JavaUtils (common utils 0.3.6 API)

java.lang.Object
- tech.mlsql.common.utils.distribute.socket.server.JavaUtils

```
public class JavaUtils
extends Object
```

Field Summary

Fields
Modifier and Type	Field and Description
`static long`	`DEFAULT_DRIVER_MEM_MB` Define a default value for driver memory here since this value is referenced across the code base and nearly all files already use Utils.scala

Constructor Summary

Constructors
Constructor and Description

JavaUtils()

Constructors
Constructor and Description
`JavaUtils()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static byte[]`	`bufferToArray(ByteBuffer buffer)` Returns a byte array with the buffer's contents, trying to avoid copying the data if possible.
`static String`	`bytesToString(ByteBuffer b)` Convert the given byte buffer to a string.
`static long`	`byteStringAs(String str, ByteUnit unit)` Convert a passed byte string (e.g.
`static long`	`byteStringAsBytes(String str)` Convert a passed byte string (e.g.
`static long`	`byteStringAsGb(String str)` Convert a passed byte string (e.g.
`static long`	`byteStringAsKb(String str)` Convert a passed byte string (e.g.
`static long`	`byteStringAsMb(String str)` Convert a passed byte string (e.g.
`static void`	`closeQuietly(Closeable closeable)` Closes the given object, ignoring IOExceptions.
`static void`	`deleteRecursively(File file)` Delete a file or directory and its contents recursively.
`static void`	`deleteRecursively(File file, FilenameFilter filter)` Delete a file or directory and its contents recursively.
`static int`	`nonNegativeHash(Object obj)` Returns a hash consistent with Spark's Utils.nonNegativeHash().
`static void`	`readFully(ReadableByteChannel channel, ByteBuffer dst)` Fills a buffer with data read from the channel.
`static ByteBuffer`	`stringToBytes(String s)` Convert the given string to a byte buffer.
`static long`	`timeStringAs(String str, TimeUnit unit)` Convert a passed time string (e.g.
`static long`	`timeStringAsMs(String str)` Convert a time parameter such as (50s, 100ms, or 250us) to milliseconds for internal use.
`static long`	`timeStringAsSec(String str)` Convert a time parameter such as (50s, 100ms, or 250us) to seconds for internal use.

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

- Field Detail
  - DEFAULT_DRIVER_MEM_MB
```
public static final long DEFAULT_DRIVER_MEM_MB
```
    Define a default value for driver memory here since this value is referenced across the code base and nearly all files already use Utils.scala
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - JavaUtils
```
public JavaUtils()
```
- Method Detail
  - closeQuietly
```
public static void closeQuietly(Closeable closeable)
```
    Closes the given object, ignoring IOExceptions.
  - nonNegativeHash
```
public static int nonNegativeHash(Object obj)
```
    Returns a hash consistent with Spark's Utils.nonNegativeHash().
  - stringToBytes
```
public static ByteBuffer stringToBytes(String s)
```
    Convert the given string to a byte buffer. The resulting buffer can be converted back to the same string through bytesToString(ByteBuffer).
  - bytesToString
```
public static String bytesToString(ByteBuffer b)
```
    Convert the given byte buffer to a string. The resulting string can be converted back to the same byte buffer through stringToBytes(String).
  - deleteRecursively
```
public static void deleteRecursively(File file)
                              throws IOException
```
    Delete a file or directory and its contents recursively. Don't follow directories if they are symlinks.
    
    Parameters:
    
    file - Input file / dir to be deleted
    
    Throws:
    
    IOException - if deletion is unsuccessful
  - deleteRecursively
```
public static void deleteRecursively(File file,
                                     FilenameFilter filter)
                              throws IOException
```
    Delete a file or directory and its contents recursively. Don't follow directories if they are symlinks.
    
    Parameters:
    
    file - Input file / dir to be deleted
    
    filter - A filename filter that make sure only files / dirs with the satisfied filenames are deleted.
    
    Throws:
    
    IOException - if deletion is unsuccessful
  - timeStringAs
```
public static long timeStringAs(String str,
                                TimeUnit unit)
```
    Convert a passed time string (e.g. 50s, 100ms, or 250us) to a time count in the given unit. The unit is also considered the default if the given string does not specify a unit.
  - timeStringAsMs
```
public static long timeStringAsMs(String str)
```
    Convert a time parameter such as (50s, 100ms, or 250us) to milliseconds for internal use. If no suffix is provided, the passed number is assumed to be in ms.
  - timeStringAsSec
```
public static long timeStringAsSec(String str)
```
    Convert a time parameter such as (50s, 100ms, or 250us) to seconds for internal use. If no suffix is provided, the passed number is assumed to be in seconds.
  - byteStringAs
```
public static long byteStringAs(String str,
                                ByteUnit unit)
```
    Convert a passed byte string (e.g. 50b, 100kb, or 250mb) to the given. If no suffix is provided, a direct conversion to the provided unit is attempted.
  - byteStringAsBytes
```
public static long byteStringAsBytes(String str)
```
    Convert a passed byte string (e.g. 50b, 100k, or 250m) to bytes for internal use. If no suffix is provided, the passed number is assumed to be in bytes.
  - byteStringAsKb
```
public static long byteStringAsKb(String str)
```
    Convert a passed byte string (e.g. 50b, 100k, or 250m) to kibibytes for internal use. If no suffix is provided, the passed number is assumed to be in kibibytes.
  - byteStringAsMb
```
public static long byteStringAsMb(String str)
```
    Convert a passed byte string (e.g. 50b, 100k, or 250m) to mebibytes for internal use. If no suffix is provided, the passed number is assumed to be in mebibytes.
  - byteStringAsGb
```
public static long byteStringAsGb(String str)
```
    Convert a passed byte string (e.g. 50b, 100k, or 250m) to gibibytes for internal use. If no suffix is provided, the passed number is assumed to be in gibibytes.
  - bufferToArray
```
public static byte[] bufferToArray(ByteBuffer buffer)
```
    Returns a byte array with the buffer's contents, trying to avoid copying the data if possible.
  - readFully
```
public static void readFully(ReadableByteChannel channel,
                             ByteBuffer dst)
                      throws IOException
```
    Fills a buffer with data read from the channel.
    
    Throws:
    
    IOException

Class JavaUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_DRIVER_MEM_MB

Constructor Detail

JavaUtils

Method Detail

closeQuietly

nonNegativeHash

stringToBytes

bytesToString

deleteRecursively

deleteRecursively

timeStringAs

timeStringAsMs

timeStringAsSec

byteStringAs

byteStringAsBytes

byteStringAsKb

byteStringAsMb

byteStringAsGb

bufferToArray

readFully