nativefslockfactory.html
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NativeFSLockFactory (Lucene 2.1.0 API)
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SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_org.apache.lucene.store.LockFactory">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.apache.lucene.store</FONT>
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Class NativeFSLockFactory</H2>
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<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../org/apache/lucene/store/LockFactory.html" title="class in org.apache.lucene.store">org.apache.lucene.store.LockFactory</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>org.apache.lucene.store.NativeFSLockFactory</B>
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<DT>public class <B>NativeFSLockFactory</B><DT>extends <A HREF="../../../../org/apache/lucene/store/LockFactory.html" title="class in org.apache.lucene.store">LockFactory</A></DL>
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Implements <A HREF="../../../../org/apache/lucene/store/LockFactory.html" title="class in org.apache.lucene.store"><CODE>LockFactory</CODE></A> using native OS file locks (available through java.nio.*). Note that for certain filesystems native locks are possible but must be explicity configured and enabled (and may be disabled by default). For example, for NFS servers there sometimes must be a separate lockd process running, and other configuration may be required such as running the server in kernel mode. Other filesystems may not even support native OS locks in which case you must use a different <A HREF="../../../../org/apache/lucene/store/LockFactory.html" title="class in org.apache.lucene.store"><CODE>LockFactory</CODE></A> implementation. <p>The advantage of this lock factory over <A HREF="../../../../org/apache/lucene/store/SimpleFSLockFactory.html" title="class in org.apache.lucene.store"><CODE>SimpleFSLockFactory</CODE></A> is that the locks should be "correct", whereas <A HREF="../../../../org/apache/lucene/store/SimpleFSLockFactory.html" title="class in org.apache.lucene.store"><CODE>SimpleFSLockFactory</CODE></A> uses java.io.File.createNewFile which <a target="_top" href="http://java.sun.com/j2se/1.4.2/docs/api/java/io/File.html#createNewFile()">has warnings</a> about not using it for locking. Furthermore, if the JVM crashes, the OS will free any held locks, whereas <A HREF="../../../../org/apache/lucene/store/SimpleFSLockFactory.html" title="class in org.apache.lucene.store"><CODE>SimpleFSLockFactory</CODE></A> will keep the locks held, requiring manual removal before re-running Lucene.</p> <p>Note that, unlike <A HREF="../../../../org/apache/lucene/store/SimpleFSLockFactory.html" title="class in org.apache.lucene.store"><CODE>SimpleFSLockFactory</CODE></A>, the existence of leftover lock files in the filesystem on exiting the JVM is fine because the OS will free the locks held against these files even though the files still remain.</p> <p>Native locks file names have the substring "-n-", which you can use to differentiate them from lock files created by <A HREF="../../../../org/apache/lucene/store/SimpleFSLockFactory.html" title="class in org.apache.lucene.store"><CODE>SimpleFSLockFactory</CODE></A>.</p>
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<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/lucene/store/LockFactory.html" title="class in org.apache.lucene.store"><CODE>LockFactory</CODE></A></DL>
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<TD><B>Fields inherited from class org.apache.lucene.store.<A HREF="../../../../org/apache/lucene/store/LockFactory.html" title="class in org.apache.lucene.store">LockFactory</A></B></TD>
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<TD><CODE><A HREF="../../../../org/apache/lucene/store/LockFactory.html#lockPrefix">lockPrefix</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../org/apache/lucene/store/NativeFSLockFactory.html#NativeFSLockFactory(java.io.File)">NativeFSLockFactory</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/File.html" title="class or interface in java.io">File</A> lockDir)</CODE>
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Create a NativeFSLockFactory instance, storing lock files into the specified lockDir:</TD>
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<TD><CODE><B><A HREF="../../../../org/apache/lucene/store/NativeFSLockFactory.html#NativeFSLockFactory(java.lang.String)">NativeFSLockFactory</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> lockDirName)</CODE>
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Create a NativeFSLockFactory instance, storing lock files into the specified lockDirName:</TD>
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