Examples with StoreChannel org.neo4j.io.fs.StoreChannel used on opensource projects

Example 61 with StoreChannel

use of org.neo4j.io.fs.StoreChannel in project neo4j by neo4j.

the class MuninnPageCacheTest method writeInitialDataTo.

private void writeInitialDataTo(File file) throws IOException {
    StoreChannel channel = fs.create(file);
    ByteBuffer buf = ByteBuffer.allocate(16);
    buf.putLong(x);
    buf.putLong(y);
    buf.flip();
    channel.writeAll(buf);
    channel.close();
}

Example 62 with StoreChannel

use of org.neo4j.io.fs.StoreChannel in project neo4j by neo4j.

the class SingleFilePageSwapperTest method swappingOutMustNotOverwriteDataBeyondPage.

@Test
public void swappingOutMustNotOverwriteDataBeyondPage() throws Exception {
    byte[] initialData = new byte[] { // --- page 0:
    1, 2, 3, 4, // --- page 1:
    5, 6, 7, 8, // --- page 2:
    9, 10 };
    byte[] finalData = new byte[] { // --- page 0:
    1, 2, 3, 4, // --- page 1:
    8, 7, 6, 5, // --- page 2:
    9, 10 };
    StoreChannel channel = getFs().create(getFile());
    channel.writeAll(wrap(initialData));
    channel.close();
    byte[] change = new byte[] { 8, 7, 6, 5 };
    ByteBufferPage page = new ByteBufferPage(wrap(change));
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapper(factory, getFile(), 4, null, false);
    swapper.write(1, page);
    InputStream stream = getFs().openAsInputStream(getFile());
    byte[] actual = new byte[(int) getFs().getFileSize(getFile())];
    assertThat(stream.read(actual), is(actual.length));
    assertThat(actual, byteArray(finalData));
}

Example 63 with StoreChannel

use of org.neo4j.io.fs.StoreChannel in project neo4j by neo4j.

the class SingleFilePageSwapperTest method mustZeroFillPageBeyondEndOfFile.

@Test
public void mustZeroFillPageBeyondEndOfFile() throws Exception {
    byte[] bytes = new byte[] { // --- page 0:
    1, 2, 3, 4, // --- page 1:
    5, 6 };
    StoreChannel channel = getFs().create(getFile());
    channel.writeAll(wrap(bytes));
    channel.close();
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapper(factory, getFile(), 4, null, false);
    ByteBuffer target = ByteBuffer.allocateDirect(4);
    ByteBufferPage page = new ByteBufferPage(target);
    swapper.read(1, page);
    assertThat(array(target), byteArray(new byte[] { 5, 6, 0, 0 }));
}

Example 64 with StoreChannel

use of org.neo4j.io.fs.StoreChannel in project neo4j by neo4j.

the class SingleFilePageSwapperTest method swappingInMustFillPageWithData.

@Test
public void swappingInMustFillPageWithData() throws Exception {
    byte[] bytes = new byte[] { 1, 2, 3, 4 };
    StoreChannel channel = getFs().create(getFile());
    channel.writeAll(wrap(bytes));
    channel.close();
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapper(factory, getFile(), 4, null, false);
    ByteBuffer target = ByteBuffer.allocateDirect(4);
    ByteBufferPage page = new ByteBufferPage(target);
    swapper.read(0, page);
    assertThat(array(target), byteArray(bytes));
}

Example 65 with StoreChannel

use of org.neo4j.io.fs.StoreChannel in project neo4j by neo4j.

the class SingleFilePageSwapperTest method mustCloseFilesIfTakingFileLockThrows.

@Test
public void mustCloseFilesIfTakingFileLockThrows() throws Exception {
    // no file locking on Windows.
    assumeFalse("No file locking on Windows", SystemUtils.IS_OS_WINDOWS);
    final AtomicInteger openFilesCounter = new AtomicInteger();
    PageSwapperFactory factory = createSwapperFactory();
    factory.setFileSystemAbstraction(new DelegatingFileSystemAbstraction(fileSystem) {

        @Override
        public StoreChannel open(File fileName, String mode) throws IOException {
            openFilesCounter.getAndIncrement();
            return new DelegatingStoreChannel(super.open(fileName, mode)) {

                @Override
                public void close() throws IOException {
                    openFilesCounter.getAndDecrement();
                    super.close();
                }
            };
        }
    });
    File file = testDir.file("file");
    try (StoreChannel ch = fileSystem.create(file);
        FileLock ignore = ch.tryLock()) {
        createSwapper(factory, file, 4, NO_CALLBACK, false).close();
        fail("Creating a page swapper for a locked channel should have thrown");
    } catch (FileLockException e) {
    // As expected.
    }
    assertThat(openFilesCounter.get(), is(0));
}