Storage (Javadocs [I2P+ 2.11.0+] - API Version 0.9.68+)

java.lang.Object
- org.klomp.snark.Storage

All Implemented Interfaces:

Closeable, AutoCloseable
```
public class Storage
extends Object
implements Closeable
```
Storage manages torrent data files on disk for I2PSnark.
This class handles all aspects of storing and retrieving torrent pieces:
- Creating and managing files/directories for torrent data
- Reading and writing piece data to disk
- Tracking downloaded pieces via BitField
- Validating downloaded pieces against piece hashes
- File pre-allocation for sparse file support
- Priority-based file selection for partial downloads
- File checking and rechecking for data integrity
Storage implements Closeable and should be properly closed after use. The storage must be checked via check() before reading or writing pieces.
Thread safety: This class uses synchronized methods and concurrent collections for thread-safe access to file handles and metadata.
See Also:

MetaInfo, BitField, StorageListener

Field Summary

Fields
Modifier and Type	Field and Description
`static boolean`	`DEFAULT_PREALLOCATE_FILES` Default value for file pre-allocation (true).
`static int`	`MAX_PIECE_SIZE` Maximum permitted piece size.
`static int`	`MAX_PIECES` The maximum number of pieces allowed in a single torrent.
`static long`	`MAX_TOTAL_SIZE` Maximum total torrent size (MAX_PIECE_SIZE * MAX_PIECES).
`static int`	`PRIORITY_NORMAL` Default priority value for files.
`static int`	`PRIORITY_SKIP` Priority value indicating a file should be skipped during download.
`static String`	`PROP_PREALLOCATE_FILES` Configuration key for enabling file pre-allocation.

Constructor Summary

Constructors
Constructor and Description
`Storage(I2PSnarkUtil util, File baseFile, MetaInfo metainfo, StorageListener listener, boolean preserveFileNames)` Creates a new storage based on the supplied MetaInfo.
`Storage(I2PSnarkUtil util, File baseFile, String announce, List<List<String>> announce_list, String created_by, boolean privateTorrent, List<String> url_list, String comment, StorageListener listener, List<TorrentCreateFilter> filters)` Creates a storage from the existing file or directory.
`Storage(I2PSnarkUtil util, File baseFile, String announce, List<List<String>> announce_list, String created_by, boolean privateTorrent, StorageListener listener, List<TorrentCreateFilter> filters)` Creates a storage from the existing file or directory.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`check()` Creates (and/or checks) all files from the metainfo file list.
`void`	`check(long savedTime, BitField savedBitField)` Creates (and/or checks) all files from the metainfo file list.
`void`	`cleanRAFs()` Close unused RAFs - call periodically
`(package private) void`	`clearChanged()` Clear the storage changed variable
`void`	`close()` Closes the Storage and makes sure that all RandomAccessFiles are closed.
`boolean`	`complete()` Whether or not this storage contains all pieces if the MetaInfo.
`static String`	`filterName(String name)` Removes 'suspicious' characters from the given file name.
`long`	`getActivity()` Get the last activity timestamp.
`File`	`getBase()` The base file or directory.
`String`	`getBaseName()` The base file or directory name of the data, as specified in the .torrent file, but filtered to remove illegal characters.
`BitField`	`getBitField()` The BitField that tells which pieces this storage contains.
`double`	`getCheckingProgress()` If checking is in progress, return completion 0.0 ...
`SortedSet<File>`	`getDirectories()` Includes the base for a multi-file torrent.
`List<String>`	`getExcludedFiles(File base)`
`int`	`getFileCount()` Does not include directories.
`int[]`	`getFilePriorities()` Get the file priorities array.
`List<File>`	`getFiles()` Does not include directories.
`boolean`	`getInOrder()`
`MetaInfo`	`getMetaInfo()` Returns the MetaInfo associated with this Storage.
`ByteArray`	`getPiece(int piece, int off, int len)` Returns a byte array containing a portion of the requested piece or null if the storage doesn't contain the piece yet.
`int[]`	`getPiecePriorities()` Call setPriority() for all changed files first, then call this.
`boolean`	`getPreserveFileNames()`
`int`	`getPriority(int fileIndex)`
`long`	`getSkippedLength()` Call setPriority() for all changed files first, then call this.
`int`	`indexOf(File file)` Get index to pass to remaining(), getPriority(), setPriority()
`boolean`	`isAllocating()` Disk allocation (ballooning) in progress.
`boolean`	`isChanged()` Has the storage changed since instantiation?
`boolean`	`isChecking()` File checking in progress.
`static void`	`main(String[] args)` Create a metainfo.
`int`	`needed()` How many pieces are still missing from this storage.
`boolean`	`putPiece(PartialPiece pp)` Put the piece in the Storage if it is correct.
`boolean`	`recheck()` Blocking.
`long[]`	`remaining()` For efficiency, calculate remaining bytes for all files at once
`long[][]`	`remaining2()` For efficiency, calculate remaining bytes for all files at once.
`void`	`reopen()` Doesn't really reopen the file descriptors for a restart.
`void`	`setActivity(long time)` Set the activity timestamp.
`(package private) void`	`setFilePriorities(int[] p)` Set the file priorities array.
`void`	`setInOrder(boolean yes)` Enable or disable in-order download mode.
`void`	`setPriority(int fileIndex, int pri)` Must call Snark.updatePiecePriorities() (which calls getPiecePriorities()) after calling this.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_PREALLOCATE_FILES
```
public static final boolean DEFAULT_PREALLOCATE_FILES
```
    Default value for file pre-allocation (true).
    
