/// <summary>
/// Execute the method specified in the task.
/// If the task-object contains an object-host pair data, then the method
/// will be executed on that object - otherwise, a brand new non-persistent
/// object of the type specified in the task will be created and the method
/// will be executed in that object.
/// </summary>
/// <param name="task">task</param>
public void ExecuteTask(Task task)
{
try
{
// mark engine as busy for the taskbroker
TaskBroker.UpdateEngineStatus(this.EngineId, EngineStatus.Busy);
_task = task;
object objectToProcess = null;
bool persistent = false;
// Check if the task contains a reference to a specific object
if (task.ObjectData != null)
{
if (_objectCollection.ContainsKey(task.ObjectData.ObjectId))
{
persistent = true;
objectToProcess = _objectCollection[task.ObjectData.ObjectId];
}
}
// otherwise we instantiate a (non-persistent) object of the specified type
else
{
Assembly assembly = Assembly.LoadFrom(String.Format(@"{0}\{1}.dll", this.ResourcePath, task.Assembly));
objectToProcess = assembly.CreateInstance(task.TypeName);
_log.DebugFormat("Create non-persistent object: {0}", task.TypeName);
}
// execute the method on the relevant object
objectToProcess.GetType().GetMethod(task.MethodName).Invoke(objectToProcess, new object[] { task.Args });
// dispose the object if it's non-persistent
if (!persistent && (objectToProcess as IDisposable) != null)
{
(objectToProcess as IDisposable).Dispose();
}
}
catch (Exception e)
{
_log.ErrorFormat("Error occured while executing task {0}:{1}\n{2}\nAssembly:{3}\nType:{4}\nMethod:{5}"
, task.TaskId, e.Message, e.StackTrace, task.Assembly, task.TypeName, task.MethodName);
}
finally
{
// mark engine as idle for the taskbroker
TaskBroker.UpdateEngineStatus(this.EngineId, EngineStatus.Idle);
}
}
/// <summary>
/// Create persistent object on this engine
/// </summary>
/// <param name="task">task</param>
/// <returns>host-object pair containing object data</returns>
public HostObjectPair CreateObject(Task task)
{
HostObjectPair hoPair = null;
_task = task;
try
{
string objectId = String.Format("object_{0}_{1}", this.EngineId, Guid.NewGuid().ToString());
Assembly assembly = Assembly.LoadFrom(String.Format(@"{0}\{1}.dll", this.ResourcePath, task.Assembly));
_objectCollection[objectId] = assembly.CreateInstance(task.TypeName);
hoPair = new HostObjectPair();
hoPair.HostId = this.EngineId.ToString();
hoPair.ObjectId = objectId;
_log.DebugFormat("Create persistent object: {0} with id: {1}", task.TypeName, objectId);
}
catch (Exception e)
{
_log.ErrorFormat("Error occured while creating object for task {0}:{1}\n{2}\nAssembly:{3}\nType:{4}"
, task.TaskId, e.Message, e.StackTrace, task.Assembly, task.TypeName);
}
return hoPair;
}
