RrdSafeFileBackend (I2P Anonymous Network - Java Documentation - Version 0.9.34)

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

```
public class RrdSafeFileBackend
extends RrdFileBackend
```
JRobin backend which is used to store RRD data to ordinary files on the disk. This backend is SAFE: it locks the underlying RRD file during update/fetch operations, and caches only static parts of a RRD file in memory. Therefore, this backend is safe to be used when RRD files should be shared between several JVMs at the same time. However, this backend is a little bit slow since it does not use fast java.nio.* package (it's still based on the RandomAccessFile class).

Nested Class Summary

Nested Classes
Modifier and Type Class Description

(package private) static class RrdSafeFileBackend.Counters

Field Summary
- Fields inherited from class org.jrobin.core.RrdFileBackend
  file

Constructor Summary

Constructors
Constructor	Description
`RrdSafeFileBackend(String path, long lockWaitTime, long lockRetryPeriod)`	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.
`static String`	`getLockInfo()`
`protected boolean`	`isCachingAllowed()`	Defines the caching policy for this backend.

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, isInstanceCreated, isReadOnly, readAll, readDouble, readDouble, readInt, readLong, readString, writeDouble, writeDouble, writeDouble, writeInt, writeLong, writeString

Methods inherited from class org.jrobin.core.RrdFileBackend
getCanonicalPath, getCanonicalPath, getLength, read, setLength, write

- Constructor Detail
  - RrdSafeFileBackend
```
public RrdSafeFileBackend(String path,
                          long lockWaitTime,
                          long lockRetryPeriod)
                   throws IOException
```
    Creates RrdFileBackend object for the given file path, backed by RandomAccessFile object.
    
    Parameters:
    
    path - Path to a file
    
    lockWaitTime - lock waiting time in milliseconds
    
    lockRetryPeriod - lock retry period in milliseconds
    
    Throws:
    
    IOException - Thrown in case of I/O error
- Method Detail
  - close
```
public void close()
           throws IOException
```
    Description copied from class: RrdFileBackend
    
    Closes the underlying RRD file.
    
    Overrides:
    
    close in class RrdFileBackend
    
    Throws:
    
    IOException - Thrown in case of I/O error
  - isCachingAllowed
```
protected boolean isCachingAllowed()
```
    Defines the caching policy for this backend.
    
    Overrides:
    
    isCachingAllowed in class RrdBackend
    
    Returns:
    
    false
  - getLockInfo
```
public static String getLockInfo()
```

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