decodingstatemachine.html

MINA+API 关于MINA的API

<a name="78" href="#78">78</a>                  <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {
<a name="79" href="#79">79</a>                      <strong class="jxr_keyword">return</strong> finishDecode(childProducts, out);
<a name="80" href="#80">80</a>                  }
<a name="81" href="#81">81</a>  
<a name="82" href="#82">82</a>                  <strong class="jxr_keyword">int</strong> newPos = in.position();
<a name="83" href="#83">83</a>  
<a name="84" href="#84">84</a>                  <em class="jxr_comment">// Wait for more data if nothing is consumed and state didn't change.</em>
<a name="85" href="#85">85</a>                  <strong class="jxr_keyword">if</strong> (newPos == pos &amp;&amp; oldState == state) {
<a name="86" href="#86">86</a>                      <strong class="jxr_keyword">break</strong>;
<a name="87" href="#87">87</a>                  }
<a name="88" href="#88">88</a>                  pos = newPos;
<a name="89" href="#89">89</a>              }
<a name="90" href="#90">90</a>  
<a name="91" href="#91">91</a>              <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="92" href="#92">92</a>          } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="93" href="#93">93</a>              state = <strong class="jxr_keyword">null</strong>;
<a name="94" href="#94">94</a>              <strong class="jxr_keyword">throw</strong> e;
<a name="95" href="#95">95</a>          } <strong class="jxr_keyword">finally</strong> {
<a name="96" href="#96">96</a>              <strong class="jxr_keyword">this</strong>.currentState = state;
<a name="97" href="#97">97</a>  
<a name="98" href="#98">98</a>              <em class="jxr_comment">// Destroy if decoding is finished or failed.</em>
<a name="99" href="#99">99</a>              <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {
<a name="100" href="#100">100</a>                 cleanup();
<a name="101" href="#101">101</a>             }
<a name="102" href="#102">102</a>         }
<a name="103" href="#103">103</a>     }
<a name="104" href="#104">104</a> 
<a name="105" href="#105">105</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> finishDecode(<a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html">ProtocolDecoderOutput</a> out)
<a name="106" href="#106">106</a>             <strong class="jxr_keyword">throws</strong> Exception {
<a name="107" href="#107">107</a>         <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> nextState;
<a name="108" href="#108">108</a>         <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> state = getCurrentState();
<a name="109" href="#109">109</a>         <strong class="jxr_keyword">try</strong> {
<a name="110" href="#110">110</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a name="111" href="#111">111</a>                 <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> oldState = state;
<a name="112" href="#112">112</a>                 state = state.finishDecode(childOutput);
<a name="113" href="#113">113</a>                 <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {
<a name="114" href="#114">114</a>                     <em class="jxr_comment">// Finished</em>
<a name="115" href="#115">115</a>                     <strong class="jxr_keyword">break</strong>;
<a name="116" href="#116">116</a>                 }
<a name="117" href="#117">117</a>     
<a name="118" href="#118">118</a>                 <em class="jxr_comment">// Exit if state didn't change.</em>
<a name="119" href="#119">119</a>                 <strong class="jxr_keyword">if</strong> (oldState == state) {
<a name="120" href="#120">120</a>                     <strong class="jxr_keyword">break</strong>;
<a name="121" href="#121">121</a>                 }
<a name="122" href="#122">122</a>             }
<a name="123" href="#123">123</a>         } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="124" href="#124">124</a>             state = <strong class="jxr_keyword">null</strong>;
<a name="125" href="#125">125</a>             log.debug(
<a name="126" href="#126">126</a>                     <span class="jxr_string">"Ignoring the exception caused by a closed session."</span>, e);
<a name="127" href="#127">127</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="128" href="#128">128</a>             <strong class="jxr_keyword">this</strong>.currentState = state;
<a name="129" href="#129">129</a>             nextState = finishDecode(childProducts, out);
<a name="130" href="#130">130</a>             <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {
<a name="131" href="#131">131</a>                 cleanup();
<a name="132" href="#132">132</a>             }
<a name="133" href="#133">133</a>         }
<a name="134" href="#134">134</a>         <strong class="jxr_keyword">return</strong> nextState;
<a name="135" href="#135">135</a>     }
<a name="136" href="#136">136</a> 
<a name="137" href="#137">137</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> cleanup() {
<a name="138" href="#138">138</a>         <strong class="jxr_keyword">if</strong> (!initialized) {
<a name="139" href="#139">139</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException();
<a name="140" href="#140">140</a>         }
<a name="141" href="#141">141</a>         
<a name="142" href="#142">142</a>         initialized = false;
<a name="143" href="#143">143</a>         childProducts.clear();
<a name="144" href="#144">144</a>         <strong class="jxr_keyword">try</strong> {
<a name="145" href="#145">145</a>             destroy();
<a name="146" href="#146">146</a>         } <strong class="jxr_keyword">catch</strong> (Exception e2) {
<a name="147" href="#147">147</a>             log.warn(<span class="jxr_string">"Failed to destroy a decoding state machine."</span>, e2);
<a name="148" href="#148">148</a>         }
<a name="149" href="#149">149</a>     }
<a name="150" href="#150">150</a> 
<a name="151" href="#151">151</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> getCurrentState() <strong class="jxr_keyword">throws</strong> Exception {
<a name="152" href="#152">152</a>         <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> state = <strong class="jxr_keyword">this</strong>.currentState;
<a name="153" href="#153">153</a>         <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {
<a name="154" href="#154">154</a>             state = init();
<a name="155" href="#155">155</a>             initialized = <strong class="jxr_keyword">true</strong>;
<a name="156" href="#156">156</a>         }
<a name="157" href="#157">157</a>         <strong class="jxr_keyword">return</strong> state;
<a name="158" href="#158">158</a>     }
<a name="159" href="#159">159</a> }
</pre>
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