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  5. <title>Roller xref</title>
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    9. 

  9. <div id="overview"><a href="../../../../../apidocs/org/apache/log4j/varia/Roller.html">View Javadoc</a></div><pre>
    10. 

  10. 

  11. <a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
    12. 

  12. <a name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
    13. 

  13. <a name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
    14. 

  14. <a name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
    15. 

  15. <a name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
    16. 

  16. <a name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
    17. 

  17. <a name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
    18. 

  18. <a name="8" href="#8">8</a>   <em class="jxr_comment"> * </em>
    19. 

  19. <a name="9" href="#9">9</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
    20. 

  20. <a name="10" href="#10">10</a>  <em class="jxr_comment"> * </em>
    21. 

  21. <a name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
    22. 

  22. <a name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
    23. 

  23. <a name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
    24. 

  24. <a name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
    25. 

  25. <a name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
    26. 

  26. <a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
    27. 

  27. <a name="17" href="#17">17</a>  
    28. 

  28. <a name="18" href="#18">18</a>  <strong class="jxr_keyword">package</strong> org.apache.log4j.varia;
    29. 

  29. <a name="19" href="#19">19</a>  
    30. 

  30. <a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
    31. 

  31. <a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.apache.log4j.BasicConfigurator;
    32. 

  32. <a name="22" href="#22">22</a>  
    33. 

  33. <a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
    34. 

  34. <a name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.io.DataInputStream;
    35. 

  35. <a name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.io.DataOutputStream;
    36. 

  36. <a name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.net.Socket;
    37. 

  37. <a name="27" href="#27">27</a>  
    38. 

  38. <a name="28" href="#28">28</a>  <em class="jxr_javadoccomment">/**</em>
    39. 

  39. <a name="29" href="#29">29</a>  <em class="jxr_javadoccomment">   A simple application to send roll over messages to a potentially</em>
    40. 

  40. <a name="30" href="#30">30</a>  <em class="jxr_javadoccomment">   remote {@link ExternallyRolledFileAppender}. </em>
    41. 

  41. <a name="31" href="#31">31</a>  
    42. 

  42. <a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">   &lt;p&gt;It takes two arguments, the &lt;code&gt;host_name&lt;/code&gt; and</em>
    43. 

  43. <a name="33" href="#33">33</a>  <em class="jxr_javadoccomment">   &lt;code&gt;port_number&lt;/code&gt; where the</em>
    44. 

  44. <a name="34" href="#34">34</a>  <em class="jxr_javadoccomment">   &lt;code&gt;ExternallyRolledFileAppender&lt;/code&gt; is listening.</em>
    45. 

  45. <a name="35" href="#35">35</a>  <em class="jxr_javadoccomment">   </em>
    46. 

  46. <a name="36" href="#36">36</a>  
    47. 

  47. <a name="37" href="#37">37</a>  <em class="jxr_javadoccomment">   @author Ceki G&amp;uuml;lc&amp;uuml;</em>
    48. 

  48. <a name="38" href="#38">38</a>  <em class="jxr_javadoccomment">   @since version 0.9.0 */</em>
    49. 

  49. <a name="39" href="#39">39</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/log4j/varia/Roller.html">Roller</a> {
    50. 

  50. <a name="40" href="#40">40</a>  
    51. 

  51. <a name="41" href="#41">41</a>    <strong class="jxr_keyword">static</strong> <a href="../../../../org/apache/log4j/Logger.html">Logger</a> cat = Logger.getLogger(Roller.<strong class="jxr_keyword">class</strong>);
    52. 

  52. <a name="42" href="#42">42</a>    
    53. 

  53. <a name="43" href="#43">43</a>  
    54. 

  54. <a name="44" href="#44">44</a>    <strong class="jxr_keyword">static</strong> String host;
    55. 

  55. <a name="45" href="#45">45</a>    <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> port;
    56. 

  56. <a name="46" href="#46">46</a>  
    57. 

  57. <a name="47" href="#47">47</a>    <em class="jxr_comment">// Static class.</em>
    58. 

  58. <a name="48" href="#48">48</a>    <a href="../../../../org/apache/log4j/varia/Roller.html">Roller</a>() {
    59. 

  59. <a name="49" href="#49">49</a>    }
    60. 

  60. <a name="50" href="#50">50</a>  
    61. 

  61. <a name="51" href="#51">51</a>    <em class="jxr_javadoccomment">/**</em>
    62. 

  62. <a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">     Send a "RollOver" message to</em>
    63. 

  63. <a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">     &lt;code&gt;ExternallyRolledFileAppender&lt;/code&gt; on &lt;code&gt;host&lt;/code&gt;</em>
    64. 

  64. <a name="54" href="#54">54</a>  <em class="jxr_javadoccomment">     and &lt;code&gt;port&lt;/code&gt;.</em>
    65. 

  65. <a name="55" href="#55">55</a>  
    66. 

  66. <a name="56" href="#56">56</a>  <em class="jxr_javadoccomment">   */</em>
    67. 

  67. <a name="57" href="#57">57</a>    <strong class="jxr_keyword">public</strong> 
    68. 

  68. <a name="58" href="#58">58</a>    <strong class="jxr_keyword">static</strong> 
    69. 

  69. <a name="59" href="#59">59</a>    <strong class="jxr_keyword">void</strong> main(String argv[]) {
    70. 

  70. <a name="60" href="#60">60</a>  
    71. 

  71. <a name="61" href="#61">61</a>      BasicConfigurator.configure();
    72. 

