Example usage for java.util.concurrent.locks ReadWriteLock writeLock

Introduction

In this page you can find the example usage for java.util.concurrent.locks ReadWriteLock writeLock.

Prototype

Lock writeLock();

Source Link

Document

Returns the lock used for writing.

Usage

From source file:org.hsweb.web.datasource.dynamic.DynamicDataSourceServiceImpl.java

protected CacheInfo getCache(String id) {
    DynamicDataSource.useDefault();//  ww  w.jav a2  s .  c  o  m
    try {
        DataSource old = dataSourceService.selectByPk(id);
        if (old == null || old.getEnabled() != 1)
            throw new NotFoundException("????");

        //?
        ReadWriteLock readWriteLock = lockFactory.createReadWriteLock("dynamic.ds." + id);

        readWriteLock.readLock().tryLock();
        CacheInfo cacheInfo = null;
        try {
            cacheInfo = cache.get(id);
            // ,hash
            if (cacheInfo != null && cacheInfo.getHash() == old.getHash())
                return cacheInfo;
        } finally {
            try {
                readWriteLock.readLock().unlock();
            } catch (Exception e) {
            }
        }
        readWriteLock.writeLock().tryLock();
        try {
            if (cacheInfo != null) {
                closeDataSource(cacheInfo.getDataSource());
            }
            //datasource
            javax.sql.DataSource dataSource = createDataSource(old);
            cacheInfo = new CacheInfo(old.getHash(), dataSource);
            cache.put(id, cacheInfo);
        } finally {
            try {
                readWriteLock.writeLock().unlock();
            } catch (Exception e) {
            }
        }
        return cacheInfo;
    } finally {
        DynamicDataSource.useLast();
    }
}

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From source file:org.apache.hadoop.crypto.key.JavaKeyStoreProvider.java

private JavaKeyStoreProvider(URI uri, Configuration conf) throws IOException {
    super(conf);//from  www.j  a va 2 s .c  o m
    this.uri = uri;
    path = ProviderUtils.unnestUri(uri);
    fs = path.getFileSystem(conf);
    // Get the password file from the conf, if not present from the user's
    // environment var
    if (System.getenv().containsKey(KEYSTORE_PASSWORD_ENV_VAR)) {
        password = System.getenv(KEYSTORE_PASSWORD_ENV_VAR).toCharArray();
    }
    if (password == null) {
        String pwFile = conf.get(KEYSTORE_PASSWORD_FILE_KEY);
        if (pwFile != null) {
            ClassLoader cl = Thread.currentThread().getContextClassLoader();
            URL pwdFile = cl.getResource(pwFile);
            if (pwdFile == null) {
                // Provided Password file does not exist
                throw new IOException("Password file does not exists");
            }
            try (InputStream is = pwdFile.openStream()) {
                password = IOUtils.toString(is).trim().toCharArray();
            }
        }
    }
    if (password == null) {
        password = KEYSTORE_PASSWORD_DEFAULT;
    }
    try {
        Path oldPath = constructOldPath(path);
        Path newPath = constructNewPath(path);
        keyStore = KeyStore.getInstance(SCHEME_NAME);
        FsPermission perm = null;
        if (fs.exists(path)) {
            // flush did not proceed to completion
            // _NEW should not exist
            if (fs.exists(newPath)) {
                throw new IOException(String.format("Keystore not loaded due to some inconsistency "
                        + "('%s' and '%s' should not exist together)!!", path, newPath));
            }
            perm = tryLoadFromPath(path, oldPath);
        } else {
            perm = tryLoadIncompleteFlush(oldPath, newPath);
        }
        // Need to save off permissions in case we need to
        // rewrite the keystore in flush()
        permissions = perm;
    } catch (KeyStoreException e) {
        throw new IOException("Can't create keystore", e);
    } catch (NoSuchAlgorithmException e) {
        throw new IOException("Can't load keystore " + path, e);
    } catch (CertificateException e) {
        throw new IOException("Can't load keystore " + path, e);
    }
    ReadWriteLock lock = new ReentrantReadWriteLock(true);
    readLock = lock.readLock();
    writeLock = lock.writeLock();
}

