| 1 | <!DOCTYPE html> <html> <head> <title>LogCache.coffee</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" media="all" href="docco.css" /> </head> <body> <div id="container"> <div id="background"></div> <div id="jump_to"> Jump To … <div id="jump_wrapper"> <div id="jump_page"> <a class="source" href="ByteIterable.html"> ByteIterable.coffee </a> <a class="source" href="ByteIterator.html"> ByteIterator.coffee </a> <a class="source" href="ArrayByteIterable.html"> ArrayByteIterable.coffee </a> <a class="source" href="ByteIterableBase.html"> ByteIterableBase.coffee </a> <a class="source" href="ByteIterableUtil.html"> ByteIterableUtil.coffee </a> <a class="source" href="LightOutputStream.html"> LightOutputStream.coffee </a> <a class="source" href="StoreConfiguration.html"> StoreConfiguration.coffee </a> <a class="source" href="Reader.html"> Reader.coffee </a> <a class="source" href="Writer.html"> Writer.coffee </a> <a class="source" href="List.html"> List.coffee </a> <a class="source" href="ListNode.html"> ListNode.coffee </a> <a class="source" href="Cursor.html"> Cursor.coffee </a> <a class="source" href="DatabaseRoot.html"> DatabaseRoot.coffee </a> <a class="source" href="Environment.html"> Environment.coffee </a> <a class="source" href="EnvironmentConfig.html"> EnvironmentConfig.coffee </a> <a class="source" href="Store.html"> Store.coffee </a> <a class="source" href="Transaction.html"> Transaction.coffee </a> <a class="source" href="Addr64.html"> Addr64.coffee </a> <a class="source" href="DataIterator.html"> DataIterator.coffee </a> <a class="source" href="Log.html"> Log.coffee </a> <a class="source" href="LogCache.html"> LogCache.coffee </a> <a class="source" href="LogConfig.html"> LogConfig.coffee </a> <a class="source" href="LogUtil.html"> LogUtil.coffee </a> <a class="source" href="Loggable.html"> Loggable.coffee </a> <a class="source" href="LoggableFactory.html"> LoggableFactory.coffee </a> <a class="source" href="LoggableIterator.html"> LoggableIterator.coffee </a> <a class="source" href="LoggableToWrite.html"> LoggableToWrite.coffee </a> <a class="source" href="NullLoggable.html"> NullLoggable.coffee </a> <a class="source" href="RandomAccessByteIterable.html"> RandomAccessByteIterable.coffee </a> <a class="source" href="RandomAccessLoggable.html"> RandomAccessLoggable.coffee </a> <a class="source" href="RandomAccessLoggableIterator.html"> RandomAccessLoggableIterator.coffee </a> <a class="source" href="StackList.html"> StackList.coffee </a> <a class="source" href="CompoundByteIterable.html"> CompoundByteIterable.coffee </a> <a class="source" href="CompoundByteIteratorBase.html"> CompoundByteIteratorBase.coffee </a> <a class="source" href="CompressedUnsignedLongByteIterable.html"> CompressedUnsignedLongByteIterable.coffee </a> <a class="source" href="FixedLengthByteIterable.html"> FixedLengthByteIterable.coffee </a> </div> </div> </div> <table cellpadding="0" cellspacing="0"> <thead> <tr> <th class="docs"> <h1> LogCache.coffee </h1> </th> <th class="code"> </th> </tr> </thead> <tbody> <tr id="section-1"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-1">¶</a> </div> </td> <td class="code"> <div class="highlight"><pre><span class="nv">fs = </span><span class="nx">require</span> <span class="s1">'fs'</span>
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| 2 | <span class="nv">Addr64 = </span><span class="p">(</span><span class="nx">require</span> <span class="s1">'./Addr64.coffee'</span><span class="p">).</span><span class="nx">Addr64</span>
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| 3 | <span class="nv">LogUtil = </span><span class="p">(</span><span class="nx">require</span> <span class="s1">'./LogUtil.coffee'</span><span class="p">).</span><span class="nx">LogUtil</span>
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| 4 | <span class="nv">StackList = </span><span class="p">(</span><span class="nx">require</span> <span class="s1">'./StackList.coffee'</span><span class="p">).</span><span class="nx">StackList</span>
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| 5 | <span class="nv">EventEmitter = </span><span class="p">(</span><span class="nx">require</span> <span class="s1">'events'</span><span class="p">).</span><span class="nx">EventEmitter</span></pre></div> </td> </tr> <tr id="section-2"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-2">¶</a> </div> <p>This class provides cache for reading data from disk. It is connected with
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| 6 | some directory on disk that contains files that all but one have fixed size.
