Examples with FilePageStore org.apache.ignite.internal.processors.cache.persistence.file.FilePageStore used on opensource projects

Example 16 with FilePageStore

use of org.apache.ignite.internal.processors.cache.persistence.file.FilePageStore in project ignite by apache.

the class IndexPagesMetricsPageDisplacementTest method getIdxPagesOnDisk.

/**
 * Returns IDs of index pages currently residing in the storage.
 */
private List<Long> getIdxPagesOnDisk(int grpId) throws IgniteCheckedException {
    FilePageStoreManager pageStoreMgr = (FilePageStoreManager) grid.context().cache().context().pageStore();
    FilePageStore pageStore = (FilePageStore) pageStoreMgr.getStore(grpId, PageIdAllocator.INDEX_PARTITION);
    List<Long> result = new ArrayList<>();
    ByteBuffer buf = ByteBuffer.allocateDirect(pageStore.getPageSize()).order(ByteOrder.nativeOrder());
    // Page Store contains a one-page header
    long numPages = pageStore.size() / pageStore.getPageSize() - 1;
    for (int i = 0; i < numPages; i++) {
        long pageId = PageIdUtils.pageId(PageIdAllocator.INDEX_PARTITION, (byte) 0, i);
        try {
            pageStore.read(pageId, buf, false);
        } catch (IgniteDataIntegrityViolationException ignored) {
        // sometimes we try to access an invalid page, in which case this exception will be thrown.
        // We simply ignore it and try to access other pages.
        }
        if (PageIO.isIndexPage(PageIO.getType(buf)))
            result.add(PageIO.getPageId(buf));
        buf.clear();
    }
    return result;
}