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| <p />The <span id="cbc_2" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">create</pre></div></span> argument to the {@link | |
| #IndexWriter(Directory, Analyzer, boolean) constructor} determines | |
| whether a new index is created, or whether an existing index is | |
| opened. Note that you can open an index with <span id="cbc_3" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">create=<span class="highlight-keyword">true</span></pre></div></span> | |
| even while readers are using the index. The old readers will | |
| continue to search the "point in time" snapshot they had opened, | |
| and won't see the newly created index until they re-open. There are | |
| also {@link #IndexWriter(Directory, Analyzer) constructors} | |
| with no <span id="cbc_4" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">create</pre></div></span> argument which will create a new index | |
| if there is not already an index at the provided path and otherwise | |
| open the existing index.<p /><p />In either case, documents are added with {@link #AddDocument(Document) | |
| addDocument} and removed with {@link #DeleteDocuments(Term)} or {@link | |
| #DeleteDocuments(Query)}. A document can be updated with {@link | |
| #UpdateDocument(Term, Document) updateDocument} (which just deletes | |
| and then adds the entire document). When finished adding, deleting | |
| and updating documents, {@link #Close() close} should be called.<p /><a name="flush" /><p />These changes are buffered in memory and periodically | |
| flushed to the {@link Directory} (during the above method | |
| calls). A flush is triggered when there are enough | |
| buffered deletes (see {@link #setMaxBufferedDeleteTerms}) | |
| or enough added documents since the last flush, whichever | |
| is sooner. For the added documents, flushing is triggered | |
| either by RAM usage of the documents (see {@link | |
| #setRAMBufferSizeMB}) or the number of added documents. | |
| The default is to flush when RAM usage hits 16 MB. For | |
| best indexing speed you should flush by RAM usage with a | |
| large RAM buffer. Note that flushing just moves the | |
| internal buffered state in IndexWriter into the index, but | |
| these changes are not visible to IndexReader until either | |
| {@link #Commit()} or {@link #close} is called. A flush may | |
| also trigger one or more segment merges which by default | |
| run with a background thread so as not to block the | |
| addDocument calls (see <a href="#mergePolicy">below</a> | |
| for changing the {@link MergeScheduler}).<p /><a name="autoCommit" /><p />The optional <span id="cbc_5" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">autoCommit</pre></div></span> argument to the {@link | |
| #IndexWriter(Directory, boolean, Analyzer) constructors} | |
| controls visibility of the changes to {@link IndexReader} | |
| instances reading the same index. When this is | |
| <span id="cbc_6" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve"><span class="highlight-keyword">false</span></pre></div></span>, changes are not visible until {@link | |
| #Close()} or {@link #Commit()} is called. Note that changes will still be | |
| flushed to the {@link Directory} as new files, but are | |
| not committed (no new <span id="cbc_7" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">segments_N</pre></div></span> file is written | |
| referencing the new files, nor are the files sync'd to stable storage) | |
| until {@link #Close()} or {@link #Commit()} is called. If something | |
| goes terribly wrong (for example the JVM crashes), then | |
| the index will reflect none of the changes made since the | |
| last commit, or the starting state if commit was not called. | |
| You can also call {@link #Rollback()}, which closes the writer | |
| without committing any changes, and removes any index | |
| files that had been flushed but are now unreferenced. | |
| This mode is useful for preventing readers from refreshing | |
| at a bad time (for example after you've done all your | |
| deletes but before you've done your adds). It can also be | |
| used to implement simple single-writer transactional | |
| semantics ("all or none"). You can do a two-phase commit | |
| by calling {@link #PrepareCommit()} | |
| followed by {@link #Commit()}. This is necessary when | |
| Lucene is working with an external resource (for example, | |
| a database) and both must either commit or rollback the | |
| transaction.<p /><p />When <span id="cbc_8" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">autoCommit</pre></div></span> is <span id="cbc_9" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve"><span class="highlight-keyword">true</span></pre></div></span> then | |
| the writer will periodically commit on its own. [<b>Deprecated</b>: Note that in 3.0, IndexWriter will | |
| no longer accept autoCommit=true (it will be hardwired to | |
| false). You can always call {@link #Commit()} yourself | |
| when needed]. There is | |
| no guarantee when exactly an auto commit will occur (it | |
| used to be after every flush, but it is now after every | |
| completed merge, as of 2.4). If you want to force a | |
| commit, call {@link #Commit()}, or, close the writer. Once | |
| a commit has finished, newly opened {@link IndexReader} instances will | |
| see the changes to the index as of that commit. When | |
| running in this mode, be careful not to refresh your | |
| readers while optimize or segment merges are taking place | |
| as this can tie up substantial disk space.<p /></div><div class="summary"><p />Regardless of <span id="cbc_10" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">autoCommit</pre></div></span>, an {@link | |
| IndexReader} or {@link Lucene.Net.Search.IndexSearcher} will only see the | |
| index as of the "point in time" that it was opened. Any | |
| changes committed to the index after the reader was opened | |
| are not visible until the reader is re-opened.<p /><p />If an index will not have more documents added for a while and optimal search | |
| performance is desired, then either the full {@link #Optimize() optimize} | |
| method or partial {@link #Optimize(int)} method should be | |