    See Also:
    
    Constant Field Values
  - MAX_PIECE_SIZE
```
public static final int MAX_PIECE_SIZE
```
    Maximum permitted piece size. Torrents with pieces larger than this will be rejected.
    
    See Also:
    
    Constant Field Values
  - MAX_PIECES
```
public static final int MAX_PIECES
```
    The maximum number of pieces allowed in a single torrent.
    
    See Also:
    
    Constant Field Values
  - MAX_TOTAL_SIZE
```
public static final long MAX_TOTAL_SIZE
```
    Maximum total torrent size (MAX_PIECE_SIZE * MAX_PIECES).
    
    See Also:
    
    Constant Field Values
  - PRIORITY_NORMAL
```
public static final int PRIORITY_NORMAL
```
    Default priority value for files.
    
    See Also:
    
    Constant Field Values
  - PRIORITY_SKIP
```
public static final int PRIORITY_SKIP
```
    Priority value indicating a file should be skipped during download.
    
    See Also:
    
    Constant Field Values
  - PROP_PREALLOCATE_FILES
```
public static final String PROP_PREALLOCATE_FILES
```
    Configuration key for enabling file pre-allocation.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Storage
```
public Storage(I2PSnarkUtil util,
               File baseFile,
               MetaInfo metainfo,
               StorageListener listener,
               boolean preserveFileNames)
```
    Creates a new storage based on the supplied MetaInfo.
    Does not check storage. Caller MUST call check(), which will try to create and/or check all needed files in the MetaInfo.
    
    Parameters:
    
    baseFile - the torrent data file or dir
    
    preserveFileNames - if true, do not remap names to a 'safe' charset
  - Storage
```
public Storage(I2PSnarkUtil util,
               File baseFile,
               String announce,
               List<List<String>> announce_list,
               String created_by,
               boolean privateTorrent,
               List<String> url_list,
               String comment,
               StorageListener listener,
               List<TorrentCreateFilter> filters)
        throws IOException
```
    Creates a storage from the existing file or directory. Creates an in-memory metainfo but does not save it to a file, caller must do that.
    Creates the metainfo, this may take a LONG time. BLOCKING.
    
    Parameters:
    
    announce - may be null
    
    listener - may be null
    
    created_by - may be null
    
    url_list - may be null
    
    comment - may be null
    
    Throws:
    
    IOException - when creating and/or checking files fails.
  - Storage
```
public Storage(I2PSnarkUtil util,
               File baseFile,
               String announce,
               List<List<String>> announce_list,
               String created_by,
               boolean privateTorrent,
               StorageListener listener,
               List<TorrentCreateFilter> filters)
        throws IOException
```
    Creates a storage from the existing file or directory. Creates an in-memory metainfo but does not save it to a file, caller must do that.
    Creates the metainfo, this may take a LONG time. BLOCKING.
    
