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java.lang.Object org.apache.hadoop.lib.servlet.FileSystemReleaseFilter
@InterfaceAudience.Private public abstract class FileSystemReleaseFilter
The FileSystemReleaseFilter
releases back to the
FileSystemAccess
service a FileSystem
instance.
Constructor Summary | |
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FileSystemReleaseFilter()
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Method Summary | |
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void |
destroy()
Destroys the filter. |
void |
doFilter(javax.servlet.ServletRequest servletRequest,
javax.servlet.ServletResponse servletResponse,
javax.servlet.FilterChain filterChain)
It delegates the incoming request to the FilterChain , and
at its completion (in a finally block) releases the filesystem instance
back to the FileSystemAccess service. |
protected abstract FileSystemAccess |
getFileSystemAccess()
Abstract method to be implemetned by concrete implementations of the filter that return the FileSystemAccess service to which the filesystem
will be returned to. |
void |
init(javax.servlet.FilterConfig filterConfig)
Initializes the filter. |
static void |
setFileSystem(org.apache.hadoop.fs.FileSystem fs)
Static method that sets the FileSystem to release back to
the FileSystemAccess service on servlet request completion. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public FileSystemReleaseFilter()
Method Detail |
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public void init(javax.servlet.FilterConfig filterConfig) throws javax.servlet.ServletException
init
in interface javax.servlet.Filter
filterConfig
- filter configuration.
javax.servlet.ServletException
- thrown if the filter could not be initialized.public void doFilter(javax.servlet.ServletRequest servletRequest, javax.servlet.ServletResponse servletResponse, javax.servlet.FilterChain filterChain) throws IOException, javax.servlet.ServletException
FilterChain
, and
at its completion (in a finally block) releases the filesystem instance
back to the FileSystemAccess
service.
doFilter
in interface javax.servlet.Filter
servletRequest
- servlet request.servletResponse
- servlet response.filterChain
- filter chain.
IOException
- thrown if an IO error occurrs.
javax.servlet.ServletException
- thrown if a servet error occurrs.public void destroy()
destroy
in interface javax.servlet.Filter
public static void setFileSystem(org.apache.hadoop.fs.FileSystem fs)
FileSystem
to release back to
the FileSystemAccess
service on servlet request completion.
fs
- fileystem instance.protected abstract FileSystemAccess getFileSystemAccess()
FileSystemAccess
service to which the filesystem
will be returned to.
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