internal static void Serialize(object input, ISerializationContext context, Type expected)
{
GrainStateWithMetaDataAndETag <TView> instance = (GrainStateWithMetaDataAndETag <TView>)input;
SerializationManager.SerializeInner(instance.ETag, context, typeof(string));
SerializationManager.SerializeInner(instance.State, context, typeof(TView));
SerializationManager.SerializeInner(instance.GlobalVersion, context, typeof(int));
SerializationManager.SerializeInner(instance.WriteVector, context, typeof(string));
}
internal static object DeepCopier(object original, ICopyContext context)
{
GrainStateWithMetaDataAndETag <TView> instance = (GrainStateWithMetaDataAndETag <TView>)original;
string etag = (string)SerializationManager.DeepCopyInner(instance.ETag, context);
TView state = (TView)SerializationManager.DeepCopyInner(instance.State, context);
int globalVersion = (int)SerializationManager.DeepCopyInner(instance.GlobalVersion, context);
string writeVector = (string)SerializationManager.DeepCopyInner(instance.WriteVector, context);
return(new GrainStateWithMetaDataAndETag <TView>(etag, state, globalVersion, writeVector));
}
/// <inheritdoc/>
protected override async Task ReadAsync()
{
enter_operation("ReadAsync");
while (true)
{
try
{
// for manual testing
//await Task.Delay(5000);
var readState = new GrainStateWithMetaDataAndETag <TLogView>();
await globalGrainStorage.ReadStateAsync(grainTypeName, Services.GrainReference, readState);
GlobalStateCache = readState;
Services.Log(LogLevel.Debug, "read success {0}", GlobalStateCache);
LastPrimaryIssue.Resolve(Host, Services);
break; // successful
}
catch (Exception e)
{
LastPrimaryIssue.Record(new ReadFromStateStorageFailed()
{
Exception = e
}, Host, Services);
}
Services.Log(LogLevel.Debug, "read failed {0}", LastPrimaryIssue);
await LastPrimaryIssue.DelayBeforeRetry();
}
exit_operation("ReadAsync");
}
/// <inheritdoc/>
protected override void InitializeConfirmedView(TLogView initialstate)
{
GlobalStateCache = new GrainStateWithMetaDataAndETag <TLogView>(initialstate);
}
/// <inheritdoc/>
protected override async Task <int> WriteAsync()
{
enter_operation("WriteAsync");
var state = CopyTentativeState();
var updates = GetCurrentBatchOfUpdates();
bool batchsuccessfullywritten = false;
var nextglobalstate = new GrainStateWithMetaDataAndETag <TLogView>(state);
nextglobalstate.StateAndMetaData.WriteVector = GlobalStateCache.StateAndMetaData.WriteVector;
nextglobalstate.StateAndMetaData.GlobalVersion = GlobalStateCache.StateAndMetaData.GlobalVersion + updates.Length;
nextglobalstate.ETag = GlobalStateCache.ETag;
var writebit = nextglobalstate.StateAndMetaData.FlipBit(Services.MyClusterId);
try
{
// for manual testing
//await Task.Delay(5000);
await globalStorageProvider.WriteStateAsync(grainTypeName, Services.GrainReference, nextglobalstate);
batchsuccessfullywritten = true;
GlobalStateCache = nextglobalstate;
Services.Log(Severity.Verbose, "write ({0} updates) success {1}", updates.Length, GlobalStateCache);
LastPrimaryIssue.Resolve(Host, Services);
}
catch (Exception e)
{
LastPrimaryIssue.Record(new UpdateStateStorageFailed()
{
Exception = e
}, Host, Services);
}
if (!batchsuccessfullywritten)
{
Services.Log(Severity.Verbose, "write apparently failed {0} {1}", nextglobalstate, LastPrimaryIssue);
while (true) // be stubborn until we can read what is there
{
await LastPrimaryIssue.DelayBeforeRetry();
try
{
await globalStorageProvider.ReadStateAsync(grainTypeName, Services.GrainReference, GlobalStateCache);
Services.Log(Severity.Verbose, "read success {0}", GlobalStateCache);
LastPrimaryIssue.Resolve(Host, Services);
break;
}
catch (Exception e)
{
LastPrimaryIssue.Record(new ReadFromStateStorageFailed()
{
Exception = e
}, Host, Services);
}
Services.Log(Severity.Verbose, "read failed {0}", LastPrimaryIssue);
}
// check if last apparently failed write was in fact successful
if (writebit == GlobalStateCache.StateAndMetaData.GetBit(Services.MyClusterId))
{
GlobalStateCache = nextglobalstate;
Services.Log(Severity.Verbose, "last write ({0} updates) was actually a success {1}", updates.Length, GlobalStateCache);
batchsuccessfullywritten = true;
}
}
// broadcast notifications to all other clusters
if (batchsuccessfullywritten)
{
BroadcastNotification(new UpdateNotificationMessage()
{
Version = GlobalStateCache.StateAndMetaData.GlobalVersion,
Updates = updates.Select(se => se.Entry).ToList(),
Origin = Services.MyClusterId,
ETag = GlobalStateCache.ETag
});
}
exit_operation("WriteAsync");
if (!batchsuccessfullywritten)
{
return(0);
}
return(updates.Length);
}
