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| <a name="1" href="#1">1</a> <em class="jxr_comment">/*</em> |
| <a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em> |
| <a name="3" href="#3">3</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em> |
| <a name="4" href="#4">4</a> <em class="jxr_comment"> * distributed with this work for additional information</em> |
| <a name="5" href="#5">5</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em> |
| <a name="6" href="#6">6</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em> |
| <a name="7" href="#7">7</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em> |
| <a name="8" href="#8">8</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em> |
| <a name="9" href="#9">9</a> <em class="jxr_comment"> *</em> |
| <a name="10" href="#10">10</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> |
| <a name="11" href="#11">11</a> <em class="jxr_comment"> *</em> |
| <a name="12" href="#12">12</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em> |
| <a name="13" href="#13">13</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em> |
| <a name="14" href="#14">14</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em> |
| <a name="15" href="#15">15</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em> |
| <a name="16" href="#16">16</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em> |
| <a name="17" href="#17">17</a> <em class="jxr_comment"> * under the License.</em> |
| <a name="18" href="#18">18</a> <em class="jxr_comment"> *</em> |
| <a name="19" href="#19">19</a> <em class="jxr_comment"> */</em> |
| <a name="20" href="#20">20</a> <strong class="jxr_keyword">package</strong> org.apache.mina.example.imagine.step3.server; |
| <a name="21" href="#21">21</a> |
| <a name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.awt.Color; |
| <a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.awt.Font; |
| <a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.awt.Graphics; |
| <a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.awt.image.BufferedImage; |
| <a name="26" href="#26">26</a> |
| <a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> javax.management.MBeanServer; |
| <a name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> javax.management.ObjectName; |
| <a name="29" href="#29">29</a> |
| <a name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.mina.core.service.IoHandlerAdapter; |
| <a name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> org.apache.mina.core.session.IoSession; |
| <a name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> org.apache.mina.example.imagine.step1.ImageRequest; |
| <a name="33" href="#33">33</a> <strong class="jxr_keyword">import</strong> org.apache.mina.example.imagine.step1.ImageResponse; |
| <a name="34" href="#34">34</a> <strong class="jxr_keyword">import</strong> org.apache.mina.integration.jmx.IoSessionMBean; |
| <a name="35" href="#35">35</a> <strong class="jxr_keyword">import</strong> org.slf4j.Logger; |
| <a name="36" href="#36">36</a> <strong class="jxr_keyword">import</strong> org.slf4j.LoggerFactory; |
| <a name="37" href="#37">37</a> |
| <a name="38" href="#38">38</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * server-side {@link org.apache.mina.core.service.IoHandler}</em> |
| <a name="40" href="#40">40</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="41" href="#41">41</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="http://mina.apache.org" target="alexandria_uri">http://mina.apache.org</a>">Apache MINA Project</a></em> |
| <a name="42" href="#42">42</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="43" href="#43">43</a> |
| <a name="44" href="#44">44</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../../org/apache/mina/example/imagine/step3/server/ImageServerIoHandler.html">ImageServerIoHandler</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../../../org/apache/mina/core/service/IoHandlerAdapter.html">IoHandlerAdapter</a> { |
| <a name="45" href="#45">45</a> |
| <a name="46" href="#46">46</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">static</strong> String characters = <span class="jxr_string">"mina rocks abcdefghijklmnopqrstuvwxyz0123456789"</span>; |
| <a name="47" href="#47">47</a> |
