protected override AsyncHandlerResult InternalExecute(AsyncEvent asyncEvent)
{
try
{
this.Init();
this.DoWork();
}
catch (Exception exception)
{
// 异步作业不允许抛异常，只记录日志。
MyTrace.Write(ESB_TraceCategory.DataDistribution, TraceLevel.Error,
"分发日志到业务系统时出现未捕获的异常，异常信息为【{0}】",
exception.ToString());
}
return new AsyncSucceededResult();
}
/// <summary>
/// Executes the specified asynchronous event.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <returns></returns>
public AsyncHandlerResult Execute(AsyncEvent asyncEvent)
{
AsyncHandlerResult result = null;
try
{
MyTrace.Write(TraceCategory.AsyncService, TraceLevel.Info,
"正在执行异步作业。AsyncOperationId: {0} AsyncOperationType: {1} Command: {2}", asyncEvent.EventId,
asyncEvent.OperationType, GetType().FullName);
result = this.InternalExecute(asyncEvent);
}
catch (System.Exception ex)
{
MyTrace.Write(TraceCategory.AsyncService, TraceLevel.Error,
"执行异步作业时遭遇异常。AsyncOperationId: {0} AsyncOperationType: {1} - {2}",
asyncEvent.EventId,
asyncEvent.OperationType,
ex);
throw;
}
return result;
}
/// <summary>
/// Tracks the begin outstanding operation.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
internal void TrackBeginOutstandingOperation(AsyncEvent asyncEvent)
{
lock (_outstandingOperations)
{
_outstandingOperations.Add(asyncEvent);
Counters.TrackBeginOutstandingOperation(asyncEvent.OperationType);
}
}
/// <summary>
/// Tracks the begin executing operation.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
internal void TrackBeginExecutingOperation(AsyncEvent asyncEvent)
{
lock (_executingOperations)
{
_executingOperations.Add(asyncEvent);
if (Counters != null)
{
Counters.TrackBeginExecutingOperation(asyncEvent.OperationType);
asyncEvent.BeginAsynchronousEventProcessing();
}
}
}
/// <summary>
/// Sets the pause and exit request.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
internal void SetPauseAndExitRequest(AsyncEvent asyncEvent)
{
if (TryGetEventId(asyncEvent.EventId) == AsyncHandlerEarlyExitRequest.Continue)
{
SetEventState(asyncEvent.EventId, AsyncHandlerEarlyExitRequest.Pause);
asyncEvent.AutoResumeFromPause = true;
}
}
/// <summary>
/// Handles the special transition.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <returns></returns>
internal AsyncHandlerResult HandleSpecialTransition(AsyncEvent asyncEvent)
{
AsyncHandlerEarlyExitRequest asyncHandlerEarlyExitRequest = QueryForEarlyExitRequest(asyncEvent.EventId);
if (asyncHandlerEarlyExitRequest != AsyncHandlerEarlyExitRequest.Continue)
{
return DoSpecialTransition(asyncEvent.EventId, asyncHandlerEarlyExitRequest, true, asyncEvent.AutoResumeFromPause,
_dataAccessFactory.CreateInstance(this, Configuration.OrganizationConfiguration), asyncEvent.ExecutionTimeSeconds);
}
return null;
}
/// <summary>
/// Nexts the occurrence.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <returns></returns>
public DateTime NextOccurrence(AsyncEvent asyncEvent)
{
if (asyncEvent.RecurrenceEndTime.HasValue && asyncEvent.RecurrenceEndTime <= DateTime.Now)
{
return DateTime.MinValue;
}
try
{
return RecurrencePatternFactory.NextOccurrence(asyncEvent.RecurrencePattern, asyncEvent.RecurrenceStartTime);
}
catch (InvalidRecurrenceRuleException e)
{
MyTrace.Write(TraceCategory.AsyncService, TraceLevel.Error, "{0}: 作业{1}的重复规则错误。{2}", InstanceName, asyncEvent.EventId, e.Message);
EventLog.WriteEntry(EventLogEntryType.Error, 0, e.Message);
}
return DateTime.MinValue;
}
/// <summary> /// Internals the execute. /// 注意：如果方法体内抛出非WebException、TargetInvocationException、SqlException、SoapException、MyException、FaultException、 /// InvalidPluginExecutionException、TimeoutException、CommunicationException、EndpointNotFoundException类型，将会导致服务崩溃 /// </summary> /// <param name="asyncEvent">The asynchronous event.</param> /// <returns></returns> protected abstract AsyncHandlerResult InternalExecute(AsyncEvent asyncEvent);
/// <summary>
/// Determines whether this instance [can clear data] the specified new state.