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| 7 | Every file contain several pages of fixed size. Cache provides rapid access
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| 8 | to often asked pages and slow access for rearly used pages. Page size is
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| 9 | expected to be less or equal to file size. Cache is used by Log for reading
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| 10 | data.</p> </td> <td class="code"> <div class="highlight"><pre><span class="k">class</span> <span class="nx">LogCache</span> <span class="k">extends</span> <span class="nx">EventEmitter</span>
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| 11 | <span class="vi">@MINIMUM_PAGE_SIZE: </span><span class="nx">LogUtil</span><span class="p">.</span><span class="nx">LOG_BLOCK_ALIGNMENT</span>
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| 12 | <span class="vi">@DEFAULT_OPEN_FILES_COUNT: </span><span class="mi">16</span>
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| 13 | <span class="vi">@MINIMUM_MEM_USAGE_PERCENT: </span><span class="mi">5</span>
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| 14 | <span class="vi">@MAXIMUM_MEM_USAGE_PERCENT: </span><span class="mi">95</span></pre></div> </td> </tr> <tr id="section-3"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-3">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">directory: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-4"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-4">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">fileSize: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-5"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-5">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">fileMask: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-6"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-6">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">fileOffset: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-7"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-7">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">fileAddr: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-8"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-8">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pageSize: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-9"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-9">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pageMask: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-10"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-10">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pageOffset: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-11"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-11">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pageAddr: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-12"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-12">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pages: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-13"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-13">¶</a> </div> <p>@private</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pageRequests: </span><span class="kc">undefined</span></pre></div> </td> </tr> <tr id="section-14"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-14">¶</a> </div> <p>Constructor.</p>
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| 15 |
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| 16 | <p>@param directory the directory with log files.
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| 17 | @param logFileSize the logarithm of file size.
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| 18 | @param logPageSize the logarithm of page size.
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| 19 | @param maxNumberOfPages maximum number of pages to be stored in cache.
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| 20 | PageRequests[key] contains true of the page that starts with addr "key" was
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| 21 | requested recently and is waited to be read from disk (or is already in
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| 22 | cache); othrewise it is undefined.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">@create$String$int$int</span><span class="nv">$int: </span><span class="nf">(directory, fileSize, pageSize, maxNumberOfPages, o) -></span>
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| 23 | <span class="k">if</span> <span class="o">!</span><span class="nx">o</span><span class="o">?</span> <span class="k">then</span> <span class="nv">o = </span><span class="k">new</span> <span class="nx">LogCache</span>
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| 24 | <span class="nv">o.directory = </span><span class="nx">directory</span>
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| 25 | <span class="nv">o.fileSize = </span><span class="nx">fileSize</span>
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| 26 | <span class="nv">o.pageSize = </span><span class="nx">pageSize</span>
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| 27 | <span class="nv">o.fileMask = </span><span class="nx">Addr64</span><span class="p">.</span><span class="nx">create$int$int</span> <span class="mi">0</span><span class="p">,</span> <span class="p">(</span><span class="nx">o</span><span class="p">.</span><span class="nx">fileSize</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
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| 28 | <span class="nv">o.pageMask = </span><span class="nx">Addr64</span><span class="p">.</span><span class="nx">create$int$int</span> <span class="mi">0</span><span class="p">,</span> <span class="p">(</span><span class="nx">o</span><span class="p">.</span><span class="nx">pageSize</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
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| 29 | <span class="nv">o.pages = </span><span class="k">new</span> <span class="nx">StackList</span> <span class="nx">maxNumberOfPages</span>
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| 30 | <span class="nv">o.pageRequests = </span><span class="k">new</span> <span class="nb">Object</span><span class="p">()</span>
