errorgeneratingfilter.html

MINA+API 关于MINA的API

<a name="100" href="#100">100</a>                     <em class="jxr_comment">// later</em>
<a name="101" href="#101">101</a>                     <em class="jxr_comment">// TODO</em>
<a name="102" href="#102">102</a>                 }
<a name="103" href="#103">103</a>                 <strong class="jxr_keyword">if</strong> (removePduProbability &gt; rng.nextInt()) {
<a name="104" href="#104">104</a>                     <strong class="jxr_keyword">return</strong>;
<a name="105" href="#105">105</a>                 }
<a name="106" href="#106">106</a>             }
<a name="107" href="#107">107</a>         }
<a name="108" href="#108">108</a>         nextFilter.filterWrite(session, writeRequest);
<a name="109" href="#109">109</a>     }
<a name="110" href="#110">110</a> 
<a name="111" href="#111">111</a>     @Override
<a name="112" href="#112">112</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> messageReceived(<a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session,
<a name="113" href="#113">113</a>             Object message) <strong class="jxr_keyword">throws</strong> Exception {
<a name="114" href="#114">114</a>         <strong class="jxr_keyword">if</strong> (manipulateReads) {
<a name="115" href="#115">115</a>             <strong class="jxr_keyword">if</strong> (message instanceof IoBuffer) {
<a name="116" href="#116">116</a>                 <em class="jxr_comment">// manipulate bytes</em>
<a name="117" href="#117">117</a>                 manipulateIoBuffer(session, (IoBuffer) message);
<a name="118" href="#118">118</a>                 <a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> buffer = insertBytesToNewIoBuffer(session,
<a name="119" href="#119">119</a>                         (<a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a>) message);
<a name="120" href="#120">120</a>                 <strong class="jxr_keyword">if</strong> (buffer != <strong class="jxr_keyword">null</strong>) {
<a name="121" href="#121">121</a>                     message = buffer;
<a name="122" href="#122">122</a>                 }
<a name="123" href="#123">123</a>             } <strong class="jxr_keyword">else</strong> {
<a name="124" href="#124">124</a>                 <em class="jxr_comment">// manipulate PDU</em>
<a name="125" href="#125">125</a>             }
<a name="126" href="#126">126</a>         }
<a name="127" href="#127">127</a>         nextFilter.messageReceived(session, message);
<a name="128" href="#128">128</a>     }
<a name="129" href="#129">129</a> 
<a name="130" href="#130">130</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> insertBytesToNewIoBuffer(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> buffer) {
<a name="131" href="#131">131</a>         <strong class="jxr_keyword">if</strong> (insertByteProbability &gt; rng.nextInt(1000)) {
<a name="132" href="#132">132</a>             logger.info(buffer.getHexDump());
<a name="133" href="#133">133</a>             <em class="jxr_comment">// where to insert bytes ?</em>
<a name="134" href="#134">134</a>             <strong class="jxr_keyword">int</strong> pos = rng.nextInt(buffer.remaining()) - 1;
<a name="135" href="#135">135</a> 
<a name="136" href="#136">136</a>             <em class="jxr_comment">// how many byte to insert ?</em>
<a name="137" href="#137">137</a>             <strong class="jxr_keyword">int</strong> count = rng.nextInt(maxInsertByte-1)+1;
<a name="138" href="#138">138</a> 
<a name="139" href="#139">139</a>             <a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> newBuff = IoBuffer.allocate(buffer.remaining() + count);
<a name="140" href="#140">140</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; pos; i++)
<a name="141" href="#141">141</a>                 newBuff.put(buffer.get());
<a name="142" href="#142">142</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; count; i++) {
<a name="143" href="#143">143</a>                 newBuff.put((byte) (rng.nextInt(256)));
<a name="144" href="#144">144</a>             }
<a name="145" href="#145">145</a>             <strong class="jxr_keyword">while</strong> (buffer.remaining() &gt; 0) {
<a name="146" href="#146">146</a>                 newBuff.put(buffer.get());
<a name="147" href="#147">147</a>             }
<a name="148" href="#148">148</a>             newBuff.flip();
<a name="149" href="#149">149</a> 
<a name="150" href="#150">150</a>             logger.info(<span class="jxr_string">"Inserted "</span> + count + <span class="jxr_string">" bytes."</span>);
<a name="151" href="#151">151</a>             logger.info(newBuff.getHexDump());
<a name="152" href="#152">152</a>             <strong class="jxr_keyword">return</strong> newBuff;
<a name="153" href="#153">153</a>         }
<a name="154" href="#154">154</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="155" href="#155">155</a>     }
<a name="156" href="#156">156</a> 
