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<li class="navelem"><a class="el" href="dir_df9c78dcf3f59a33b12284f95992a64b.html">ripple</a></li><li class="navelem"><a class="el" href="dir_ceb6d1bc218d15504336f945ff1322da.html">nodestore</a></li> </ul>
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<div class="header">
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<div class="title">Backend.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//------------------------------------------------------------------------------</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (c) 2012, 2013 Ripple Labs Inc.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">*/</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">//==============================================================================</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef RIPPLE_NODESTORE_BACKEND_H_INCLUDED</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define RIPPLE_NODESTORE_BACKEND_H_INCLUDED</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <ripple/nodestore/Types.h></span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span><a class="code" href="namespaceripple.html">ripple</a> {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">namespace </span>NodeStore {</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classripple_1_1NodeStore_1_1Backend.html"> 37</a></span> <span class="keyword">class </span><a class="code" href="classripple_1_1NodeStore_1_1Backend.html">Backend</a></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">virtual</span> <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a7be1490e873f0a4956e4dd9effc9061b">~Backend</a>() = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">virtual</span> <a class="codeRef" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a206d540c4b8359c598f2309c5ee194bd">getName</a>() = 0;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a586356a9f6050201be9d184bc3fd2c83">open</a>(<span class="keywordtype">bool</span> createIfMissing = <span class="keyword">true</span>) = 0;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a6b13f9a9bbf0bf6470648f4910a92dd0">close</a>() = 0;</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">virtual</span> <a class="code" href="namespaceripple_1_1NodeStore.html#af127c2e4fc73b5d35647147ef45b350c">Status</a></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a7d3224e43e89dc098962b986d70e9833">fetch</a>(<span class="keywordtype">void</span> <span class="keyword">const</span>* key, <a class="codeRef" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr<NodeObject></a>* pObject) = 0;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keyword">virtual</span> <span class="keywordtype">bool</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a26ec003b54dcceb03af5de57ddb5e545">canFetchBatch</a>() = 0;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">virtual</span> <a class="codeRef" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<std::shared_ptr<NodeObject></a>></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#ae5c85e156a44b8b13040ecafab65976a">fetchBatch</a>(<a class="codeRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> n, <span class="keywordtype">void</span> <span class="keyword">const</span>* <span class="keyword">const</span>* keys) = 0;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a8862f8d96713c985c3169e57cbb260c2">store</a>(<a class="codeRef" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr<NodeObject></a> <span class="keyword">const</span>& <span class="keywordtype">object</span>) = 0;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#acb1f22b4101841e695477646c95376a7">storeBatch</a>(<a class="codeRef" href="http://en.cppreference.com/w/cpp/container/vector.html">Batch</a> <span class="keyword">const</span>& batch) = 0;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  </div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a70721d2adc758a808d2536eee864df52">for_each</a>(<a class="codeRef" href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a><<span class="keywordtype">void</span>(<a class="codeRef" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr<NodeObject></a>)> f) = 0;</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  </div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">virtual</span> <span class="keywordtype">int</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#ac4d7008b7a616ce05568da3e96a204ec">getWriteLoad</a>() = 0;</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a898be5251e9216eb21938e3083c2d1ef">setDeletePath</a>() = 0;</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#ad2c3057545b73aee8e671f127b0ae084">verify</a>() = 0;</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  </div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keyword">virtual</span> <span class="keywordtype">int</span></div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a915130d326c2e63209accb8af09cf8b4">fdRequired</a>() <span class="keyword">const</span> = 0;</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  </div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordtype">bool</span></div>
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<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="classripple_1_1NodeStore_1_1Backend.html#ab07382d1cbb7d39fe7aacdbc17654861"> 129</a></span>  <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#ab07382d1cbb7d39fe7aacdbc17654861">backed</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="keyword"> </span>{</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">return</span> <a class="code" href="classripple_1_1NodeStore_1_1Backend.html#a915130d326c2e63209accb8af09cf8b4">fdRequired</a>();</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  }</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> };</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  </div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> } <span class="comment">// namespace NodeStore</span></div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> } <span class="comment">// namespace ripple</span></div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="preprocessor">#endif</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_ab07382d1cbb7d39fe7aacdbc17654861"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#ab07382d1cbb7d39fe7aacdbc17654861">ripple::NodeStore::Backend::backed</a></div><div class="ttdeci">bool backed() const</div><div class="ttdoc">Returns true if the backend uses permanent storage.</div><div class="ttdef"><b>Definition:</b> <a href="Backend_8h_source.html#l00129">Backend.h:129</a></div></div>
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<div class="ttc" id="abasic_string_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div><div class="ttdoc">STL class.</div></div>