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| 31 | <span class="k">return</span> <span class="nx">o</span>
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| 32 |
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| 33 | <span class="nv">getFileMask: </span><span class="nf">() -></span>
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| 34 | <span class="k">return</span> <span class="nx">@fileMask</span>
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| 35 |
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| 36 | <span class="nv">getPageMask: </span><span class="nf">() -></span>
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| 37 | <span class="k">return</span> <span class="nx">@pageMask</span>
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| 38 |
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| 39 | <span class="nv">getPageSize: </span><span class="nf">() -></span>
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| 40 | <span class="k">return</span> <span class="nx">@pageSize</span>
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| 41 |
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| 42 | <span class="nv">getPageAddr: </span><span class="nf">() -></span>
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| 43 | <span class="k">return</span> <span class="nx">@pageAddr</span>
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| 44 |
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| 45 | <span class="nv">getPageOffset: </span><span class="nf">() -></span>
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| 46 | <span class="k">return</span> <span class="nx">@pageOffset</span>
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| 47 |
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| 48 | <span class="nv">getHighAddress: </span><span class="nf">() -></span>
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| 49 | <span class="k">return</span> <span class="nx">LogUtil</span><span class="p">.</span><span class="nx">getHighAddress$String</span> <span class="nx">@directory</span></pre></div> </td> </tr> <tr id="section-15"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-15">¶</a> </div> <p>Get all information about page from any addr inside it. PageAddr and
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| 50 | fileAddr contain addrs of the beginning of file (which is used to determine
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| 51 | file name - fn) and page (which is used to determine page name). PageOffset
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| 52 | is an offset inside page, and fileOffset is the position where this page
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| 53 | begins in this file.</p>
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| 54 |
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| 55 | <p>@param addr address inside cache page.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">parseAddr</span><span class="nv">$Addr64: </span><span class="nf">(addr) -></span>
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| 56 | <span class="vi">@pageOffset = </span><span class="nx">addr</span><span class="p">.</span><span class="nx">logAnd$Addr64</span><span class="p">(</span><span class="nx">@pageMask</span><span class="p">).</span><span class="nx">toFloat</span><span class="p">()</span>
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| 57 | <span class="vi">@pageAddr = </span><span class="nx">addr</span><span class="p">.</span><span class="nx">plus$int</span><span class="p">(</span><span class="o">-</span><span class="nx">@pageOffset</span><span class="p">)</span>
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| 58 | <span class="vi">@fileOffset = </span><span class="nx">addr</span><span class="p">.</span><span class="nx">logAnd$Addr64</span><span class="p">(</span><span class="nx">@fileMask</span><span class="p">).</span><span class="nx">toFloat</span><span class="p">()</span>
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| 59 | <span class="vi">@fileAddr = </span><span class="nx">addr</span><span class="p">.</span><span class="nx">plus$int</span><span class="p">(</span><span class="o">-</span><span class="nx">@fileOffset</span><span class="p">)</span>
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| 60 | <span class="nx">@fileOffset</span> <span class="o">-=</span> <span class="nx">@pageOffset</span>
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| 61 | <span class="vi">@fn = </span><span class="nx">@directory</span> <span class="o">+</span> <span class="nx">LogUtil</span><span class="p">.</span><span class="nx">getLogFilename$Addr64</span> <span class="nx">@fileAddr</span></pre></div> </td> </tr> <tr id="section-16"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-16">¶</a> </div> <p>Get page that is next after page with this addr inside it.</p>
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| 62 |
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| 63 | <p>@param addr address inside cache page.
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| 64 | @return page (Buffer) or undefined if page is not in cache. If undefined
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| 65 | is returned, 'getPageXXX' is emitted, where XXX is page addr.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">getNextPage$Addr64</span><span class="nv">$emit: </span><span class="nf">(addr) -></span>
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| 66 | <span class="nv">addr = </span><span class="nx">addr</span><span class="p">.</span><span class="nx">plus$int</span> <span class="nx">@pageSize</span>
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| 67 | <span class="k">return</span> <span class="nx">@getPage$Addr64$emit</span> <span class="nx">addr</span></pre></div> </td> </tr> <tr id="section-17"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-17">¶</a> </div> <p>Get page with this addr inside it.</p>
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| 68 |
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| 69 | <p>@param addr address inside cache page.
