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

Example 1 with FileLock

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

the class FileLister method tryUnlockDatabase.

/**
 * Try to lock the database, and then unlock it. If this worked, the
 * .lock.db file will be removed.
 *
 * @param files the database files to check
 * @param message the text to include in the error message
 * @throws SQLException if it failed
 */
public static void tryUnlockDatabase(List<String> files, String message) throws SQLException {
    for (String fileName : files) {
        if (fileName.endsWith(Constants.SUFFIX_LOCK_FILE)) {
            FileLock lock = new FileLock(new TraceSystem(null), fileName, Constants.LOCK_SLEEP);
            try {
                lock.lock(FileLockMethod.FILE);
                lock.unlock();
            } catch (DbException e) {
                throw DbException.get(ErrorCode.CANNOT_CHANGE_SETTING_WHEN_OPEN_1, message).getSQLException();
            }
        } else if (fileName.endsWith(Constants.SUFFIX_MV_FILE)) {
            try (FileChannel f = FilePath.get(fileName).open("r")) {
                java.nio.channels.FileLock lock = f.tryLock(0, Long.MAX_VALUE, true);
                lock.release();
            } catch (Exception e) {
                throw DbException.get(ErrorCode.CANNOT_CHANGE_SETTING_WHEN_OPEN_1, e, message).getSQLException();
            }
        }
    }
}

Example 2 with FileLock

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

the class TestFileLock method testFutureModificationDate.

private void testFutureModificationDate() throws Exception {
    File f = new File(getFile());
    f.delete();
    f.createNewFile();
    f.setLastModified(System.currentTimeMillis() + 10000);
    FileLock lock = new FileLock(new TraceSystem(null), getFile(), Constants.LOCK_SLEEP);
    lock.lock(FileLockMethod.FILE);
    lock.unlock();
}

Example 3 with FileLock

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

the class FileStore method open.

/**
 * Try to open the file.
 *
 * @param fileName the file name
 * @param readOnly whether the file should only be opened in read-only mode,
 *            even if the file is writable
 * @param encryptionKey the encryption key, or null if encryption is not
 *            used
 */
public void open(String fileName, boolean readOnly, char[] encryptionKey) {
    if (file != null) {
        return;
    }
    if (fileName != null) {
        // ensure the Cache file system is registered
        FilePathCache.INSTANCE.getScheme();
        FilePath p = FilePath.get(fileName);
        // if no explicit scheme was specified, NIO is used
        if (p instanceof FilePathDisk && !fileName.startsWith(p.getScheme() + ":")) {
            // ensure the NIO file system is registered
            FilePathNio.class.getName();
            fileName = "nio:" + fileName;
        }
    }
    this.fileName = fileName;
    FilePath f = FilePath.get(fileName);
    FilePath parent = f.getParent();
    if (parent != null && !parent.exists()) {
        throw DataUtils.newIllegalArgumentException("Directory does not exist: {0}", parent);
    }
    if (f.exists() && !f.canWrite()) {
        readOnly = true;
    }
    this.readOnly = readOnly;
    try {
        file = f.open(readOnly ? "r" : "rw");
        if (encryptionKey != null) {
            byte[] key = FilePathEncrypt.getPasswordBytes(encryptionKey);
            encryptedFile = file;
            file = new FilePathEncrypt.FileEncrypt(fileName, key, file);
        }
        try {
            if (readOnly) {
                fileLock = file.tryLock(0, Long.MAX_VALUE, true);
            } else {
                fileLock = file.tryLock();
            }
        } catch (OverlappingFileLockException e) {
            throw DataUtils.newIllegalStateException(DataUtils.ERROR_FILE_LOCKED, "The file is locked: {0}", fileName, e);
        }
        if (fileLock == null) {
            throw DataUtils.newIllegalStateException(DataUtils.ERROR_FILE_LOCKED, "The file is locked: {0}", fileName);
        }
        fileSize = file.size();
    } catch (IOException e) {
        throw DataUtils.newIllegalStateException(DataUtils.ERROR_READING_FAILED, "Could not open file {0}", fileName, e);
    }
}

Example 4 with FileLock

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

the class Database method isReconnectNeeded.

