public async Task CreateAggregationAsync(IndexDefinition indexDefinition)
{
var dynamicViewCompiler = new DynamicViewCompiler(indexDefinition.Name, indexDefinition, Path.Combine(_path, "Generators"));
var generator = dynamicViewCompiler.GenerateInstance();
var writeBatch = new WriteBatch();
var memoryStream = SmallObjectToMemoryStream(indexDefinition);
writeBatch.Put("aggregators/" + indexDefinition.Name, memoryStream);
await _storage.Writer.WriteAsync(writeBatch);
var aggregator = new Aggregator(this, indexDefinition.Name, generator);
_aggregations.AddOrUpdate(indexDefinition.Name, aggregator, (s, viewGenerator) => aggregator);
Background.Work(aggregator.StartAggregation);
}
private void ReadAllAggregations(DbIterator it)
{
Slice prefix = "aggregators/";
it.Seek(prefix);
while(it.WithPrefix(prefix))
{
string name = Encoding.UTF8.GetString(it.Key.Array, it.Key.Offset, it.Key.Count);
using (var stream = it.CreateValueStream())
{
var indexDefinition =
new JsonSerializer().Deserialize<IndexDefinition>(new JsonTextReader(new StreamReader(stream)));
_log.Info("Reading aggregator {0}", indexDefinition.Name);
AbstractViewGenerator generator = null;
try
{
var dynamicViewCompiler = new DynamicViewCompiler(indexDefinition.Name, indexDefinition,
Path.Combine(_path, "Generators"));
generator = dynamicViewCompiler.GenerateInstance();
}
catch (Exception e)
{
_log.WarnException("Could not create instance of aggregator " + indexDefinition.Name, e);
// could not create generator, ignoring this and deleting the generator
RemoveAggregation(name);
}
if (generator != null)
{
var aggregator = new Aggregator(this, indexDefinition.Name, generator);
_aggregations.TryAdd(indexDefinition.Name, aggregator);
Background.Work(aggregator.StartAggregation);
}
}
it.Next();
}
}