source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/web/commands/CMDloadSessionsFromClickstream.java @ 51

package de.ugoe.cs.eventbench.web.commands;

import java.io.File;
import java.io.FileReader;
import java.security.InvalidParameterException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import de.ugoe.cs.eventbench.data.Event;
import de.ugoe.cs.eventbench.web.data.WebEvent;
import de.ugoe.cs.util.console.Command;
import de.ugoe.cs.util.console.Console;

public class CMDloadSessionsFromClickstream implements Command {

        @Override
        public void run(List<Object> parameters) {
                // TODO Auto-generated method stub
                if( parameters.size() < 2 ) {
                        throw new InvalidParameterException();
                }
                String source = (String) parameters.get(0);
                
                // TODO needs to be variable
                long timeout = 3600000; // 1 hour session-timeout
                
                try { // TODO dummy try/catch block
                        File f = new File(source);
                        FileReader reader = new FileReader(f);
                        char[] buffer = new char[(int) f.length()];
                        reader.read(buffer);
                        reader.close();
                        String[] lines = (new String(buffer)).split("\n");
                        
                        Map<String, List<Integer>> cookieSessionMap = new HashMap<String, List<Integer>>();
                        int lastId = -1;
                        
                        List<List<WebEvent>> sessions = new ArrayList<List<WebEvent>>();
                        
                        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        
                        for( int i=0; i<lines.length ; i++ ) {
                                String[] values = lines[i].split(" ");
                                
                                // use cookie as session identifier
                                int cookieStart = values[0].lastIndexOf('.');
                                String cookie = values[0].substring(cookieStart+1);
                                String dateString = values[1].substring(1)+" "+values[2].substring(0, values[2].length()-1);
                                long timestamp = dateFormat.parse(dateString).getTime();
                                String uri = values[3];
                                
                                List<Integer> sessionIds = cookieSessionMap.get(cookie);
                                if( sessionIds==null ) {
                                        sessionIds = new ArrayList<Integer>();
                                        // start new session
                                        sessionIds.add(++lastId);
                                        cookieSessionMap.put(cookie, sessionIds);
                                        sessions.add(new LinkedList<WebEvent>());
                                } 
                                Integer lastSessionIndex = sessionIds.get(sessionIds.size()-1);
                                List<WebEvent> lastSession = sessions.get(lastSessionIndex);
                                long lastEventTime = timestamp;
                                if( !lastSession.isEmpty() ) {
                                        lastEventTime = lastSession.get(lastSession.size()-1).getTimestamp();
                                }
                                if( timestamp-lastEventTime>timeout ) {
                                        sessionIds.add(++lastId);
                                        List<WebEvent> newSession = new LinkedList<WebEvent>();
                                        newSession.add(new WebEvent(uri, timestamp));
                                        sessions.add(newSession);
                                } else {
                                        lastSession.add(new WebEvent(uri, timestamp));
                                }
                        } 
                        Console.traceln(sessions.toString());
                } catch(Exception e) {
                        e.printStackTrace();
                }
                
        }

        @Override
        public void help() {
                // TODO Auto-generated method stub
                
        }

}