Examples with Page org.h2.mvstore.Page used on opensource projects

Example 26 with Page

use of org.h2.mvstore.Page in project h2database by h2database.

the class Recover method dumpPageStore.

private void dumpPageStore(PrintWriter writer, long pageCount) {
    Data s = Data.create(this, pageSize);
    for (long page = 3; page < pageCount; page++) {
        s = Data.create(this, pageSize);
        seek(page);
        store.readFully(s.getBytes(), 0, pageSize);
        dumpPage(writer, s, page, pageCount);
    }
}

Example 27 with Page

use of org.h2.mvstore.Page in project h2database by h2database.

the class Recover method dumpPageStore.

private void dumpPageStore(String fileName) {
    setDatabaseName(fileName.substring(0, fileName.length() - Constants.SUFFIX_PAGE_FILE.length()));
    PrintWriter writer = null;
    stat = new Stats();
    try {
        writer = getWriter(fileName, ".sql");
        writer.println("CREATE ALIAS IF NOT EXISTS READ_BLOB FOR \"" + this.getClass().getName() + ".readBlob\";");
        writer.println("CREATE ALIAS IF NOT EXISTS READ_CLOB FOR \"" + this.getClass().getName() + ".readClob\";");
        writer.println("CREATE ALIAS IF NOT EXISTS READ_BLOB_DB FOR \"" + this.getClass().getName() + ".readBlobDb\";");
        writer.println("CREATE ALIAS IF NOT EXISTS READ_CLOB_DB FOR \"" + this.getClass().getName() + ".readClobDb\";");
        resetSchema();
        store = FileStore.open(null, fileName, remove ? "rw" : "r");
        long length = store.length();
        try {
            store.init();
        } catch (Exception e) {
            writeError(writer, e);
        }
        Data s = Data.create(this, 128);
        seek(0);
        store.readFully(s.getBytes(), 0, 128);
        s.setPos(48);
        pageSize = s.readInt();
        int writeVersion = s.readByte();
        int readVersion = s.readByte();
        writer.println("-- pageSize: " + pageSize + " writeVersion: " + writeVersion + " readVersion: " + readVersion);
        if (pageSize < PageStore.PAGE_SIZE_MIN || pageSize > PageStore.PAGE_SIZE_MAX) {
            pageSize = Constants.DEFAULT_PAGE_SIZE;
            writer.println("-- ERROR: page size; using " + pageSize);
        }
        long pageCount = length / pageSize;
        parents = new int[(int) pageCount];
        s = Data.create(this, pageSize);
        for (long i = 3; i < pageCount; i++) {
            s.reset();
            seek(i);
            store.readFully(s.getBytes(), 0, 32);
            s.readByte();
            s.readShortInt();
            parents[(int) i] = s.readInt();
        }
        int logKey = 0, logFirstTrunkPage = 0, logFirstDataPage = 0;
        s = Data.create(this, pageSize);
        for (long i = 1; ; i++) {
            if (i == 3) {
                break;
            }
            s.reset();
            seek(i);
            store.readFully(s.getBytes(), 0, pageSize);
            CRC32 crc = new CRC32();
            crc.update(s.getBytes(), 4, pageSize - 4);
            int expected = (int) crc.getValue();
            int got = s.readInt();
            long writeCounter = s.readLong();
            int key = s.readInt();
            int firstTrunkPage = s.readInt();
            int firstDataPage = s.readInt();
            if (expected == got) {
                logKey = key;
                logFirstTrunkPage = firstTrunkPage;
                logFirstDataPage = firstDataPage;
            }
            writer.println("-- head " + i + ": writeCounter: " + writeCounter + " log " + key + ":" + firstTrunkPage + "/" + firstDataPage + " crc " + got + " (" + (expected == got ? "ok" : ("expected: " + expected)) + ")");
        }
        writer.println("-- log " + logKey + ":" + logFirstTrunkPage + "/" + logFirstDataPage);
        PrintWriter devNull = new PrintWriter(new OutputStream() {

            @Override
            public void write(int b) {
            // ignore
            }
        });
        dumpPageStore(devNull, pageCount);
        stat = new Stats();
        schema.clear();
        objectIdSet = new HashSet<>();
        dumpPageStore(writer, pageCount);
        writeSchema(writer);
        try {
            dumpPageLogStream(writer, logKey, logFirstTrunkPage, logFirstDataPage, pageCount);
        } catch (IOException e) {
        // ignore
        }
        writer.println("---- Statistics ----");
        writer.println("-- page count: " + pageCount + ", free: " + stat.free);
        long total = Math.max(1, stat.pageDataRows + stat.pageDataEmpty + stat.pageDataHead);
        writer.println("-- page data bytes: head " + stat.pageDataHead + ", empty " + stat.pageDataEmpty + ", rows " + stat.pageDataRows + " (" + (100 - 100L * stat.pageDataEmpty / total) + "% full)");
        for (int i = 0; i < stat.pageTypeCount.length; i++) {
            int count = stat.pageTypeCount[i];
            if (count > 0) {
                writer.println("-- " + getPageType(i) + " " + (100 * count / pageCount) + "%, " + count + " page(s)");
            }
        }
        writer.close();
    } catch (Throwable e) {
        writeError(writer, e);
    } finally {
        IOUtils.closeSilently(writer);
        closeSilently(store);
    }
}

Example 28 with Page

use of org.h2.mvstore.Page in project h2database by h2database.

the class BnfSyntax method getLink.

