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<li class="navelem"><a class="el" href="dir_a62226f9e3a6c7c5a3be455e2f87ae01.html">xrpld</a></li><li class="navelem"><a class="el" href="dir_ba3df07e81ea6c232f7f0c8823316f62.html">core</a></li> </ul>
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<div class="headertitle"><div class="title">TimeKeeper.h</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#ifndef XRPL_CORE_TIMEKEEPER_H_INCLUDED</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#define XRPL_CORE_TIMEKEEPER_H_INCLUDED</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include &lt;xrpl/basics/chrono.h&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include &lt;xrpl/beast/clock/abstract_clock.h&gt;</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/atomic.html">atomic</a>&gt;</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacexrpl.html">xrpl</a> {</div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="foldopen" id="foldopen00012" data-start="{" data-end="};">
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html"> 12</a></span><span class="keyword">class </span><a class="code hl_class" href="classxrpl_1_1TimeKeeper.html">TimeKeeper</a> : <span class="keyword">public</span> <a class="code hl_class" href="classbeast_1_1abstract__clock.html">beast::abstract_clock</a>&lt;NetClock&gt;</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span>{</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a"> 15</a></span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;std::chrono::seconds&gt;</a> <a class="code hl_variable" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">closeOffset_</a>{};</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// Adjust system_clock::time_point for NetClock epoch</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <a class="code hl_typedef" href="classbeast_1_1abstract__clock.html#a4e16832b0bdf9392c5138bbbde024d8e">time_point</a></div>
<div class="foldopen" id="foldopen00019" data-start="{" data-end="}">
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#a01a7b19af8b52771101c5ef3da103ed3"> 19</a></span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#a01a7b19af8b52771101c5ef3da103ed3">adjust</a>(std::chrono::system_clock::time_point when)</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> {</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> <span class="keywordflow">return</span> <a class="code hl_typedef" href="classbeast_1_1abstract__clock.html#a4e16832b0bdf9392c5138bbbde024d8e">time_point</a>(std::chrono::duration_cast&lt;duration&gt;(</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> when.time_since_epoch() - <a class="code hl_variable" href="namespacexrpl.html#ac78082cb00830ca7a1fb5367dec4a452">epoch_offset</a>));</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> }</div>
</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#af7035c5fc63b4d6d8d8a5a94233cc378"> 26</a></span> <span class="keyword">virtual</span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#af7035c5fc63b4d6d8d8a5a94233cc378">~TimeKeeper</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> [[nodiscard]] <a class="code hl_typedef" href="classbeast_1_1abstract__clock.html#a4e16832b0bdf9392c5138bbbde024d8e">time_point</a></div>
<div class="foldopen" id="foldopen00045" data-start="{" data-end="}">
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#a33d345a89ac0af6bae7ae2ac5eeb9f4f"> 45</a></span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#a33d345a89ac0af6bae7ae2ac5eeb9f4f">now</a>()<span class="keyword"> const override</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordflow">return</span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#a01a7b19af8b52771101c5ef3da103ed3">adjust</a>(<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/chrono/system_clock/now.html">std::chrono::system_clock::now</a>());</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> }</div>
</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> [[nodiscard]] <a class="code hl_typedef" href="classbeast_1_1abstract__clock.html#a4e16832b0bdf9392c5138bbbde024d8e">time_point</a></div>
<div class="foldopen" id="foldopen00057" data-start="{" data-end="}">
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#a596851543f3fdc3f2f03e9c71ffdf223"> 57</a></span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#a596851543f3fdc3f2f03e9c71ffdf223">closeTime</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">return</span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#a33d345a89ac0af6bae7ae2ac5eeb9f4f">now</a>() + <a class="code hl_variable" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">closeOffset_</a>.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/atomic/atomic/load.html">load</a>();</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> }</div>
</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// This may return a negative value</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> [[nodiscard]] <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/chrono/duration.html">std::chrono::seconds</a></div>
<div class="foldopen" id="foldopen00064" data-start="{" data-end="}">
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#a4455d94f2e83badb7b4d9e4203904026"> 64</a></span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#a4455d94f2e83badb7b4d9e4203904026">closeOffset</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">return</span> <a class="code hl_variable" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">closeOffset_</a>.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/atomic/atomic/load.html">load</a>();</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }</div>
</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/chrono/duration.html">std::chrono::seconds</a></div>
<div class="foldopen" id="foldopen00071" data-start="{" data-end="}">
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"><a class="line" href="classxrpl_1_1TimeKeeper.html#af81a61f5776784a3a49423cf8e8256e3"> 71</a></span> <a class="code hl_function" href="classxrpl_1_1TimeKeeper.html#af81a61f5776784a3a49423cf8e8256e3">adjustCloseTime</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/chrono/duration.html">std::chrono::seconds</a> by)</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> {</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">using namespace </span>std::chrono_literals;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="keyword">auto</span> offset = <a class="code hl_variable" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">closeOffset_</a>.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/atomic/atomic/load.html">load</a>();</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">if</span> (by == 0s &amp;&amp; offset == 0s)</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keywordflow">return</span> offset;</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// The close time adjustment is serialized externally to this</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// code. The compare/exchange only serves as a weak check and</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// should not fail. Even if it does, it&#39;s safe to simply just</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="comment">// skip the adjustment.