RrdFileBackend (I2P Anonymous Network - Java Documentation

java.lang.Object
- org.jrobin.core.RrdBackend
- - org.jrobin.core.RrdFileBackend

Direct Known Subclasses:

RrdNioBackend, RrdNioByteBufferBackend, RrdSafeFileBackend
```
public class RrdFileBackend
extends RrdBackend
```
JRobin backend which is used to store RRD data to ordinary files on the disk. This was the default factory before 1.4.0 version.
This backend is based on the RandomAccessFile class (java.io.* package).

Field Summary

Fields
Modifier and Type Field Description

protected RandomAccessFile file
radnom access file handle

Fields
Modifier and Type	Field	Description
`protected RandomAccessFile`	`file`	radnom access file handle

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`RrdFileBackend(String path, boolean readOnly)`	Creates RrdFileBackend object for the given file path, backed by RandomAccessFile object.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Closes the underlying RRD file.
`String`	`getCanonicalPath()`	Returns canonical path to the file on the disk.
`static String`	`getCanonicalPath(String path)`	Returns canonical path to the file on the disk.
`long`	`getLength()`	Returns RRD file length.
`protected void`	`read(long offset, byte[] b)`	Reads a number of bytes from the RRD file on the disk
`protected void`	`setLength(long length)`	Sets length of the underlying RRD file.
`protected void`	`write(long offset, byte[] b)`	Writes bytes to the underlying RRD file on the disk

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

Methods inherited from class org.jrobin.core.RrdBackend
getPath, isCachingAllowed, isInstanceCreated, isReadOnly, readAll, readDouble, readDouble, readInt, readLong, readString, writeDouble, writeDouble, writeDouble, writeInt, writeLong, writeString

- Field Detail
  - file
```
protected RandomAccessFile file
```
    radnom access file handle
- Constructor Detail
  - RrdFileBackend
```
protected RrdFileBackend(String path,
                         boolean readOnly)
                  throws IOException
```
    Creates RrdFileBackend object for the given file path, backed by RandomAccessFile object.
    
    Parameters:
    
    path - Path to a file
    
    readOnly - True, if file should be open in a read-only mode. False otherwise
    
    Throws:
    
    IOException - Thrown in case of I/O error
- Method Detail
  - close
```
public void close()
           throws IOException
```
    Closes the underlying RRD file.
    
    Overrides:
    
    close in class RrdBackend
    
    Throws:
    
    IOException - Thrown in case of I/O error
  - getCanonicalPath
```
public static String getCanonicalPath(String path)
                               throws IOException
```
    Returns canonical path to the file on the disk.
    
    Parameters:
    
    path - File path
    
    Returns:
    
    Canonical file path
    
    Throws:
    
    IOException - Thrown in case of I/O error
  - getCanonicalPath
```
public String getCanonicalPath()
                        throws IOException
```
    Returns canonical path to the file on the disk.
    
    Returns:
    
    Canonical file path
    
    Throws:
    
    IOException - Thrown in case of I/O error
  - write
```
protected void write(long offset,
                     byte[] b)
              throws IOException
```
    Writes bytes to the underlying RRD file on the disk
    
    Specified by:
    
    write in class RrdBackend
    
    Parameters:
    
    offset - Starting file offset
    
    b - Bytes to be written.
    
    Throws:
    
    IOException - Thrown in case of I/O error
  - read
```
protected void read(long offset,
                    byte[] b)
             throws IOException
```
    Reads a number of bytes from the RRD file on the disk
    
    Specified by:
    
    read in class RrdBackend
    
    Parameters:
    
    offset - Starting file offset
    
    b - Buffer which receives bytes read from the file.
    
    Throws:
    
    IOException - Thrown in case of I/O error.
  - getLength
```
public long getLength()
               throws IOException
```
    Returns RRD file length.
    
    Specified by:
    
    getLength in class RrdBackend
    
    Returns:
    
    File length.
    
    Throws:
    
    IOException - Thrown in case of I/O error.
  - setLength
```
protected void setLength(long length)
                  throws IOException
```
    Sets length of the underlying RRD file. This method is called only once, immediately after a new RRD file gets created.
    
    Specified by:
    
    setLength in class RrdBackend
    
    Parameters:
    
    length - Length of the RRD file
    
    Throws:
    
    IOException - Thrown in case of I/O error.

Class RrdFileBackend

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from class org.jrobin.core.RrdBackend

Field Detail

file

Constructor Detail

RrdFileBackend

Method Detail

close

getCanonicalPath

getCanonicalPath

write

read

getLength

setLength