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

Example 11 with Page

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

the class WebThread method process.

@SuppressWarnings("unchecked")
private boolean process() throws IOException {
    boolean keepAlive = false;
    String head = readHeaderLine();
    if (head.startsWith("GET ") || head.startsWith("POST ")) {
        int begin = head.indexOf('/'), end = head.lastIndexOf(' ');
        String file;
        if (begin < 0 || end < begin) {
            file = "";
        } else {
            file = head.substring(begin + 1, end).trim();
        }
        trace(head + ": " + file);
        file = getAllowedFile(file);
        attributes = new Properties();
        int paramIndex = file.indexOf('?');
        session = null;
        if (paramIndex >= 0) {
            String attrib = file.substring(paramIndex + 1);
            parseAttributes(attrib);
            String sessionId = attributes.getProperty("jsessionid");
            file = file.substring(0, paramIndex);
            session = server.getSession(sessionId);
        }
        keepAlive = parseHeader();
        String hostAddr = socket.getInetAddress().getHostAddress();
        file = processRequest(file, hostAddr);
        if (file.length() == 0) {
            // asynchronous request
            return true;
        }
        String message;
        byte[] bytes;
        if (cache && ifModifiedSince != null && ifModifiedSince.equals(server.getStartDateTime())) {
            bytes = null;
            message = "HTTP/1.1 304 Not Modified\r\n";
        } else {
            bytes = server.getFile(file);
            if (bytes == null) {
                message = "HTTP/1.1 404 Not Found\r\n";
                bytes = ("File not found: " + file).getBytes(StandardCharsets.UTF_8);
                message += "Content-Length: " + bytes.length + "\r\n";
            } else {
                if (session != null && file.endsWith(".jsp")) {
                    String page = new String(bytes, StandardCharsets.UTF_8);
                    if (SysProperties.CONSOLE_STREAM) {
                        Iterator<String> it = (Iterator<String>) session.map.remove("chunks");
                        if (it != null) {
                            message = "HTTP/1.1 200 OK\r\n";
                            message += "Content-Type: " + mimeType + "\r\n";
                            message += "Cache-Control: no-cache\r\n";
                            message += "Transfer-Encoding: chunked\r\n";
                            message += "\r\n";
                            trace(message);
                            output.write(message.getBytes());
                            while (it.hasNext()) {
                                String s = it.next();
                                s = PageParser.parse(s, session.map);
                                bytes = s.getBytes(StandardCharsets.UTF_8);
                                if (bytes.length == 0) {
                                    continue;
                                }
                                output.write(Integer.toHexString(bytes.length).getBytes());
                                output.write("\r\n".getBytes());
                                output.write(bytes);
                                output.write("\r\n".getBytes());
                                output.flush();
                            }
                            output.write("0\r\n\r\n".getBytes());
                            output.flush();
                            return keepAlive;
                        }
                    }
                    page = PageParser.parse(page, session.map);
                    bytes = page.getBytes(StandardCharsets.UTF_8);
                }
                message = "HTTP/1.1 200 OK\r\n";
                message += "Content-Type: " + mimeType + "\r\n";
                if (!cache) {
                    message += "Cache-Control: no-cache\r\n";
                } else {
                    message += "Cache-Control: max-age=10\r\n";
                    message += "Last-Modified: " + server.getStartDateTime() + "\r\n";
                }
                message += "Content-Length: " + bytes.length + "\r\n";
            }
        }
        message += "\r\n";
        trace(message);
        output.write(message.getBytes());
        if (bytes != null) {
            output.write(bytes);
        }
        output.flush();
    }
    return keepAlive;
}

Example 12 with Page

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

the class PageLog method removeUntil.

/**
 * Remove all pages until the given data page.
 *
 * @param trunkPage the first trunk page
 * @param firstDataPageToKeep the first data page to keep
 * @return the trunk page of the data page to keep
 */
private int removeUntil(int trunkPage, int firstDataPageToKeep) {
    trace.debug("log.removeUntil " + trunkPage + " " + firstDataPageToKeep);
    int last = trunkPage;
    while (true) {
        Page p = store.getPage(trunkPage);
        PageStreamTrunk t = (PageStreamTrunk) p;
        if (t == null) {
            throw DbException.throwInternalError("log.removeUntil not found: " + firstDataPageToKeep + " last " + last);
        }
        logKey = t.getLogKey();
        last = t.getPos();
        if (t.contains(firstDataPageToKeep)) {
            return last;
        }
        trunkPage = t.getNextTrunk();
        IntArray list = new IntArray();
        list.add(t.getPos());
        for (int i = 0; ; i++) {
            int next = t.getPageData(i);
            if (next == -1) {
                break;
            }
            list.add(next);
        }
        freeLogPages(list);
        pageOut.free(t);
    }
}

Example 13 with Page

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

the class PageStore method writeVariableHeader.