    Parameters:
    
    announce - may be null
    
    listener - may be null
    
    created_by - may be null
    
    Throws:
    
    IOException - when creating and/or checking files fails.
- Method Detail
  - check
```
public void check()
           throws IOException
```
    Creates (and/or checks) all files from the metainfo file list. Only call this once, and only after the constructor with the metainfo. Use recheck() to check again later.
    
    Throws:
    
    IllegalStateException - if called more than once
    
    IOException
  - check
```
public void check(long savedTime,
                  BitField savedBitField)
           throws IOException
```
    Creates (and/or checks) all files from the metainfo file list. Use a saved bitfield and timestamp from a config file. Only call this once, and only after the constructor with the metainfo. Use recheck() to check again later.
    
    Throws:
    
    IllegalStateException - if called more than once
    
    IOException
  - cleanRAFs
```
public void cleanRAFs()
```
    Close unused RAFs - call periodically
  - clearChanged
```
void clearChanged()
```
    Clear the storage changed variable
  - close
```
public void close()
           throws IOException
```
    Closes the Storage and makes sure that all RandomAccessFiles are closed. The Storage is unusable after this.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Throws:
    
    IOException
  - complete
```
public boolean complete()
```
    Whether or not this storage contains all pieces if the MetaInfo.
  - filterName
```
public static String filterName(String name)
```
    Removes 'suspicious' characters from the given file name. http://msdn.microsoft.com/en-us/library/aa365247%28VS.85%29.aspx Then replace chars not supported in the charset.
    This is called frequently and it can be pretty slow so cache the result.
    TODO: If multiple files in the same torrent map to the same filter name, the whole torrent will blow up. Check at torrent creation?
  - getActivity
```
public long getActivity()
```
    Get the last activity timestamp.
    
    Returns:
    
    timestamp in milliseconds since epoch, or 0 if never set
  - getBase
```
public File getBase()
```
    The base file or directory.
    
    Returns:
    
    the File
  - getBaseName
```
public String getBaseName()
```
    The base file or directory name of the data, as specified in the .torrent file, but filtered to remove illegal characters. This is where the data actually is, relative to the snark base dir.
  - getBitField
```
public BitField getBitField()
```
    The BitField that tells which pieces this storage contains. Do not change this since this is the current state of the storage.
  - getCheckingProgress
```
public double getCheckingProgress()
```
    If checking is in progress, return completion 0.0 ... 1.0, else return 1.0.
  - getDirectories
```
public SortedSet<File> getDirectories()
```
    Includes the base for a multi-file torrent. Sorted bottom-up for easy deletion. Slow. Use for deletion only.
    
    Returns:
    
    a new Set or null for a single-file torrent
  - getExcludedFiles
```
public List<String> getExcludedFiles(File base)
```
  - getFileCount
```
public int getFileCount()
```
    Does not include directories.
  - getFilePriorities
```
public int[] getFilePriorities()
```
    Get the file priorities array.
    
    Returns:
    
    null on error, if complete, or if only one file
  - getFiles
```
public List<File> getFiles()
```
    Does not include directories. Unsorted.
    
    Returns:
    
    a new List
  - getInOrder
```
public boolean getInOrder()
```
    Returns:
    
    whether in-order download mode is enabled
  - getMetaInfo
```
public MetaInfo getMetaInfo()
```
    Returns the MetaInfo associated with this Storage.
  - getPiece
```
public ByteArray getPiece(int piece,
                          int off,
                          int len)
                   throws IOException
```
    Returns a byte array containing a portion of the requested piece or null if the storage doesn't contain the piece yet.
    
    Throws:
    
    IOException
  - getPiecePriorities
```
public int[] getPiecePriorities()
```
    Call setPriority() for all changed files first, then call this. Set the piece priority to the highest priority of all files spanning the piece. Caller must pass array to the PeerCoordinator.
    
    Returns:
    
    null on error, if complete, or if only one file and inOrder not set.
  - getPreserveFileNames
```
public boolean getPreserveFileNames()
```
    Returns:
    
    true if original file names are being preserved, false if filtered
  - getPriority
```
public int getPriority(int fileIndex)
```
    Parameters:
    
    fileIndex - as obtained from indexOf
  - getSkippedLength
```
public long getSkippedLength()
```
    Call setPriority() for all changed files first, then call this. The length of all the pieces that are not yet downloaded, and are set to skipped. This is not the same as the total of all skipped files, since pieces may span multiple files.
    
