Issue DLu#28: buffer range messages for each incoming topic and with …

…a maximum, configurable, buffer size

range_sensor_layer/CMakeLists.txt

@@ -2,6 +2,9 @@ cmake_minimum_required(VERSION 2.8.3)
 project(range_sensor_layer)
 set_directory_properties(PROPERTIES COMPILE_OPTIONS "-Wall;-Werror")
 
+# Required to use unordered maps
+add_definitions("-std=c++11")
+
 find_package(catkin REQUIRED COMPONENTS
     angles
     costmap_2d

range_sensor_layer/cfg/RangeSensorLayer.cfg

@@ -9,6 +9,7 @@ gen.add('enabled',               bool_t, 0, 'Whether to apply this plugin or not
 gen.add('phi',                 double_t, 0, 'Phi value', 1.2)
 gen.add('inflate_cone',        double_t, 0, 'Inflate the triangular area covered by the sensor (percentage)', 1, 0, 1)
 gen.add('no_readings_timeout', double_t, 0, 'No Readings Timeout', 0.0, 0.0)
+gen.add('ranges_buffer_size',     int_t, 0, 'Maximum number of ranges per topic to buffer until processing', 1, 1, 50)
 gen.add('clear_threshold',     double_t, 0, 'Probability below which cells are marked as free', 0.2, 0.0, 1.0)
 gen.add('mark_threshold',      double_t, 0, 'Probability above which cells are marked as occupied', 0.8, 0.0, 1.0)
 gen.add('clear_on_max_reading',  bool_t, 0, 'Clear on max reading', False)

range_sensor_layer/include/range_sensor_layer/range_sensor_layer.h

@@ -40,7 +40,7 @@ class RangeSensorLayer : public costmap_2d::CostmapLayer
 private:
   void reconfigureCB(range_sensor_layer::RangeSensorLayerConfig &config, uint32_t level);
 
-  void bufferIncomingRangeMsg(const sensor_msgs::RangeConstPtr& range_message);
+  void bufferIncomingRangeMsg(const sensor_msgs::RangeConstPtr& range_message, const std::string& topic);
   void processRangeMsg(sensor_msgs::Range& range_message);
   void processFixedRangeMsg(sensor_msgs::Range& range_message);
   void processVariableRangeMsg(sensor_msgs::Range& range_message);

range_sensor_layer/src/range_sensor_layer.cpp

@@ -41,6 +41,10 @@ void RangeSensorLayer::onInitialize()
   nh.param("ns", topics_ns, std::string());
   nh.param("topics", topic_names, topic_names);
 
+  int size;
+  nh.param("ranges_buffer_size", size, 1);
+  range_msgs_buffer_size_ = size;
+
   InputSensorType input_sensor_type = ALL;
   std::string sensor_type_name;
   nh.param("input_sensor_type", sensor_type_name, std::string("ALL"));
@@ -103,7 +107,9 @@ void RangeSensorLayer::onInitialize()
           name_.c_str(), sensor_type_name.c_str());
       }
 
-      range_subs_.push_back(nh.subscribe(topic_name, 100, &RangeSensorLayer::bufferIncomingRangeMsg, this));
+      range_subs_.push_back(nh.subscribe<sensor_msgs::Range>(topic_name, 100,
+                                                             boost::bind(&RangeSensorLayer::bufferIncomingRangeMsg,
+                                                                         this, _1, topic_name)));
 
       ROS_INFO("RangeSensorLayer: subscribed to topic %s", range_subs_.back().getTopic().c_str());
     }
@@ -176,12 +182,27 @@ void RangeSensorLayer::reconfigureCB(range_sensor_layer::RangeSensorLayerConfig
     enabled_ = config.enabled;
     current_ = false;
   }
+
+  if (config.ranges_buffer_size < range_msgs_buffer_size_)
+  {
+    boost::mutex::scoped_lock lock(range_message_mutex_);
+    std::unordered_map<std::string, std::list<sensor_msgs::Range>>::iterator buffer_it;
+    for(buffer_it = range_msgs_buffers_.begin(); buffer_it != range_msgs_buffers_.end(); buffer_it++)
+    {
+      while (buffer_it->second.size() > config.ranges_buffer_size)
+        buffer_it->second.pop_front();
+    }
+  }
+  range_msgs_buffer_size_ = config.ranges_buffer_size;
 }
 
-void RangeSensorLayer::bufferIncomingRangeMsg(const sensor_msgs::RangeConstPtr& range_message)
+void RangeSensorLayer::bufferIncomingRangeMsg(const sensor_msgs::RangeConstPtr& range_message,
+                                              const std::string& topic)
 {
   boost::mutex::scoped_lock lock(range_message_mutex_);
-  range_msgs_buffer_.push_back(*range_message);
+  range_msgs_buffers_[topic].push_back(*range_message);
+  if (range_msgs_buffers_[topic].size() > range_msgs_buffer_size_)
+    range_msgs_buffers_[topic].pop_front();
 }
 
 void RangeSensorLayer::updateCostmap()
@@ -196,7 +217,16 @@ void RangeSensorLayer::updateCostmap()
   for (std::list<sensor_msgs::Range>::iterator range_msgs_it = range_msgs_buffer_copy.begin();
        range_msgs_it != range_msgs_buffer_copy.end(); range_msgs_it++)
   {
-    processRangeMessageFunc_(*range_msgs_it);
+    range_message_mutex_.lock();
+    std::list<sensor_msgs::Range> range_msgs_buffer_copy = std::list<sensor_msgs::Range>(buffer_it->second);
+    buffer_it->second.clear();
+    range_message_mutex_.unlock();
+
+    for (std::list<sensor_msgs::Range>::iterator range_msgs_it = range_msgs_buffer_copy.begin();
+        range_msgs_it != range_msgs_buffer_copy.end(); range_msgs_it++)
+    {
+      processRangeMessageFunc_(*range_msgs_it);
+    }
   }
 }