Examples with FileLock java.nio.channels.FileLock used on opensource projects

Example 66 with FileLock

use of java.nio.channels.FileLock in project graal by oracle.

the class NativeImageServer method getServerInstance.

@SuppressWarnings("try")
private Server getServerInstance(LinkedHashSet<Path> classpath, LinkedHashSet<Path> bootClasspath, LinkedHashSet<String> javaArgs) {
    Server[] result = { null };
    /* Important - Creating new servers is a machine-exclusive operation */
    withFileChannel(getMachineDir().resolve("create-server.lock"), lockFileChannel -> {
        try (FileLock lock = lockFileChannel(lockFileChannel)) {
            /* Ensure that all dead server entries are gone before we start */
            cleanupServers(false, false, true);
            /* Determine how many ports are allowed to get used for build-servers */
            String maxPortsStr = loadProperties(getMachineDir().resolve(machineProperties)).get(pKeyMaxPorts);
            if (maxPortsStr == null || maxPortsStr.isEmpty()) {
                maxPortsStr = getUserConfigProperties().get(pKeyMaxPorts);
            }
            int maxPorts;
            if (maxPortsStr == null || maxPortsStr.isEmpty()) {
                maxPorts = 2;
            } else {
                maxPorts = Math.max(1, Integer.parseInt(maxPortsStr));
            }
            /* Maximize reuse by using same VM mem-args for all server-based image builds */
            String xmxValueStr = getXmxValue(maxPorts);
            replaceArg(javaArgs, oXmx, xmxValueStr);
            String xmsValueStr = getXmsValue();
            long xmxValue = SubstrateOptionsParser.parseLong(xmxValueStr);
            long xmsValue = SubstrateOptionsParser.parseLong(xmsValueStr);
            if (Word.unsigned(xmsValue).aboveThan(Word.unsigned(xmxValue))) {
                xmsValueStr = Long.toUnsignedString(xmxValue);
            }
            replaceArg(javaArgs, oXms, xmsValueStr);
            Path sessionDir = getSessionDir();
            String serverUID = imageServerUID(classpath, bootClasspath, javaArgs);
            Path serverDir = sessionDir.resolve(serverDirPrefix + serverUID);
            if (Files.isDirectory(serverDir)) {
                try {
                    Server server = new Server(serverDir);
                    if (!server.isAlive()) {
                        throw showError("Found defunct server:" + server.getServerInfo());
                    }
                    showVerboseMessage(verboseServer, "Reuse running server: " + server);
                    result[0] = server;
                } catch (Exception e) {
                    throw showError("Found corrupt ServerDir: " + serverDir, e);
                }
            } else {
                int serverPort = acquirePortNumber(maxPorts);
                if (serverPort < 0) {
                    /* Server limit reached */
                    showVerboseMessage(verboseServer, "Server limit reached -> remove least recently used server");
                    /* Shutdown least recently used within session */
                    Server victim = findVictim(getSessionDirs(false));
                    /* If none found also consider servers from other sessions on machine */
                    if (victim == null) {
                        victim = findVictim(getSessionDirs(true));
                    }
                    if (victim != null) {
                        showVerboseMessage(verboseServer, "Selected server to remove " + victim);
                        victim.shutdown();
                        serverPort = acquirePortNumber(maxPorts);
                        if (serverPort < 0) {
                            showWarning("Cannot acquire new server port despite removing " + victim);
                        }
                    } else {
                        showWarning("Native image server limit exceeded. Use options --server{-list,-shutdown[-all]} to fix the problem.");
                    }
                }
                if (serverPort >= 0) {
                    /* Instantiate new server and write properties file */
                    Server server = startServer(serverDir, serverPort, classpath, bootClasspath, javaArgs);
                    if (server != null) {
                        showVerboseMessage(verboseServer, "Created new server: " + server);
                    }
                    result[0] = server;
                }
            }
        } catch (IOException e) {
            throw showError("ServerInstance-creation locking failed", e);
        }
    });
    return result[0];
}

