thoerup/marketstats/ShowStats.java

package dk.thoerup.marketstats;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Locale;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.spy.memcached.MemcachedClient;

import com.gc.android.market.api.MarketSession;
import com.gc.android.market.api.model.Market.AppsRequest;
import com.gc.android.market.api.model.Market.CommentsRequest;


@WebServlet(urlPatterns={"/ShowStats"})
public class ShowStats extends HttpServlet {
        private static final long serialVersionUID = 1L;

        static final int MAXCOMMENTS = 30;
        static final int APP_TIMEOUT = 30*60;
        static final int COMMENT_TIMEOUT = APP_TIMEOUT * 4;
        
        static final Logger log = Logger.getLogger(ShowStats.class.getName());

        String login;
        String password;
        
        MemcachedClient memcache = null;


        @Override
        public void init() throws ServletException {
                super.init();

                login = getServletContext().getInitParameter("login");
                password = getServletContext().getInitParameter("password");
                
                try {
                        memcache = new MemcachedClient(new InetSocketAddress("localhost", 11211));
                } catch (IOException e) {
                        throw new ServletException(e);
                }
        }

        @Override
        public void destroy() {
                super.destroy();
                
                memcache.shutdown(3, TimeUnit.SECONDS);
                memcache = null;
        }

        protected AppBean lookupApp(String query) throws IOException {
                

                String key = "marketstats:" + query.replace(' ', '_');
                //String response = (String) memcache.get(key);
                AppBean response = (AppBean) memcache.get(key);

                if (response == null) {
                        response = lookupAppWorker(query);
                        if (response != null) {
                                memcache.set(key, APP_TIMEOUT, response);
                        }
                } 
                return response;
        }

        protected AppBean lookupAppWorker(String query) {

                MarketSession session = new MarketSession();
                session.login(login,password);


                AppsRequest appsRequest = AppsRequest.newBuilder()
                .setQuery(query)
                .setStartIndex(0)
                .setEntriesCount(1)
                .setWithExtendedInfo(true)
                .build();
                
                AppsCallback appsCb = new AppsCallback();
                session.append(appsRequest, appsCb);
                session.flush();
                
                return appsCb.getResult().get(0);
        }       
        
        CommentsRequest buildCommentRequest(String appId, int start, int count) {
                CommentsRequest commentsRequest = CommentsRequest.newBuilder()
                .setAppId(appId)
                .setStartIndex(start)
                .setEntriesCount(count)
                .build();
                
                return commentsRequest;
        }
        
        private ArrayList<CommentBean> loadComments(String appId) {
                
                ArrayList<CommentBean> commentBeans = new ArrayList<CommentBean>();
                MarketSession session = new MarketSession();
                session.login(login,password);
                
                CommentCallback commentsCb = new CommentCallback();
                commentsCb.setList( commentBeans ); 

                session.setLocale( Locale.ROOT );
                
                
                int start = 0;
                do {
                        int count = 10;
                        if (start > 0)                          
                                count = Math.min(10, commentsCb.getEntryCount() );
                        
                        //log.warning("count=" + count + " start=" + start + " entryCount=" + commentsCb.getEntryCount() );
                        for (int i=0; i<5;i++) {
                                CommentsRequest commentsRequest = buildCommentRequest(appId,start,count);                       
                                session.append(commentsRequest, commentsCb);
                                start +=10;
                        }
                        
                        session.flush();
                                                
                        if (start >= MAXCOMMENTS)
                                break; //emergency brake
                        
                } while ( start < commentsCb.getEntryCount() );
                
                return commentBeans;
        }

        
        @SuppressWarnings("unchecked")
        public ArrayList<CommentBean> getComments(AppBean app) {                
                String key = "marketstats:comments:" + app.getId();
                ArrayList<CommentBean>  comments =  (ArrayList<CommentBean>) memcache.get(key);

                if (comments == null) {
                        comments = loadComments(app.getId());
                        memcache.set(key, COMMENT_TIMEOUT, comments); 
                } 
                return comments;
        }

        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                String query = "pname:" + request.getParameter("app");
                
                AppBean app = lookupApp(query);
                if (app != null) {
                        request.setAttribute("app", app);
                
                        ArrayList<CommentBean> comments = getComments(app);
                        request.setAttribute("comments", comments);
                
                        getServletContext().getRequestDispatcher("/statsview.jsp").forward(request, response);
                } else {
                        response.getWriter().print("No app found with query=" + query);
                }
        }

