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FileSystemReleaseFilter (Apache Hadoop HttpFS 2.0.0-alpha API)
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org.apache.hadoop.lib.servlet</FONT>
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Class FileSystemReleaseFilter</H2>
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  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.lib.servlet.FileSystemReleaseFilter</B>
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<DT><B>All Implemented Interfaces:</B> <DD>javax.servlet.Filter</DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../org/apache/hadoop/fs/http/server/HttpFSReleaseFilter.html" title="class in org.apache.hadoop.fs.http.server">HttpFSReleaseFilter</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public abstract class <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.40"><B>FileSystemReleaseFilter</B></A><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements javax.servlet.Filter</DL>
</PRE>

<P>
The <code>FileSystemReleaseFilter</code> releases back to the
 <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service a <code>FileSystem</code> instance.
 <p/>
 This filter is useful in situations where a servlet request
 is streaming out HDFS data and the corresponding filesystem
 instance have to be closed after the streaming completes.
<P>

<P>
<HR>

<P>

<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#FileSystemReleaseFilter()">FileSystemReleaseFilter</A></B>()</CODE>

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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#destroy()">destroy</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Destroys the filter.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)">doFilter</A></B>(javax.servlet.ServletRequest&nbsp;servletRequest,
                 javax.servlet.ServletResponse&nbsp;servletResponse,
                 javax.servlet.FilterChain&nbsp;filterChain)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;It delegates the incoming request to the <code>FilterChain</code>, and
 at its completion (in a finally block) releases the filesystem instance
 back to the <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected abstract &nbsp;<A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#getFileSystemAccess()">getFileSystemAccess</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Abstract method to be implemetned by concrete implementations of the
 filter that return the <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service to which the filesystem
 will be returned to.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#init(javax.servlet.FilterConfig)">init</A></B>(javax.servlet.FilterConfig&nbsp;filterConfig)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes the filter.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#setFileSystem(org.apache.hadoop.fs.FileSystem)">setFileSystem</A></B>(org.apache.hadoop.fs.FileSystem&nbsp;fs)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Static method that sets the <code>FileSystem</code> to release back to
 the <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service on servlet request completion.</TD>
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<A NAME="FileSystemReleaseFilter()"><!-- --></A><H3>
FileSystemReleaseFilter</H3>
<PRE>
public <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.40"><B>FileSystemReleaseFilter</B></A>()</PRE>
<DL>
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<A NAME="init(javax.servlet.FilterConfig)"><!-- --></A><H3>
init</H3>
<PRE>
public void <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.53"><B>init</B></A>(javax.servlet.FilterConfig&nbsp;filterConfig)
          throws javax.servlet.ServletException</PRE>
<DL>
<DD>Initializes the filter.
 <p/>
 This implementation is a NOP.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>init</CODE> in interface <CODE>javax.servlet.Filter</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filterConfig</CODE> - filter configuration.
<DT><B>Throws:</B>
<DD><CODE>javax.servlet.ServletException</CODE> - thrown if the filter could not be initialized.</DL>
</DD>
</DL>
<HR>

<A NAME="doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)"><!-- --></A><H3>
doFilter</H3>
<PRE>
public void <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.69"><B>doFilter</B></A>(javax.servlet.ServletRequest&nbsp;servletRequest,
                     javax.servlet.ServletResponse&nbsp;servletResponse,
                     javax.servlet.FilterChain&nbsp;filterChain)
              throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A>,
                     javax.servlet.ServletException</PRE>
<DL>
<DD>It delegates the incoming request to the <code>FilterChain</code>, and
 at its completion (in a finally block) releases the filesystem instance
 back to the <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>doFilter</CODE> in interface <CODE>javax.servlet.Filter</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>servletRequest</CODE> - servlet request.<DD><CODE>servletResponse</CODE> - servlet response.<DD><CODE>filterChain</CODE> - filter chain.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE> - thrown if an IO error occurrs.
<DD><CODE>javax.servlet.ServletException</CODE> - thrown if a servet error occurrs.</DL>
</DD>
</DL>
<HR>

<A NAME="destroy()"><!-- --></A><H3>
destroy</H3>
<PRE>
public void <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.88"><B>destroy</B></A>()</PRE>
<DL>
<DD>Destroys the filter.
 <p/>
 This implementation is a NOP.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>destroy</CODE> in interface <CODE>javax.servlet.Filter</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setFileSystem(org.apache.hadoop.fs.FileSystem)"><!-- --></A><H3>
setFileSystem</H3>
<PRE>
public static void <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.97"><B>setFileSystem</B></A>(org.apache.hadoop.fs.FileSystem&nbsp;fs)</PRE>
<DL>
<DD>Static method that sets the <code>FileSystem</code> to release back to
 the <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service on servlet request completion.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>fs</CODE> - fileystem instance.</DL>
</DD>
</DL>
<HR>

<A NAME="getFileSystemAccess()"><!-- --></A><H3>
getFileSystemAccess</H3>
<PRE>
protected abstract <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service">FileSystemAccess</A> <A HREF="../../../../../src-html/org/apache/hadoop/lib/servlet/FileSystemReleaseFilter.html#line.108"><B>getFileSystemAccess</B></A>()</PRE>
<DL>
<DD>Abstract method to be implemetned by concrete implementations of the
 filter that return the <A HREF="../../../../../org/apache/hadoop/lib/service/FileSystemAccess.html" title="interface in org.apache.hadoop.lib.service"><CODE>FileSystemAccess</CODE></A> service to which the filesystem
 will be returned to.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the FileSystemAccess service.</DL>
</DD>
</DL>
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