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| <article class="content wrap" id="_content" data-uid="Lucene.Net.Search.SearcherLifetimeManager"> |
| |
| |
| <h1 id="Lucene_Net_Search_SearcherLifetimeManager" data-uid="Lucene.Net.Search.SearcherLifetimeManager" class="text-break">Class SearcherLifetimeManager |
| </h1> |
| <div class="markdown level0 summary"><p>Keeps track of current plus old <a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a>s, disposing |
| the old ones once they have timed out.</p> |
| <p>Use it like this:</p> |
| <pre><code> SearcherLifetimeManager mgr = new SearcherLifetimeManager();</code></pre> |
| |
| <p>Per search-request, if it's a "new" search request, then |
| obtain the latest searcher you have (for example, by |
| using <a class="xref" href="Lucene.Net.Search.SearcherManager.html">SearcherManager</a>), and then record this |
| searcher:</p> |
| <pre><code> // Record the current searcher, and save the returend |
| // token into user's search results (eg as a hidden |
| // HTML form field): |
| long token = mgr.Record(searcher);</code></pre> |
| |
| <p>When a follow-up search arrives, for example the user |
| clicks next page, drills down/up, etc., take the token |
| that you saved from the previous search and:</p> |
| <pre><code> // If possible, obtain the same searcher as the last |
| // search: |
| IndexSearcher searcher = mgr.Acquire(token); |
| if (searcher != null) |
| { |
| // Searcher is still here |
| try |
| { |
| // do searching... |
| } |
| finally |
| { |
| mgr.Release(searcher); |
| // Do not use searcher after this! |
| searcher = null; |
| } |
| } |
| else |
| { |
| // Searcher was pruned -- notify user session timed |
| // out, or, pull fresh searcher again |
| }</code></pre> |
| |
| <p>Finally, in a separate thread, ideally the same thread |
| that's periodically reopening your searchers, you should |
| periodically prune old searchers:</p> |
| <pre><code> mgr.Prune(new PruneByAge(600.0));</code></pre> |
| |
| <p><strong>NOTE</strong>: keeping many searchers around means |
| you'll use more resources (open files, RAM) than a single |
| searcher. However, as long as you are using |
| <a class="xref" href="Lucene.Net.Index.DirectoryReader.html#Lucene_Net_Index_DirectoryReader_OpenIfChanged_Lucene_Net_Index_DirectoryReader_">OpenIfChanged(DirectoryReader)</a>, the searchers |
| will usually share almost all segments and the added resource usage |
| is contained. When a large merge has completed, and |
| you reopen, because that is a large change, the new |
| searcher will use higher additional RAM than other |
| searchers; but large merges don't complete very often and |
| it's unlikely you'll hit two of them in your expiration |
| window. Still you should budget plenty of heap in the |
| runtime to have a good safety margin.</p> |
| </div> |
| <div class="markdown level0 conceptual"></div> |
| <div class="inheritance"> |
| <h5>Inheritance</h5> |
| <div class="level0"><span class="xref">System.Object</span></div> |
| <div class="level1"><span class="xref">SearcherLifetimeManager</span></div> |
| </div> |
| <div classs="implements"> |
| <h5>Implements</h5> |
| <div><span class="xref">System.IDisposable</span></div> |
| </div> |
| <div class="inheritedMembers"> |
| <h5>Inherited Members</h5> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object, System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetHashCode()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetType()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.MemberwiseClone()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.ToString()</span> |
| </div> |
| </div> |
| <h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.html">Lucene.Net.Search</a></h6> |
| <h6><strong>Assembly</strong>: Lucene.Net.dll</h6> |
| <h5 id="Lucene_Net_Search_SearcherLifetimeManager_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public class SearcherLifetimeManager : IDisposable</code></pre> |
| </div> |
| <h3 id="methods">Methods |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_SearcherLifetimeManager_Acquire_System_Int64_.md&value=---%0Auid%3A%20Lucene.Net.Search.SearcherLifetimeManager.Acquire(System.Int64)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/SearcherLifetimeManager.cs/#L197">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_SearcherLifetimeManager_Acquire_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Acquire*"></a> |
| <h4 id="Lucene_Net_Search_SearcherLifetimeManager_Acquire_System_Int64_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Acquire(System.Int64)">Acquire(Int64)</h4> |
| <div class="markdown level1 summary"><p>Retrieve a previously recorded <a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a>, if it |
| has not yet been closed.</p> |
| <p><strong>NOTE</strong>: this may return <code>null</code> when the |
| requested searcher has already timed out. When this |
| happens you should notify your user that their session |
| timed out and that they'll have to restart their |
| search.</p> |
| |
| <p>If this returns a non-null result, you must match |
| later call <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.html#Lucene_Net_Search_SearcherLifetimeManager_Release_Lucene_Net_Search_IndexSearcher_">Release(IndexSearcher)</a> on this searcher, best |
| from a finally clause.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual IndexSearcher Acquire(long version)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Int64</span></td> |
| <td><span class="parametername">version</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_SearcherLifetimeManager_Dispose.md&value=---%0Auid%3A%20Lucene.Net.Search.SearcherLifetimeManager.Dispose%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/SearcherLifetimeManager.cs/#L315">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_SearcherLifetimeManager_Dispose_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Dispose*"></a> |
