public void Handle(ProjectionMessage.CoreService.Management.Create message)
{
try
{
//TODO: factory method can throw!
IProjectionStateHandler stateHandler = message.HandlerFactory();
// constructor can fail if wrong source defintion
//TODO: revise it
var projection = new CoreProjection(message.Name, message.CorrelationId, _publisher, stateHandler, message.Config, _readDispatcher, _writeDispatcher, _logger);
_projections.Add(message.CorrelationId, projection);
}
catch (Exception ex)
{
message.Envelope.ReplyWith(new ProjectionMessage.Projections.StatusReport.Faulted(message.CorrelationId, ex.Message));
}
}
private void Start(ProjectionStateHandlerFactory handlerFactory, ProjectionConfig config)
{
if (handlerFactory == null)
{
throw new ArgumentNullException("handlerFactory");
}
if (config == null)
{
throw new ArgumentNullException("config");
}
if (_state == ManagedProjectionState.Running)
{
throw new InvalidOperationException("Already started");
}
//TODO: load configuration from the definition
var createProjectionMessage = new ProjectionMessage.CoreService.Management.Create(new PublishEnvelope(_inputQueue), _id, _name, config, delegate
{
IProjectionStateHandler stateHandler = null;
try
{
stateHandler = handlerFactory.Create(this.HandlerType, this.Query, Console.WriteLine);
var checkpointStrategyBuilder = new CheckpointStrategy.Builder();
stateHandler.ConfigureSourceProcessingStrategy(checkpointStrategyBuilder);
checkpointStrategyBuilder.Validate(Mode); // avoid future exceptions in coreprojection
return(stateHandler);
}
catch (Exception ex)
{
SetFaulted(String.Format("Cannot create a projection state handler.\r\n\r\nHandler type: {0}\r\nQuery:\r\n\r\n{1}\r\n\r\nMessage:\r\n\r\n{2}", HandlerType, Query, ex.Message), ex);
if (stateHandler != null)
{
stateHandler.Dispose();
}
throw;
}
});
//note: set runnign before start as coreProjection.start() can respond with faulted
_state = ManagedProjectionState.Running;
_coreQueue.Publish(createProjectionMessage);
_coreQueue.Publish(new ProjectionMessage.Projections.Management.Start(_id));
}
private void Start(ProjectionStateHandlerFactory handlerFactory, ProjectionConfig config)
{
if (handlerFactory == null) throw new ArgumentNullException("handlerFactory");
if (config == null) throw new ArgumentNullException("config");
if (_state == ManagedProjectionState.Running)
throw new InvalidOperationException("Already started");
//TODO: load configuration from the definition
var createProjectionMessage = new ProjectionMessage.CoreService.Management.Create(new PublishEnvelope(_inputQueue), _id, _name, config, delegate
{
IProjectionStateHandler stateHandler = null;
try
{
stateHandler = handlerFactory.Create(this.HandlerType, this.Query, Console.WriteLine);
var checkpointStrategyBuilder = new CheckpointStrategy.Builder();
stateHandler.ConfigureSourceProcessingStrategy(checkpointStrategyBuilder);
checkpointStrategyBuilder.Validate(Mode); // avoid future exceptions in coreprojection
return stateHandler;
}
catch (Exception ex)
{
SetFaulted(String.Format("Cannot create a projection state handler.\r\n\r\nHandler type: {0}\r\nQuery:\r\n\r\n{1}\r\n\r\nMessage:\r\n\r\n{2}", HandlerType, Query, ex.Message), ex);
if (stateHandler != null)
stateHandler.Dispose();
throw;
}
});
//note: set runnign before start as coreProjection.start() can respond with faulted
_state = ManagedProjectionState.Running;
_coreQueue.Publish(createProjectionMessage);
_coreQueue.Publish(new ProjectionMessage.Projections.Management.Start(_id));
}