</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <a class="code hl_variable" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">closeOffset_</a>.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/atomic/atomic/compare_exchange.html">compare_exchange_strong</a>(offset, [by, offset]() {</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// Ignore small offsets and push the close time</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// towards our wall time.</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">if</span> (by &gt; 1s)</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="keywordflow">return</span> offset + ((by + 3s) / 4);</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">if</span> (by &lt; -1s)</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">return</span> offset + ((by - 3s) / 4);</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="keywordflow">return</span> (offset * 3) / 4;</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> }());</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> <span class="keywordflow">return</span> <a class="code hl_variable" href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">closeOffset_</a>.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/atomic/atomic/load.html">load</a>();</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> }</div>
</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span>};</div>
</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span>} <span class="comment">// namespace xrpl</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="aatomic_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/atomic.html">atomic</a></div></div>
<div class="ttc" id="aclassbeast_1_1abstract__clock_html"><div class="ttname"><a href="classbeast_1_1abstract__clock.html">beast::abstract_clock</a></div><div class="ttdoc">Abstract interface to a clock.</div><div class="ttdef"><b>Definition</b> <a href="abstract__clock_8h_source.html#l00035">abstract_clock.h:36</a></div></div>
<div class="ttc" id="aclassbeast_1_1abstract__clock_html_a4e16832b0bdf9392c5138bbbde024d8e"><div class="ttname"><a href="classbeast_1_1abstract__clock.html#a4e16832b0bdf9392c5138bbbde024d8e">beast::abstract_clock&lt; NetClock &gt;::time_point</a></div><div class="ttdeci">typename Clock::time_point time_point</div><div class="ttdef"><b>Definition</b> <a href="abstract__clock_8h_source.html#l00041">abstract_clock.h:41</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html">xrpl::TimeKeeper</a></div><div class="ttdoc">Manages various times used by the server.</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00012">TimeKeeper.h:13</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_a01a7b19af8b52771101c5ef3da103ed3"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#a01a7b19af8b52771101c5ef3da103ed3">xrpl::TimeKeeper::adjust</a></div><div class="ttdeci">static constexpr time_point adjust(std::chrono::system_clock::time_point when)</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00019">TimeKeeper.h:19</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_a33d345a89ac0af6bae7ae2ac5eeb9f4f"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#a33d345a89ac0af6bae7ae2ac5eeb9f4f">xrpl::TimeKeeper::now</a></div><div class="ttdeci">time_point now() const override</div><div class="ttdoc">Returns the current time, using the server's clock.</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00045">TimeKeeper.h:45</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_a4455d94f2e83badb7b4d9e4203904026"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#a4455d94f2e83badb7b4d9e4203904026">xrpl::TimeKeeper::closeOffset</a></div><div class="ttdeci">std::chrono::seconds closeOffset() const</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00064">TimeKeeper.h:64</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_a596851543f3fdc3f2f03e9c71ffdf223"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#a596851543f3fdc3f2f03e9c71ffdf223">xrpl::TimeKeeper::closeTime</a></div><div class="ttdeci">time_point closeTime() const</div><div class="ttdoc">Returns the predicted close time, in network time.</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00057">TimeKeeper.h:57</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_a9c6497ebb62526dcc1f19e3a4d01b60a"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#a9c6497ebb62526dcc1f19e3a4d01b60a">xrpl::TimeKeeper::closeOffset_</a></div><div class="ttdeci">std::atomic&lt; std::chrono::seconds &gt; closeOffset_</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00015">TimeKeeper.h:15</a></div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_af7035c5fc63b4d6d8d8a5a94233cc378"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#af7035c5fc63b4d6d8d8a5a94233cc378">xrpl::TimeKeeper::~TimeKeeper</a></div><div class="ttdeci">virtual ~TimeKeeper()=default</div></div>
<div class="ttc" id="aclassxrpl_1_1TimeKeeper_html_af81a61f5776784a3a49423cf8e8256e3"><div class="ttname"><a href="classxrpl_1_1TimeKeeper.html#af81a61f5776784a3a49423cf8e8256e3">xrpl::TimeKeeper::adjustCloseTime</a></div><div class="ttdeci">std::chrono::seconds adjustCloseTime(std::chrono::seconds by)</div><div class="ttdoc">Adjust the close time, based on the network's view of time.</div><div class="ttdef"><b>Definition</b> <a href="TimeKeeper_8h_source.html#l00071">TimeKeeper.h:71</a></div></div>
<div class="ttc" id="acompare_exchange_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/atomic/atomic/compare_exchange.html">std::atomic::compare_exchange_strong</a></div><div class="ttdeci">T compare_exchange_strong(T... args)</div></div>
<div class="ttc" id="aduration_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/chrono/duration.html">std::chrono::seconds</a></div></div>
<div class="ttc" id="aload_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/atomic/atomic/load.html">std::atomic::load</a></div><div class="ttdeci">T load(T... args)</div></div>
<div class="ttc" id="anamespacexrpl_html"><div class="ttname"><a href="namespacexrpl.html">xrpl</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="algorithm_8h_source.html#l00006">algorithm.h:6</a></div></div>
<div class="ttc" id="anamespacexrpl_html_ac78082cb00830ca7a1fb5367dec4a452"><div class="ttname"><a href="namespacexrpl.html#ac78082cb00830ca7a1fb5367dec4a452">xrpl::epoch_offset</a></div><div class="ttdeci">static constexpr std::chrono::seconds epoch_offset</div><div class="ttdoc">Clock for measuring the network time.</div><div class="ttdef"><b>Definition</b> <a href="chrono_8h_source.html#l00036">chrono.h:36</a></div></div>
<div class="ttc" id="anow_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/chrono/system_clock/now.html">std::chrono::system_clock::now</a></div><div class="ttdeci">T now(T... args)</div></div>
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