/**
 * Check if the contents of the database was changed and therefore it is
 * required to re-connect. This method waits until pending changes are
 * completed. If a pending change takes too long (more than 2 seconds), the
 * pending change is broken (removed from the properties file).
 *
 * @return true if reconnecting is required
 */
public boolean isReconnectNeeded() {
    if (fileLockMethod != FileLockMethod.SERIALIZED) {
        return false;
    }
    if (reconnectChangePending) {
        return false;
    }
    long now = System.nanoTime();
    if (now < reconnectCheckNext) {
        return false;
    }
    reconnectCheckNext = now + reconnectCheckDelayNs;
    if (lock == null) {
        lock = new FileLock(traceSystem, databaseName + Constants.SUFFIX_LOCK_FILE, Constants.LOCK_SLEEP);
    }
    try {
        Properties prop = lock.load(), first = prop;
        while (true) {
            if (prop.equals(reconnectLastLock)) {
                return false;
            }
            if (prop.getProperty("changePending", null) == null) {
                break;
            }
            if (System.nanoTime() > now + reconnectCheckDelayNs * 10) {
                if (first.equals(prop)) {
                    // the writing process didn't update the file -
                    // it may have terminated
                    lock.setProperty("changePending", null);
                    lock.save();
                    break;
                }
            }
            trace.debug("delay (change pending)");
            Thread.sleep(TimeUnit.NANOSECONDS.toMillis(reconnectCheckDelayNs));
            prop = lock.load();
        }
        reconnectLastLock = prop;
    } catch (Exception e) {
        // DbException, InterruptedException
        trace.error(e, "readOnly {0}", readOnly);
    // ignore
    }
    return true;
}

Example 5 with FileLock

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

the class Database method open.