/**
 * Get the HTML link to the given token.
 *
 * @param bnf the BNF
 * @param token the token
 * @return the HTML link
 */
String getLink(Bnf bnf, String token) {
    RuleHead found = null;
    String key = Bnf.getRuleMapKey(token);
    for (int i = 0; i < token.length(); i++) {
        String test = StringUtils.toLowerEnglish(key.substring(i));
        RuleHead r = bnf.getRuleHead(test);
        if (r != null) {
            found = r;
            break;
        }
    }
    if (found == null) {
        return token;
    }
    String page = "grammar.html";
    if (found.getSection().startsWith("Data Types")) {
        page = "datatypes.html";
    } else if (found.getSection().startsWith("Functions")) {
        page = "functions.html";
    } else if (token.equals("@func@")) {
        return "<a href=\"functions.html\">Function</a>";
    } else if (found.getRule() instanceof RuleFixed) {
        found.getRule().accept(this);
        return html;
    }
    String link = found.getTopic().toLowerCase().replace(' ', '_');
    link = page + "#" + StringUtils.urlEncode(link);
    return "<a href=\"" + link + "\">" + token + "</a>";
}

Example 29 with Page

use of org.h2.mvstore.Page in project h2database by h2database.

the class MVStore method readPageChunkReferences.

private PageChildren readPageChunkReferences(int mapId, long pos, int parentChunk) {
    if (DataUtils.getPageType(pos) == DataUtils.PAGE_TYPE_LEAF) {
        return null;
    }
    PageChildren r;
    if (cacheChunkRef != null) {
        r = cacheChunkRef.get(pos);
    } else {
        r = null;
    }
    if (r == null) {
        // if possible, create it from the cached page
        if (cache != null) {
            Page p = cache.get(pos);
            if (p != null) {
                r = new PageChildren(p);
            }
        }
        if (r == null) {
            // page was not cached: read the data
            Chunk c = getChunk(pos);
            long filePos = c.block * BLOCK_SIZE;
            filePos += DataUtils.getPageOffset(pos);
            if (filePos < 0) {
                throw DataUtils.newIllegalStateException(DataUtils.ERROR_FILE_CORRUPT, "Negative position {0}; p={1}, c={2}", filePos, pos, c.toString());
            }
            long maxPos = (c.block + c.len) * BLOCK_SIZE;
            r = PageChildren.read(fileStore, pos, mapId, filePos, maxPos);
        }
        r.removeDuplicateChunkReferences();
        if (cacheChunkRef != null) {
            cacheChunkRef.put(pos, r, r.getMemory());
        }
    }
    if (r.children.length == 0) {
        int chunk = DataUtils.getPageChunkId(pos);
        if (chunk == parentChunk) {
            return null;
        }
    }
    return r;
}

Example 30 with Page

use of org.h2.mvstore.Page in project h2database by h2database.

the class MVTableEngine method init.

/**
 * Initialize the MVStore.
 *
 * @param db the database
 * @return the store
 */
public static Store init(final Database db) {
    Store store = db.getMvStore();
    if (store != null) {
        return store;
    }
    byte[] key = db.getFileEncryptionKey();
    String dbPath = db.getDatabasePath();
    MVStore.Builder builder = new MVStore.Builder();
    store = new Store();
    boolean encrypted = false;
    if (dbPath != null) {
        String fileName = dbPath + Constants.SUFFIX_MV_FILE;
        MVStoreTool.compactCleanUp(fileName);
        builder.fileName(fileName);
        builder.pageSplitSize(db.getPageSize());
        if (db.isReadOnly()) {
            builder.readOnly();
        } else {
            // possibly create the directory
            boolean exists = FileUtils.exists(fileName);
            if (exists && !FileUtils.canWrite(fileName)) {
            // read only
            } else {
                String dir = FileUtils.getParent(fileName);
                FileUtils.createDirectories(dir);
            }
        }
        if (key != null) {
            encrypted = true;
            char[] password = new char[key.length / 2];
            for (int i = 0; i < password.length; i++) {
                password[i] = (char) (((key[i + i] & 255) << 16) | ((key[i + i + 1]) & 255));
            }
            builder.encryptionKey(password);
        }
        if (db.getSettings().compressData) {
            builder.compress();
            // use a larger page split size to improve the compression ratio
            builder.pageSplitSize(64 * 1024);
        }
        builder.backgroundExceptionHandler(new UncaughtExceptionHandler() {

            @Override
            public void uncaughtException(Thread t, Throwable e) {
                db.setBackgroundException(DbException.convert(e));
            }
        });
    }
    store.open(db, builder, encrypted);
    db.setMvStore(store);
    return store;
}