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From source file:org.apache.tajo.master.querymaster.Query.java

public Query(final QueryMasterTask.QueryMasterTaskContext context, final QueryId id, final long appSubmitTime,
        final String queryStr, final EventHandler eventHandler, final MasterPlan plan) {
    this.context = context;
    this.systemConf = context.getConf();
    this.id = id;
    this.clock = context.getClock();
    this.appSubmitTime = appSubmitTime;
    this.queryStr = queryStr;
    this.stages = Maps.newConcurrentMap();
    this.eventHandler = eventHandler;
    this.plan = plan;
    this.cursor = new ExecutionBlockCursor(plan, true);

    StringBuilder sb = new StringBuilder("\n=======================================================");
    sb.append("\nThe order of execution: \n");
    int order = 1;
    while (cursor.hasNext()) {
        ExecutionBlock currentEB = cursor.nextBlock();
        sb.append("\n").append(order).append(": ").append(currentEB.getId());
        order++;// w w w.j a  va 2 s.co m
    }
    sb.append("\n=======================================================");
    LOG.info(sb);
    cursor.reset();

    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();

    stateMachine = stateMachineFactory.make(this);
    queryState = stateMachine.getCurrentState();
}

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From source file:org.apache.tajo.master.SubQuery.java

public SubQuery(QueryContext context, ExecutionBlock block, StorageManager sm) {
    this.context = context;
    this.block = block;
    this.sm = sm;
    this.eventHandler = context.getEventHandler();

    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();
    stateMachine = stateMachineFactory.make(this);
}

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From source file:net.myrrix.online.ServerRecommender.java

private static float[] getFeatures(long id, FastByIDMap<float[]> matrix, ReadWriteLock lock) {
    float[] features;
    Lock readLock = lock.readLock();
    readLock.lock();//from   w  ww .  jav a 2s .c o m
    try {
        features = matrix.get(id);
        if (features == null) {
            int numFeatures = countFeatures(matrix);
            if (numFeatures > 0) {
                features = new float[numFeatures];
                Lock writeLock = lock.writeLock();
                readLock.unlock();
                writeLock.lock();
                try {
                    matrix.put(id, features);
                } finally {
                    readLock.lock();
                    writeLock.unlock();
                }
            }
        }
    } finally {
        readLock.unlock();
    }
    return features;
}

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From source file:org.apache.tajo.master.querymaster.QueryUnit.java

public QueryUnit(Configuration conf, QueryUnitAttemptScheduleContext scheduleContext, QueryUnitId id,
        boolean isLeafTask, EventHandler eventHandler) {
    this.systemConf = conf;
    this.taskId = id;
    this.eventHandler = eventHandler;
    this.isLeafTask = isLeafTask;
    scan = new ArrayList<ScanNode>();
    fetchMap = Maps.newHashMap();//from  w  w w .  j  a v  a  2s . com
    fragMap = Maps.newHashMap();
    shuffleFileOutputs = new ArrayList<ShuffleFileOutput>();
    attempts = Collections.emptyMap();
    lastAttemptId = null;
    nextAttempt = -1;
    failedAttempts = 0;

    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();
    this.scheduleContext = scheduleContext;

    stateMachine = stateMachineFactory.make(this);
    totalFragmentNum = 0;
}

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From source file:org.apache.tajo.querymaster.Task.java

public Task(Configuration conf, TaskAttemptScheduleContext scheduleContext, TaskId id, boolean isLeafTask,
        EventHandler eventHandler) {
    this.systemConf = conf;
    this.taskId = id;
    this.eventHandler = eventHandler;
    this.isLeafTask = isLeafTask;
    scan = new ArrayList<>();
    fetchMap = Maps.newHashMap();// w  w  w .  j ava  2s.  c  o m
    fragMap = Maps.newHashMap();
    shuffleFileOutputs = new ArrayList<>();
    attempts = Collections.emptyMap();
    lastAttemptId = null;
    nextAttempt = -1;
    failedAttempts = 0;

