<!DOCTYPE html> <html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> <title>class CacheManager - TeensyMUD 3.0.0 Mud Server</title> <link type="text/css" media="screen" href="./rdoc.css" rel="stylesheet"> <script type="text/javascript"> var rdoc_rel_prefix = "./"; </script> <script type="text/javascript" charset="utf-8" src="./js/jquery.js"></script> <script type="text/javascript" charset="utf-8" src="./js/navigation.js"></script> <script type="text/javascript" charset="utf-8" src="./js/search_index.js"></script> <script type="text/javascript" charset="utf-8" src="./js/search.js"></script> <script type="text/javascript" charset="utf-8" src="./js/searcher.js"></script> <script type="text/javascript" charset="utf-8" src="./js/darkfish.js"></script> <body id="top" class="class"> <nav id="metadata"> <nav id="home-section" class="section"> <h3 class="section-header"> <a href="./index.html">Home</a> <a href="./table_of_contents.html#classes">Classes</a> <a 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href="./Session.html">Session</a> <li><a href="./SockIO.html">SockIO</a> <li><a href="./Sqlite3Store.html">Sqlite3Store</a> <li><a href="./SqliteStore.html">SqliteStore</a> <li><a href="./Store.html">Store</a> <li><a href="./String.html">String</a> <li><a href="./TelnetCodes.html">TelnetCodes</a> <li><a href="./TelnetFilter.html">TelnetFilter</a> <li><a href="./TerminalFilter.html">TerminalFilter</a> <li><a href="./Timer.html">Timer</a> <li><a href="./Utility.html">Utility</a> <li><a href="./VT100Codes.html">VT100Codes</a> <li><a href="./World.html">World</a> <li><a href="./XmlStore.html">XmlStore</a> <li><a href="./YamlStore.html">YamlStore</a> </ul> </nav> </div> </nav> <div id="documentation"> <h1 class="class">class CacheManager</h1> <div id="description" class="description"> <p>This class manages the cache. It is initialized by the <a href="Store.html">Store</a> and front ends the database behind the <a href="Store.html">Store</a>.</p> </div><!-- description --> <section id="5Buntitled-5D" class="documentation-section"> <!-- Methods --> <section id="public-class-5Buntitled-5D-method-details" class="method-section section"> <h3 class="section-header">Public Class Methods</h3> <div id="method-c-new" class="method-detail "> <div class="method-heading"> <span class="method-name">new</span><span class="method-args">(db)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <div class="method-source-code" id="new-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 112</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>(<span class="ruby-identifier">db</span>) <span class="ruby-ivar">@cwidth</span> = <span class="ruby-identifier">options</span>[<span class="ruby-string">'cache_width'</span>] <span class="ruby-ivar">@cdepth</span> = <span class="ruby-identifier">options</span>[<span class="ruby-string">'cache_depth'</span>] <span class="ruby-ivar">@db</span> = <span class="ruby-identifier">db</span> <span class="ruby-ivar">@st</span> = <span class="ruby-constant">CacheStats</span>.<span class="ruby-identifier">new</span> <span class="ruby-ivar">@cache</span> = <span class="ruby-constant">Array</span>.<span class="ruby-identifier">new</span>(<span class="ruby-ivar">@cwidth</span>) {<span class="ruby-constant">Array</span>.<span class="ruby-identifier">new</span>} <span class="ruby-ivar">@cwidth</span>.<span class="ruby-identifier">times</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cdepth</span>.<span class="ruby-identifier">times</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">j</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">i</span>] <span class="ruby-operator"><<</span> <span class="ruby-constant">CacheEntry</span>.<span class="ruby-identifier">new</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_size</span>) <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span></pre> </div><!-- new-source --> </div> </div><!-- new-method --> </section><!-- public-class-method-details --> <section id="public-instance-5Buntitled-5D-method-details" class="method-section section"> <h3 class="section-header">Public Instance Methods</h3> <div id="method-i-delete" class="method-detail "> <div class="method-heading"> <span class="method-name">delete</span><span class="method-args">(oid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>delete an object</p> <div class="method-source-code" id="delete-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 254</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">delete</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">oid</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:deletes</span>) <span class="ruby-identifier">hv</span> = <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-comment"># mark dead in cache </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">oid</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">mark_dead</span> <span class="ruby-keyword">break</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># delete it from the database </span> <span class="ruby-ivar">@db</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span>) <span class="ruby-keyword">end</span></pre> </div><!-- delete-source --> </div> </div><!