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9<div id="overview"><a href="../../../../../apidocs/org/apache/log4j/varia/Roller.html">View Javadoc</a></div><pre>
10
11<a name="1" href="#1">1</a> <em class="jxr_comment">/*</em>
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<a name="3" href="#3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em>
14<a name="4" href="#4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
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<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<a name="7" href="#7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em>
18<a name="8" href="#8">8</a> <em class="jxr_comment"> * </em>
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<a name="10" href="#10">10</a> <em class="jxr_comment"> * </em>
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<a name="12" href="#12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
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<a name="14" href="#14">14</a> <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
25<a name="15" href="#15">15</a> <em class="jxr_comment"> * limitations under the License.</em>
26<a name="16" href="#16">16</a> <em class="jxr_comment"> */</em>
27<a name="17" href="#17">17</a>
28<a name="18" href="#18">18</a> <strong class="jxr_keyword">package</strong> org.apache.log4j.varia;
29<a name="19" href="#19">19</a>
30<a name="20" href="#20">20</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
31<a name="21" href="#21">21</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.BasicConfigurator;
32<a name="22" href="#22">22</a>
33<a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.io.IOException;
34<a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.io.DataInputStream;
35<a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.io.DataOutputStream;
36<a name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> java.net.Socket;
37<a name="27" href="#27">27</a>
38<a name="28" href="#28">28</a> <em class="jxr_javadoccomment">/**</em>
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<a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> remote {@link ExternallyRolledFileAppender}. </em>
41<a name="31" href="#31">31</a>
42<a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> <p>It takes two arguments, the <code>host_name</code> and</em>
43<a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> <code>port_number</code> where the</em>
44<a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> <code>ExternallyRolledFileAppender</code> is listening.</em>
45<a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> </em>
46<a name="36" href="#36">36</a>
47<a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> @author Ceki G&uuml;lc&uuml;</em>
48<a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> @since version 0.9.0 */</em>
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<a name="40" href="#40">40</a>
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<a name="42" href="#42">42</a>
53<a name="43" href="#43">43</a>
54<a name="44" href="#44">44</a> <strong class="jxr_keyword">static</strong> String host;
55<a name="45" href="#45">45</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> port;
56<a name="46" href="#46">46</a>
57<a name="47" href="#47">47</a> <em class="jxr_comment">// Static class.</em>
58<a name="48" href="#48">48</a> <a href="../../../../org/apache/log4j/varia/Roller.html">Roller</a>() {
59<a name="49" href="#49">49</a> }
60<a name="50" href="#50">50</a>
61<a name="51" href="#51">51</a> <em class="jxr_javadoccomment">/**</em>
62<a name="52" href="#52">52</a> <em class="jxr_javadoccomment"> Send a "RollOver" message to</em>
63<a name="53" href="#53">53</a> <em class="jxr_javadoccomment"> <code>ExternallyRolledFileAppender</code> on <code>host</code></em>
64<a name="54" href="#54">54</a> <em class="jxr_javadoccomment"> and <code>port</code>.</em>
65<a name="55" href="#55">55</a>
66<a name="56" href="#56">56</a> <em class="jxr_javadoccomment"> */</em>
67<a name="57" href="#57">57</a> <strong class="jxr_keyword">public</strong>
68<a name="58" href="#58">58</a> <strong class="jxr_keyword">static</strong>
69<a name="59" href="#59">59</a> <strong class="jxr_keyword">void</strong> main(String argv[]) {
70<a name="60" href="#60">60</a>
71<a name="61" href="#61">61</a> BasicConfigurator.configure();
72<a name="62" href="#62">62</a>
73<a name="63" href="#63">63</a> <strong class="jxr_keyword">if</strong>(argv.length == 2)
74<a name="64" href="#64">64</a> init(argv[0], argv[1]);
75<a name="65" href="#65">65</a> <strong class="jxr_keyword">else</strong>
76<a name="66" href="#66">66</a> usage(<span class="jxr_string">"Wrong number of arguments."</span>);
77<a name="67" href="#67">67</a>
78<a name="68" href="#68">68</a> roll();
79<a name="69" href="#69">69</a> }
80<a name="70" href="#70">70</a>
81<a name="71" href="#71">71</a> <strong class="jxr_keyword">static</strong>
82<a name="72" href="#72">72</a> <strong class="jxr_keyword">void</strong> usage(String msg) {
83<a name="73" href="#73">73</a> System.err.println(msg);
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<a name="75" href="#75">75</a> <span class="jxr_string">"host_name port_number"</span>);
86<a name="76" href="#76">76</a> System.exit(1);
87<a name="77" href="#77">77</a> }
88<a name="78" href="#78">78</a>
89<a name="79" href="#79">79</a> <strong class="jxr_keyword">static</strong>
90<a name="80" href="#80">80</a> <strong class="jxr_keyword">void</strong> init(String hostArg, String portArg) {
91<a name="81" href="#81">81</a> host = hostArg;
92<a name="82" href="#82">82</a> <strong class="jxr_keyword">try</strong> {
93<a name="83" href="#83">83</a> port = Integer.parseInt(portArg);
94<a name="84" href="#84">84</a> }
95<a name="85" href="#85">85</a> <strong class="jxr_keyword">catch</strong>(java.lang.NumberFormatException e) {
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<a name="87" href="#87">87</a> }
98<a name="88" href="#88">88</a> }
99<a name="89" href="#89">89</a>
100<a name="90" href="#90">90</a> <strong class="jxr_keyword">static</strong>
101<a name="91" href="#91">91</a> <strong class="jxr_keyword">void</strong> roll() {
102<a name="92" href="#92">92</a> <strong class="jxr_keyword">try</strong> {
103<a name="93" href="#93">93</a> Socket socket = <strong class="jxr_keyword">new</strong> Socket(host, port);
104<a name="94" href="#94">94</a> DataOutputStream dos = <strong class="jxr_keyword">new</strong> DataOutputStream(socket.getOutputStream());
105<a name="95" href="#95">95</a> DataInputStream dis = <strong class="jxr_keyword">new</strong> DataInputStream(socket.getInputStream());
106<a name="96" href="#96">96</a> dos.writeUTF(ExternallyRolledFileAppender.ROLL_OVER);
107<a name="97" href="#97">97</a> String rc = dis.readUTF();
108<a name="98" href="#98">98</a> <strong class="jxr_keyword">if</strong>(ExternallyRolledFileAppender.OK.equals(rc)) {
109<a name="99" href="#99">99</a> cat.info(<span class="jxr_string">"Roll over signal acknowledged by remote appender."</span>);
110<a name="100" href="#100">100</a> } <strong class="jxr_keyword">else</strong> {
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<a name="102" href="#102">102</a> System.exit(2);
113<a name="103" href="#103">103</a> }
114<a name="104" href="#104">104</a> } <strong class="jxr_keyword">catch</strong>(IOException e) {
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<a name="106" href="#106">106</a> e);
117<a name="107" href="#107">107</a> System.exit(2);
118<a name="108" href="#108">108</a> }
119<a name="109" href="#109">109</a> System.exit(0);
120<a name="110" href="#110">110</a> }
121<a name="111" href="#111">111</a> }
122</pre>
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