| <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="de"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><link rel="stylesheet" href="../jacoco-resources/report.css" type="text/css"/><link rel="shortcut icon" href="../jacoco-resources/report.gif" type="image/gif"/><title>GenerateUniqueId.java</title><link rel="stylesheet" href="../jacoco-resources/prettify.css" type="text/css"/><script type="text/javascript" src="../jacoco-resources/prettify.js"></script></head><body onload="window['PR_TAB_WIDTH']=4;prettyPrint()"><div class="breadcrumb" id="breadcrumb"><span class="info"><a href="../jacoco-sessions.html" class="el_session">Sessions</a></span><a href="../index.html" class="el_report">Apache Turbine</a> > <a href="index.source.html" class="el_package">org.apache.turbine.util</a> > <span class="el_source">GenerateUniqueId.java</span></div><h1>GenerateUniqueId.java</h1><pre class="source lang-java linenums">package org.apache.turbine.util; |
| |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| |
| import java.util.Random; |
| |
| /** |
| * This class generates a unique 10+ character id. This is good for |
| * authenticating users or tracking users around. |
| * |
| * <p>This code was borrowed from Apache |
| * JServ.JServServletManager.java. It is what Apache JServ uses to |
| * generate session ids for users. Unfortunately, it was not included |
| * in Apache JServ as a class, so I had to create one here in order to |
| * use it. |
| * |
| * @author <a href="mailto:jon@clearink.com">Jon S. Stevens</a> |
| * @author <a href="mailto:neeme@one.lv">Neeme Praks</a> |
| * @version $Id$ |
| */ |
| <span class="nc" id="L40">public class GenerateUniqueId</span> |
| { |
| /* |
| * Create a suitable string for session identification. Use |
| * synchronized count and time to ensure uniqueness. Use random |
| * string to ensure the timestamp cannot be guessed by programmed |
| * attack. |
| * |
| * Format of id is <6 chars random><3 chars time><1+ char count> |
| */ |
| <span class="nc" id="L50"> static private int session_count = 0;</span> |
| <span class="nc" id="L51"> static private long lastTimeVal = 0;</span> |
| <span class="nc" id="L52"> static private Random randomSource = new java.util.Random();</span> |
| |
| // MAX_RADIX is 36 |
| |
| /** |
| * We want to have a random string with a length of 6 characters. |
| * Since we encode it BASE 36, we've to modulo it with the |
| * following value: |
| */ |
| public final static long maxRandomLen = 2176782336L; // 36 ** 6 |
| |
| /** |
| * The session identifier must be unique within the typical |
| * lifespan of a Session; the value can roll over after that. 3 |
| * characters: (this means a roll over after over a day, which is |
| * much larger than a typical lifespan) |
| */ |
| public final static long maxSessionLifespanTics = 46656; // 36 ** 3 |
| |
| /** |
| * Millisecons between different tics. So this means that the |
| * 3-character time string has a new value every 2 seconds: |
| */ |
| public final static long ticDifference = 2000; |
| |
| /** |
| * Get the unique id. |
| * |
| * <p>NOTE: This must work together with |
| * get_jserv_session_balance() in jserv_balance.c |
| * |
| * @return A String with the new unique id. |
| */ |
| static synchronized public String getIdentifier() |
| { |
| <span class="nc" id="L87"> StringBuilder sessionId = new StringBuilder();</span> |
| |
| // Random value. |
| <span class="nc" id="L90"> long n = randomSource.nextLong();</span> |
| <span class="nc bnc" id="L91" title="All 2 branches missed."> if (n < 0)</span> |
| { |
| <span class="nc" id="L93"> n = -n;</span> |
| } |
| <span class="nc" id="L95"> n %= maxRandomLen;</span> |
| |
| // Add maxLen to pad the leading characters with '0'; remove |
| // first digit with substring. |
| <span class="nc" id="L99"> n += maxRandomLen;</span> |
| <span class="nc" id="L100"> sessionId.append(Long.toString(n, Character.MAX_RADIX)</span> |
| <span class="nc" id="L101"> .substring(1));</span> |
| |
| <span class="nc" id="L103"> long timeVal = (System.currentTimeMillis() / ticDifference);</span> |
| |
| // Cut. |
| <span class="nc" id="L106"> timeVal %= maxSessionLifespanTics;</span> |
| |
| // Padding, see above. |
| <span class="nc" id="L109"> timeVal += maxSessionLifespanTics;</span> |
| |
| <span class="nc" id="L111"> sessionId.append(Long.toString(timeVal, Character.MAX_RADIX)</span> |
| <span class="nc" id="L112"> .substring(1));</span> |
| |
| /* |
| * Make the string unique: append the session count since last |
| * time flip. |
| */ |
| |
| // Count sessions only within tics. So the 'real' session |
| // count isn't exposed to the public. |
| <span class="nc bnc" id="L121" title="All 2 branches missed."> if (lastTimeVal != timeVal)</span> |
| { |
| <span class="nc" id="L123"> lastTimeVal = timeVal;</span> |
| <span class="nc" id="L124"> session_count = 0;</span> |
| } |
| <span class="nc" id="L126"> sessionId.append(Long.toString(++session_count,</span> |
| Character.MAX_RADIX)); |
| |
| <span class="nc" id="L129"> return sessionId.toString();</span> |
| } |
| |
| /** |
| * Get the unique id. |
| * |
| * @param jsIdent A String. |
| * @return A String with the new unique id. |
| */ |
| synchronized public String getIdentifier(String jsIdent) |
| { |
| <span class="nc bnc" id="L140" title="All 4 branches missed."> if (jsIdent != null && jsIdent.length() > 0)</span> |
| { |
| <span class="nc" id="L142"> return getIdentifier() + "." + jsIdent;</span> |
| } |
| <span class="nc" id="L144"> return getIdentifier();</span> |
| } |
| |
| /** |
| * Simple test of the functionality. |
| * |
| * @param args A String[] with the command line arguments. |
| */ |
| public static void main(String[] args) |
| { |
| <span class="nc" id="L154"> System.out.println(GenerateUniqueId.getIdentifier());</span> |
| <span class="nc" id="L155"> System.out.println(GenerateUniqueId.getIdentifier());</span> |
| <span class="nc" id="L156"> System.out.println(GenerateUniqueId.getIdentifier());</span> |
| <span class="nc" id="L157"> System.out.println(GenerateUniqueId.getIdentifier());</span> |
| <span class="nc" id="L158"> }</span> |
| } |
| </pre><div class="footer"><span class="right">Created with <a href="http://www.jacoco.org/jacoco">JaCoCo</a> 0.8.12.202403310830</span></div></body></html> |