-- delete-method --> <div id="method-i-get" class="method-detail "> <div class="method-heading"> <span class="method-name">get</span><span class="method-args">(oid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>gets an object</p> <dl class="rdoc-list label-list"><dt><code>oid</code> <dd><ul><li> <p>integer object id to retrieve</p> </li></ul> </dd><dt><code>return</code> <dd><ul><li> <p>a reference to the object or nil if none exists</p> </li></ul> </dd></dl> <div class="method-source-code" id="get-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 151</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">get</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">oid</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:reads</span>) <span class="ruby-identifier">hv</span> = <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-comment"># search the cache </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">oid</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_read_hits</span>) <span class="ruby-comment"># need to try putting hot hit to the head of the list? </span> <span class="ruby-keyword">return</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">obj</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># cache miss - search the database </span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@db</span>.<span class="ruby-identifier">has_key?</span> <span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span> <span class="ruby-identifier">ret</span> = <span class="ruby-constant">Utility</span>.<span class="ruby-identifier">decode</span>(<span class="ruby-ivar">@db</span>[<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span>]) <span class="ruby-keyword">else</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:database_read_fails</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">end</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:database_reads</span>) <span class="ruby-comment"># get and remove the last entry off this list </span> <span class="ruby-identifier">ch</span> = <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">pop</span> <span class="ruby-comment"># if its dirty we write it to the database </span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">dirty?</span> <span class="ruby-operator">&&</span> <span class="ruby-operator">!</span><span class="ruby-identifier">ch</span>.<span class="ruby-identifier">dead?</span> <span class="ruby-ivar">@db</span>[<span class="ruby-identifier">ch</span>.<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-constant">Utility</span>.<span class="ruby-identifier">encode</span>(<span class="ruby-identifier">ch</span>.<span class="ruby-identifier">obj</span>) <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:database_writes</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">noswap?</span> <span class="ruby-comment"># here we have a problem we can't use this </span> <span class="ruby-comment"># first push it back onto the list </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">unshift</span> <span class="ruby-identifier">ch</span> <span class="ruby-comment"># get ourselves a brand new </span> <span class="ruby-identifier">ch</span> = <span class="ruby-constant">CacheEntry</span>.<span class="ruby-identifier">new</span> <span class="ruby-comment"># problem solved </span> <span class="ruby-comment"># the depth of any list chains will be cache_depth + # noswap entries </span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># assign our new object to the cache entry </span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">obj</span> = <span class="ruby-identifier">ret</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">oid</span> = <span class="ruby-identifier">oid</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">clean!</span> <span class="ruby-comment"># push it to the head of the list </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">unshift</span> <span class="ruby-identifier">ch</span> <span class="ruby-identifier">ret</span> <span class="ruby-keyword">end</span></pre> </div><!-- get-source --> </div> </div><!-- get-method --> <div id="method-i-hash" class="method-detail "> <div class="method-heading"> <span class="method-name">hash</span><span class="method-args">(oid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Our simple hash algoritm. Our database keys are sequentially assigned integers, so… I don’t know what would be better.</p> <div class="method-source-code" id="hash-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 144</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-identifier">oid</span> <span class="ruby-operator">%</span> <span class="ruby-ivar">@cwidth</span> <span class="ruby-keyword">end</span></pre> </div><!-- hash-source --> </div> </div><!-- hash-method --> <div id="method-i-inspect" class="method-detail "> <div class="method-heading"> <span class="method-name">inspect</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>report on the cache map see cmd_dumpcache</p> <div class="method-source-code" id="inspect-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 130</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">inspect</span> <span class="ruby-identifier">str</span> = <span class="ruby-node">"cache width:#{@cwidth} cache depth:#{@cdepth}\n"</span> <span class="ruby-ivar">@cwidth</span>.