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      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Author</dt>
      <dd style="margin-left: 8.5em">YUKI Hiroshi &lt;shimo****@clear*****&gt;</dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Date</dt>
      <dd style="margin-left: 8.5em">2015-04-30 13:12:21 +0900 (Thu, 30 Apr 2015)</dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">New Revision</dt>
      <dd style="margin-left: 8.5em"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2">ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2</a></dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Message</dt>
      <dd style="margin-left: 8.5em"><pre style="border: 1px solid #aaa; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; padding: 0.5em; width: auto">Define buffered and not buffered versions as base classes</pre></dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Modified files</dt>
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        <ul>
          <li><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#diff-0">test/unit/test_engine_node.rb</a></li>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">  Modified: test/unit/test_engine_node.rb (+24 -18)</span>
<span class="diff-header-mark" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">===================================================================</span>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0L79">...</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0L82">82</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0L90">90</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0L96">96</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R84">84</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R85">85</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R86">86</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R87">87</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R88">88</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R89">89</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R90">90</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R91">91</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R92">92</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R93">93</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R94">94</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R95">95</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R96">96</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R97">97</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R98">98</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R99">99</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R100">100</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R101">101</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R102">102</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R103">103</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R104">104</a></span>
<span class="diff-line-number-nothing" style="display: block; white-space: pre">&nbsp;</span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R105">105</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R106">106</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R108">108</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R109">109</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R110">110</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R111">111</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R112">112</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R113">113</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R114">114</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R115">115</a></span>
<span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R244">...</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R245">245</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R246">246</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R247">247</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R248">248</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R249">249</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R250">250</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R251">251</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R252">252</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R253">253</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R254">254</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R255">255</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R256">256</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R257">257</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R258">258</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R259">259</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R260">260</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R261">261</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R262">262</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R263">263</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R264">264</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/ae0d6ff31e4a9e281aed09d3ff12a04f603e22c2#L0R265">265</a></span>
</pre>
            </th>
            <td class="diff-content" style="border: 1px solid #aaa">
<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -80,26 +80,36 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">class EngineNodeTest &lt; Test::Unit::TestCase</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">     assert_equal(data[:expected], json)</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  class Buffered &lt; Droonga::EngineNode</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    private</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    def create_buffer</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+      [0]</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  class NotBuffered &lt; Droonga::EngineNode</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    private</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    def create_buffer</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+      []</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+  end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-not-changed" style="display: block; white-space: pre">   class FromServiceProvider &lt; self</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-    class EngineNode &lt; Droonga::EngineNode</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    class BufferedEngineNode &lt; Buffered</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       private</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       def sender_role</span>
<span class="diff-not-changed" style="display: block; white-space: pre">         Droonga::NodeRole::SERVICE_PROVIDER</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-    class BufferedEngineNode &lt; EngineNode</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    class NotBufferedEngineNode &lt; NotBuffered</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       private</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      def create_buffer</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-        [0]</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+      def sender_role</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+        Droonga::NodeRole::SERVICE_PROVIDER</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-    class NotBufferedEngineNode &lt; EngineNode</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      private</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      def create_buffer</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-        []</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    class EngineNode &lt; NotBufferedEngineNode</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">     data(:same_role =&gt; {</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -235,25 +245,21 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">class EngineNodeTest &lt; Test::Unit::TestCase</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">   end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">   class FromAbsorbSource &lt; self</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-    class EngineNode &lt; Droonga::EngineNode</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    class BufferedEngineNode &lt; Buffered</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       private</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       def sender_role</span>
<span class="diff-not-changed" style="display: block; white-space: pre">         Droonga::NodeRole::ABSORB_SOURCE</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-    class BufferedEngineNode &lt; EngineNode</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    class NotBufferedEngineNode &lt; NotBuffered</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       private</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      def create_buffer</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-        [0]</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+      def sender_role</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+        Droonga::NodeRole::ABSORB_SOURCE</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-    class NotBufferedEngineNode &lt; EngineNode</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      private</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      def create_buffer</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-        []</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-      end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+    class EngineNode &lt; NotBufferedEngineNode</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">     data(:same_role =&gt; {</span>
</pre>
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