Refactor position and event handlers

1 files changed, 145 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/ProcessingHandler.java b/src/main/java/org/traccar/ProcessingHandler.java
new file mode 100644
index 000000000..7627c719b
--- /dev/null
+++ b/src/main/java/org/traccar/ProcessingHandler.java
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2024 Anton Tananaev (anton@traccar.org)
+ *
+ * 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 com.google.inject.Injector;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import jakarta.inject.Inject;
+import jakarta.inject.Singleton;
+import org.traccar.database.NotificationManager;
+import org.traccar.handler.BasePositionHandler;
+import org.traccar.handler.ComputedAttributesHandler;
+import org.traccar.handler.CopyAttributesHandler;
+import org.traccar.handler.DatabaseHandler;
+import org.traccar.handler.DistanceHandler;
+import org.traccar.handler.EngineHoursHandler;
+import org.traccar.handler.FilterHandler;
+import org.traccar.handler.GeocoderHandler;
+import org.traccar.handler.GeofenceHandler;
+import org.traccar.handler.GeolocationHandler;
+import org.traccar.handler.HemisphereHandler;
+import org.traccar.handler.MotionHandler;
+import org.traccar.handler.PositionForwardingHandler;
+import org.traccar.handler.SpeedLimitHandler;
+import org.traccar.handler.TimeHandler;
+import org.traccar.handler.events.AlertEventHandler;
+import org.traccar.handler.events.BaseEventHandler;
+import org.traccar.handler.events.BehaviorEventHandler;
+import org.traccar.handler.events.CommandResultEventHandler;
+import org.traccar.handler.events.DriverEventHandler;
+import org.traccar.handler.events.FuelEventHandler;
+import org.traccar.handler.events.GeofenceEventHandler;
+import org.traccar.handler.events.IgnitionEventHandler;
+import org.traccar.handler.events.MaintenanceEventHandler;
+import org.traccar.handler.events.MediaEventHandler;
+import org.traccar.handler.events.MotionEventHandler;
+import org.traccar.handler.events.OverspeedEventHandler;
+import org.traccar.handler.network.AcknowledgementHandler;
+import org.traccar.model.Position;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@Singleton
+@ChannelHandler.Sharable
+public class ProcessingHandler extends ChannelInboundHandlerAdapter {
+
+    private final NotificationManager notificationManager;
+    private final List<BasePositionHandler> positionHandlers;
+    private final List<BaseEventHandler> eventHandlers;
+
+    @Inject
+    public ProcessingHandler(Injector injector, NotificationManager notificationManager) {
+        this.notificationManager = notificationManager;
+
+        positionHandlers = Stream.of(
+                TimeHandler.class,
+                GeolocationHandler.class,
+                HemisphereHandler.class,
+                DistanceHandler.class,
+                FilterHandler.class,
+                GeofenceHandler.class,
+                GeocoderHandler.class,
+                SpeedLimitHandler.class,
+                MotionHandler.class,
+                EngineHoursHandler.class,
+                ComputedAttributesHandler.class,
+                CopyAttributesHandler.class,
+                PositionForwardingHandler.class,
+                DatabaseHandler.class)
+                .map((clazz) -> (BasePositionHandler) injector.getInstance(clazz))
+                .filter(Objects::nonNull)
+                .collect(Collectors.toUnmodifiableList());
+
+        eventHandlers = Stream.of(
+                MediaEventHandler.class,
+                CommandResultEventHandler.class,
+                OverspeedEventHandler.class,
+                BehaviorEventHandler.class,
+                FuelEventHandler.class,
+                MotionEventHandler.class,
+                GeofenceEventHandler.class,
+                AlertEventHandler.class,
+                IgnitionEventHandler.class,
+                MaintenanceEventHandler.class,
+                DriverEventHandler.class)
+                .map((clazz) -> (BaseEventHandler) injector.getInstance(clazz))
+                .filter(Objects::nonNull)
+                .collect(Collectors.toUnmodifiableList());
+    }
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        if (msg instanceof Position) {
+            processPositionHandlers(ctx, (Position) msg);
+        }
+        super.channelRead(ctx, msg);
+    }
+
+    private void processPositionHandlers(ChannelHandlerContext ctx, Position position) {
+        var iterator = positionHandlers.iterator();
+        iterator.next().handlePosition(position, new BasePositionHandler.Callback() {
+            @Override
+            public void processed(Position position) {
+                if (position != null) {
+                    if (iterator.hasNext()) {
+                        iterator.next().handlePosition(position, this);
+                    } else {
+                        processEventHandlers(ctx, position);
+                    }
+                } else {
+                    finishedProcessing(ctx, null);
+                }
+            }
+        });
+    }
+
+    private void processEventHandlers(ChannelHandlerContext ctx, Position position) {
+        eventHandlers.forEach(handler -> handler.analyzePosition(
+                position, (event) -> notificationManager.updateEvents(Map.of(event, position))));
+        finishedProcessing(ctx, position);
+    }
+
+    private void finishedProcessing(ChannelHandlerContext ctx, Position position) {
+        ctx.writeAndFlush(new AcknowledgementHandler.EventHandled(position));
+    }
+
+}