<span class="ruby-identifier">times</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">each_with_index</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span>,<span class="ruby-identifier">j</span><span class="ruby-operator">|</span> <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dead?</span> <span class="ruby-identifier">str</span> <span class="ruby-operator"><<</span> <span class="ruby-node">"cache map [#{i}][#{j}] => "</span> <span class="ruby-identifier">str</span> <span class="ruby-operator"><<</span> <span class="ruby-node">"oid #{ce.oid} object_id #{ce.obj.object_id} dirty? #{ce.dirty?} noswap? #{ce.noswap?}\n"</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-identifier">str</span> <span class="ruby-keyword">end</span></pre> </div><!-- inspect-source --> </div> </div><!-- inspect-method --> <div id="method-i-keys" class="method-detail "> <div class="method-heading"> <span class="method-name">keys</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>This is provided to traverse the entire object chain. This thrashes the cache violently. See <a href="Store.html#method-i-each">Store#each</a>. One needs to question the design of routines that use <a href="Store.html#method-i-each">Store#each</a> above.</p> <div class="method-source-code" id="keys-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 359</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">keys</span> <span class="ruby-identifier">kys</span> = [] <span class="ruby-ivar">@cwidth</span>.<span class="ruby-identifier">times</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">each</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-identifier">kys</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-keyword">if</span> <span class="ruby-operator">!</span><span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">nil?</span> } <span class="ruby-keyword">end</span> <span class="ruby-identifier">kys</span> <span class="ruby-keyword">end</span></pre> </div><!-- keys-source --> </div> </div><!-- keys-method --> <div id="method-i-makenoswap" class="method-detail "> <div class="method-heading"> <span class="method-name">makenoswap</span><span class="method-args">(oid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Mark an object in the cache as nonswappable</p> <dl class="rdoc-list label-list"><dt><code>oid</code> <dd> <p>is the object id</p> </dd><dt><code>return</code> <dd> <p>undefined</p> </dd></dl> <div class="method-source-code" id="makenoswap-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 319</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">makenoswap</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">oid</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_noswap</span>) <span class="ruby-identifier">hv</span> = <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">oid</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">noswap!</span> <span class="ruby-keyword">return</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># This would indicate we've tried marking it noswap before we did a put. </span> <span class="ruby-comment"># A logic error </span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_noswap_misses</span>) <span class="ruby-identifier">log</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"Marking object nonswappable before put - #{oid}"</span> <span class="ruby-keyword">end</span></pre> </div><!-- makenoswap-source --> </div> </div><!-- makenoswap-method --> <div id="method-i-makeswap" class="method-detail "> <div class="method-heading"> <span class="method-name">makeswap</span><span class="method-args">(oid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>Mark an object in the cache as swappable</p> <dl class="rdoc-list label-list"><dt><code>oid</code> <dd> <p>is the object id</p> </dd><dt><code>return</code> <dd> <p>undefined</p> </dd></dl> <div class="method-source-code" id="makeswap-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 339</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">makeswap</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">oid</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_swap</span>) <span class="ruby-identifier">hv</span> = <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">oid</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">swap!</span> <span class="ruby-keyword">return</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># This would indicate we've tried marking it swap before we did a put. </span> <span class="ruby-comment"># A logic error </span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_swap_misses</span>) <span class="ruby-identifier">log</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"Marking object swappable before put - #{oid}"</span> <span class="ruby-keyword">end</span></pre> </div><!-- makeswap-source --> </div> </div><!-- makeswap-method --> <div id="method-i-mark" class="method-detail "> <div class="method-heading"> <span class="method-name">mark</span><span class="method-args">(oid)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>deliberately mark an object in the cache as dirty see properties.