| <a name="48" href="#48">48</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String INDEX_KEY = ImageServerIoHandler.<strong class="jxr_keyword">class</strong>.getName() + <span class="jxr_string">".INDEX"</span>; |
| <a name="49" href="#49">49</a> |
| <a name="50" href="#50">50</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger LOGGER = LoggerFactory.getLogger(ImageServerIoHandler.<strong class="jxr_keyword">class</strong>); |
| <a name="51" href="#51">51</a> |
| <a name="52" href="#52">52</a> <strong class="jxr_keyword">private</strong> MBeanServer mBeanServer; |
| <a name="53" href="#53">53</a> |
| <a name="54" href="#54">54</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="55" href="#55">55</a> <em class="jxr_javadoccomment"> * Creates a new instance of ImageServerIoHandler. For this step, we pass in a reference</em> |
| <a name="56" href="#56">56</a> <em class="jxr_javadoccomment"> * to the MBeanServer. This instance will be used to register new IoSession objects</em> |
| <a name="57" href="#57">57</a> <em class="jxr_javadoccomment"> * so that the JMX subsystem can report statistics on the sessions.</em> |
| <a name="58" href="#58">58</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="59" href="#59">59</a> <em class="jxr_javadoccomment"> * @param mBeanServer</em> |
| <a name="60" href="#60">60</a> <em class="jxr_javadoccomment"> * The JMX MBeanServer that will register the sessions</em> |
| <a name="61" href="#61">61</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="62" href="#62">62</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../../../org/apache/mina/example/imagine/step3/server/ImageServerIoHandler.html">ImageServerIoHandler</a>( MBeanServer mBeanServer ) { |
| <a name="63" href="#63">63</a> <strong class="jxr_keyword">this</strong>.mBeanServer = mBeanServer; |
| <a name="64" href="#64">64</a> } |
| <a name="65" href="#65">65</a> |
| <a name="66" href="#66">66</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="67" href="#67">67</a> <em class="jxr_javadoccomment"> * This method is called first when a new connection to the server is made. In here we will set</em> |
| <a name="68" href="#68">68</a> <em class="jxr_javadoccomment"> * up the JMX session MBean.</em> |
| <a name="69" href="#69">69</a> <em class="jxr_javadoccomment"> * </em> |
| <a name="70" href="#70">70</a> <em class="jxr_javadoccomment"> * @see org.apache.mina.core.service.IoHandlerAdapter#sessionCreated(org.apache.mina.core.session.IoSession)</em> |
| <a name="71" href="#71">71</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="72" href="#72">72</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> sessionCreated( IoSession session ) <strong class="jxr_keyword">throws</strong> Exception |
| <a name="73" href="#73">73</a> { |
| <a name="74" href="#74">74</a> <em class="jxr_comment">// create a session MBean in order to load into the MBeanServer and allow</em> |
| <a name="75" href="#75">75</a> <em class="jxr_comment">// this session to be managed by the JMX subsystem.</em> |
| <a name="76" href="#76">76</a> <a href="../../../../../../../org/apache/mina/integration/jmx/IoSessionMBean.html">IoSessionMBean</a> sessionMBean = <strong class="jxr_keyword">new</strong> <a href="../../../../../../../org/apache/mina/integration/jmx/IoSessionMBean.html">IoSessionMBean</a>( session ); |
| <a name="77" href="#77">77</a> |
| <a name="78" href="#78">78</a> <em class="jxr_comment">// create a JMX ObjectName. This has to be in a specific format. </em> |
| <a name="79" href="#79">79</a> ObjectName sessionName = <strong class="jxr_keyword">new</strong> ObjectName( session.getClass().getPackage().getName() + |
| <a name="80" href="#80">80</a> <span class="jxr_string">":type=session,name="</span> + session.getClass().getSimpleName() + <span class="jxr_string">"-"</span> + session.getId()); |
| <a name="81" href="#81">81</a> |
| <a name="82" href="#82">82</a> <em class="jxr_comment">// register the bean on the MBeanServer. Without this line, no JMX will happen for</em> |
| <a name="83" href="#83">83</a> <em class="jxr_comment">// this session</em> |
| <a name="84" href="#84">84</a> mBeanServer.registerMBean( sessionMBean, sessionName ); |
| <a name="85" href="#85">85</a> } |
| <a name="86" href="#86">86</a> |