| <h4 id="Lucene_Net_Search_SearcherLifetimeManager_Dispose" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Dispose">Dispose()</h4> |
| <div class="markdown level1 summary"><p>Close this to future searching; any searches still in |
| process in other threads won't be affected, and they |
| should still call <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.html#Lucene_Net_Search_SearcherLifetimeManager_Release_Lucene_Net_Search_IndexSearcher_">Release(IndexSearcher)</a> after they are |
| done.</p> |
| <p><p><strong>NOTE</strong>: you must ensure no other threads are |
| calling <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.html#Lucene_Net_Search_SearcherLifetimeManager_Record_Lucene_Net_Search_IndexSearcher_">Record(IndexSearcher)</a> while you call Dispose(); |
| otherwise it's possible not all searcher references |
| will be freed.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual void Dispose()</code></pre> |
| </div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_SearcherLifetimeManager_Prune_Lucene_Net_Search_SearcherLifetimeManager_IPruner_.md&value=---%0Auid%3A%20Lucene.Net.Search.SearcherLifetimeManager.Prune(Lucene.Net.Search.SearcherLifetimeManager.IPruner)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/SearcherLifetimeManager.cs/#L265">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_SearcherLifetimeManager_Prune_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Prune*"></a> |
| <h4 id="Lucene_Net_Search_SearcherLifetimeManager_Prune_Lucene_Net_Search_SearcherLifetimeManager_IPruner_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Prune(Lucene.Net.Search.SearcherLifetimeManager.IPruner)">Prune(SearcherLifetimeManager.IPruner)</h4> |
| <div class="markdown level1 summary"><p>Calls provided <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.IPruner.html">SearcherLifetimeManager.IPruner</a> to prune entries. The |
| entries are passed to the <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.IPruner.html">SearcherLifetimeManager.IPruner</a> in sorted (newest to |
| oldest <a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a>) order.</p> |
| <p><p><strong>NOTE</strong>: you must peridiocally call this, ideally |
| from the same background thread that opens new |
| searchers.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual void Prune(SearcherLifetimeManager.IPruner pruner)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.IPruner.html">SearcherLifetimeManager.IPruner</a></td> |
| <td><span class="parametername">pruner</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_SearcherLifetimeManager_Record_Lucene_Net_Search_IndexSearcher_.md&value=---%0Auid%3A%20Lucene.Net.Search.SearcherLifetimeManager.Record(Lucene.Net.Search.IndexSearcher)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/SearcherLifetimeManager.cs/#L166">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_SearcherLifetimeManager_Record_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Record*"></a> |
| <h4 id="Lucene_Net_Search_SearcherLifetimeManager_Record_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Record(Lucene.Net.Search.IndexSearcher)">Record(IndexSearcher)</h4> |
| <div class="markdown level1 summary"><p>Records that you are now using this <a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a>. |
| Always call this when you've obtained a possibly new |
| <a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a>, for example from |
| <a class="xref" href="Lucene.Net.Search.SearcherManager.html">SearcherManager</a>. It's fine if you already passed the |
| same searcher to this method before.</p> |
| <p>This returns the <span class="xref">System.Int64</span> token that you can later pass |
| to <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.html#Lucene_Net_Search_SearcherLifetimeManager_Acquire_System_Int64_">Acquire(Int64)</a> to retrieve the same <a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a>. |
| You should record this <span class="xref">System.Int64</span> token in the search results |
| sent to your user, such that if the user performs a |
| follow-on action (clicks next page, drills down, etc.) |
| the token is returned.</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual long Record(IndexSearcher searcher)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a></td> |
| <td><span class="parametername">searcher</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><span class="xref">System.Int64</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_SearcherLifetimeManager_Release_Lucene_Net_Search_IndexSearcher_.md&value=---%0Auid%3A%20Lucene.Net.Search.SearcherLifetimeManager.Release(Lucene.Net.Search.IndexSearcher)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/release/Lucene.Net_4_8_0_beta00010/src/Lucene.Net/Search/SearcherLifetimeManager.cs/#L215">View Source</a> |
| </span> |
| <a id="Lucene_Net_Search_SearcherLifetimeManager_Release_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Release*"></a> |
| <h4 id="Lucene_Net_Search_SearcherLifetimeManager_Release_Lucene_Net_Search_IndexSearcher_" data-uid="Lucene.Net.Search.SearcherLifetimeManager.Release(Lucene.Net.Search.IndexSearcher)">Release(IndexSearcher)</h4> |
| <div class="markdown level1 summary"><p>Release a searcher previously obtained from |
| <a class="xref" href="Lucene.Net.Search.SearcherLifetimeManager.html#Lucene_Net_Search_SearcherLifetimeManager_Acquire_System_Int64_">Acquire(Int64)</a>.</p> |
| <p><p><strong>NOTE</strong>: it's fine to call this after Dispose().</p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public virtual void Release(IndexSearcher s)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Search.IndexSearcher.html">IndexSearcher</a></td> |
| <td><span class="parametername">s</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h3 id="implements">Implements</h3> |
| <div> |
| <span class="xref">System.IDisposable</span> |
| </div> |
| </article> |
| </div> |
| |
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