</p> <div class="method-source-code" id="mark-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 271</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">mark</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">oid</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_marks</span>) <span class="ruby-identifier">hv</span> = <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">oid</span>) <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">oid</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dirty!</span> <span class="ruby-keyword">return</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># this would indicate we've tried marking it dirty before we did a put. </span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_mark_misses</span>) <span class="ruby-identifier">log</span>.<span class="ruby-identifier">debug</span> <span class="ruby-node">"Marking object dirty before put - #{oid}"</span> <span class="ruby-keyword">end</span></pre> </div><!-- mark-source --> </div> </div><!-- mark-method --> <div id="method-i-put" class="method-detail "> <div class="method-heading"> <span class="method-name">put</span><span class="method-args">(obj)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>puts an object</p> <dl class="rdoc-list label-list"><dt><code>obj</code> <dd><ul><li> <p>The integer object id to retrieve</p> </li></ul> </dd><dt><code>return</code> <dd><ul><li> <p>undefined</p> </li></ul> </dd></dl> <div class="method-source-code" id="put-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 203</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">put</span>(<span class="ruby-identifier">obj</span>) <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">obj</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:writes</span>) <span class="ruby-identifier">hv</span> = <span class="ruby-identifier">hash</span>(<span class="ruby-identifier">obj</span>.<span class="ruby-identifier">id</span>) <span class="ruby-comment"># search the cache </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">obj</span>.<span class="ruby-identifier">id</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_write_hits</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dirty?</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">obj</span>.<span class="ruby-identifier">object_id</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">obj</span>.<span class="ruby-identifier">object_id</span> <span class="ruby-comment"># be safe </span> <span class="ruby-comment"># Be extra careful here. It's possible we could have two objects </span> <span class="ruby-comment"># with the same object id but with different Ruby object_ids. </span> <span class="ruby-comment"># Most likely this is a bug, but we should handle it here.. </span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">obj</span> = <span class="ruby-identifier">obj</span> <span class="ruby-identifier">log</span>.<span class="ruby-identifier">warn</span> <span class="ruby-string">"Duplicate object id's in cache!"</span> <span class="ruby-identifier">log</span>.<span class="ruby-identifier">warn</span> <span class="ruby-node">"insert - #{obj.inspect}"</span> <span class="ruby-identifier">log</span>.<span class="ruby-identifier">warn</span> <span class="ruby-node">"cache - #{obj.inspect}"</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># need to try putting hot hit to the head of the list? </span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dirty!</span> <span class="ruby-keyword">return</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># get and remove the last entry off this list </span> <span class="ruby-identifier">ch</span> = <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">pop</span> <span class="ruby-comment"># if its dirty we write it to the database </span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">dirty?</span> <span class="ruby-operator">&&</span> <span class="ruby-operator">!</span><span class="ruby-identifier">ch</span>.<span class="ruby-identifier">dead?</span> <span class="ruby-comment"># errors possible - check in store module </span> <span class="ruby-ivar">@db</span>[<span class="ruby-identifier">ch</span>.<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-constant">Utility</span>.<span class="ruby-identifier">encode</span>(<span class="ruby-identifier">ch</span>.<span class="ruby-identifier">obj</span>) <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:database_writes</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">noswap?</span> <span class="ruby-comment"># here we have a problem we can't use this </span> <span class="ruby-comment"># first push it back onto the list </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">unshift</span> <span class="ruby-identifier">ch</span> <span class="ruby-comment"># get ourselves a brand new </span> <span class="ruby-identifier">ch</span> = <span class="ruby-constant">CacheEntry</span>.