public CoreProjection(
string name, Guid projectionCorrelationId, IPublisher publisher,
IProjectionStateHandler projectionStateHandler, ProjectionConfig projectionConfig,
RequestResponseDispatcher
<ClientMessage.ReadStreamEventsBackward, ClientMessage.ReadStreamEventsBackwardCompleted> readDispatcher,
RequestResponseDispatcher <ClientMessage.WriteEvents, ClientMessage.WriteEventsCompleted> writeDispatcher,
ILogger logger = null)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (name == "")
{
throw new ArgumentException("name");
}
if (publisher == null)
{
throw new ArgumentNullException("publisher");
}
if (projectionStateHandler == null)
{
throw new ArgumentNullException("projectionStateHandler");
}
_projectionStateHandler = projectionStateHandler;
_projectionCorrelationId = projectionCorrelationId;
var namingBuilder = new ProjectionNamesBuilder();
_projectionStateHandler.ConfigureSourceProcessingStrategy(namingBuilder);
_name = namingBuilder.ForceProjectionName ?? name;
//TODO: move into name builder
_stateStreamNamePattern = namingBuilder.StateStreamName ?? ProjectionsStreamPrefix + _name + "-{0}" + ProjectionsStateStreamSuffix;
_stateStreamName = namingBuilder.StateStreamName ?? ProjectionsStreamPrefix + _name + ProjectionsStateStreamSuffix;
_projectionConfig = projectionConfig;
_logger = logger;
_publisher = publisher;
_readDispatcher = readDispatcher;
_writeDispatcher = writeDispatcher;
var builder = new CheckpointStrategy.Builder();
_projectionStateHandler.ConfigureSourceProcessingStrategy(builder);
_checkpointStrategy = builder.Build(_projectionConfig.Mode);
_partitionStateCache = new PartitionStateCache();
_processingQueue = new CoreProjectionQueue(
projectionCorrelationId, publisher, projectionConfig.PendingEventsThreshold, UpdateStatistics);
_checkpointManager = this._checkpointStrategy.CreateCheckpointManager(
this, projectionCorrelationId, this._publisher, this._readDispatcher,
this._writeDispatcher, this._projectionConfig, this._name, _stateStreamName);
GoToState(State.Initial);
}
public void setup()
{
_state = null;
_projection = null;
Given();
_logged = new List <string>();
_stateHandlerFactory = new ProjectionStateHandlerFactory();
_stateHandler = _stateHandlerFactory.Create(
"JS", _projection, s =>
{
if (!s.StartsWith("P:"))
{
_logged.Add(s);
}
else
{
Console.WriteLine(s);
}
}); // skip prelude debug output
_source = new SourceRecorder();
_stateHandler.ConfigureSourceProcessingStrategy(_source);
if (_state != null)
{
_stateHandler.Load(_state);
}
else
{
_stateHandler.Initialize();
}
}
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(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 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));
}
public void setup()
{
_state = null;
_projection = null;
Given();
_logged = new List<string>();
_stateHandlerFactory = new ProjectionStateHandlerFactory();
_stateHandler = _stateHandlerFactory.Create(
"JS", _projection, s =>
{
if (!s.StartsWith("P:")) _logged.Add(s);
else Console.WriteLine(s);
}); // skip prelude debug output
_source = new SourceRecorder();
_stateHandler.ConfigureSourceProcessingStrategy(_source);
if (_state != null)
_stateHandler.Load(_state);
else
_stateHandler.Initialize();
}
public CoreProjection(
string name, Guid projectionCorrelationId, IPublisher publisher,
IProjectionStateHandler projectionStateHandler, ProjectionConfig projectionConfig, ILogger logger = null)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (name == "")
{
throw new ArgumentException("name");
}
if (publisher == null)
{
throw new ArgumentNullException("publisher");
}
if (projectionStateHandler == null)
{
throw new ArgumentNullException("projectionStateHandler");
}
_projectionCorrelationId = projectionCorrelationId;
_name = name;
_projectionConfig = projectionConfig;
_logger = logger;
_publisher = publisher;
_projectionStateHandler = projectionStateHandler;
_readDispatcher =
new RequestResponseDispatcher
<ClientMessage.ReadEventsBackwards, ClientMessage.ReadEventsBackwardsCompleted>(
_publisher, v => v.CorrelationId, v => v.CorrelationId);
_projectionCheckpointStreamId = ProjectionsStreamPrefix + _name + ProjectionCheckpointStreamSuffix;
var builder = new CheckpointStrategy.Builder();
_projectionStateHandler.ConfigureSourceProcessingStrategy(builder);
_checkpointStrategy = builder.Build(_projectionConfig.Mode);
_eventFilter = _checkpointStrategy.EventFilter;
_lastProcessedEventPosition = new PositionTracker(_checkpointStrategy.PositionTagger);
_partitionStateCache = new PartitionStateCache();
GoToState(State.Initial);
}
public void Handle(CoreProjectionManagementMessage.CreateAndPrepare message)
{
try
{
//TODO: factory method can throw!
IProjectionStateHandler stateHandler = message.HandlerFactory();
// constructor can fail if wrong source defintion
//TODO: revise it
var sourceDefintionRecorder = new SourceDefintionRecorder();
stateHandler.ConfigureSourceProcessingStrategy(sourceDefintionRecorder);
var sourceDefintion = sourceDefintionRecorder.Build();
var projection = new CoreProjection(
message.Name, message.CorrelationId, _publisher, stateHandler, message.Config, _readDispatcher,
_writeDispatcher, _logger);
_projections.Add(message.CorrelationId, projection);
message.Envelope.ReplyWith(
new CoreProjectionManagementMessage.Prepared(message.CorrelationId, sourceDefintion));
}
catch (Exception ex)
{
message.Envelope.ReplyWith(
new CoreProjectionManagementMessage.Faulted(message.CorrelationId, ex.Message));
}
}