org.gridgain.grid.persistentstore.snapshot.file

Class DeleteFileVisitor

java.lang.Object

java.nio.file.SimpleFileVisitor<Path>

org.gridgain.grid.persistentstore.snapshot.file.DeleteFileVisitor

All Implemented Interfaces:

FileVisitor<Path>

public class DeleteFileVisitor
extends SimpleFileVisitor<Path>

File visitor which recursively removes files in directory. Honors SnapshotOperationContext isCancelled to interrupt work.

The tree can change while it is being walked, so an entry that is already gone by the time it is visited is not an error: the goal state for it has been reached. An entry that is still there and cannot be removed is an error and is reported to the caller. A directory that could not be emptied, either because entries appeared in it after it was walked or because listing it failed, is reported through incompleteDir(), and the caller decides whether to walk the tree again.

Constructor Summary

Constructors

Constructor and Description
DeleteFileVisitor(org.gridgain.grid.internal.processors.cache.database.snapshot.SnapshotOperationContext ctx, IgniteLogger log, Path root, Set<String> skipInRoot)

Method Summary

Modifier and Type	Method and Description
@Nullable Path	incompleteDir()
FileVisitResult	postVisitDirectory(Path dir, IOException exc)
FileVisitResult	visitFile(Path file, BasicFileAttributes attrs)
FileVisitResult	visitFileFailed(Path file, IOException exc)

Methods inherited from class java.nio.file.SimpleFileVisitor

preVisitDirectory

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DeleteFileVisitor

public DeleteFileVisitor(org.gridgain.grid.internal.processors.cache.database.snapshot.SnapshotOperationContext ctx,
                         IgniteLogger log,
                         Path root,
                         Set<String> skipInRoot)

Parameters:

ctx - Progress context.

log - Logger.

root - Root of the walked tree.

skipInRoot - Names to keep in the root of the tree.

Method Detail

visitFile

public FileVisitResult visitFile(Path file,
                                 BasicFileAttributes attrs)
                          throws IOException

Specified by:

visitFile in interface FileVisitor<Path>

Overrides:

visitFile in class SimpleFileVisitor<Path>

Throws:

IOException

visitFileFailed

public FileVisitResult visitFileFailed(Path file,
                                       IOException exc)
                                throws IOException

Specified by:

visitFileFailed in interface FileVisitor<Path>

Overrides:

visitFileFailed in class SimpleFileVisitor<Path>

Throws:

IOException

postVisitDirectory

public FileVisitResult postVisitDirectory(Path dir,
                                          IOException exc)
                                   throws IOException

Specified by:

postVisitDirectory in interface FileVisitor<Path>

Overrides:

postVisitDirectory in class SimpleFileVisitor<Path>

Throws:

IOException

incompleteDir

@Nullable
public @Nullable Path incompleteDir()

Returns:

First directory that could not be emptied, or null if the whole tree was emptied.