/// <summary>
/// Launches an Task on this context.
/// </summary>
/// <param name="taskConfiguration"></param>
/// <param name="contextId"></param>
/// <param name="heartBeatManager"></param>
public void StartTask(TaskConfiguration taskConfiguration, string contextId, HeartBeatManager heartBeatManager)
{
lock (_contextLifeCycle)
{
bool taskPresent = _task.IsPresent();
bool taskEnded = taskPresent && _task.Value.HasEnded();
LOGGER.Log(Level.Info, "ContextRuntime::StartTask(TaskConfiguration)" + "task is present: " + taskPresent + " task has ended: " + taskEnded);
if (taskPresent)
{
LOGGER.Log(Level.Info, "Task state: " + _task.Value.GetTaskState());
}
if (taskEnded)
{
// clean up state
_task = Optional <TaskRuntime> .Empty();
taskPresent = false;
}
if (taskPresent)
{
var e = new InvalidOperationException(
string.Format(CultureInfo.InvariantCulture, "Attempting to spawn a child context when an Task with id '{0}' is running", _task.Value.TaskId)); // note: java code is putting thread id here
Org.Apache.REEF.Utilities.Diagnostics.Exceptions.Throw(e, LOGGER);
}
if (_childContext.IsPresent())
{
var e = new InvalidOperationException("Attempting to instantiate a child context on a context that is not the topmost active context.");
Org.Apache.REEF.Utilities.Diagnostics.Exceptions.Throw(e, LOGGER);
}
try
{
IInjector taskInjector = _contextInjector.ForkInjector(taskConfiguration.TangConfig);
LOGGER.Log(Level.Info, "Trying to inject task with configuration" + taskConfiguration.ToString());
TaskRuntime taskRuntime = new TaskRuntime(taskInjector, contextId, taskConfiguration.TaskId, heartBeatManager); // taskInjector.getInstance(TaskRuntime.class);
taskRuntime.Initialize();
System.Threading.Tasks.Task.Run(new Action(taskRuntime.Start));
_task = Optional <TaskRuntime> .Of(taskRuntime);
}
catch (Exception e)
{
var ex = new TaskClientCodeException(taskConfiguration.TaskId, Id, "Unable to instantiate the new task", e);
Org.Apache.REEF.Utilities.Diagnostics.Exceptions.CaughtAndThrow(ex, Level.Error, "Task start error.", LOGGER);
}
}
}