Example 67 with FileLock

use of java.nio.channels.FileLock in project graal by oracle.

the class NativeImageServer method lockFileChannel.

private FileLock lockFileChannel(FileChannel channel) throws IOException {
    Thread lockWatcher = new Thread(() -> {
        try {
            Thread.sleep(TimeUnit.MINUTES.toMillis(10));
            try {
                showWarning("Timeout while waiting for FileChannel.lock");
                /* Trigger AsynchronousCloseException in channel.lock() */
                channel.close();
            } catch (IOException e) {
                throw showError("LockWatcher closing FileChannel of LockFile failed", e);
            }
        } catch (InterruptedException e) {
        /* Sleep interrupted -> Lock acquired") */
        }
    });
    lockWatcher.start();
    FileLock lock = channel.lock();
    lockWatcher.interrupt();
    return lock;
}

Example 68 with FileLock

use of java.nio.channels.FileLock in project graal by oracle.

the class NativeImageServer method acquirePortNumber.

@SuppressWarnings("try")
private int acquirePortNumber(int maxPorts) {
    int firstPortNumber = 26681;
    int[] selectedPort = { -1 };
    Path machineDir = getMachineDir();
    withLockDirFileChannel(machineDir, lockFileChannel -> {
        try (FileLock lock = lockFileChannel(lockFileChannel)) {
            Path machinePropertiesPath = machineDir.resolve(machineProperties);
            TreeSet<Integer> inUseSet = new TreeSet<>();
            Properties mp = new Properties();
            if (Files.isReadable(machinePropertiesPath)) {
                try (InputStream is = Files.newInputStream(machinePropertiesPath)) {
                    mp.load(is);
                    String portInUseValue = mp.getProperty(pKeyPortsInUse);
                    if (portInUseValue != null && !portInUseValue.isEmpty()) {
                        inUseSet.addAll(Arrays.stream(portInUseValue.split(" ")).map(Integer::parseInt).collect(Collectors.toList()));
                    }
                }
            }
            for (int candidatePort = firstPortNumber; candidatePort < firstPortNumber + maxPorts; candidatePort++) {
                if (!inUseSet.contains(candidatePort)) {
                    selectedPort[0] = candidatePort;
                    inUseSet.add(selectedPort[0]);
                    break;
                }
            }
            mp.setProperty(pKeyPortsInUse, inUseSet.stream().map(String::valueOf).collect(Collectors.joining(" ")));
            try (OutputStream os = Files.newOutputStream(machinePropertiesPath)) {
                mp.store(os, "");
            }
        } catch (IOException e) {
            throw showError("Acquiring new server port number locking failed", e);
        }
    });
    if (selectedPort[0] < firstPortNumber) {
        showVerboseMessage(verboseServer, "Acquired new server port number failed");
    }
    return selectedPort[0];
}

Example 69 with FileLock

use of java.nio.channels.FileLock in project h2database by h2database.

the class TestFileSystem method testSimpleExpandTruncateSize.

private void testSimpleExpandTruncateSize() throws Exception {
    String f = "memFS:" + getBaseDir() + "/fs/test.data";
    FileUtils.createDirectories("memFS:" + getBaseDir() + "/fs");
    FileChannel c = FileUtils.open(f, "rw");
    c.position(4000);
    c.write(ByteBuffer.wrap(new byte[1]));
    FileLock lock = c.tryLock();
    c.truncate(0);
    if (lock != null) {
        lock.release();
    }
    c.close();
    FileUtils.deleteRecursive("memFS:", false);
}

Example 70 with FileLock

use of java.nio.channels.FileLock in project h2database by h2database.

the class FileRetryOnInterrupt method tryLock.

@Override
public synchronized FileLock tryLock(long position, long size, boolean shared) throws IOException {
    FileLock l = channel.tryLock(position, size, shared);
    if (l == null) {
        return null;
    }
    lock = new FileLockRetry(l, this);
    return lock;
}