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Create MmapFileTest.java
This commit is contained in:
Chris Lu
parent
24c8e6bcb4
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60158a23b3
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package seaewedfs.mmap;
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import org.junit.Test;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.MappedByteBuffer;
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import java.nio.channels.FileChannel;
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public class MmapFileTest {
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File dir = new File("/Users/chris/tmp/mm/dev");
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@Test
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public void testMmap() {
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try {
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System.out.println("starting ...");
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File f = new File(dir, "mmap_file.txt");
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RandomAccessFile raf = new RandomAccessFile(f, "rw");
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FileChannel fc = raf.getChannel();
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MappedByteBuffer mbf = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
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fc.close();
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raf.close();
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FileOutputStream fos = new FileOutputStream(f);
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fos.write("abcdefg".getBytes());
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fos.close();
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System.out.println("completed!");
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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@Test
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public void testBigMmap() throws IOException {
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/*
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// new file
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I0817 09:48:02 25175 dir.go:147] create /dev/mmap_big.txt: OpenReadWrite+OpenCreate
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I0817 09:48:02 25175 wfs.go:116] AcquireHandle /dev/mmap_big.txt uid=502 gid=20
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I0817 09:48:02 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 0
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I0817 09:48:02 25175 meta_cache_subscribe.go:32] creating /dev/mmap_big.txt
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//get channel
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I0817 09:48:26 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 0
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I0817 09:48:32 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 0
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I0817 09:48:32 25175 wfs.go:116] AcquireHandle /dev/mmap_big.txt uid=0 gid=0
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I0817 09:48:32 25175 filehandle.go:160] Release /dev/mmap_big.txt fh 14968871991130164560
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//fileChannel.map
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I0817 09:49:18 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 0
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I0817 09:49:18 25175 file.go:112] /dev/mmap_big.txt file setattr set size=262144 chunks=0
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I0817 09:49:18 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 262144
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I0817 09:49:18 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 262144
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I0817 09:49:18 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 262144
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// buffer.put
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I0817 09:49:49 25175 filehandle.go:57] /dev/mmap_big.txt read fh 14968871991130164560: [0,32768) size 32768 resp.Data len=0 cap=32768
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I0817 09:49:49 25175 reader_at.go:113] zero2 [0,32768)
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I0817 09:49:50 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 262144
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I0817 09:49:53 25175 file.go:233] /dev/mmap_big.txt fsync file Fsync [ID=0x4 Node=0xe Uid=0 Gid=0 Pid=0] Handle 0x2 Flags 1
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//close
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I0817 09:50:14 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 262144
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I0817 09:50:14 25175 dirty_page.go:130] saveToStorage /dev/mmap_big.txt 1,315b69812039e5 [0,4096) of 262144 bytes
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I0817 09:50:14 25175 file.go:274] /dev/mmap_big.txt existing 0 chunks adds 1 more
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I0817 09:50:14 25175 filehandle.go:218] /dev/mmap_big.txt set chunks: 1
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I0817 09:50:14 25175 filehandle.go:220] /dev/mmap_big.txt chunks 0: 1,315b69812039e5 [0,4096)
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I0817 09:50:14 25175 meta_cache_subscribe.go:23] deleting /dev/mmap_big.txt
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I0817 09:50:14 25175 meta_cache_subscribe.go:32] creating /dev/mmap_big.txt
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// end of test
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I0817 09:50:41 25175 file.go:62] file Attr /dev/mmap_big.txt, open:1, size: 262144
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I0817 09:50:41 25175 filehandle.go:160] Release /dev/mmap_big.txt fh 14968871991130164560
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*/
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// Create file object
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File file = new File(dir, "mmap_big.txt");
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try (RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw")) {
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// Get file channel in read-write mode
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FileChannel fileChannel = randomAccessFile.getChannel();
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// Get direct byte buffer access using channel.map() operation
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MappedByteBuffer buffer = fileChannel.map(FileChannel.MapMode.READ_WRITE, 0, 4096 * 8 * 8);
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//Write the content using put methods
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buffer.put("howtodoinjava.com".getBytes());
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}
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/*
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> meta.cat /dev/mmap_big.txt
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{
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"name": "mmap_big.txt",
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"isDirectory": false,
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"chunks": [
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{
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"fileId": "1,315b69812039e5",
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"offset": "0",
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"size": "4096",
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"mtime": "1597683014026365000",
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"eTag": "985ab0ac",
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"sourceFileId": "",
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"fid": {
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"volumeId": 1,
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"fileKey": "3234665",
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"cookie": 2166372837
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},
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"sourceFid": null,
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"cipherKey": null,
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"isCompressed": true,
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"isChunkManifest": false
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}
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],
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"attributes": {
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"fileSize": "262144",
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"mtime": "1597683014",
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"fileMode": 420,
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"uid": 502,
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"gid": 20,
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"crtime": "1597682882",
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"mime": "application/octet-stream",
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"replication": "",
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"collection": "",
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"ttlSec": 0,
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"userName": "",
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"groupName": [
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],
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"symlinkTarget": "",
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"md5": null
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},
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"extended": {
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}
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}
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*/
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}
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}
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