private synchronized void open(int traceLevelFile, int traceLevelSystemOut) {
    if (persistent) {
        String dataFileName = databaseName + Constants.SUFFIX_OLD_DATABASE_FILE;
        boolean existsData = FileUtils.exists(dataFileName);
        String pageFileName = databaseName + Constants.SUFFIX_PAGE_FILE;
        String mvFileName = databaseName + Constants.SUFFIX_MV_FILE;
        boolean existsPage = FileUtils.exists(pageFileName);
        boolean existsMv = FileUtils.exists(mvFileName);
        if (existsData && (!existsPage && !existsMv)) {
            throw DbException.get(ErrorCode.FILE_VERSION_ERROR_1, "Old database: " + dataFileName + " - please convert the database " + "to a SQL script and re-create it.");
        }
        if (existsPage && !FileUtils.canWrite(pageFileName)) {
            readOnly = true;
        }
        if (existsMv && !FileUtils.canWrite(mvFileName)) {
            readOnly = true;
        }
        if (existsPage && !existsMv) {
            dbSettings.mvStore = false;
        }
        if (readOnly) {
            if (traceLevelFile >= TraceSystem.DEBUG) {
                String traceFile = Utils.getProperty("java.io.tmpdir", ".") + "/" + "h2_" + System.currentTimeMillis();
                traceSystem = new TraceSystem(traceFile + Constants.SUFFIX_TRACE_FILE);
            } else {
                traceSystem = new TraceSystem(null);
            }
        } else {
            traceSystem = new TraceSystem(databaseName + Constants.SUFFIX_TRACE_FILE);
        }
        traceSystem.setLevelFile(traceLevelFile);
        traceSystem.setLevelSystemOut(traceLevelSystemOut);
        trace = traceSystem.getTrace(Trace.DATABASE);
        trace.info("opening {0} (build {1})", databaseName, Constants.BUILD_ID);
        if (autoServerMode) {
            if (readOnly || fileLockMethod == FileLockMethod.NO || fileLockMethod == FileLockMethod.SERIALIZED || fileLockMethod == FileLockMethod.FS || !persistent) {
                throw DbException.getUnsupportedException("autoServerMode && (readOnly || " + "fileLockMethod == NO || " + "fileLockMethod == SERIALIZED || " + "fileLockMethod == FS || " + "inMemory)");
            }
        }
        String lockFileName = databaseName + Constants.SUFFIX_LOCK_FILE;
        if (readOnly) {
            if (FileUtils.exists(lockFileName)) {
                throw DbException.get(ErrorCode.DATABASE_ALREADY_OPEN_1, "Lock file exists: " + lockFileName);
            }
        }
        if (!readOnly && fileLockMethod != FileLockMethod.NO) {
            if (fileLockMethod != FileLockMethod.FS) {
                lock = new FileLock(traceSystem, lockFileName, Constants.LOCK_SLEEP);
                lock.lock(fileLockMethod);
                if (autoServerMode) {
                    startServer(lock.getUniqueId());
                }
            }
        }
        if (SysProperties.MODIFY_ON_WRITE) {
            while (isReconnectNeeded()) {
            // wait until others stopped writing
            }
        } else {
            while (isReconnectNeeded() && !beforeWriting()) {
            // wait until others stopped writing and
            // until we can write (the file is not yet open -
            // no need to re-connect)
            }
        }
        deleteOldTempFiles();
        starting = true;
        if (SysProperties.MODIFY_ON_WRITE) {
            try {
                getPageStore();
            } catch (DbException e) {
                if (e.getErrorCode() != ErrorCode.DATABASE_IS_READ_ONLY) {
                    throw e;
                }
                pageStore = null;
                while (!beforeWriting()) {
                // wait until others stopped writing and
                // until we can write (the file is not yet open -
                // no need to re-connect)
                }
                getPageStore();
            }
        } else {
            getPageStore();
        }
        starting = false;
        if (mvStore == null) {
            writer = WriterThread.create(this, writeDelay);
        } else {
            setWriteDelay(writeDelay);
        }
    } else {
        if (autoServerMode) {
            throw DbException.getUnsupportedException("autoServerMode && inMemory");
        }
        traceSystem = new TraceSystem(null);
        trace = traceSystem.getTrace(Trace.DATABASE);
        if (dbSettings.mvStore) {
            getPageStore();
        }
    }
    systemUser = new User(this, 0, SYSTEM_USER_NAME, true);
    mainSchema = new Schema(this, 0, Constants.SCHEMA_MAIN, systemUser, true);
    infoSchema = new Schema(this, -1, "INFORMATION_SCHEMA", systemUser, true);
    schemas.put(mainSchema.getName(), mainSchema);
    schemas.put(infoSchema.getName(), infoSchema);
    publicRole = new Role(this, 0, Constants.PUBLIC_ROLE_NAME, true);
    roles.put(Constants.PUBLIC_ROLE_NAME, publicRole);
    systemUser.setAdmin(true);
    systemSession = new Session(this, systemUser, ++nextSessionId);
    lobSession = new Session(this, systemUser, ++nextSessionId);
    CreateTableData data = new CreateTableData();
    ArrayList<Column> cols = data.columns;
    Column columnId = new Column("ID", Value.INT);
    columnId.setNullable(false);
    cols.add(columnId);
    cols.add(new Column("HEAD", Value.INT));
    cols.add(new Column("TYPE", Value.INT));
    cols.add(new Column("SQL", Value.STRING));
    boolean create = true;
    if (pageStore != null) {
        create = pageStore.isNew();
    }
    data.tableName = "SYS";
    data.id = 0;
    data.temporary = false;
    data.persistData = persistent;
    data.persistIndexes = persistent;
    data.create = create;
    data.isHidden = true;
    data.session = systemSession;
    meta = mainSchema.createTable(data);
    IndexColumn[] pkCols = IndexColumn.wrap(new Column[] { columnId });
    metaIdIndex = meta.addIndex(systemSession, "SYS_ID", 0, pkCols, IndexType.createPrimaryKey(false, false), true, null);
    objectIds.set(0);
    starting = true;
    Cursor cursor = metaIdIndex.find(systemSession, null, null);
    ArrayList<MetaRecord> records = New.arrayList();
    while (cursor.next()) {
        MetaRecord rec = new MetaRecord(cursor.get());
        objectIds.set(rec.getId());
        records.add(rec);
    }
    Collections.sort(records);
    synchronized (systemSession) {
        for (MetaRecord rec : records) {
            rec.execute(this, systemSession, eventListener);
        }
    }
    if (mvStore != null) {
        mvStore.initTransactions();
        mvStore.removeTemporaryMaps(objectIds);
    }
    recompileInvalidViews(systemSession);
    starting = false;
    if (!readOnly) {
        // set CREATE_BUILD in a new database
        String name = SetTypes.getTypeName(SetTypes.CREATE_BUILD);
        if (settings.get(name) == null) {
            Setting setting = new Setting(this, allocateObjectId(), name);
            setting.setIntValue(Constants.BUILD_ID);
            lockMeta(systemSession);
            addDatabaseObject(systemSession, setting);
        }
        // mark all ids used in the page store
        if (pageStore != null) {
            BitSet f = pageStore.getObjectIds();
            for (int i = 0, len = f.length(); i < len; i++) {
                if (f.get(i) && !objectIds.get(i)) {
                    trace.info("unused object id: " + i);
                    objectIds.set(i);
                }
            }
        }
    }
    getLobStorage().init();
    systemSession.commit(true);
    trace.info("opened {0}", databaseName);
    if (checkpointAllowed > 0) {
        afterWriting();
    }
}