  72. <a name="62" href="#62">62</a>  
    73. 

  73. <a name="63" href="#63">63</a>      <strong class="jxr_keyword">if</strong>(argv.length == 2) 
    74. 

  74. <a name="64" href="#64">64</a>        init(argv[0], argv[1]);
    75. 

  75. <a name="65" href="#65">65</a>      <strong class="jxr_keyword">else</strong> 
    76. 

  76. <a name="66" href="#66">66</a>        usage(<span class="jxr_string">"Wrong number of arguments."</span>);
    77. 

  77. <a name="67" href="#67">67</a>      
    78. 

  78. <a name="68" href="#68">68</a>      roll();
    79. 

  79. <a name="69" href="#69">69</a>    }
    80. 

  80. <a name="70" href="#70">70</a>  
    81. 

  81. <a name="71" href="#71">71</a>    <strong class="jxr_keyword">static</strong>
    82. 

  82. <a name="72" href="#72">72</a>    <strong class="jxr_keyword">void</strong> usage(String msg) {
    83. 

  83. <a name="73" href="#73">73</a>      System.err.println(msg);
    84. 

  84. <a name="74" href="#74">74</a>      System.err.println( <span class="jxr_string">"Usage: java "</span> + Roller.<strong class="jxr_keyword">class</strong>.getName() +
    85. 

  85. <a name="75" href="#75">75</a>  			<span class="jxr_string">"host_name port_number"</span>);
    86. 

  86. <a name="76" href="#76">76</a>      System.exit(1);
    87. 

  87. <a name="77" href="#77">77</a>    }
    88. 

  88. <a name="78" href="#78">78</a>  
    89. 

  89. <a name="79" href="#79">79</a>    <strong class="jxr_keyword">static</strong> 
    90. 

  90. <a name="80" href="#80">80</a>    <strong class="jxr_keyword">void</strong> init(String hostArg, String portArg) {
    91. 

  91. <a name="81" href="#81">81</a>      host = hostArg;
    92. 

  92. <a name="82" href="#82">82</a>      <strong class="jxr_keyword">try</strong> {
    93. 

  93. <a name="83" href="#83">83</a>        port =  Integer.parseInt(portArg);
    94. 

  94. <a name="84" href="#84">84</a>      }
    95. 

  95. <a name="85" href="#85">85</a>      <strong class="jxr_keyword">catch</strong>(java.lang.NumberFormatException e) {
    96. 

  96. <a name="86" href="#86">86</a>        usage(<span class="jxr_string">"Second argument "</span>+portArg+<span class="jxr_string">" is not a valid integer."</span>);
    97. 

  97. <a name="87" href="#87">87</a>      }
    98. 

  98. <a name="88" href="#88">88</a>    }
    99. 

  99. <a name="89" href="#89">89</a>  
    100. 

  100. <a name="90" href="#90">90</a>    <strong class="jxr_keyword">static</strong>
    101. 

  101. <a name="91" href="#91">91</a>    <strong class="jxr_keyword">void</strong> roll() {
    102. 

  102. <a name="92" href="#92">92</a>      <strong class="jxr_keyword">try</strong> {
    103. 

  103. <a name="93" href="#93">93</a>        Socket socket = <strong class="jxr_keyword">new</strong> Socket(host, port);
    104. 

  104. <a name="94" href="#94">94</a>        DataOutputStream dos = <strong class="jxr_keyword">new</strong> DataOutputStream(socket.getOutputStream());
    105. 

  105. <a name="95" href="#95">95</a>        DataInputStream dis = <strong class="jxr_keyword">new</strong> DataInputStream(socket.getInputStream());
    106. 

  106. <a name="96" href="#96">96</a>        dos.writeUTF(ExternallyRolledFileAppender.ROLL_OVER);
    107. 

  107. <a name="97" href="#97">97</a>        String rc = dis.readUTF();
    108. 

  108. <a name="98" href="#98">98</a>        <strong class="jxr_keyword">if</strong>(ExternallyRolledFileAppender.OK.equals(rc)) {
    109. 

  109. <a name="99" href="#99">99</a>  	cat.info(<span class="jxr_string">"Roll over signal acknowledged by remote appender."</span>);
    110. 

  110. <a name="100" href="#100">100</a>       } <strong class="jxr_keyword">else</strong> {
    111. 

  111. <a name="101" href="#101">101</a> 	cat.warn(<span class="jxr_string">"Unexpected return code "</span>+rc+<span class="jxr_string">" from remote entity."</span>);
    112. 

  112. <a name="102" href="#102">102</a> 	System.exit(2);
    113. 

  113. <a name="103" href="#103">103</a>       }
    114. 

  114. <a name="104" href="#104">104</a>     } <strong class="jxr_keyword">catch</strong>(IOException e) {
    115. 

  115. <a name="105" href="#105">105</a>       cat.error(<span class="jxr_string">"Could not send roll signal on host "</span>+host+<span class="jxr_string">" port "</span>+port+<span class="jxr_string">" ."</span>,
    116. 

  116. <a name="106" href="#106">106</a> 		e);
    117. 

  117. <a name="107" href="#107">107</a>       System.exit(2);
    118. 

  118. <a name="108" href="#108">108</a>     }
    119. 

  119. <a name="109" href="#109">109</a>     System.exit(0);
    120. 

  120. <a name="110" href="#110">110</a>   }
    121. 

  121. <a name="111" href="#111">111</a> }
    122. 

  122. </pre>
    123. 

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    124. 

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  125. 

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