| called before the index is closed.<p /><p />Opening an <span id="cbc_11" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">IndexWriter</pre></div></span> creates a lock file for the directory in use. Trying to open | |
| another <span id="cbc_12" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">IndexWriter</pre></div></span> on the same directory will lead to a | |
| {@link LockObtainFailedException}. The {@link LockObtainFailedException} | |
| is also thrown if an IndexReader on the same directory is used to delete documents | |
| from the index.<p /></div><div class="summary"><a name="deletionPolicy" /><p />Expert: <span id="cbc_13" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">IndexWriter</pre></div></span> allows an optional | |
| {@link IndexDeletionPolicy} implementation to be | |
| specified. You can use this to control when prior commits | |
| are deleted from the index. The default policy is {@link | |
| KeepOnlyLastCommitDeletionPolicy} which removes all prior | |
| commits as soon as a new commit is done (this matches | |
| behavior before 2.2). Creating your own policy can allow | |
| you to explicitly keep previous "point in time" commits | |
| alive in the index for some time, to allow readers to | |
| refresh to the new commit without having the old commit | |
| deleted out from under them. This is necessary on | |
| filesystems like NFS that do not support "delete on last | |
| close" semantics, which Lucene's "point in time" search | |
| normally relies on. <p /><a name="mergePolicy" /><p />Expert: | |
| <span id="cbc_14" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">IndexWriter</pre></div></span> allows you to separately change | |
| the {@link MergePolicy} and the {@link MergeScheduler}. | |
| The {@link MergePolicy} is invoked whenever there are | |
| changes to the segments in the index. Its role is to | |
| select which merges to do, if any, and return a {@link | |
| MergePolicy.MergeSpecification} describing the merges. It | |
| also selects merges to do for optimize(). (The default is | |
| {@link LogByteSizeMergePolicy}. Then, the {@link | |
| MergeScheduler} is invoked with the requested merges and | |
| it decides when and how to run the merges. The default is | |
| {@link ConcurrentMergeScheduler}. <p /><a name="OOME" /><p /><b>NOTE</b>: if you hit an | |
| OutOfMemoryError then IndexWriter will quietly record this | |
| fact and block all future segment commits. This is a | |
| defensive measure in case any internal state (buffered | |
| documents and deletions) were corrupted. Any subsequent | |
| calls to {@link #Commit()} will throw an | |
| IllegalStateException. The only course of action is to | |
| call {@link #Close()}, which internally will call {@link | |
| #Rollback()}, to undo any changes to the index since the | |
| last commit. If you opened the writer with autoCommit | |
| false you can also just call {@link #Rollback()} | |
| directly.<p /><a name="thread-safety" /><p /><b>NOTE</b>: {@link | |
| <span id="cbc_15" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">IndexWriter</pre></div></span>} instances are completely thread | |
| safe, meaning multiple threads can call any of its | |
| methods, concurrently. If your application requires | |
| external synchronization, you should <b>not</b> | |
| synchronize on the <span id="cbc_16" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">IndexWriter</pre></div></span> instance as | |
| this may cause deadlock; use your own (non-Lucene) objects | |
| instead. <p /></div><p /><b>Namespace:</b> <a href="4d52bcdb-050f-b66e-6d74-d7169ebc88b0.htm">Lucene.Net.Index</a><br /><b>Assembly:</b> <span sdata="assembly">Lucene.Net</span> (in Lucene.Net.dll) Version: 2.9.4.1<h1 class="heading"><span onclick="ExpandCollapse(syntaxToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(syntaxToggle, event)" tabindex="0"><img id="syntaxToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Syntax</span></h1><div id="syntaxSection" class="section" name="collapseableSection" style=""><div id="syntaxCodeBlocks" class="code"><span codeLanguage="CSharp"><table><tr><th>C#</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">class</span> <span class="identifier">IndexWriter</span> : <a href="http://msdn2.microsoft.com/en-us/library/aax125c9" target="_blank">IDisposable</a></pre></td></tr></table></span><span codeLanguage="VisualBasicDeclaration"><table><tr><th>Visual Basic</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">Public</span> <span class="keyword">Class</span> <span class="identifier">IndexWriter</span> _ | |
| <span class="keyword">Implements</span> <a href="http://msdn2.microsoft.com/en-us/library/aax125c9" target="_blank">IDisposable</a></pre></td></tr></table></span><span codeLanguage="ManagedCPlusPlus"><table><tr><th>Visual C++</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">ref class</span> <span class="identifier">IndexWriter</span> : <a href="http://msdn2.microsoft.com/en-us/library/aax125c9" target="_blank">IDisposable</a></pre></td></tr></table></span></div></div><h1 class="heading"><span onclick="ExpandCollapse(familyToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(familyToggle, event)" tabindex="0"><img id="familyToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Inheritance Hierarchy</span></h1><div id="familySection" class="section" name="collapseableSection" style=""><a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">System<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>Object</a><br /> <span class="selflink">Lucene.Net.Index<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>IndexWriter</span><br /></div><h1 class="heading"><span onclick="ExpandCollapse(seeAlsoToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(seeAlsoToggle, event)" tabindex="0"><img id="seeAlsoToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />See Also</span></h1><div id="seeAlsoSection" class="section" name="collapseableSection" style=""><div class="seeAlsoStyle"><a href="cb89eecb-5237-f34b-779c-5bedfb8104fb.htm">IndexWriter Members</a></div><div class="seeAlsoStyle"><a href="4d52bcdb-050f-b66e-6d74-d7169ebc88b0.htm">Lucene.Net.Index Namespace</a></div></div></div><div id="footer"><div class="footerLine"><img width="100%" height="3px" src="../icons/footer.gif" alt="Footer image" title="Footer image" /></div><A NAME="feedback"></A><span id="fb" class="feedbackcss"></span></div></div></body></html> |