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How to create a memory-mapped file |
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Ths Java tips illustrates a method of creating a Memory-Mapped file. A ByteArray may be
created while mapping a file in memory. A ByteBuffer has a capacity that determines how
many bytes it contains. This capacity can never change. Further the bytes in ByteArray may
be retrieved by using get().
try {
File file = new File("filename");
// Create a read-only memory-mapped file
FileChannel roChannel =
new RandomAccessFile(file, "r").getChannel();
ByteBuffer readonlybuffer =
roChannel.map(FileChannel.MapMode.READ_ONLY,
0, (int)roChannel.size());
// Create a read-write memory-mapped file
FileChannel rwChannel =
new RandomAccessFile(file, "rw").getChannel();
ByteBuffer writeonlybuffer=
rwChannel.map(FileChannel.MapMode.READ_WRITE,
0, (int)rwChannel.size());
// Create a private (copy-on-write) memory-mapped file.
// Any write to this channel results in a private
// copy of the data.
FileChannel pvChannel =
new RandomAccessFile(file, "rw").getChannel();
ByteBuffer privatebuffer =
roChannel.map(FileChannel.MapMode.READ_WRITE,
0, (int)rwChannel.size());
} catch (IOException e) {
}
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