DirectByteBufferPool

java.lang.Object
- akka.io.DirectByteBufferPool

All Implemented Interfaces:

BufferPool
```
public class DirectByteBufferPool
extends java.lang.Object
implements BufferPool
```
INTERNAL API
A buffer pool which keeps a free list of direct buffers of a specified default size in a simple fixed size stack.
If the stack is full the buffer is de-referenced and available to be freed by normal garbage collection.
Using a direct ByteBuffer when dealing with NIO operations has been proven to be faster than wrapping on-heap Arrays. There is ultimately no performance benefit to wrapping in-heap JVM data when writing with NIO.

Constructor Summary

Constructors
Constructor Description

DirectByteBufferPool(int defaultBufferSize, int maxPoolEntries)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.nio.ByteBuffer`	`acquire()`
`void`	`release(java.nio.ByteBuffer buf)`
`static void`	`tryCleanDirectByteBuffer(java.nio.ByteBuffer byteBuffer)`	DirectByteBuffers are garbage collected by using a phantom reference and a reference queue.

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

- Constructor Detail
  - DirectByteBufferPool
```
public DirectByteBufferPool(int defaultBufferSize,
                            int maxPoolEntries)
```
- Method Detail
  - tryCleanDirectByteBuffer
```
public static void tryCleanDirectByteBuffer(java.nio.ByteBuffer byteBuffer)
```
    DirectByteBuffers are garbage collected by using a phantom reference and a reference queue. Every once a while, the JVM checks the reference queue and cleans the DirectByteBuffers. However, as this doesn't happen immediately after discarding all references to a DirectByteBuffer, it's easy to OutOfMemoryError yourself using DirectByteBuffers. This function explicitly calls the Cleaner method of a DirectByteBuffer.
    Utilizes reflection to avoid dependency to sun.misc.Cleaner.
    
    Parameters:
    
    byteBuffer - (undocumented)
  - acquire
```
public java.nio.ByteBuffer acquire()
```
    Specified by:
    
    acquire in interface BufferPool
  - release
```
public void release(java.nio.ByteBuffer buf)
```
    Specified by:
    
    release in interface BufferPool