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| 70 | @return page (Buffer) or undefined if page is not in cache. If undefined
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| 71 | is returned, 'getPageXXX' is emitted, where XXX is page addr.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">getPage$Addr64</span><span class="nv">$emit: </span><span class="nf">(addr) -></span>
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| 72 | <span class="nx">@parseAddr$Addr64</span> <span class="nx">addr</span>
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| 73 | <span class="nv">addrStr = </span><span class="nx">Addr64</span><span class="p">.</span><span class="nx">addr64ToString$Addr64$int</span><span class="p">(</span><span class="nx">@pageAddr</span><span class="p">,</span> <span class="nx">LogUtil</span><span class="p">.</span><span class="nx">LOG_NAME_BASE</span><span class="p">)</span>
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| 74 | <span class="k">if</span> <span class="p">(</span><span class="nx">@pages</span><span class="p">.</span><span class="nx">get</span> <span class="nx">addrStr</span><span class="p">)</span> <span class="o">!=</span> <span class="kc">undefined</span>
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| 75 | <span class="nx">@pages</span><span class="p">.</span><span class="nx">moveToTop</span> <span class="nx">addrStr</span>
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| 76 | <span class="k">return</span> <span class="nx">@pages</span><span class="p">.</span><span class="nx">get</span> <span class="nx">addrStr</span>
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| 77 | <span class="k">else</span> <span class="k">if</span> <span class="nx">@pageRequests</span><span class="p">[</span><span class="nx">addrStr</span><span class="p">]</span> <span class="o">==</span> <span class="kc">undefined</span>
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| 78 | <span class="nx">@pageRequests</span><span class="p">[</span><span class="nx">addrStr</span><span class="p">]</span> <span class="o">=</span> <span class="kc">true</span>
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| 79 | <span class="nv">pageAddr = </span><span class="nx">@pageAddr</span>
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| 80 | <span class="nv">fileOffset = </span><span class="nx">@fileOffset</span>
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| 81 | <span class="nv">fileAddr = </span><span class="nx">@fileAddr</span>
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| 82 | <span class="nv">fn = </span><span class="nx">@fn</span>
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| 83 | <span class="nx">fs</span><span class="p">.</span><span class="nx">open</span> <span class="nx">fn</span><span class="p">,</span> <span class="s2">"r"</span><span class="p">,</span> <span class="s2">"0666"</span><span class="p">,</span> <span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">fd</span><span class="p">)</span> <span class="o">=></span>
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| 84 | <span class="k">throw</span> <span class="nx">err</span> <span class="k">if</span> <span class="nx">err</span>
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| 85 | <span class="nv">options = </span><span class="p">{</span><span class="nv">flags: </span><span class="s2">"r"</span><span class="p">,</span> <span class="nv">encoding: </span><span class="kc">null</span><span class="p">,</span> <span class="nv">mode: </span><span class="s2">"0666"</span><span class="p">,</span> <span class="nv">start: </span><span class="nx">fileOffset</span><span class="p">}</span>
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| 86 | <span class="nv">readStream = </span><span class="nx">fs</span><span class="p">.</span><span class="nx">createReadStream</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">options</span>
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| 87 | <span class="nv">emitGetPage = </span><span class="kc">true</span>
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| 88 | <span class="nv">bytesRead = </span><span class="mi">0</span>
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| 89 | <span class="nv">buffer = </span><span class="k">new</span> <span class="nx">Buffer</span> <span class="nx">@pageSize</span>
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| 90 | <span class="nx">readStream</span><span class="p">.</span><span class="kc">on</span> <span class="s1">'data'</span><span class="p">,</span> <span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="o">=></span>
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| 91 | <span class="k">if</span> <span class="nx">emitGetPage</span>
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| 92 | <span class="k">if</span> <span class="nx">data</span><span class="p">.</span><span class="nx">length</span> <span class="o"><</span> <span class="nx">@pageSize</span> <span class="o">-</span> <span class="nx">bytesRead</span>
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| 93 | <span class="nx">data</span><span class="p">.</span><span class="nx">copy</span> <span class="nx">buffer</span><span class="p">,</span> <span class="nx">bytesRead</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nx">data</span><span class="p">.</span><span class="nx">length</span>
