RocksUtils (Alluxio Core - Common Utilities 295 API)

java.lang.Object
- alluxio.master.metastore.rocks.RocksUtils

public final class RocksUtils
extends java.lang.Object

Convenience methods for working with RocksDB.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static interface RocksUtils.RocksIteratorParser<T>
Used to parse current RocksIterator element.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> CloseableIterator<T>`	`createCloseableIterator(org.rocksdb.RocksIterator rocksIterator, RocksUtils.RocksIteratorParser<T> parser)`	Used to wrap an `CloseableIterator` over `RocksIterator`.
`static long`	`readLong(byte[] bytes, int start)`
`static byte[]`	`toByteArray(long long1, long long2)`
`static byte[]`	`toByteArray(long n, java.lang.String str)`

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

- Method Detail
  - toByteArray
```
public static byte[] toByteArray(long long1,
                                 long long2)
```
    Parameters:
    
    long1 - a long value
    
    long2 - a long value
    
    Returns:
    
    a byte array formed by writing the two long values as bytes
  - toByteArray
```
public static byte[] toByteArray(long n,
                                 java.lang.String str)
```
    Parameters:
    
    n - a long value
    
    str - a string value
    
    Returns:
    
    a byte array formed by writing the bytes of n followed by the bytes of str
  - readLong
```
public static long readLong(byte[] bytes,
                            int start)
```
    Parameters:
    
    bytes - an array of bytes
    
    start - the place in the array to read the long from
    
    Returns:
    
    the long
  - createCloseableIterator
```
public static <T> CloseableIterator<T> createCloseableIterator(org.rocksdb.RocksIterator rocksIterator,
                                                               RocksUtils.RocksIteratorParser<T> parser)
```
    Used to wrap an CloseableIterator over RocksIterator. It seeks given iterator to first entry before returning the iterator.
    
    Type Parameters:
    
    T - iterator value type
    
    Parameters:
    
    rocksIterator - the rocks iterator
    
    parser - parser to produce iterated values from rocks key-value
    
    Returns:
    
    wrapped iterator