/// </summary>
/// <param name="newState">The new state.</param>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <returns></returns>
private bool CanClearData(int newState, AsyncEvent asyncEvent)
{
return newState == 3;
}
/// <summary>
/// Updates the state of the event.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <param name="result">The result.</param>
private void UpdateEventState(AsyncEvent asyncEvent, AsyncHandlerResult result)
{
var instance = this._dataAccessFactory.CreateInstance(this, Configuration.OrganizationConfiguration);
var newStatus = result.ResultCode;
int newState = 3;
int errorCode = 0;
string errorMessage = null;
string friendlyMessage = null;
bool retryOperation = false;
var handlerResultWithError = result as AsyncHandlerResultWithError;
if (handlerResultWithError != null)
{
errorCode = handlerResultWithError.ErrorCode;
errorMessage = handlerResultWithError.ErrorMessage;
friendlyMessage = handlerResultWithError.FriendlyMessage;
}
else
{
var resultWithMessage = result as AsyncHandlerResultWithMessage;
if (resultWithMessage != null)
friendlyMessage = resultWithMessage.Message;
}
var nextOccurrence = DateTime.MinValue;
if (result is AsyncRetryResult)
{
if (asyncEvent.RetryCount < this.Configuration.MaximumRetries || errorCode == -2147180543) // -2147180543 = The server is busy and the request was not completed. Try again later.
{
retryOperation = true;
}
else
{
nextOccurrence = DateTime.MaxValue;
LogEvent(EventLogEntryType.Error, 3221242897L, Environment.MachineName, asyncEvent.OperationType, errorCode.ToString("x", (IFormatProvider)CultureInfo.InvariantCulture),
errorMessage);
}
}
var asyncPausedResult = result as AsyncPausedResult;
if (asyncPausedResult != null && asyncPausedResult.PostponeUntil != DateTime.MinValue)
nextOccurrence = asyncPausedResult.PostponeUntil;
switch (newStatus)
{
case 20:
return;
case 21:
case 10:
if (retryOperation && this.HandleSpecialTransition(asyncEvent) != null)
return;
newState = 1;
newStatus = 10;
break;
case 22:
case 32:
newState = 3;
newStatus = 32;
break;
case 0:
AsyncServiceException.Assert(false, "错误状态: " + newStatus);
break;
}
if (result is AsyncSystemPausedResult)
nextOccurrence = DateTime.MaxValue;
if (asyncEvent.IsRecurrenceEvent)
{
nextOccurrence = NextOccurrence(asyncEvent);
if (nextOccurrence == DateTime.MinValue)
{
newState = 3;
newStatus = 30;
}
else
{
newState = 1;
newStatus = 10;
}
}
if (newState == 1 && newStatus == 10 && asyncEvent.AutoResumeFromPause)
nextOccurrence = DateTime.Now.AddMinutes(1.0);
var newEventState = new AsyncEventState()
{
EventId = asyncEvent.EventId,
NewState = newState,
NewStatus = newStatus,
NextOccurrence = nextOccurrence,
RetryOperation = retryOperation,
CurrentRetryCount = asyncEvent.RetryCount,
ErrorCode = errorCode,
ErrorMessage = errorMessage,
FriendlyMessage = friendlyMessage,
ClearData = this.CanClearData(newState, asyncEvent),
ExecutionTime = asyncEvent.ExecutionTimeSeconds,
CanRemoveEvent = this.CanRemoveEvent(asyncEvent, result),
HandlerResult = result
};
instance.UpdateStateAndStatus(newEventState);
RemoveSpecialTransition(asyncEvent.EventId);
}
/// <summary>
/// Processes the asynchronous event.
