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authorAnton Tananaev <anton.tananaev@gmail.com>2015-04-25 20:51:38 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2015-04-25 20:51:38 +1200
commitb10cebd692b610a13ea27b6150a79726de59f40e (patch)
tree31919802ddae807fa4887446addc9eb98d5fbe50 /src/org/traccar/http
parent67dc1c43932bffaf9df2c9ec201cff879d0226d9 (diff)
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Implement async position update
Diffstat (limited to 'src/org/traccar/http')
-rw-r--r--src/org/traccar/http/MainServlet.java177
1 files changed, 163 insertions, 14 deletions
diff --git a/src/org/traccar/http/MainServlet.java b/src/org/traccar/http/MainServlet.java
index 7483b22b4..655b47312 100644
--- a/src/org/traccar/http/MainServlet.java
+++ b/src/org/traccar/http/MainServlet.java
@@ -17,6 +17,11 @@ 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;
@@ -25,13 +30,21 @@ 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 String USER_ID = "userId";
+ 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 {
@@ -50,25 +63,161 @@ public class MainServlet extends HttpServlet {
}
}
- private void async(final AsyncContext context) {
- context.start(new Runnable() {
+ 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() {
+ 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 {
- Thread.sleep(5000); // DELME
+ response.getWriter().println(result.build().toString());
+ } catch (IOException error) {
+ Log.warning(error);
+ }
- ServletResponse response = context.getResponse();
- response.getWriter().println("{ success: true, data: ["+
- "{ id: 1, device_id: 1, time: \"2012-04-23T18:25:43.511Z\", latitude: 60, longitude: 30, speed: 0, course: 0 }," +
- "{ id: 2, device_id: 2, time: \"2012-04-23T19:25:43.511Z\", latitude: 61, longitude: 31, speed: 0, course: 0 }" +
- "] }");
- context.complete();
+ activeContext.complete();
+ activeContext = null;
- } catch (Exception ex) {
- Log.warning(ex);
+ 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 {