Examples with PageCursor org.neo4j.io.pagecache.PageCursor used on opensource projects

Example 81 with PageCursor

use of org.neo4j.io.pagecache.PageCursor in project neo4j by neo4j.

the class CrashGenerationCleanerTest method initializeFile.

private void initializeFile(PagedFile pagedFile, Page... pages) throws IOException {
    try (PageCursor cursor = pagedFile.io(0, PagedFile.PF_SHARED_WRITE_LOCK)) {
        for (Page page : pages) {
            cursor.next();
            page.write(cursor, corruptableTreeNode, stableGeneration, unstableGeneration, crashGeneration);
        }
    }
}

Example 82 with PageCursor

use of org.neo4j.io.pagecache.PageCursor in project neo4j by neo4j.

the class GBPTreeTest method setFormatVersion.

private void setFormatVersion(int pageSize, int formatVersion) throws IOException {
    try (PagedFile pagedFile = pageCache.map(indexFile, pageSize);
        PageCursor cursor = pagedFile.io(IdSpace.META_PAGE_ID, PagedFile.PF_SHARED_WRITE_LOCK)) {
        assertTrue(cursor.next());
        cursor.putInt(formatVersion);
    }
}

Example 83 with PageCursor

use of org.neo4j.io.pagecache.PageCursor in project neo4j by neo4j.

the class PageAwareByteArrayCursor method openLinkedCursor.

@Override
public PageCursor openLinkedCursor(long pageId) {
    PageCursor toReturn = new PageAwareByteArrayCursor(pages, pageSize, pageId);
    if (linkedCursor != null) {
        linkedCursor.close();
    }
    linkedCursor = toReturn;
    return toReturn;
}

Example 84 with PageCursor

use of org.neo4j.io.pagecache.PageCursor in project neo4j by neo4j.

the class PageCursorUtilTest method shouldFailOnInvalidValues.

@Test
public void shouldFailOnInvalidValues() throws Exception {
    // GIVEN
    PageCursor cursor = ByteArrayPageCursor.wrap(10);
    // WHEN
    for (int i = 0; i < 1_000; ) {
        long expected = random.nextLong();
        if ((expected & ~_6B_MASK) != 0) {
            // OK here we have an invalid value
            cursor.setOffset(0);
            try {
                PageCursorUtil.put6BLong(cursor, expected);
                fail("Should have failed");
            } catch (IllegalArgumentException e) {
            // THEN good
            }
            i++;
        }
    }
}

Example 85 with PageCursor

use of org.neo4j.io.pagecache.PageCursor in project neo4j by neo4j.

the class FreeListIdProvider method releaseId.

@Override
public void releaseId(long stableGeneration, long unstableGeneration, long id) throws IOException {
    try (PageCursor cursor = pagedFile.io(writePageId, PagedFile.PF_SHARED_WRITE_LOCK)) {
        PageCursorUtil.goTo(cursor, "free-list write page", writePageId);
        freelistNode.write(cursor, unstableGeneration, id, writePos);
        writePos++;
    }
    if (writePos >= freelistNode.maxEntries()) {
        // Current free-list write page is full, allocate a new one.
        long nextFreelistPage = acquireNewId(stableGeneration, unstableGeneration, false);
        try (PageCursor cursor = pagedFile.io(writePageId, PagedFile.PF_SHARED_WRITE_LOCK)) {
            PageCursorUtil.goTo(cursor, "free-list write page", writePageId);
            FreelistNode.initialize(cursor);
            // Link previous --> new writer page
            FreelistNode.setNext(cursor, nextFreelistPage);
        }
        writePageId = nextFreelistPage;
        writePos = 0;
        monitor.acquiredFreelistPageId(nextFreelistPage);
    }
}