Examples with ByteBufferPage org.neo4j.io.pagecache.impl.ByteBufferPage used on opensource projects

Example 21 with ByteBufferPage

use of org.neo4j.io.pagecache.impl.ByteBufferPage in project neo4j by neo4j.

the class PageSwapperTest method writeMustNotReopenExplicitlyClosedChannel.

@Test
public void writeMustNotReopenExplicitlyClosedChannel() throws Exception {
    File file = file("a");
    ByteBufferPage page = createPage();
    PageSwapperFactory swapperFactory = createSwapperFactory();
    PageSwapper swapper = createSwapperAndFile(swapperFactory, file);
    swapper.close();
    try {
        swapper.write(0, page);
        fail("Should have thrown because the channel should be closed");
    } catch (ClosedChannelException ignore) {
    // This is fine.
    }
}

Example 22 with ByteBufferPage

use of org.neo4j.io.pagecache.impl.ByteBufferPage in project neo4j by neo4j.

the class PageSwapperTest method positionedVectoredWriteMustFlushAllBuffersInOrder.

@Test
public void positionedVectoredWriteMustFlushAllBuffersInOrder() throws Exception {
    File file = file("file");
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapperAndFile(factory, file, 4);
    ByteBufferPage pageA = createPage(4);
    ByteBufferPage pageB = createPage(4);
    ByteBufferPage pageC = createPage(4);
    ByteBufferPage pageD = createPage(4);
    pageA.putInt(2, 0);
    pageB.putInt(3, 0);
    pageC.putInt(4, 0);
    pageD.putInt(5, 0);
    swapper.write(1, new Page[] { pageA, pageB, pageC, pageD }, 0, 4);
    ByteBufferPage result = createPage(4);
    swapper.read(0, result);
    assertThat(result.getInt(0), is(0));
    result.putInt(0, 0);
    assertThat(swapper.read(1, result), is(4L));
    assertThat(result.getInt(0), is(2));
    result.putInt(0, 0);
    assertThat(swapper.read(2, result), is(4L));
    assertThat(result.getInt(0), is(3));
    result.putInt(0, 0);
    assertThat(swapper.read(3, result), is(4L));
    assertThat(result.getInt(0), is(4));
    result.putInt(0, 0);
    assertThat(swapper.read(4, result), is(4L));
    assertThat(result.getInt(0), is(5));
    result.putInt(0, 0);
    assertThat(swapper.read(5, result), is(0L));
    assertThat(result.getInt(0), is(0));
}

Example 23 with ByteBufferPage

use of org.neo4j.io.pagecache.impl.ByteBufferPage in project neo4j by neo4j.

the class PageSwapperTest method mustReopenChannelWhenWriteFailsWithAsynchronousCloseException.

@Test
public void mustReopenChannelWhenWriteFailsWithAsynchronousCloseException() throws Exception {
    ByteBufferPage page = createPage();
    page.putLong(X, 0);
    page.putLong(Y, 8);
    page.putInt(Z, 16);
    File file = file("a");
    PageSwapperFactory swapperFactory = createSwapperFactory();
    PageSwapper swapper = createSwapperAndFile(swapperFactory, file);
    Thread.currentThread().interrupt();
    swapper.write(0, page);
    // Clear the interrupted flag and assert that it was still raised
    assertTrue(Thread.interrupted());
    // This must not throw because we should still have a usable channel
    swapper.force();
    clear(page);
    swapper.read(0, page);
    assertThat(page.getLong(0), is(X));
    assertThat(page.getLong(8), is(Y));
    assertThat(page.getInt(16), is(Z));
}

Example 24 with ByteBufferPage

use of org.neo4j.io.pagecache.impl.ByteBufferPage in project neo4j by neo4j.

the class PageSwapperTest method positionedVectoredReadMustFillAllBuffersInOrder.

@Test
public void positionedVectoredReadMustFillAllBuffersInOrder() throws Exception {
    File file = file("file");
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapperAndFile(factory, file, 4);
    ByteBufferPage output = createPage();
    output.putInt(2, 0);
    swapper.write(1, output);
    output.putInt(3, 0);
    swapper.write(2, output);
    output.putInt(4, 0);
    swapper.write(3, output);
    output.putInt(5, 0);
    swapper.write(4, output);
    ByteBufferPage pageA = createPage(4);
    ByteBufferPage pageB = createPage(4);
    ByteBufferPage pageC = createPage(4);
    ByteBufferPage pageD = createPage(4);
    // Read 4 pages of 4 bytes each
    assertThat(swapper.read(1, new Page[] { pageA, pageB, pageC, pageD }, 0, 4), is(4 * 4L));
    assertThat(pageA.getInt(0), is(2));
    assertThat(pageB.getInt(0), is(3));
    assertThat(pageC.getInt(0), is(4));
    assertThat(pageD.getInt(0), is(5));
}

Example 25 with ByteBufferPage

use of org.neo4j.io.pagecache.impl.ByteBufferPage in project neo4j by neo4j.

the class PageSwapperTest method vectoredWriteMustReadNothingWhenLengthIsZero.

@Test
public void vectoredWriteMustReadNothingWhenLengthIsZero() throws Exception {
    File file = file("file");
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapperAndFile(factory, file, 4);
    ByteBufferPage pageA = createPage(4);
    ByteBufferPage pageB = createPage(4);
    pageA.putInt(1, 0);
    pageB.putInt(2, 0);
    Page[] pages = { pageA, pageB };
    swapper.write(0, pages, 0, 2);
    pageA.putInt(3, 0);
    pageB.putInt(4, 0);
    swapper.write(0, pages, 0, 0);
    swapper.read(0, pages, 0, 2);
    int[] expectedValues = { 1, 2 };
    int[] actualValues = { pageA.getInt(0), pageB.getInt(0) };
    assertThat(actualValues, is(expectedValues));
}