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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> *<a name="line.18"></a> |
| <span class="sourceLineNo">019</span> */<a name="line.19"></a> |
| <span class="sourceLineNo">020</span>package org.apache.mina.example.imagine.step1.server;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.mina.core.service.IoHandlerAdapter;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.mina.core.session.IoSession;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.mina.example.imagine.step1.ImageRequest;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.mina.example.imagine.step1.ImageResponse;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.slf4j.Logger;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.slf4j.LoggerFactory;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span><a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import java.awt.Color;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import java.awt.Font;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import java.awt.Graphics;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import java.awt.image.BufferedImage;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span><a name="line.33"></a> |
| <span class="sourceLineNo">034</span>/**<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * server-side {@link org.apache.mina.core.service.IoHandler}<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * @author <a href="http://mina.apache.org">Apache MINA Project</a><a name="line.37"></a> |
| <span class="sourceLineNo">038</span> */<a name="line.38"></a> |
| <span class="sourceLineNo">039</span><a name="line.39"></a> |
| <span class="sourceLineNo">040</span>public class ImageServerIoHandler extends IoHandlerAdapter {<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private final static String characters = "mina rocks abcdefghijklmnopqrstuvwxyz0123456789";<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> public static final String INDEX_KEY = ImageServerIoHandler.class.getName() + ".INDEX";<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> private static Logger LOGGER = LoggerFactory.getLogger(ImageServerIoHandler.class);<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> /**<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * Called when the session is opened, which will come after the session created.<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * <a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * @see org.apache.mina.core.service.IoHandlerAdapter#sessionOpened(org.apache.mina.core.session.IoSession)<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> */<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> public void sessionOpened(IoSession session) throws Exception {<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> session.setAttribute(INDEX_KEY, 0);<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> }<a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span> /**<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * This method will be called whenever an exception occurs. For this handler,<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * the logger will generate a warning message.<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * <a name="line.60"></a> |
| <span class="sourceLineNo">061</span> * @see org.apache.mina.core.service.IoHandlerAdapter#exceptionCaught(org.apache.mina.core.session.IoSession, java.lang.Throwable)<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> */<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> public void exceptionCaught(IoSession session, Throwable cause) throws Exception {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> LOGGER.warn(cause.getMessage(), cause);<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> }<a name="line.65"></a> |
| <span class="sourceLineNo">066</span><a name="line.66"></a> |
| <span class="sourceLineNo">067</span> /**<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * Handle incoming messages.<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * <a name="line.69"></a> |
| <span class="sourceLineNo">070</span> * @see org.apache.mina.core.service.IoHandlerAdapter#messageReceived(org.apache.mina.core.session.IoSession, java.lang.Object)<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> */<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> public void messageReceived(IoSession session, Object message) throws Exception {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> ImageRequest request = (ImageRequest) message;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> String text1 = generateString(session, request.getNumberOfCharacters());<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> String text2 = generateString(session, request.getNumberOfCharacters());<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> BufferedImage image1 = createImage(request, text1);<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> BufferedImage image2 = createImage(request, text2);<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> ImageResponse response = new ImageResponse(image1, image2);<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> session.write(response);<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> }<a name="line.80"></a> |
| <span class="sourceLineNo">081</span><a name="line.81"></a> |
| <span class="sourceLineNo">082</span> /**<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * Create an image using the specified request and the text. <a name="line.83"></a> |
| <span class="sourceLineNo">084</span> *<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * @param request<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * Determines the height and width of the image<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> * @param text<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> * The text that is placed in the image<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> * @return<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> * a BufferedImage representing the text.<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> */<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> private BufferedImage createImage(ImageRequest request, String text) {<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> BufferedImage image = new BufferedImage(request.getWidth(), request.getHeight(), BufferedImage.TYPE_BYTE_INDEXED);<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> Graphics graphics = image.createGraphics();<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> graphics.setColor(Color.YELLOW);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> graphics.fillRect(0, 0, image.getWidth(), image.getHeight());<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> Font serif = new Font("serif", Font.PLAIN, 30);<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> graphics.setFont(serif);<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> graphics.setColor(Color.BLUE);<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> graphics.drawString(text, 10, 50);<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> return image;<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> }<a name="line.102"></a> |
| <span class="sourceLineNo">103</span><a name="line.103"></a> |
| <span class="sourceLineNo">104</span> /**<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * Generate a string based on the 'characters' field in this class. The<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * characters that make up the string are based on the session <a name="line.106"></a> |
| <span class="sourceLineNo">107</span> * attribute "INDEX_KEY"<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> *<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * @param session<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * The {@link IoSession} object that will provide the INDEX_KEY attribute<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> * @param length<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> * The length that the String will be<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> * @return<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> * The generated String<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> */<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> private String generateString(IoSession session, int length) {<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> Integer index = (Integer) session.getAttribute(INDEX_KEY);<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> StringBuffer buffer = new StringBuffer(length);<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> while (buffer.length() < length) {<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> buffer.append(characters.charAt(index));<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> index++;<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> if (index >= characters.length()) {<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> index = 0;<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> }<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> }<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> session.setAttribute(INDEX_KEY, index);<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> return buffer.toString();<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> }<a name="line.128"></a> |
| <span class="sourceLineNo">129</span><a name="line.129"></a> |
| <span class="sourceLineNo">130</span>}<a name="line.130"></a> |
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