Examples with PageReference org.sirix.page.PageReference used on opensource projects

Example 11 with PageReference

use of org.sirix.page.PageReference in project sirix by sirixdb.

the class PageReadTrxImpl method getSnapshotPages.

/**
 * Dereference key/value page reference and get all leaves, the {@link KeyValuePage}s from the
 * revision-trees.
 *
 * @param recordPageKey key of node page
 * @param pageKind kind of page, that is the type of tree to dereference
 * @param index index number or {@code -1}, if it's a regular record page
 * @param pageReference optional page reference pointing to the first page
 * @return dereferenced pages
 *
 * @throws SirixIOException if an I/O-error occurs within the creation process
 */
final <K extends Comparable<? super K>, V extends Record, T extends KeyValuePage<K, V>> List<T> getSnapshotPages(final PageReference pageReference) {
    assert pageReference != null;
    final ResourceConfiguration config = mResourceManager.getResourceConfig();
    final int revsToRestore = config.mRevisionsToRestore;
    final int[] revisionsToRead = config.mRevisionKind.getRevisionRoots(mRootPage.getRevision(), revsToRestore);
    final List<T> pages = new ArrayList<>(revisionsToRead.length);
    boolean first = true;
    for (int i = 0; i < revisionsToRead.length; i++) {
        long refKeyToRecordPage = Constants.NULL_ID_LONG;
        if (first) {
            first = false;
            refKeyToRecordPage = pageReference.getKey();
        } else {
            refKeyToRecordPage = pages.get(pages.size() - 1).getPreviousReferenceKey();
        }
        if (refKeyToRecordPage != Constants.NULL_ID_LONG) {
            final PageReference reference = new PageReference().setKey(refKeyToRecordPage);
            if (reference.getKey() != Constants.NULL_ID_LONG) {
                @SuppressWarnings("unchecked") final T page = (T) mPageReader.read(reference, this);
                pages.add(page);
                if (page.size() == Constants.NDP_NODE_COUNT) {
                    // versions.
                    break;
                }
            }
        } else {
            break;
        }
    }
    return pages;
}

Example 12 with PageReference

use of org.sirix.page.PageReference in project sirix by sirixdb.

the class PageReadTrxImpl method getRecordPageContainer.

@Override
public <K extends Comparable<? super K>, V extends Record, T extends KeyValuePage<K, V>> PageContainer getRecordPageContainer(@Nonnegative final Long recordPageKey, final int index, final PageKind pageKind) throws SirixIOException {
    assertNotClosed();
    checkArgument(recordPageKey >= 0, "recordPageKey must not be negative!");
    final Optional<PageReference> pageReferenceToRecordPage = getLeafPageReference(checkNotNull(recordPageKey), index, checkNotNull(pageKind));
    if (!pageReferenceToRecordPage.isPresent()) {
        return PageContainer.emptyInstance();
    }
    // Try to get from resource buffer manager.
    final PageContainer recordPageContainerFromBuffer = mResourceBufferManager.getRecordPageCache().get(pageReferenceToRecordPage.get());
    if (recordPageContainerFromBuffer != null) {
        return recordPageContainerFromBuffer;
    }
    // Load list of page "fragments" from persistent storage.
    final List<T> pages = getSnapshotPages(pageReferenceToRecordPage.get());
    if (pages.isEmpty()) {
        return PageContainer.emptyInstance();
    }
    final int mileStoneRevision = mResourceConfig.mRevisionsToRestore;
    final Versioning revisioning = mResourceConfig.mRevisionKind;
    final Page completePage = revisioning.combineRecordPages(pages, mileStoneRevision, this);
    final PageContainer recordPageContainer = new PageContainer(completePage, clone(completePage));
    if (mTrxIntentLog == null)
        mResourceBufferManager.getRecordPageCache().put(pageReferenceToRecordPage.get(), recordPageContainer);
    return recordPageContainer;
}

Example 13 with PageReference

use of org.sirix.page.PageReference in project sirix by sirixdb.

the class PageWriteTrxImpl method preparePreviousRevisionRootPage.

