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Oracle® Coherence Java API Reference
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## com.tangosol.io.nio
Class MappedBufferManager

    java.lang.Object
      com.tangosol.util.Base
          com.tangosol.io.nio.AbstractBufferManager
              com.tangosol.io.nio.MappedBufferManager

All Implemented Interfaces:
  ByteBufferManager

    public class MappedBufferManager

extends AbstractBufferManager

Manages a ByteBuffer on a file.

Since:
  Coherence 2.2
Author:
  cp 2002.09.18
See Also:
  `ByteBuffer`

Field Summary
`static int` | `DEFAULT_MAX_SIZE` Default maximum size for a memory mapped file.
`static int` | `DEFAULT_MIN_SIZE` Default minimum size for a memory mapped file.

Constructor Summary
`MappedBufferManager()` Construct a MappedBufferManager using defaults.
`MappedBufferManager(int cbInitial, int cbMaximum, java.io.File file)` Construct a MappedBufferManager that supports a buffer of a certain initial and maximum size.

Method Summary
`protected void` | `allocateBuffer()` Allocate a new buffer, copying old data if there is any.
`void` | `close()` Close the underlying resources.
`protected void` | `configureFile(java.io.File file)` Configure the buffer manager based on the passed file, which may be null to imply a default temp file, a directory to imply that a file be created in that directory, or it may be the temp file itself.
`protected void` | `finalize()` Perform cleanup during garbage collection.
`protected java.io.RandomAccessFile` | `getFile()` Obtain the RandomAccessFile that the buffer is constructed on.
`protected void` | `setFile(java.io.RandomAccessFile file)` Specify the RandomAccessFile that the buffer will be constructed on.

Methods inherited from class com.tangosol.io.nio.AbstractBufferManager
`calibrate, getBuffer, getCapacity, getGrowthThreshold, getMaxCapacity, getMaxIncrement, getMinCapacity, getShrinkageThreshold, grow, setBuffer, setCapacity, setGrowthThreshold, setMaxCapacity, setMinCapacity, setShrinkageThreshold, shrink`

Field Detail

### DEFAULT_MIN_SIZE

    public static final int DEFAULT_MIN_SIZE

  Default minimum size for a memory mapped file.

  See Also:
    Constant Field Values

### DEFAULT_MAX_SIZE

    public static final int DEFAULT_MAX_SIZE

  Default maximum size for a memory mapped file.

  See Also:
    Constant Field Values

Constructor Detail

### MappedBufferManager

    public MappedBufferManager()

  Construct a MappedBufferManager using defaults.

### MappedBufferManager

    public MappedBufferManager(int cbInitial,
                               int cbMaximum,
                               java.io.File file)

  Construct a MappedBufferManager that supports a buffer of a certain initial and maximum size.

  Parameters:
    `cbInitial` - the initial size
    `cbMaximum` - the maximum size
    `file` - the file to use, or the directory to use, or null to generate a temporary file in the default location

Method Detail

### configureFile

    protected void configureFile(java.io.File file)

  Configure the buffer manager based on the passed file, which may be null to imply a default temp file, a directory to imply that a file be created in that directory, or it may be the temp file itself.

  Parameters:
    `file` - the file to use, or the directory to use, or null to generate a temporary file in the default location

### getFile

    protected java.io.RandomAccessFile getFile()

  Obtain the RandomAccessFile that the buffer is constructed on.

  Returns:
    the RandomAccessFile object

### setFile

    protected void setFile(java.io.RandomAccessFile file)

  Specify the RandomAccessFile that the buffer will be constructed on.

  Parameters:
    `file` - the RandomAccessFile object

### allocateBuffer

    protected void allocateBuffer()

  Allocate a new buffer, copying old data if there is any.

  Specified by:
    `allocateBuffer` in class `AbstractBufferManager`
  See Also:
    `FileChannel.map()`

### close

    public void close()

  Close the underlying resources.

### finalize

    protected void finalize()

  Perform cleanup during garbage collection.

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Oracle® Coherence Java API Reference
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