    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();
    this.scheduleContext = scheduleContext;

    stateMachine = stateMachineFactory.make(this);
    totalFragmentNum = 0;
    maxUrlLength = conf.getInt(ConfVars.PULLSERVER_FETCH_URL_MAX_LENGTH.name(),
            ConfVars.PULLSERVER_FETCH_URL_MAX_LENGTH.defaultIntVal);
}

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From source file:org.apache.tajo.master.querymaster.Task.java

public Task(Configuration conf, TaskAttemptScheduleContext scheduleContext, TaskId id, boolean isLeafTask,
        EventHandler eventHandler) {
    this.systemConf = conf;
    this.taskId = id;
    this.eventHandler = eventHandler;
    this.isLeafTask = isLeafTask;
    scan = new ArrayList<ScanNode>();
    fetchMap = Maps.newHashMap();/*from ww w  . j av a  2  s  .co  m*/
    fragMap = Maps.newHashMap();
    shuffleFileOutputs = new ArrayList<ShuffleFileOutput>();
    attempts = Collections.emptyMap();
    lastAttemptId = null;
    nextAttempt = -1;
    failedAttempts = 0;

    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    this.readLock = readWriteLock.readLock();
    this.writeLock = readWriteLock.writeLock();
    this.scheduleContext = scheduleContext;

    stateMachine = stateMachineFactory.make(this);
    totalFragmentNum = 0;
}

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From source file:org.nabucco.alfresco.enhScriptEnv.common.webscripts.processor.EnhancedJSScriptProcessor.java

protected void updateScriptCache(final Map<String, Script> cache, final ReadWriteLock lock, final String key,
        final Script script) {
    lock.writeLock().lock();
    try {//from   ww w .j  a  v a2  s .com
        cache.put(key, script);

        if (cache.size() > this.maxScriptCacheSize) {
            final Iterator<String> keyIterator = cache.keySet().iterator();
            while (cache.size() > this.maxScriptCacheSize) {
                final String keyToRemove = keyIterator.next();
                cache.remove(keyToRemove);
            }
        }
    } finally {
        lock.writeLock().unlock();
    }
}

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From source file:org.eclipse.orion.internal.server.core.metastore.SimpleMetaStoreV1.java

public void deleteUser(String userId) throws CoreException {
    ReadWriteLock lock = getLockForUser(userId);
    lock.writeLock().lock();
    try {//from   ww w.  j a va2 s  .co m
        UserInfo userInfo;
        try {
            userInfo = readUser(userId);
        } catch (CoreException exception) {
            throw new CoreException(new Status(IStatus.ERROR, ServerConstants.PI_SERVER_CORE, 1,
                    "SimpleMetaStore.deleteUser: could not delete user with id: " + userId
                            + ", user does not exist.",
                    null));
        }

        // First delete the workspaces
        for (String workspaceId : userInfo.getWorkspaceIds()) {
            deleteWorkspace(userId, workspaceId);
        }

        File userMetaFolder = SimpleMetaStoreUtil.readMetaUserFolder(getRootLocation(), userId);
        if (!SimpleMetaStoreUtil.deleteMetaFile(userMetaFolder, SimpleMetaStore.USER)) {
            throw new CoreException(new Status(IStatus.ERROR, ServerConstants.PI_SERVER_CORE, 1,
                    "SimpleMetaStore.deleteUser: could not delete user: " + userId, null));
        }
        if (!SimpleMetaStoreUtil.deleteMetaUserFolder(userMetaFolder, userId)) {
            throw new CoreException(new Status(IStatus.ERROR, ServerConstants.PI_SERVER_CORE, 1,
                    "SimpleMetaStore.deleteUser: could not delete user: " + userId, null));
        }
    } finally {
        lock.writeLock().unlock();
    }
}

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