}
1	package dk.thoerup.marketstats;
2
3	import java.io.IOException;
4	import java.net.InetSocketAddress;
5	import java.util.ArrayList;
6	import java.util.Locale;
7	import java.util.concurrent.TimeUnit;
8	import java.util.logging.Logger;
9
10	import javax.servlet.ServletException;
11	import javax.servlet.annotation.WebServlet;
12	import javax.servlet.http.HttpServlet;
13	import javax.servlet.http.HttpServletRequest;
14	import javax.servlet.http.HttpServletResponse;
15
16	import net.spy.memcached.MemcachedClient;
17
18	import com.gc.android.market.api.MarketSession;
19	import com.gc.android.market.api.model.Market.AppsRequest;
20	import com.gc.android.market.api.model.Market.CommentsRequest;
21
22
23	@WebServlet(urlPatterns={"/ShowStats"})
24	public class ShowStats extends HttpServlet {
25	private static final long serialVersionUID = 1L;
26
27	static final int MAXCOMMENTS = 30;
28	static final int APP_TIMEOUT = 30*60;
29	static final int COMMENT_TIMEOUT = APP_TIMEOUT * 4;
30
31	static final Logger log = Logger.getLogger(ShowStats.class.getName());
32
33	String login;
34	String password;
35
36	MemcachedClient memcache = null;
37
38
39	@Override
40	public void init() throws ServletException {
41	super.init();
42
43	login = getServletContext().getInitParameter("login");
44	password = getServletContext().getInitParameter("password");
45
46	try {
47	memcache = new MemcachedClient(new InetSocketAddress("localhost", 11211));
48	} catch (IOException e) {
49	throw new ServletException(e);
50	}
51	}
52
53	@Override
54	public void destroy() {
55	super.destroy();
56
57	memcache.shutdown(3, TimeUnit.SECONDS);
58	memcache = null;
59	}
60
61	protected AppBean lookupApp(String query) throws IOException {
62
63
64	String key = "marketstats:" + query.replace(' ', '_');
65	//String response = (String) memcache.get(key);
66	AppBean response = (AppBean) memcache.get(key);
67
68	if (response == null) {
69	response = lookupAppWorker(query);
70	if (response != null) {
71	memcache.set(key, APP_TIMEOUT, response);
72	}
73	}
74	return response;
75	}
76
77	protected AppBean lookupAppWorker(String query) {
78
79	MarketSession session = new MarketSession();
80	session.login(login,password);
81
82
83	AppsRequest appsRequest = AppsRequest.newBuilder()
84	.setQuery(query)
85	.setStartIndex(0)
86	.setEntriesCount(1)
87	.setWithExtendedInfo(true)
88	.build();
89
90	AppsCallback appsCb = new AppsCallback();
91	session.append(appsRequest, appsCb);
92	session.flush();
93
94	return appsCb.getResult().get(0);
95	}
96
97	CommentsRequest buildCommentRequest(String appId, int start, int count) {
98	CommentsRequest commentsRequest = CommentsRequest.newBuilder()
99	.setAppId(appId)
100	.setStartIndex(start)
101	.setEntriesCount(count)
102	.build();
103
104	return commentsRequest;
105	}
106
107	private ArrayList<CommentBean> loadComments(String appId) {
108
109	ArrayList<CommentBean> commentBeans = new ArrayList<CommentBean>();
110	MarketSession session = new MarketSession();
111	session.login(login,password);
112
113	CommentCallback commentsCb = new CommentCallback();
114	commentsCb.setList( commentBeans );
115
116	session.setLocale( Locale.ROOT );
117
118
119
120	int start = 0;
121	do {
122	int count = 10;
123	if (start > 0)
124	count = Math.min(10, commentsCb.getEntryCount() );
125
126	//log.warning("count=" + count + " start=" + start + " entryCount=" + commentsCb.getEntryCount() );
127	for (int i=0; i<5;i++) {
128	CommentsRequest commentsRequest = buildCommentRequest(appId,start,count);
129	session.append(commentsRequest, commentsCb);
130	start +=10;
131	}
132
133	session.flush();
134
135	if (start >= MAXCOMMENTS)
136	break; //emergency brake
137
138	} while ( start < commentsCb.getEntryCount() );
139
140	return commentBeans;
141	}
142
143
144
145	@SuppressWarnings("unchecked")
146	public ArrayList<CommentBean> getComments(AppBean app) {
147	String key = "marketstats:comments:" + app.getId();
148	ArrayList<CommentBean> comments = (ArrayList<CommentBean>) memcache.get(key);
149
150	if (comments == null) {
151	comments = loadComments(app.getId());
152	memcache.set(key, COMMENT_TIMEOUT, comments);
153	}
154	return comments;
155	}
156
157	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
158	String query = "pname:" + request.getParameter("app");
159
160	AppBean app = lookupApp(query);
161	if (app != null) {
162	request.setAttribute("app", app);
163
164	ArrayList<CommentBean> comments = getComments(app);
165	request.setAttribute("comments", comments);
166
167	getServletContext().getRequestDispatcher("/statsview.jsp").forward(request, response);
168	} else {
169	response.getWriter().print("No app found with query=" + query);
170	}
171	}
172
173	}