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| 94 | <span class="nx">bytesRead</span> <span class="o">+=</span> <span class="nx">data</span><span class="p">.</span><span class="nx">length</span>
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| 95 | <span class="k">else</span>
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| 96 | <span class="nx">data</span><span class="p">.</span><span class="nx">copy</span> <span class="nx">buffer</span><span class="p">,</span> <span class="nx">bytesRead</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nx">@pageSize</span> <span class="o">-</span> <span class="nx">bytesRead</span>
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| 97 | <span class="nv">bytesRead = </span><span class="nx">@pageSize</span>
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| 98 | <span class="k">if</span> <span class="nx">bytesRead</span> <span class="o">==</span> <span class="nx">@pageSize</span> <span class="o">&&</span> <span class="nx">emitGetPage</span>
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| 99 | <span class="k">if</span> <span class="nx">@pages</span><span class="p">.</span><span class="nx">length</span> <span class="o">==</span> <span class="nx">@pages</span><span class="p">.</span><span class="nx">limit</span>
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| 100 | <span class="nx">@pageRequests</span><span class="p">[</span><span class="nx">@pages</span><span class="p">.</span><span class="nx">bottomKey</span><span class="p">()]</span> <span class="o">=</span> <span class="kc">undefined</span>
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| 101 | <span class="nx">@pageRequests</span><span class="p">[</span><span class="nx">addrStr</span><span class="p">]</span> <span class="o">=</span> <span class="kc">undefined</span>
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| 102 | <span class="nx">@pages</span><span class="p">.</span><span class="nx">push</span> <span class="nx">addrStr</span><span class="p">,</span> <span class="nx">buffer</span>
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| 103 | <span class="nx">@emit</span> <span class="s1">'getPage'</span> <span class="o">+</span> <span class="nx">addrStr</span><span class="p">,</span> <span class="nx">buffer</span><span class="p">,</span> <span class="nx">addrStr</span>
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| 104 | <span class="nv">emitGetPage = </span><span class="kc">false</span>
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| 105 | <span class="nx">readStream</span><span class="p">.</span><span class="kc">on</span> <span class="s1">'error'</span><span class="p">,</span> <span class="p">(</span><span class="nx">err</span><span class="p">)</span> <span class="o">=></span>
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| 106 | <span class="nx">console</span><span class="p">.</span><span class="nx">log</span> <span class="nx">err</span>
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| 107 | <span class="nx">readStream</span><span class="p">.</span><span class="kc">on</span> <span class="s1">'end'</span><span class="p">,</span> <span class="p">()</span> <span class="o">=></span>
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| 108 | <span class="k">if</span> <span class="nx">emitGetPage</span>
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| 109 | <span class="k">if</span> <span class="nx">@pages</span><span class="p">.</span><span class="nx">length</span> <span class="o">==</span> <span class="nx">@pages</span><span class="p">.</span><span class="nx">limit</span>
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| 110 | <span class="nx">@pageRequests</span><span class="p">[</span><span class="nx">@pages</span><span class="p">.</span><span class="nx">bottomKey</span><span class="p">()]</span> <span class="o">=</span> <span class="kc">undefined</span>
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| 111 | <span class="nx">@pageRequests</span><span class="p">[</span><span class="nx">addrStr</span><span class="p">]</span> <span class="o">=</span> <span class="kc">undefined</span>
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| 112 | <span class="nx">@pages</span><span class="p">.</span><span class="nx">push</span> <span class="nx">addrStr</span><span class="p">,</span> <span class="nx">buffer</span>
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| 113 | <span class="nx">@emit</span> <span class="s1">'getPage'</span> <span class="o">+</span> <span class="nx">addrStr</span><span class="p">,</span> <span class="nx">buffer</span><span class="p">,</span> <span class="nx">addrStr</span>
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| 114 | <span class="nv">emitGetPage = </span><span class="kc">false</span>
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| 115 | <span class="k">return</span> <span class="kc">undefined</span>
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| 116 | <span class="k">else</span>
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| 117 | <span class="k">return</span> <span class="kc">undefined</span>
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| 118 |
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| 119 | <span class="nv">exports.LogCache = </span><span class="nx">LogCache</span>
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| 120 |
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| 121 | </pre></div> </td> </tr> </tbody> </table> </div> </body> </html> |
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