private void Start(IPublisher coreOutput, ProjectionStateHandlerFactory handlerFactory, ProjectionConfig config)
{
if (coreOutput == null) throw new ArgumentNullException("coreOutput");
if (handlerFactory == null) throw new ArgumentNullException("handlerFactory");
if (config == null) throw new ArgumentNullException("config");
if (_coreProjection != null)
throw new InvalidOperationException("CoreProjection has been already created");
IProjectionStateHandler stateHandler = null;
try
{
stateHandler = handlerFactory.Create(HandlerType, Query, Console.WriteLine);
var checkpointStrategyBuilder = new CheckpointStrategy.Builder();
stateHandler.ConfigureSourceProcessingStrategy(checkpointStrategyBuilder);
checkpointStrategyBuilder.Validate(this.Mode); // avoid future exceptions in coreprojection
// constructor can fail if wrong source defintion
//TODO: revise it
_coreProjection = new CoreProjection(_name, _id, coreOutput, stateHandler, config, _logger);
}
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();
return;
}
//TODO: load configuration from the definition
_state = ManagedProjectionState.Running;
//note: set runnign before start as coreProjection.start() can respond with faulted
_coreProjection.Start();
}
private void BeginCreateAndPrepare(
ProjectionStateHandlerFactory handlerFactory, ProjectionConfig config,
Action onPrepared)
{
_onPrepared = onPrepared;
if (handlerFactory == null) throw new ArgumentNullException("handlerFactory");
if (config == null) throw new ArgumentNullException("config");
//TODO: which states are allowed here?
if (_state >= ManagedProjectionState.Preparing)
throw new InvalidOperationException("Already preparing or has been prepared");
//TODO: load configuration from the definition
var createProjectionMessage =
new CoreProjectionManagementMessage.CreateAndPrepare(
new PublishEnvelope(_inputQueue), _id, _name, config, delegate
{
// this delegate runs in the context of a projection core thread
// TODO: move this code to the projection core service as we may be in different processes in the future
IProjectionStateHandler stateHandler = null;
try
{
stateHandler = handlerFactory.Create(HandlerType, 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.Preparing;
_coreQueue.Publish(createProjectionMessage);
}
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));
}