| <a name="87" href="#87">87</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="88" href="#88">88</a> <em class="jxr_javadoccomment"> * Called when the session is opened, which will come after the session created.</em> |
| <a name="89" href="#89">89</a> <em class="jxr_javadoccomment"> * </em> |
| <a name="90" href="#90">90</a> <em class="jxr_javadoccomment"> * @see org.apache.mina.core.service.IoHandlerAdapter#sessionOpened(org.apache.mina.core.session.IoSession)</em> |
| <a name="91" href="#91">91</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="92" href="#92">92</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> sessionOpened(<a href="../../../../../../../org/apache/mina/core/session/IoSession.html">IoSession</a> session) <strong class="jxr_keyword">throws</strong> Exception { |
| <a name="93" href="#93">93</a> |
| <a name="94" href="#94">94</a> <em class="jxr_comment">// set the index to zero. This is used to determine how the build the</em> |
| <a name="95" href="#95">95</a> <em class="jxr_comment">// string that is sent to the client.</em> |
| <a name="96" href="#96">96</a> session.setAttribute(INDEX_KEY, 0); |
| <a name="97" href="#97">97</a> } |
| <a name="98" href="#98">98</a> |
| <a name="99" href="#99">99</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * This method will be called whenever an exception occurs. For this handler,</em> |
| <a name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * the logger will generate a warning message.</em> |
| <a name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * </em> |
| <a name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * @see org.apache.mina.core.service.IoHandlerAdapter#exceptionCaught(org.apache.mina.core.session.IoSession, java.lang.Throwable)</em> |
| <a name="104" href="#104">104</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="105" href="#105">105</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> exceptionCaught(<a href="../../../../../../../org/apache/mina/core/session/IoSession.html">IoSession</a> session, Throwable cause) <strong class="jxr_keyword">throws</strong> Exception { |
| <a name="106" href="#106">106</a> LOGGER.warn(cause.getMessage(), cause); |
| <a name="107" href="#107">107</a> } |
| <a name="108" href="#108">108</a> |
| <a name="109" href="#109">109</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * Handle incoming messages.</em> |
| <a name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * </em> |
| <a name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * @see org.apache.mina.core.service.IoHandlerAdapter#messageReceived(org.apache.mina.core.session.IoSession, java.lang.Object)</em> |
| <a name="113" href="#113">113</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="114" href="#114">114</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> messageReceived(<a href="../../../../../../../org/apache/mina/core/session/IoSession.html">IoSession</a> session, Object message) <strong class="jxr_keyword">throws</strong> Exception { |
| <a name="115" href="#115">115</a> <a href="../../../../../../../org/apache/mina/example/imagine/step1/ImageRequest.html">ImageRequest</a> request = (ImageRequest) message; |
| <a name="116" href="#116">116</a> String text1 = generateString(session, request.getNumberOfCharacters()); |
| <a name="117" href="#117">117</a> String text2 = generateString(session, request.getNumberOfCharacters()); |
| <a name="118" href="#118">118</a> BufferedImage image1 = createImage(request, text1); |
| <a name="119" href="#119">119</a> BufferedImage image2 = createImage(request, text2); |
| <a name="120" href="#120">120</a> <a href="../../../../../../../org/apache/mina/example/imagine/step1/ImageResponse.html">ImageResponse</a> response = <strong class="jxr_keyword">new</strong> <a href="../../../../../../../org/apache/mina/example/imagine/step1/ImageResponse.html">ImageResponse</a>(image1, image2); |
| <a name="121" href="#121">121</a> session.write(response); |
| <a name="122" href="#122">122</a> } |
| <a name="123" href="#123">123</a> |
| <a name="124" href="#124">124</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="125" href="#125">125</a> <em class="jxr_javadoccomment"> * Create an image using the specified request and the text. </em> |
| <a name="126" href="#126">126</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * @param request</em> |
