<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>put (CacheManager)</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <link rel="stylesheet" href="../.././rdoc-style.css" type="text/css" media="screen" /> </head> <body class="standalone-code"> <pre><span class="ruby-comment cmt"># File lib/storage/cache.rb, line 203</span> <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">put</span>(<span class="ruby-identifier">obj</span>) <span class="ruby-keyword kw">return</span> <span class="ruby-keyword kw">nil</span> <span class="ruby-keyword kw">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-identifier">: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 cmt"># 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 kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">ce</span><span class="ruby-operator">|</span> <span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">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-identifier">:cache_write_hits</span>) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">ce</span>.<span class="ruby-identifier">dirty?</span> <span class="ruby-keyword kw">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 cmt"># be safe </span> <span class="ruby-comment cmt"># Be extra careful here. It's possible we could have two objects </span> <span class="ruby-comment cmt"># with the same object id but with different Ruby object_ids. </span> <span class="ruby-comment cmt"># 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-value str">"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 kw">end</span> <span class="ruby-comment cmt"># 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 kw">return</span> <span class="ruby-keyword kw">end</span> <span class="ruby-comment cmt"># 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 cmt"># if its dirty we write it to the database </span> <span class="ruby-keyword kw">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 cmt"># 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-identifier">:database_writes</span>) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">ch</span>.<span class="ruby-identifier">noswap?</span> <span class="ruby-comment cmt"># here we have a problem we can't use this </span> <span class="ruby-comment cmt"># 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 cmt"># 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 cmt"># problem solved </span> <span class="ruby-comment cmt"># the depth of any list chains will be cache_depth + # noswap entries </span> <span class="ruby-keyword kw">end</span> <span class="ruby-keyword kw">end</span> <span class="ruby-comment cmt"># 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 cmt"># 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 kw">return</span> <span class="ruby-keyword kw">end</span></pre> </body> </html>