<a name="157" href="#157">157</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> manipulateIoBuffer(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> buffer) {
<a name="158" href="#158">158</a>         <strong class="jxr_keyword">if</strong> (removeByteProbability &gt; rng.nextInt(1000)) {
<a name="159" href="#159">159</a>             logger.info(buffer.getHexDump());
<a name="160" href="#160">160</a>             <em class="jxr_comment">// where to remove bytes ?</em>
<a name="161" href="#161">161</a>             <strong class="jxr_keyword">int</strong> pos = rng.nextInt(buffer.remaining());
<a name="162" href="#162">162</a>             <em class="jxr_comment">// how many byte to remove ?</em>
<a name="163" href="#163">163</a>             <strong class="jxr_keyword">int</strong> count = rng.nextInt(buffer.remaining() - pos) + 1;
<a name="164" href="#164">164</a>             <strong class="jxr_keyword">if</strong> (count == buffer.remaining())
<a name="165" href="#165">165</a>                 count = buffer.remaining() - 1;
<a name="166" href="#166">166</a> 
<a name="167" href="#167">167</a>             <a href="../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> newBuff = IoBuffer.allocate(buffer.remaining() - count);
<a name="168" href="#168">168</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; pos; i++)
<a name="169" href="#169">169</a>                 newBuff.put(buffer.get());
<a name="170" href="#170">170</a> 
<a name="171" href="#171">171</a>             buffer.skip(count); <em class="jxr_comment">// hole</em>
<a name="172" href="#172">172</a>             <strong class="jxr_keyword">while</strong> (newBuff.remaining() &gt; 0)
<a name="173" href="#173">173</a>                 newBuff.put(buffer.get());
<a name="174" href="#174">174</a>             newBuff.flip();
<a name="175" href="#175">175</a>             <em class="jxr_comment">// copy the new buffer in the old one</em>
<a name="176" href="#176">176</a>             buffer.rewind();
<a name="177" href="#177">177</a>             buffer.put(newBuff);
<a name="178" href="#178">178</a>             buffer.flip();
<a name="179" href="#179">179</a>             logger.info(<span class="jxr_string">"Removed "</span> + count + <span class="jxr_string">" bytes at position "</span> + pos + <span class="jxr_string">"."</span>);
<a name="180" href="#180">180</a>             logger.info(buffer.getHexDump());
<a name="181" href="#181">181</a>         }
<a name="182" href="#182">182</a>         <strong class="jxr_keyword">if</strong> (changeByteProbability &gt; rng.nextInt(1000)) {
<a name="183" href="#183">183</a>             logger.info(buffer.getHexDump());
<a name="184" href="#184">184</a>             <em class="jxr_comment">// how many byte to change ?</em>
<a name="185" href="#185">185</a>             <strong class="jxr_keyword">int</strong> count = rng.nextInt(buffer.remaining() - 1) + 1;
<a name="186" href="#186">186</a> 
<a name="187" href="#187">187</a>             byte[] values = <strong class="jxr_keyword">new</strong> byte[count];
<a name="188" href="#188">188</a>             rng.nextBytes(values);
<a name="189" href="#189">189</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; values.length; i++) {
<a name="190" href="#190">190</a>                 <strong class="jxr_keyword">int</strong> pos = rng.nextInt(buffer.remaining());
<a name="191" href="#191">191</a>                 buffer.put(pos, values[i]);
<a name="192" href="#192">192</a>             }
<a name="193" href="#193">193</a>             logger.info(<span class="jxr_string">"Modified "</span> + count + <span class="jxr_string">" bytes."</span>);
<a name="194" href="#194">194</a>             logger.info(buffer.getHexDump());
<a name="195" href="#195">195</a>         }
<a name="196" href="#196">196</a>     }
<a name="197" href="#197">197</a> 
<a name="198" href="#198">198</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getChangeByteProbability() {
<a name="199" href="#199">199</a>         <strong class="jxr_keyword">return</strong> changeByteProbability;
<a name="200" href="#200">200</a>     }
<a name="201" href="#201">201</a>     
<a name="202" href="#202">202</a>     <em class="jxr_javadoccomment">/**</em>
<a name="203" href="#203">203</a> <em class="jxr_javadoccomment">     * Set the probability for the change byte error.</em>
<a name="204" href="#204">204</a> <em class="jxr_javadoccomment">     * If this probability is &gt; 0 the filter will modify a random number of byte</em>
<a name="205" href="#205">205</a> <em class="jxr_javadoccomment">     * of the processed {@link IoBuffer}.</em>
<a name="206" href="#206">206</a> <em class="jxr_javadoccomment">     * @param changeByteProbability probability of modifying an IoBuffer out of 1000 processed {@link IoBuffer} </em>
<a name="207" href="#207">207</a> <em class="jxr_javadoccomment">     */</em>
<a name="208" href="#208">208</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setChangeByteProbability(<strong class="jxr_keyword">int</strong> changeByteProbability) {