<span class="ruby-identifier">new</span> <span class="ruby-comment"># problem solved </span> <span class="ruby-comment"># the depth of any list chains will be cache_depth + # noswap entries </span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-comment"># assign our new object to the cache entry </span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">obj</span> = <span class="ruby-identifier">obj</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">oid</span> = <span class="ruby-identifier">obj</span>.<span class="ruby-identifier">id</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">dirty!</span> <span class="ruby-comment"># push it to the head of the list </span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">hv</span>].<span class="ruby-identifier">unshift</span> <span class="ruby-identifier">ch</span> <span class="ruby-keyword">return</span> <span class="ruby-keyword">end</span></pre> </div><!-- put-source --> </div> </div><!-- put-method --> <div id="method-i-stats" class="method-detail "> <div class="method-heading"> <span class="method-name">stats</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>produce a report - see cmd_stats</p> <div class="method-source-code" id="stats-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 368</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">stats</span> <span class="ruby-identifier">str</span> = <span class="ruby-string">"----------* Cache Statistics *----------\n"</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">k</span>,<span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-identifier">str</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">sprintf</span>(<span class="ruby-string">"%25-25s : %d\n"</span>,<span class="ruby-identifier">k</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r_/</span>,<span class="ruby-string">' '</span>),<span class="ruby-identifier">v</span>) <span class="ruby-keyword">end</span> <span class="ruby-identifier">str</span> <span class="ruby-operator"><<</span> <span class="ruby-string">"----------* *----------\n"</span> <span class="ruby-keyword">end</span></pre> </div><!-- stats-source --> </div> </div><!-- stats-method --> <div id="method-i-sync" class="method-detail "> <div class="method-heading"> <span class="method-name">sync</span><span class="method-args">()</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>syncronize the entire cache with the database called by save.</p> <div class="method-source-code" id="sync-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 289</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">sync</span> <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:cache_syncs</span>) <span class="ruby-comment"># search the list chains for dirty objects and write them out. </span> <span class="ruby-ivar">@cwidth</span>.<span class="ruby-identifier">times</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dirty?</span> <span class="ruby-ivar">@db</span>[<span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-constant">Utility</span>.<span class="ruby-identifier">encode</span>(<span class="ruby-identifier">ce</span>.<span class="ruby-identifier">obj</span>) <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:database_writes</span>) <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">clean!</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span></pre> </div><!-- sync-source --> </div> </div><!-- sync-method --> <div id="method-i-sync_chain" class="method-detail "> <div class="method-heading"> <span class="method-name">sync_chain</span><span class="method-args">(i)</span> <span class="method-click-advice">click to toggle source</span> </div> <div class="method-description"> <p>syncronize a specific list chain not yet called but included for possible performance enhancement</p> <div class="method-source-code" id="sync_chain-source"> <pre><span class="ruby-comment"># File lib/storage/cache.rb, line 305</span> <span class="ruby-keyword">def</span> <span class="ruby-identifier">sync_chain</span>(<span class="ruby-identifier">i</span>) <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:chain_syncs</span>) <span class="ruby-ivar">@cache</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dirty?</span> <span class="ruby-ivar">@db</span>[<span class="ruby-identifier">ce</span>.<span class="ruby-identifier">oid</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-constant">Utility</span>.<span class="ruby-identifier">encode</span>(<span class="ruby-identifier">ce</span>.<span class="ruby-identifier">obj</span>) <span class="ruby-ivar">@st</span>.<span class="ruby-identifier">inc</span>(<span class="ruby-value">:database_writes</span>) <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">clean!</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span> <span class="ruby-keyword">end</span></pre> </div><!-- sync_chain-source --> </div> </div><!-- sync_chain-method --> </section><!-- public-instance-method-details --> </section><!-- 5Buntitled-5D --> </div><!-- documentation --> <footer id="validator-badges"> <p><a href="http://validator.w3.org/check/referer">[Validate]</a> <p>Generated by <a href="https://github.com/rdoc/rdoc">RDoc</a> 3.12.1. <p>Generated with the <a href="http://deveiate.org/projects/Darkfish-Rdoc/">Darkfish Rdoc Generator</a> 3. 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