CompareExchangeCommand(key, updateJson, index);
var(raftIndex, _) = await ServerStore.SendToLeaderAsync(command);
await ServerStore.Cluster.WaitForIndexNotification(raftIndex);
HttpContext.Response.StatusCode = (int)HttpStatusCode.OK;
}
}
