ByteBuffer (Apache SystemDS 3.1.0 API)

java.lang.Object
- org.apache.sysds.runtime.controlprogram.caching.ByteBuffer

```
public class ByteBuffer
extends Object
```
Wrapper for WriteBuffer byte array per matrix/frame in order to support matrix/frame serialization outside global lock.

Constructor Summary

Constructors
Constructor Description

ByteBuffer(long size)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`checkSerialized()`
`CacheBlock<?>`	`deserializeBlock()`
`void`	`evictBuffer(String fname)`
`void`	`freeMemory()`
`long`	`getSize()`	Returns the buffer size in bytes.
`boolean`	`isShallow()`
`static boolean`	`isValidCapacity(long size, CacheBlock<?> cb)`	Determines if byte buffer can hold the given size given this specific cache block.
`void`	`serializeBlock(CacheBlock<?> cb)`

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

Constructor Detail
- ByteBuffer
```
public ByteBuffer(long size)
```

Method Detail

serializeBlock

public void serializeBlock(CacheBlock<?> cb)
                    throws IOException

Throws:: IOException

deserializeBlock

public CacheBlock<?> deserializeBlock()
                               throws IOException

Throws:: IOException

evictBuffer

public void evictBuffer(String fname)
                 throws IOException

Throws:: IOException

getSize
```
public long getSize()
```
Returns the buffer size in bytes.

Returns:

buffer size in bytes

isShallow
```
public boolean isShallow()
```

freeMemory
```
public void freeMemory()
```

checkSerialized
```
public void checkSerialized()
```

isValidCapacity
```
public static boolean isValidCapacity(long size,
                                      CacheBlock<?> cb)
```
Determines if byte buffer can hold the given size given this specific cache block. This call is consistent with 'serializeBlock' and allows for internal optimization according to dense/sparse representation.

Parameters:

size - the size

cb - cache block

Returns:

true if valid capacity