src/SchedulingAgent.cpp

/**
 * @file SchedulingAgent.cpp
 * SchedulingAgent class implementation
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <chrono>
#include <thread>
#include <iostream>
#include "Exception.h"
#include "SchedulingAgent.h"

bool SchedulingAgent::hasWorkToDo(Processor *processor)
{
	// Whether it has work to do
	if (processor->getTriggerWhenEmpty() || !processor->hasIncomingConnections() ||
			processor->flowFilesQueued())
		return true;
	else
		return false;
}

bool SchedulingAgent::hasTooMuchOutGoing(Processor *processor)
{
	return processor->flowFilesOutGoingFull();
}

bool SchedulingAgent::onTrigger(Processor *processor)
{
	if (processor->isYield())
		return false;

	// No need to yield, reset yield expiration to 0
	processor->clearYield();

	if (!hasWorkToDo(processor))
		// No work to do, yield
		return true;

	if(hasTooMuchOutGoing(processor))
		// need to apply backpressure
		return true;

	//TODO runDuration

	processor->incrementActiveTasks();
	try
	{
		processor->onTrigger();
		processor->decrementActiveTask();
	}
	catch (Exception &exception)
	{
		// Normal exception
		_logger->log_debug("Caught Exception %s", exception.what());
		processor->decrementActiveTask();
	}
	catch (std::exception &exception)
	{
		_logger->log_debug("Caught Exception %s", exception.what());
		processor->yield(_administrativeYieldDuration);
		processor->decrementActiveTask();
	}
	catch (...)
	{
		_logger->log_debug("Caught Exception during SchedulingAgent::onTrigger");
		processor->yield(_administrativeYieldDuration);
		processor->decrementActiveTask();
	}

	return false;
}