/**
 * Prepare the previous revision root page and retrieve the next {@link RevisionRootPage}.
 *
 * @param baseRevision base revision
 * @param representRevision the revision to represent
 * @return new {@link RevisionRootPage} instance
 * @throws SirixIOException if an I/O error occurs
 */
private RevisionRootPage preparePreviousRevisionRootPage(@Nonnegative final int baseRevision, @Nonnegative final int representRevision) throws SirixIOException {
    if (getUberPage().isBootstrap()) {
        final RevisionRootPage revisionRootPage = mPageRtx.loadRevRoot(baseRevision);
        // appendLogRecord(new PageContainer(revisionRootPage, revisionRootPage));
        return revisionRootPage;
    } else {
        // Prepare revision root nodePageReference.
        final RevisionRootPage revisionRootPage = new RevisionRootPage(mPageRtx.loadRevRoot(baseRevision), representRevision + 1);
        // Prepare indirect tree to hold reference to prepared revision root nodePageReference.
        final PageReference revisionRootPageReference = prepareLeafOfTree(getUberPage().getIndirectPageReference(), getUberPage().getRevisionNumber(), -1, PageKind.UBERPAGE);
        // Link the prepared revision root nodePageReference with the prepared indirect tree.
        appendLogRecord(revisionRootPageReference, new PageContainer(revisionRootPage, revisionRootPage));
        // Return prepared revision root nodePageReference.
        return revisionRootPage;
    }
}

Example 14 with PageReference

use of org.sirix.page.PageReference in project sirix by sirixdb.

the class PageWriteTrxImpl method prepareLeafOfTree.

/**
 * Prepare the leaf of a tree, namely the reference to a {@link UnorderedKeyValuePage}.
 *
 * @param startReference start reference
 * @param key page key to lookup
 * @param index the index number or {@code -1} if a regular record page should be prepared
 * @return {@link PageReference} instance pointing to the right {@link UnorderedKeyValuePage} with
 *         the {@code pKey}
 * @throws SirixIOException if an I/O error occured
 */
private PageReference prepareLeafOfTree(final PageReference startReference, @Nonnegative final long key, final int index, final PageKind pageKind) throws SirixIOException {
    // Initial state pointing to the indirect nodePageReference of level 0.
    PageReference reference = startReference;
    int offset = 0;
    long levelKey = key;
    final int[] inpLevelPageCountExp = mPageRtx.getUberPage().getPageCountExp(pageKind);
    // Iterate through all levels.
    for (int level = 0, height = inpLevelPageCountExp.length; level < height; level++) {
        offset = (int) (levelKey >> inpLevelPageCountExp[level]);
        levelKey -= offset << inpLevelPageCountExp[level];
        final IndirectPage page = prepareIndirectPage(reference);
        reference = page.getReference(offset);
    }
    // Return reference to leaf of indirect tree.
    return reference;
}

Example 15 with PageReference

use of org.sirix.page.PageReference in project sirix by sirixdb.

the class ResourceStore method openResource.

/**
 * Open a resource, that is get an instance of a {@link ResourceManager} in order to read/write
 * from the resource.
 *
 * @param database The database.
 * @param resourceConfig The resource configuration.
 * @param resourceManagerConfig The resource manager configuration.
 * @param bufferManager The buffer manager.
 * @param resourceFile The resource to open.
 * @return A resource manager.
 */
public ResourceManager openResource(@Nonnull final DatabaseImpl database, @Nonnull final ResourceConfiguration resourceConfig, @Nonnull final ResourceManagerConfiguration resourceManagerConfig, @Nonnull final BufferManager bufferManager, @Nonnull final Path resourceFile) {
    checkNotNull(database);
    checkNotNull(resourceConfig);
    return mResourceManagers.computeIfAbsent(resourceFile, k -> {
        final Storage storage = StorageType.getStorage(resourceConfig);
        final UberPage uberPage;
        if (storage.exists()) {
            try (final Reader reader = storage.createReader()) {
                final PageReference firstRef = reader.readUberPageReference();
                if (firstRef.getPage() == null) {
                    uberPage = (UberPage) reader.read(firstRef, null);
                } else {
                    uberPage = (UberPage) firstRef.getPage();
                }
            }
        } else {
            // Bootstrap uber page and make sure there already is a root node.
            uberPage = new UberPage();
        }
        final ResourceManager resourceManager = new XdmResourceManager(database, this, resourceConfig, resourceManagerConfig, bufferManager, StorageType.getStorage(resourceConfig), uberPage, mReadSemaphore, mWriteSempahore);
        Databases.putResourceManager(resourceFile, resourceManager);
        return resourceManager;
    });
}