| <a name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * Determines the height and width of the image</em> |
| <a name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * @param text</em> |
| <a name="130" href="#130">130</a> <em class="jxr_javadoccomment"> * The text that is placed in the image</em> |
| <a name="131" href="#131">131</a> <em class="jxr_javadoccomment"> * @return</em> |
| <a name="132" href="#132">132</a> <em class="jxr_javadoccomment"> * a BufferedImage representing the text.</em> |
| <a name="133" href="#133">133</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="134" href="#134">134</a> <strong class="jxr_keyword">private</strong> BufferedImage createImage(<a href="../../../../../../../org/apache/mina/example/imagine/step1/ImageRequest.html">ImageRequest</a> request, String text) { |
| <a name="135" href="#135">135</a> BufferedImage image = <strong class="jxr_keyword">new</strong> BufferedImage(request.getWidth(), request.getHeight(), BufferedImage.TYPE_BYTE_INDEXED); |
| <a name="136" href="#136">136</a> Graphics graphics = image.createGraphics(); |
| <a name="137" href="#137">137</a> graphics.setColor(Color.YELLOW); |
| <a name="138" href="#138">138</a> graphics.fillRect(0, 0, image.getWidth(), image.getHeight()); |
| <a name="139" href="#139">139</a> Font serif = <strong class="jxr_keyword">new</strong> Font(<span class="jxr_string">"serif"</span>, Font.PLAIN, 30); |
| <a name="140" href="#140">140</a> graphics.setFont(serif); |
| <a name="141" href="#141">141</a> graphics.setColor(Color.BLUE); |
| <a name="142" href="#142">142</a> graphics.drawString(text, 10, 50); |
| <a name="143" href="#143">143</a> <strong class="jxr_keyword">return</strong> image; |
| <a name="144" href="#144">144</a> } |
| <a name="145" href="#145">145</a> |
| <a name="146" href="#146">146</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="147" href="#147">147</a> <em class="jxr_javadoccomment"> * Generate a string based on the 'characters' field in this class. The</em> |
| <a name="148" href="#148">148</a> <em class="jxr_javadoccomment"> * characters that make up the string are based on the session </em> |
| <a name="149" href="#149">149</a> <em class="jxr_javadoccomment"> * attribute "INDEX_KEY"</em> |
| <a name="150" href="#150">150</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="151" href="#151">151</a> <em class="jxr_javadoccomment"> * @param session</em> |
| <a name="152" href="#152">152</a> <em class="jxr_javadoccomment"> * The {@link IoSession} object that will provide the INDEX_KEY attribute</em> |
| <a name="153" href="#153">153</a> <em class="jxr_javadoccomment"> * @param length</em> |
| <a name="154" href="#154">154</a> <em class="jxr_javadoccomment"> * The length that the String will be</em> |
| <a name="155" href="#155">155</a> <em class="jxr_javadoccomment"> * @return</em> |
| <a name="156" href="#156">156</a> <em class="jxr_javadoccomment"> * The generated String</em> |
| <a name="157" href="#157">157</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="158" href="#158">158</a> <strong class="jxr_keyword">private</strong> String generateString(<a href="../../../../../../../org/apache/mina/core/session/IoSession.html">IoSession</a> session, <strong class="jxr_keyword">int</strong> length) { |
| <a name="159" href="#159">159</a> Integer index = (Integer) session.getAttribute(INDEX_KEY); |
| <a name="160" href="#160">160</a> StringBuilder buffer = <strong class="jxr_keyword">new</strong> StringBuilder(length); |
| <a name="161" href="#161">161</a> <strong class="jxr_keyword">while</strong> (buffer.length() < length) { |
| <a name="162" href="#162">162</a> buffer.append(characters.charAt(index)); |
| <a name="163" href="#163">163</a> index++; |
| <a name="164" href="#164">164</a> <strong class="jxr_keyword">if</strong> (index >= characters.length()) { |
| <a name="165" href="#165">165</a> index = 0; |
| <a name="166" href="#166">166</a> } |
| <a name="167" href="#167">167</a> } |
| <a name="168" href="#168">168</a> session.setAttribute(INDEX_KEY, index); |
| <a name="169" href="#169">169</a> <strong class="jxr_keyword">return</strong> buffer.toString(); |
| <a name="170" href="#170">170</a> } |
| <a name="171" href="#171">171</a> |
| <a name="172" href="#172">172</a> } |
| </pre> |
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