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

Example 11 with ByteBufferPage

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

the class PageSwapperTest method mustThrowNullPointerExceptionFromReadWhenPageArrayElementsAreNull.

@Test
public void mustThrowNullPointerExceptionFromReadWhenPageArrayElementsAreNull() throws Exception {
    File file = file("file");
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapper = createSwapperAndFile(factory, file, 4);
    ByteBufferPage page = createPage(4);
    swapper.write(0, new Page[] { page, page, page, page }, 0, 4);
    try {
        swapper.read(0, new Page[] { page, page, null, page }, 0, 4);
        fail("vectored read with nulls in array should have thrown");
    } catch (NullPointerException npe) {
    // This is fine
    }
}

Example 12 with ByteBufferPage

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

the class PageSwapperTest method readMustNotReopenExplicitlyClosedChannel.

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

Example 13 with ByteBufferPage

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

the class PageSwapperTest method mustCreateNonExistingFileWithCreateFlag.

@Test
public void mustCreateNonExistingFileWithCreateFlag() throws Exception {
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper pageSwapper = createSwapperAndFile(factory, file("does not exist"));
    // After creating the file, we must also be able to read and write
    ByteBufferPage page = createPage();
    page.putLong(X, 0);
    pageSwapper.write(0, page);
    clear(page);
    pageSwapper.read(0, page);
    assertThat(page.getLong(0), is(X));
}

Example 14 with ByteBufferPage

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

the class PageSwapperTest method positionedVectoredWriteMustWorkOnSubsequenceOfGivenArray.

@Test
public void positionedVectoredWriteMustWorkOnSubsequenceOfGivenArray() 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(1, 0);
    pageB.putInt(2, 0);
    pageC.putInt(3, 0);
    pageD.putInt(4, 0);
    Page[] pages = { pageA, pageB, pageC, pageD };
    long bytesWritten = swapper.write(0, pages, 0, 4);
    assertThat(bytesWritten, is(16L));
    pageB.putInt(6, 0);
    pageC.putInt(7, 0);
    bytesWritten = swapper.write(1, pages, 1, 2);
    assertThat(bytesWritten, is(8L));
    pageA.putInt(0, 0);
    pageB.putInt(0, 0);
    pageC.putInt(0, 0);
    pageD.putInt(0, 0);
    long bytesRead = swapper.read(0, pages, 0, 4);
    assertThat(bytesRead, is(16L));
    int[] actualValues = { pageA.getInt(0), pageB.getInt(0), pageC.getInt(0), pageD.getInt(0) };
    int[] expectedValues = { 1, 6, 7, 4 };
    assertThat(actualValues, is(expectedValues));
}

Example 15 with ByteBufferPage

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

the class PageSwapperTest method mustNotOverwriteDataInOtherFiles.

@Test
public void mustNotOverwriteDataInOtherFiles() throws Exception {
    File fileA = file("a");
    File fileB = file("b");
    PageSwapperFactory factory = createSwapperFactory();
    PageSwapper swapperA = createSwapperAndFile(factory, fileA);
    PageSwapper swapperB = createSwapperAndFile(factory, fileB);
    ByteBufferPage page = createPage();
    page.putLong(X, 0);
    swapperA.write(0, page);
    page.putLong(Y, 8);
    swapperB.write(0, page);
    clear(page);
    swapperA.read(0, page);
    assertThat(page.getLong(0), is(X));
    assertThat(page.getLong(8), is(0L));
}