/// </summary>
/// <param name="eventData">The event data.</param>
/// <returns></returns>
public AsyncHandlerResult ProcessAsyncEvent(AsyncEvent eventData)
{
AsyncServiceException.Assert(eventData != null, "异步服务池处理器只能处理异步事件。");
if (_queueManager.ShuttingDown)
{
_queueManager.TrackCompleteOutstandingOperation(eventData, null, false);
return null;
}
MyTrace.Write(TraceCategory.AsyncService, TraceLevel.Info,
"正在处理异步作业。Id: {0} 作业类型: {1}", eventData.EventId, eventData.OperationType);
var result = _queueManager.HandleSpecialTransition(eventData);
if (result != null)
{
_queueManager.TrackCompleteOutstandingOperation(eventData, result, false);
}
else
{
SemaphoreSlim semaphoreSlim = null;
bool hasDone = false;
if (
_queueManager.Configuration.OperationTypeThrottle.TryGetValue(eventData.OperationType,
out semaphoreSlim) &&
!semaphoreSlim.Wait(0))
{
var failure = new AsyncFailedResult(new AsyncServiceException("服务正忙且请求未被完成，请稍后重试。"))
{
FriendlyMessage = "服务正忙且请求未被完成，请稍后重试。"
};
result = new AsyncRetryResult(failure);
hasDone = true;
}
if (!hasDone)
_queueManager.TrackBeginExecutingOperation(eventData);
if (_queueManager.ShuttingDown)
{
_queueManager.TrackCompleteOutstandingOperation(eventData, result, false);
return result;
}
try
{
if (!hasDone)
result = _handler(eventData);
}
catch (Exception ex)
{
ErrorAction action = _errorHandler.Handle(ex);
AsyncServiceException.Assert(action != null, "错误处理后的动作不应为null。");
string errorFormat = action.ErrorMessage == null ? string.Empty : action.ErrorMessage;
result = new AsyncFailedResult(ex, action.ErrorCode, errorFormat);
switch (action.Type)
{
case ErrorActionType.Retry:
result = new AsyncRetryResult((AsyncFailedResult) result);
break;
case ErrorActionType.Fail:
break;
case ErrorActionType.Suspend:
if (action.ErrorCode == -2147204743)
{
result = new AsyncPausedResult(DateTime.Now.AddMinutes(0));
break;
}
else
{
result = new AsyncSystemPausedResult(action.ErrorCode, "{0}", action.ErrorMessage);
break;
}
default:
result = new AsyncSystemPausedResult(ex);
throw;
}
}
finally
{
EndAsynchronousEventProcessing(eventData, result);
}
}
return result;
}
/// <summary>
/// Events the handler.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
public void EventHandler(AsyncEvent asyncEvent)
{
_queueManager.TrackBeginOutstandingOperation(asyncEvent);
_executionEngine.Enqueue(_queueManager.OperationsFactory.CreateAsyncEventOperation(asyncEvent, this));
}
/// <summary>
/// Ends the asynchronous event processing.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <param name="result">The result.</param>
internal void EndAsynchronousEventProcessing(AsyncEvent asyncEvent, AsyncHandlerResult result)
{
_queueManager.EndAsynchronousEventProcessing(asyncEvent, result);
}
/// <summary>
/// Handles the specified asynchronous event.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <returns></returns>
public AsyncHandlerResult Handle(AsyncEvent asyncEvent)
{
AsyncOperationCommand operationCommand = this._operationFactory.GetOperationCommand(asyncEvent);
return operationCommand.Execute(asyncEvent);
}
/// <summary>
/// Tracks the complete executing operation.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <param name="result">The result.</param>
internal void TrackCompleteExecutingOperation(AsyncEvent asyncEvent, AsyncHandlerResult result)
{
lock (_executingOperations)
{
if (result is AsyncInProgressResult) return;
if (_executingOperations.Remove(asyncEvent))
{
Counters.TrackCompleteExecutingOperation(asyncEvent.OperationType);
SemaphoreSlim semaphoreSlim = null;
if (Configuration.OperationTypeThrottle.TryGetValue(asyncEvent.OperationType, out semaphoreSlim))
{
semaphoreSlim.Release();
}
}
if (_shutdownEvent != null && _executingOperations.Count == 0)
{
_shutdownEvent.Set();
}
}
}
/// <summary>
/// Tracks the complete outstanding operation.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <param name="result">The result.</param>
/// <param name="executionStarted">if set to <c>true</c> [execution started].</param>
internal void TrackCompleteOutstandingOperation(AsyncEvent asyncEvent, AsyncHandlerResult result, bool executionStarted)
{
lock (_outstandingOperations)
{
if (result is AsyncInProgressResult) return;
if (!_outstandingOperations.Remove(asyncEvent)) return;
Counters.TrackCompleteOutstandingOperation(asyncEvent.OperationType, result, asyncEvent.ExecutionTime);
if (executionStarted)
{
_startThreadHandler();
}
}
}
/// <summary>
/// Creates the one operation from recurrence pattern.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
public void CreateOneOperationFromRecurrencePattern(AsyncEvent asyncEvent)
{
var queueDataAccess = _dataAccessFactory.CreateInstance(this, Configuration.OrganizationConfiguration);
queueDataAccess.CreateOneOperationFromRecurrencePattern(asyncEvent);
}
/// <summary>
/// Determines whether this instance [can remove event] the specified asynchronous event.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <param name="result">The result.</param>
/// <returns></returns>
private bool CanRemoveEvent(AsyncEvent asyncEvent, AsyncHandlerResult result)
{
var asyncRemoveEventResult = result as AsyncRemoveEventResult;
return asyncRemoveEventResult != null;
}
/// <summary>
/// Ends the asynchronous event processing.
/// </summary>
/// <param name="asyncEvent">The asynchronous event.</param>
/// <param name="result">The result.</param>
public void EndAsynchronousEventProcessing(AsyncEvent asyncEvent, AsyncHandlerResult result)
{
UpdateEventState(asyncEvent, result);
TrackCompleteExecutingOperation(asyncEvent, result);
TrackCompleteOutstandingOperation(asyncEvent, result, true);
}