time_expired_condition.cpp

// Copyright (c) 2019 Intel Corporation
// Copyright (c) 2020 Sarthak Mittal
//
// Licensed 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 <string>
#include <memory>
 
#include "behaviortree_cpp/condition_node.h"
 
#include "nav2_behavior_tree/plugins/condition/time_expired_condition.hpp"
 
namespace nav2_behavior_tree
{
 
TimeExpiredCondition::TimeExpiredCondition(
  const std::string & condition_name,
  const BT::NodeConfiguration & conf)
: BT::ConditionNode(condition_name, conf),
  period_(1.0)
{
}
 
void TimeExpiredCondition::initialize()
{
  getInput("seconds", period_);
  node_ = config().blackboard->get<nav2::LifecycleNode::SharedPtr>("node");
  start_ = node_->now();
}
 
BT::NodeStatus TimeExpiredCondition::tick()
{
  if (!BT::isStatusActive(status())) {
    initialize();
  }
 
  if (!BT::isStatusActive(status())) {
    start_ = node_->now();
    return BT::NodeStatus::FAILURE;
  }
 
  // Determine how long it's been since we've started this iteration
  auto elapsed = node_->now() - start_;
 
  // Now, get that in seconds
  auto seconds = elapsed.seconds();
 
  if (seconds < period_) {
    return BT::NodeStatus::FAILURE;
  }
 
  start_ = node_->now();  // Reset the timer
  return BT::NodeStatus::SUCCESS;
}
 
}  // namespace nav2_behavior_tree
 
#include "behaviortree_cpp/bt_factory.h"
BT_REGISTER_NODES(factory)
{
  factory.registerNodeType<nav2_behavior_tree::TimeExpiredCondition>("TimeExpired");
}