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<div class="ttc" id="ashared_ptr_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr< NodeObject ></a></div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_ac4d7008b7a616ce05568da3e96a204ec"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#ac4d7008b7a616ce05568da3e96a204ec">ripple::NodeStore::Backend::getWriteLoad</a></div><div class="ttdeci">virtual int getWriteLoad()=0</div><div class="ttdoc">Estimate the number of write operations pending.</div></div>
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<div class="ttc" id="avector_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a></div><div class="ttdoc">STL class.</div></div>
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<div class="ttc" id="afunction_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a></div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a8862f8d96713c985c3169e57cbb260c2"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a8862f8d96713c985c3169e57cbb260c2">ripple::NodeStore::Backend::store</a></div><div class="ttdeci">virtual void store(std::shared_ptr< NodeObject > const &object)=0</div><div class="ttdoc">Store a single object.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a6b13f9a9bbf0bf6470648f4910a92dd0"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a6b13f9a9bbf0bf6470648f4910a92dd0">ripple::NodeStore::Backend::close</a></div><div class="ttdeci">virtual void close()=0</div><div class="ttdoc">Close the backend.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a70721d2adc758a808d2536eee864df52"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a70721d2adc758a808d2536eee864df52">ripple::NodeStore::Backend::for_each</a></div><div class="ttdeci">virtual void for_each(std::function< void(std::shared_ptr< NodeObject >)> f)=0</div><div class="ttdoc">Visit every object in the database This is usually called during import.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a7be1490e873f0a4956e4dd9effc9061b"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a7be1490e873f0a4956e4dd9effc9061b">ripple::NodeStore::Backend::~Backend</a></div><div class="ttdeci">virtual ~Backend()=default</div><div class="ttdoc">Destroy the backend.</div></div>
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<div class="ttc" id="anamespaceripple_1_1NodeStore_html_af127c2e4fc73b5d35647147ef45b350c"><div class="ttname"><a href="namespaceripple_1_1NodeStore.html#af127c2e4fc73b5d35647147ef45b350c">ripple::NodeStore::Status</a></div><div class="ttdeci">Status</div><div class="ttdoc">Return codes from Backend operations.</div><div class="ttdef"><b>Definition:</b> <a href="nodestore_2Types_8h_source.html#l00044">nodestore/Types.h:44</a></div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a898be5251e9216eb21938e3083c2d1ef"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a898be5251e9216eb21938e3083c2d1ef">ripple::NodeStore::Backend::setDeletePath</a></div><div class="ttdeci">virtual void setDeletePath()=0</div><div class="ttdoc">Remove contents on disk upon destruction.</div></div>
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<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition:</b> <a href="RCLCensorshipDetector_8h_source.html#l00029">RCLCensorshipDetector.h:29</a></div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a915130d326c2e63209accb8af09cf8b4"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a915130d326c2e63209accb8af09cf8b4">ripple::NodeStore::Backend::fdRequired</a></div><div class="ttdeci">virtual int fdRequired() const =0</div><div class="ttdoc">Returns the number of file descriptors the backend expects to need.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a206d540c4b8359c598f2309c5ee194bd"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a206d540c4b8359c598f2309c5ee194bd">ripple::NodeStore::Backend::getName</a></div><div class="ttdeci">virtual std::string getName()=0</div><div class="ttdoc">Get the human-readable name of this backend.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_ae5c85e156a44b8b13040ecafab65976a"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#ae5c85e156a44b8b13040ecafab65976a">ripple::NodeStore::Backend::fetchBatch</a></div><div class="ttdeci">virtual std::vector< std::shared_ptr< NodeObject > > fetchBatch(std::size_t n, void const *const *keys)=0</div><div class="ttdoc">Fetch a batch synchronously.</div></div>
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<div class="ttc" id="asize_t_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a></div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a26ec003b54dcceb03af5de57ddb5e545"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a26ec003b54dcceb03af5de57ddb5e545">ripple::NodeStore::Backend::canFetchBatch</a></div><div class="ttdeci">virtual bool canFetchBatch()=0</div><div class="ttdoc">Return true if batch fetches are optimized.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_acb1f22b4101841e695477646c95376a7"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#acb1f22b4101841e695477646c95376a7">ripple::NodeStore::Backend::storeBatch</a></div><div class="ttdeci">virtual void storeBatch(Batch const &batch)=0</div><div class="ttdoc">Store a group of objects.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a586356a9f6050201be9d184bc3fd2c83"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a586356a9f6050201be9d184bc3fd2c83">ripple::NodeStore::Backend::open</a></div><div class="ttdeci">virtual void open(bool createIfMissing=true)=0</div><div class="ttdoc">Open the backend.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_ad2c3057545b73aee8e671f127b0ae084"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#ad2c3057545b73aee8e671f127b0ae084">ripple::NodeStore::Backend::verify</a></div><div class="ttdeci">virtual void verify()=0</div><div class="ttdoc">Perform consistency checks on database.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html_a7d3224e43e89dc098962b986d70e9833"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html#a7d3224e43e89dc098962b986d70e9833">ripple::NodeStore::Backend::fetch</a></div><div class="ttdeci">virtual Status fetch(void const *key, std::shared_ptr< NodeObject > *pObject)=0</div><div class="ttdoc">Fetch a single object.</div></div>
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<div class="ttc" id="aclassripple_1_1NodeStore_1_1Backend_html"><div class="ttname"><a href="classripple_1_1NodeStore_1_1Backend.html">ripple::NodeStore::Backend</a></div><div class="ttdoc">A backend used for the NodeStore.</div><div class="ttdef"><b>Definition:</b> <a href="Backend_8h_source.html#l00037">Backend.h:37</a></div></div>
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