/// <summary>
/// Removes the saga data instance from the index file
/// </summary>
public async Task Delete(ISagaData sagaData)
{
using (new FileSystemExclusiveLock(_lockFile, _log))
{
var index = new FileSystemSagaIndex(_basePath);
var id = sagaData.Id;
if (!index.Contains(id))
{
throw new ConcurrencyException($"Saga data with ID {id} no longer exists and cannot be deleted");
}
index.Remove(id);
sagaData.Revision++;
}
}
/// <summary>
/// Inserts the given saga data instance into the index file
/// </summary>
public async Task Insert(ISagaData sagaData, IEnumerable <ISagaCorrelationProperty> correlationProperties)
{
using (new FileSystemExclusiveLock(_lockFile, _log))
{
var index = new FileSystemSagaIndex(_basePath);
var id = GetId(sagaData);
if (sagaData.Revision != 0)
{
throw new InvalidOperationException($"Attempted to insert saga data with ID {id} and revision {sagaData.Revision}, but revision must be 0 on first insert!");
}
var existingSaga = index.FindById(id);
if (existingSaga != null)
{
throw new ConcurrencyException($"Saga data with ID {id} already exists!");
}
index.Insert(sagaData, correlationProperties);
}
}
/// <summary>
/// Updates the given saga data instance in the index file
/// </summary>
public async Task Update(ISagaData sagaData, IEnumerable <ISagaCorrelationProperty> correlationProperties)
{
using (new FileSystemExclusiveLock(_lockFile, _log))
{
var index = new FileSystemSagaIndex(_basePath);
var id = GetId(sagaData);
var existingCopy = index.FindById(id);
if (existingCopy == null)
{
throw new ConcurrencyException($"Saga data with ID {id} does not exist!");
}
if (existingCopy.Revision != sagaData.Revision)
{
throw new ConcurrencyException($"Attempted to update saga data with ID {id} with revision {sagaData.Revision}, but the existing data was updated to revision {existingCopy.Revision}");
}
sagaData.Revision++;
index.Insert(sagaData, correlationProperties);
}
}
/// <summary>
/// Looks up an existing saga data instance from the index file
/// </summary>
public async Task <ISagaData> Find(Type sagaDataType, string propertyName, object propertyValue)
{
using (new FileSystemExclusiveLock(_lockFile, _log))
{
var index = new FileSystemSagaIndex(_basePath);
if (propertyName == IdPropertyName)
{
var sagaData = index.FindById((Guid)propertyValue);
if (!sagaDataType.IsInstanceOfType(sagaData))
{
return(null);
}
return(sagaData);
}
return(index.Find(sagaDataType, propertyName, propertyValue));
}
}
