From 66b62de750e75e1081ac8eeccca17f11b297d01a Mon Sep 17 00:00:00 2001 From: Anton Tananaev Date: Wed, 3 Sep 2014 00:09:42 +1200 Subject: Implement position filtering (fix #259) --- src/org/traccar/BasePipelineFactory.java | 22 ++-- src/org/traccar/FilterHandler.java | 133 +++++++++++++++++++++++++ src/org/traccar/helper/DistanceCalculator.java | 33 ++++++ 3 files changed, 181 insertions(+), 7 deletions(-) create mode 100644 src/org/traccar/FilterHandler.java create mode 100644 src/org/traccar/helper/DistanceCalculator.java (limited to 'src') diff --git a/src/org/traccar/BasePipelineFactory.java b/src/org/traccar/BasePipelineFactory.java index d7fcfe28a..e1f1e10e5 100644 --- a/src/org/traccar/BasePipelineFactory.java +++ b/src/org/traccar/BasePipelineFactory.java @@ -1,5 +1,5 @@ /* - * Copyright 2012 - 2013 Anton Tananaev (anton.tananaev@gmail.com) + * Copyright 2012 - 2014 Anton Tananaev (anton.tananaev@gmail.com) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -15,7 +15,6 @@ */ package org.traccar; -import java.net.InetAddress; import java.net.InetSocketAddress; import org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.buffer.ChannelBuffers; @@ -31,18 +30,19 @@ import org.traccar.model.DataManager; */ public abstract class BasePipelineFactory implements ChannelPipelineFactory { - private TrackerServer server; - private DataManager dataManager; - private Boolean loggerEnabled; + private final TrackerServer server; + private final DataManager dataManager; + private final Boolean loggerEnabled; + private final ReverseGeocoder reverseGeocoder; + private FilterHandler filterHandler; private Integer resetDelay; - private ReverseGeocoder reverseGeocoder; /** * Open channel handler */ protected class OpenChannelHandler extends SimpleChannelHandler { - private TrackerServer server; + private final TrackerServer server; public OpenChannelHandler(TrackerServer server) { this.server = server; @@ -95,6 +95,11 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory { if (resetDelayProperty != null) { resetDelay = Integer.valueOf(resetDelayProperty); } + + String enableFilter = serverManager.getProperties().getProperty("filter.enable"); + if (enableFilter != null && Boolean.valueOf(enableFilter)) { + filterHandler = new FilterHandler(serverManager); + } } protected DataManager getDataManager() { @@ -114,6 +119,9 @@ public abstract class BasePipelineFactory implements ChannelPipelineFactory { pipeline.addLast("logger", new StandardLoggingHandler()); } addSpecificHandlers(pipeline); + if (filterHandler != null) { + pipeline.addLast("filter", filterHandler); + } if (reverseGeocoder != null) { pipeline.addLast("geocoder", new ReverseGeocoderHandler(reverseGeocoder)); } diff --git a/src/org/traccar/FilterHandler.java b/src/org/traccar/FilterHandler.java new file mode 100644 index 000000000..18ae2ecae --- /dev/null +++ b/src/org/traccar/FilterHandler.java @@ -0,0 +1,133 @@ +/* + * Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com) + * + * 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. + */ +package org.traccar; + +import java.util.HashMap; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import org.jboss.netty.channel.Channel; +import org.jboss.netty.channel.ChannelHandlerContext; +import org.jboss.netty.handler.codec.oneone.OneToOneDecoder; +import org.traccar.helper.DistanceCalculator; +import org.traccar.helper.Log; +import org.traccar.model.Position; + +public class FilterHandler extends OneToOneDecoder { + + private boolean filterInvalid; + private boolean filterZero; + private boolean filterDuplicate; + private int filterDistance; + + private final Map lastPositions = new HashMap(); + + public FilterHandler(ServerManager serverManager) { + Properties properties = serverManager.getProperties(); + + String value = properties.getProperty("filter.invalid"); + if (value != null) filterInvalid = Boolean.valueOf(value); + + value = properties.getProperty("filter.zero"); + if (value != null) filterZero = Boolean.valueOf(value); + + value = properties.getProperty("filter.duplicate"); + if (value != null) filterDuplicate = Boolean.valueOf(value); + + value = properties.getProperty("filter.distance"); + if (value != null) filterDistance = Integer.valueOf(value); + } + + private boolean filterInvalid(Position position) { + return filterInvalid && !position.getValid(); + } + + private boolean filterZero(Position position) { + return filterZero && + (position.getLatitude() == 0.0) && + (position.getLongitude() == 0.0); + } + + private boolean filterDuplicate(Position position) { + if (filterDuplicate) { + Position last = lastPositions.get(position.getDeviceId()); + if (last != null) { + return position.getTime().equals(last.getTime()); + } else { + return false; + } + } else { + return false; + } + } + + private boolean filterDistance(Position position) { + if (filterDistance != 0) { + Position last = lastPositions.get(position.getDeviceId()); + if (last != null) { + double distance = DistanceCalculator.distance( + position.getLatitude(), position.getLongitude(), + last.getLatitude(), last.getLongitude()); + return distance < filterDistance; + } else { + return false; + } + } else { + return false; + } + } + + private boolean filter(Position p) { + + boolean result = + filterInvalid(p) || + filterZero(p) || + filterDuplicate(p) || + filterDistance(p); + + if (!result) { + lastPositions.put(p.getDeviceId(), p); + } else { + StringBuilder s = new StringBuilder(); + Log.info("Position filtered from " + p.getDeviceId()); + } + + return result; + } + + @Override + protected Object decode( + ChannelHandlerContext ctx, Channel channel, Object msg) + throws Exception { + + if (msg instanceof Position) { + if (filter((Position) msg)) { + return null; + } + } else if (msg instanceof List) { + Iterator i = ((List) msg).iterator(); + while (i.hasNext()) { + if (filter(i.next())) { + i.remove(); + } + } + } + + return msg; + } + +} diff --git a/src/org/traccar/helper/DistanceCalculator.java b/src/org/traccar/helper/DistanceCalculator.java new file mode 100644 index 000000000..072f3d7a8 --- /dev/null +++ b/src/org/traccar/helper/DistanceCalculator.java @@ -0,0 +1,33 @@ +/* + * Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com) + * + * 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. + */ +package org.traccar.helper; + +public class DistanceCalculator { + + private static final double equatorialEarthRadius = 6378.1370D; + private static final double deg2rad = (Math.PI / 180); + + public static double distance(double lat1, double lon1, double lat2, double lon2) { + double dlong = (lon2 - lon1) * deg2rad; + double dlat = (lat2 - lat1) * deg2rad; + double a = Math.pow(Math.sin(dlat / 2), 2) + + Math.cos(lat1 * deg2rad) * Math.cos(lat2 * deg2rad) * Math.pow(Math.sin(dlong / 2), 2); + double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)); + double d = equatorialEarthRadius * c; + return d * 1000; + } + +} -- cgit v1.2.3