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-rw-r--r--src/org/traccar/web/AsyncServlet.java211
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diff --git a/src/org/traccar/web/AsyncServlet.java b/src/org/traccar/web/AsyncServlet.java
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+/*
+ * Copyright 2015 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.web;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import javax.json.Json;
+import javax.json.JsonObjectBuilder;
+import javax.servlet.AsyncContext;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.jboss.netty.util.Timeout;
+import org.jboss.netty.util.TimerTask;
+import org.traccar.Context;
+import org.traccar.GlobalTimer;
+import org.traccar.database.ConnectionManager;
+import org.traccar.helper.Log;
+import org.traccar.model.Position;
+
+public class AsyncServlet extends BaseServlet {
+
+ private static final long ASYNC_TIMEOUT = 120000;
+
+ @Override
+ protected boolean handle(String command, HttpServletRequest req, HttpServletResponse resp) throws Exception {
+ async(req.startAsync(), getUserId(req));
+ return true;
+ }
+
+ public class AsyncSession {
+
+ private static final boolean DEBUG_ASYNC = false;
+
+ private static final long SESSION_TIMEOUT = 30;
+ private static final long REQUEST_TIMEOUT = 20;
+
+ private boolean destroyed;
+ private final long userId;
+ private final Set<Long> devices = new HashSet<>();
+ private Timeout sessionTimeout;
+ private Timeout requestTimeout;
+ private final Map<Long, Position> positions = new HashMap<>();
+ private AsyncContext activeContext;
+
+ private void logEvent(String message) {
+ if (DEBUG_ASYNC) {
+ Log.debug("AsyncSession: " + this.hashCode() + " destroyed: " + destroyed + " " + message);
+ }
+ }
+
+ public AsyncSession(long userId, Collection<Long> devices) {
+ logEvent("create userId: " + userId + " devices: " + devices.size());
+ this.userId = userId;
+ this.devices.addAll(devices);
+
+ Collection<Position> initialPositions = Context.getConnectionManager().getInitialState(devices);
+ for (Position position : initialPositions) {
+ positions.put(position.getDeviceId(), position);
+ }
+
+ Context.getConnectionManager().addListener(devices, dataListener);
+ }
+
+ public boolean hasDevice(long deviceId) {
+ return devices.contains(deviceId);
+ }
+
+ private final ConnectionManager.DataCacheListener dataListener = new ConnectionManager.DataCacheListener() {
+ @Override
+ public void onUpdate(Position position) {
+ synchronized (AsyncSession.this) {
+ logEvent("onUpdate deviceId: " + position.getDeviceId());
+ if (!destroyed) {
+ if (requestTimeout != null) {
+ requestTimeout.cancel();
+ requestTimeout = null;
+ }
+ positions.put(position.getDeviceId(), position);
+ if (activeContext != null) {
+ response();
+ }
+ }
+ }
+ }
+ };
+
+ private final TimerTask sessionTimer = new TimerTask() {
+ @Override
+ public void run(Timeout tmt) throws Exception {
+ synchronized (AsyncSession.this) {
+ logEvent("sessionTimeout");
+ Context.getConnectionManager().removeListener(devices, dataListener);
+ synchronized (asyncSessions) {
+ asyncSessions.remove(userId);
+ }
+ destroyed = true;
+ }
+ }
+ };
+
+ private final TimerTask requestTimer = new TimerTask() {
+ @Override
+ public void run(Timeout tmt) throws Exception {
+ synchronized (AsyncSession.this) {
+ logEvent("requestTimeout");
+ if (!destroyed) {
+ if (activeContext != null) {
+ response();
+ }
+ }
+ }
+ }
+ };
+
+ public synchronized void request(AsyncContext context) {
+ logEvent("request context: " + context.hashCode());
+ if (!destroyed) {
+ activeContext = context;
+ if (sessionTimeout != null) {
+ sessionTimeout.cancel();
+ sessionTimeout = null;
+ }
+
+ if (!positions.isEmpty()) {
+ response();
+ } else {
+ requestTimeout = GlobalTimer.getTimer().newTimeout(
+ requestTimer, REQUEST_TIMEOUT, TimeUnit.SECONDS);
+ }
+ }
+ }
+
+ private synchronized void response() {
+ logEvent("response context: " + activeContext.hashCode());
+ if (!destroyed) {
+ ServletResponse response = activeContext.getResponse();
+
+ JsonObjectBuilder result = Json.createObjectBuilder();
+ result.add("success", true);
+ result.add("data", JsonConverter.arrayToJson(positions.values()));
+ positions.clear();
+
+ try {
+ response.getWriter().println(result.build().toString());
+ } catch (IOException error) {
+ Log.warning(error);
+ }
+
+ activeContext.complete();
+ activeContext = null;
+
+ sessionTimeout = GlobalTimer.getTimer().newTimeout(
+ sessionTimer, SESSION_TIMEOUT, TimeUnit.SECONDS);
+ }
+ }
+
+ }
+
+ private static final Map<Long, AsyncSession> asyncSessions = new HashMap<>();
+
+ public static void sessionRefreshUser(long userId) {
+ asyncSessions.remove(userId);
+ }
+
+ public static void sessionRefreshDevice(long deviceId) {
+ Iterator<Entry<Long, AsyncSession>> iterator = asyncSessions.entrySet().iterator();
+ while (iterator.hasNext()) {
+ if (iterator.next().getValue().hasDevice(deviceId)) {
+ iterator.remove();
+ }
+ }
+ }
+
+ private void async(final AsyncContext context, long userId) {
+
+ context.setTimeout(ASYNC_TIMEOUT);
+ HttpServletRequest req = (HttpServletRequest) context.getRequest();
+
+ synchronized (asyncSessions) {
+
+ if (Boolean.valueOf(req.getParameter("first")) || !asyncSessions.containsKey(userId)) {
+ Collection<Long> devices = Context.getPermissionsManager().allowedDevices(userId);
+ asyncSessions.put(userId, new AsyncSession(userId, devices));
+ }
+
+ asyncSessions.get(userId).request(context);
+ }
+ }
+
+}