1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
/*
* 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.http;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.json.Json;
import javax.json.JsonObjectBuilder;
import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
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.DataCache;
import org.traccar.database.ObjectConverter;
import org.traccar.helper.Log;
import org.traccar.model.Position;
public class MainServlet extends HttpServlet {
private static final long ASYNC_TIMEOUT = 120000;
private static final String USER_ID = "userId";
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String command = req.getPathInfo();
if (command.equals("/async")) {
async(req.startAsync());
} else if (command.startsWith("/device")) {
device(req, resp);
} else if (command.equals("/login")) {
login(req, resp);
} else if (command.equals("/logout")) {
logout(req, resp);
} else {
resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
}
}
public class AsyncSession {
private static final boolean DEBUG_ASYNC = true;
private static final long SESSION_TIMEOUT = 30;
private static final long REQUEST_TIMEOUT = 30;
private boolean destroyed;
private final long userId;
private final List<Long> devices;
private Timeout sessionTimeout;
private Timeout requestTimeout;
private final Map<Long, Position> positions = new HashMap<Long, Position>();
private AsyncContext activeContext;
private void logEvent(String message) {
if (DEBUG_ASYNC) {
Log.debug("AsyncSession: " + this.hashCode() + " destroyed: " + destroyed + " " + message);
}
}
public AsyncSession(long userId, List<Long> devices) {
logEvent("create userId: " + userId + " devices: " + devices.size());
this.userId = userId;
this.devices = devices;
}
@Override
protected void finalize() throws Throwable {
logEvent("finalize");
}
private final DataCache.DataCacheListener dataListener = new DataCache.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.getDataCache().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 init() {
logEvent("init");
Collection<Position> initialPositions = Context.getDataCache().getInitialState(devices);
for (Position position : initialPositions) {
positions.put(position.getDeviceId(), position);
}
Context.getDataCache().addListener(devices, dataListener);
}
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", ObjectConverter.convert(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 final Map<Long, AsyncSession> asyncSessions = new HashMap<Long, AsyncSession>();
private void async(final AsyncContext context) {
context.setTimeout(60000);
HttpServletRequest req = (HttpServletRequest) context.getRequest();
long userId = (Long) req.getSession().getAttribute(USER_ID);
synchronized (asyncSessions) {
if (!asyncSessions.containsKey(userId)) {
try {
List<Long> devices = Context.getDataManager().getDeviceList(userId);
asyncSessions.put(userId, new AsyncSession(userId, devices));
} catch (SQLException error) {
Log.warning(error);
}
asyncSessions.get(userId).init();
}
asyncSessions.get(userId).request(context);
}
}
private void device(HttpServletRequest req, HttpServletResponse resp) throws IOException {
long userId = (Long) req.getSession().getAttribute(USER_ID);
JsonObjectBuilder result = Json.createObjectBuilder();
try {
result.add("success", true);
result.add("data", Context.getDataManager().getDevices(userId));
} catch(SQLException error) {
result.add("success", false);
result.add("error", error.getMessage());
}
resp.getWriter().println(result.build().toString());
}
private void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
try {
req.getSession().setAttribute(USER_ID,
Context.getDataManager().login(req.getParameter("email"), req.getParameter("password")));
resp.getWriter().println("{ success: true }");
} catch (SQLException e) {
throw new ServletException(e);
}
}
private void logout(HttpServletRequest req, HttpServletResponse resp) throws IOException {
req.getSession().removeAttribute(USER_ID);
resp.getWriter().println("{ success: true }");
}
}
|