    Returns:
    
    0 on error, if complete, or if only one file
  - indexOf
```
public int indexOf(File file)
```
    Get index to pass to remaining(), getPriority(), setPriority()
    
    Parameters:
    
    file - non-canonical path (non-directory)
    
    Returns:
    
    internal index of file; -1 if unknown file
  - isAllocating
```
public boolean isAllocating()
```
    Disk allocation (ballooning) in progress. Always false on Windows.
  - isChanged
```
public boolean isChanged()
```
    Has the storage changed since instantiation?
  - isChecking
```
public boolean isChecking()
```
    File checking in progress.
  - main
```
public static void main(String[] args)
```
    Create a metainfo. Used in the installer build process; do not comment out.
  - needed
```
public int needed()
```
    How many pieces are still missing from this storage.
  - putPiece
```
public boolean putPiece(PartialPiece pp)
                 throws IOException
```
    Put the piece in the Storage if it is correct. Warning - takes a LONG time if complete as it does the recheck here. TODO thread the recheck?
    
    Returns:
    
    true if the piece was correct (sha metainfo hash matches), otherwise false.
    
    Throws:
    
    IOException - when some storage related error occurs.
  - recheck
```
public boolean recheck()
                throws IOException
```
    Blocking. Holds lock. Recommend running only when stopped. Caller should thread. Calls listener.setWantedPieces() on completion if anything changed.
    
    Returns:
    
    true if anything changed, false otherwise
    
    Throws:
    
    IOException
  - remaining
```
public long[] remaining()
```
    For efficiency, calculate remaining bytes for all files at once
    
    Returns:
    
    number of bytes remaining for each file, use indexOf() to get index for a file
  - remaining2
```
public long[][] remaining2()
```
    For efficiency, calculate remaining bytes for all files at once. Remaining bytes is rv[0]. Preview bytes is rv[1].
    
    Returns:
    
    number of bytes remaining and number of bytes available for a preview for each file, use indexOf() to get index for a file
  - reopen
```
public void reopen()
            throws IOException
```
    Doesn't really reopen the file descriptors for a restart. Just does an existence check but no length check or data reverification
    
    Throws:
    
    IOException - on fail
  - setActivity
```
public void setActivity(long time)
```
    Set the activity timestamp.
    
    Parameters:
    
    time - timestamp in milliseconds since epoch
  - setFilePriorities
```
void setFilePriorities(int[] p)
```
    Set the file priorities array. Only call this when stopped, but after check()
    
    Parameters:
    
    p - may be null
  - setInOrder
```
public void setInOrder(boolean yes)
```
    Enable or disable in-order download mode. When enabled, pieces within each file are prioritized sequentially. Must call setFilePriorities() BEFORE this method.
    
    Parameters:
    
    yes - true to enable in-order mode, false to disable
  - setPriority
```
public void setPriority(int fileIndex,
                        int pri)
```
    Must call Snark.updatePiecePriorities() (which calls getPiecePriorities()) after calling this.
    
    Parameters:
    
    fileIndex - as obtained from indexOf
    
    pri - default 0; <0 to disable

Class Storage

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_PREALLOCATE_FILES

MAX_PIECE_SIZE

MAX_PIECES

MAX_TOTAL_SIZE

PRIORITY_NORMAL

PRIORITY_SKIP

PROP_PREALLOCATE_FILES

Constructor Detail

Storage

Storage

Storage

Method Detail

check

check

cleanRAFs

clearChanged

close

complete

filterName

getActivity

getBase

getBaseName

getBitField

getCheckingProgress

getDirectories

getExcludedFiles

getFileCount

getFilePriorities

getFiles

getInOrder

getMetaInfo

getPiece

getPiecePriorities

getPreserveFileNames

getPriority

getSkippedLength

indexOf

isAllocating

isChanged

isChecking

main

needed

putPiece

recheck

remaining

remaining2

reopen

setActivity

setFilePriorities

setInOrder

setPriority