private void writeVariableHeader() {
    trace.debug("writeVariableHeader");
    if (logMode == LOG_MODE_SYNC) {
        file.sync();
    }
    Data page = createData();
    page.writeInt(0);
    page.writeLong(getWriteCountTotal());
    page.writeInt(logKey);
    page.writeInt(logFirstTrunkPage);
    page.writeInt(logFirstDataPage);
    CRC32 crc = new CRC32();
    crc.update(page.getBytes(), 4, pageSize - 4);
    page.setInt(0, (int) crc.getValue());
    file.seek(pageSize);
    file.write(page.getBytes(), 0, pageSize);
    file.seek(pageSize + pageSize);
    file.write(page.getBytes(), 0, pageSize);
// don't increment the write counter, because it was just written
}

Example 14 with Page

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

the class PageStore method readVariableHeader.

private void readVariableHeader() {
    Data page = createData();
    for (int i = 1; ; i++) {
        if (i == 3) {
            throw DbException.get(ErrorCode.FILE_CORRUPTED_1, fileName);
        }
        page.reset();
        readPage(i, page);
        CRC32 crc = new CRC32();
        crc.update(page.getBytes(), 4, pageSize - 4);
        int expected = (int) crc.getValue();
        int got = page.readInt();
        if (expected == got) {
            writeCountBase = page.readLong();
            logKey = page.readInt();
            logFirstTrunkPage = page.readInt();
            logFirstDataPage = page.readInt();
            break;
        }
    }
}

Example 15 with Page

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

the class PageStore method getPage.

/**
 * Read a page from the store.
 *
 * @param pageId the page id
 * @return the page
 */
public synchronized Page getPage(int pageId) {
    Page p = (Page) cache.get(pageId);
    if (p != null) {
        return p;
    }
    Data data = createData();
    readPage(pageId, data);
    int type = data.readByte();
    if (type == Page.TYPE_EMPTY) {
        return null;
    }
    data.readShortInt();
    data.readInt();
    if (!checksumTest(data.getBytes(), pageId, pageSize)) {
        throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "wrong checksum");
    }
    switch(type & ~Page.FLAG_LAST) {
        case Page.TYPE_FREE_LIST:
            p = PageFreeList.read(this, data, pageId);
            break;
        case Page.TYPE_DATA_LEAF:
            {
                int indexId = data.readVarInt();
                PageIndex idx = metaObjects.get(indexId);
                if (idx == null) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "index not found " + indexId);
                }
                if (!(idx instanceof PageDataIndex)) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "not a data index " + indexId + " " + idx);
                }
                PageDataIndex index = (PageDataIndex) idx;
                if (statistics != null) {
                    statisticsIncrement(index.getTable().getName() + "." + index.getName() + " read");
                }
                p = PageDataLeaf.read(index, data, pageId);
                break;
            }
        case Page.TYPE_DATA_NODE:
            {
                int indexId = data.readVarInt();
                PageIndex idx = metaObjects.get(indexId);
                if (idx == null) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "index not found " + indexId);
                }
                if (!(idx instanceof PageDataIndex)) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "not a data index " + indexId + " " + idx);
                }
                PageDataIndex index = (PageDataIndex) idx;
                if (statistics != null) {
                    statisticsIncrement(index.getTable().getName() + "." + index.getName() + " read");
                }
                p = PageDataNode.read(index, data, pageId);
                break;
            }
        case Page.TYPE_DATA_OVERFLOW:
            {
                p = PageDataOverflow.read(this, data, pageId);
                if (statistics != null) {
                    statisticsIncrement("overflow read");
                }
                break;
            }
        case Page.TYPE_BTREE_LEAF:
            {
                int indexId = data.readVarInt();
                PageIndex idx = metaObjects.get(indexId);
                if (idx == null) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "index not found " + indexId);
                }
                if (!(idx instanceof PageBtreeIndex)) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "not a btree index " + indexId + " " + idx);
                }
                PageBtreeIndex index = (PageBtreeIndex) idx;
                if (statistics != null) {
                    statisticsIncrement(index.getTable().getName() + "." + index.getName() + " read");
                }
                p = PageBtreeLeaf.read(index, data, pageId);
                break;
            }
        case Page.TYPE_BTREE_NODE:
            {
                int indexId = data.readVarInt();
                PageIndex idx = metaObjects.get(indexId);
                if (idx == null) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "index not found " + indexId);
                }
                if (!(idx instanceof PageBtreeIndex)) {
                    throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "not a btree index " + indexId + " " + idx);
                }
                PageBtreeIndex index = (PageBtreeIndex) idx;
                if (statistics != null) {
                    statisticsIncrement(index.getTable().getName() + "." + index.getName() + " read");
                }
                p = PageBtreeNode.read(index, data, pageId);
                break;
            }
        case Page.TYPE_STREAM_TRUNK:
            p = PageStreamTrunk.read(this, data, pageId);
            break;
        case Page.TYPE_STREAM_DATA:
            p = PageStreamData.read(this, data, pageId);
            break;
        default:
            throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "page=" + pageId + " type=" + type);
    }
    cache.put(p);
    return p;
}