Example usage for java.util.concurrent.locks ReentrantLock lock

Introduction

In this page you can find the example usage for java.util.concurrent.locks ReentrantLock lock.

Prototype

public void lock() 

Source Link

Document

Acquires the lock.

Usage

From source file:com.netflix.config.ConcurrentMapConfiguration.java

protected void addPropertyDirect(String key, Object value) {
    ReentrantLock lock = locks[Math.abs(key.hashCode()) % NUM_LOCKS];
    lock.lock();
    try {/*from  w w  w. jav a  2s  .  c  om*/
        Object previousValue = map.putIfAbsent(key, value);
        if (previousValue == null) {
            return;
        }
        if (previousValue instanceof List) {
            // the value is added to the existing list
            ((List) previousValue).add(value);
        } else {
            // the previous value is replaced by a list containing the previous value and the new value
            List<Object> list = new CopyOnWriteArrayList<Object>();
            list.add(previousValue);
            list.add(value);
            map.put(key, list);
        }
    } finally {
        lock.unlock();
    }
}

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From source file:net.ymate.platform.cache.support.CacheableProxy.java

public Object doProxy(IProxyChain proxyChain) throws Throwable {
    ICaches _caches = Caches.get(proxyChain.getProxyFactory().getOwner());
    ///*  ww w .ja  va  2s .  c  om*/
    Cacheable _anno = proxyChain.getTargetMethod().getAnnotation(Cacheable.class);
    if (_anno == null) {
        return proxyChain.doProxyChain();
    }
    //
    Object _cacheKey = StringUtils.trimToNull(_anno.key());
    if (_cacheKey == null) {
        _cacheKey = _caches.getModuleCfg().getKeyGenerator().generateKey(proxyChain.getTargetMethod(),
                proxyChain.getMethodParams());
    }
    ReentrantLock _locker = __LOCK_MAP.get(_cacheKey.toString());
    if (_locker == null) {
        _locker = new ReentrantLock();
        ReentrantLock _previous = __LOCK_MAP.putIfAbsent(_cacheKey.toString(), _locker);
        if (_previous != null) {
            _locker = _previous;
        }
    }
    _locker.lock();
    CacheElement _result = null;
    try {
        ICacheScopeProcessor _scopeProc = _caches.getModuleCfg().getCacheScopeProcessor();
        if (!_anno.scope().equals(ICaches.Scope.DEFAULT) && _scopeProc != null) {
            _result = _scopeProc.getFromCache(_caches, _anno.scope(), _anno.cacheName(), _cacheKey.toString());
        } else {
            _result = (CacheElement) _caches.get(_anno.cacheName(), _cacheKey);
        }
        boolean _flag = true;
        if (_result != null && !_result.isExpired()) {
            _flag = false;
        }
        if (_flag) {
            Object _cacheTarget = proxyChain.doProxyChain();
            if (_cacheTarget != null) {
                _result = new CacheElement(_cacheTarget);
                int _timeout = _anno.timeout() > 0 ? _anno.timeout()
                        : _caches.getModuleCfg().getDefaultCacheTimeout();
                if (_timeout > 0) {
                    _result.setTimeout(_timeout);
                }
                if (!_anno.scope().equals(ICaches.Scope.DEFAULT) && _scopeProc != null) {
                    _scopeProc.putInCache(_caches, _anno.scope(), _anno.cacheName(), _cacheKey.toString(),
                            _result);
                } else {
                    _caches.put(_anno.cacheName(), _cacheKey, _result);
                }
            }
        }
    } finally {
        _locker.unlock();
    }
    return _result != null ? _result.getObject() : null;
}

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From source file:org.eclipselabs.etrack.server.web.storage.AbstractStorageResource.java

@Override
protected Representation doConditionalHandle() throws ResourceException {
    ReentrantLock lock = null;

    synchronized (locks) {
        lock = locks.get(getReference().toString());

        if (lock == null) {
            lock = new ReentrantLock();
            locks.put(getReference().toString(), lock);
        }/*ww w  . jav  a  2s  .  c  om*/
    }

    lock.lock();

    try {
        Representation result = super.doConditionalHandle();
        return result;
    } finally {
        lock.unlock();
    }
}

---

From source file:me.xiaopan.android.spear.download.HttpClientImageDownloader.java

@Override
public DownloadResult download(DownloadRequest request) {
    // ?????//from   w w  w  .j a  v a 2 s  .c  o m
    ReentrantLock urlLock = getUrlLock(request.getUri());
    urlLock.lock();

    DownloadResult result = null;
    int number = 0;
    while (true) {
        // ???
        if (request.isCanceled()) {
            if (Spear.isDebugMode())
                Log.w(Spear.LOG_TAG,
                        NAME + "" + "? - ??" + "" + request.getName());
            break;
        }

        // ?
        File cacheFile = request.getCacheFile();
        if (cacheFile != null && cacheFile.exists()) {
            result = DownloadResult.createByFile(cacheFile, false);
            break;
        }

        try {
            result = realDownload(request);
            break;
        } catch (Throwable e) {
            boolean retry = (e instanceof SocketTimeoutException || e instanceof InterruptedIOException)
                    && number < maxRetryCount;
            if (retry) {
                number++;
                if (Spear.isDebugMode())
                    Log.w(Spear.LOG_TAG,
                            NAME + "" + " - ??" + "" + request.getName());
            } else {
                if (Spear.isDebugMode())
                    Log.e(Spear.LOG_TAG,
                            NAME + "" + " - ???" + "" + request.getName());
            }
            e.printStackTrace();
            if (!retry) {
                break;
            }
        }
    }

    // ?
    urlLock.unlock();
    return result;
}

---

From source file:com.wooki.domain.biz.ChapterManagerImpl.java

public void updateContent(Long chapterId, Draft draft) {

    assert chapterId != null;
    assert draft != null;
    assert draft.getData() != null;

    // Update last modified timestamp
    Date lastModified = Calendar.getInstance().getTime();
    ReentrantLock lock = getOrCreateLock(chapterId);

    Publication publication = publicationDao.findLastRevision(chapterId);
    lock.lock();

    Chapter chapter = null;/* www. j  a  va  2 s  .  c  om*/

    try {
        chapter = chapterDao.findById(chapterId);
        if (chapter.getLastModified() != null && !chapter.getLastModified().equals(draft.getTimestamp())) {
            throw new ConcurrentModificationException(
                    "Document has been modified by another user in the meantime.");
        }
        chapter.setLastModified(lastModified);
        chapterDao.update(chapter);
    } finally {
        lock.unlock();
    }

    // we check the published flag. If set, then this Publication must
    // be considered as "locked" and we must create a new publication as
    // the new working copy
    if (publication == null || (publication != null && publication.isPublished())) {
        publication = new Publication();

        // Security check
        if (!securityCtx.isLoggedIn() || !this.securityCtx.canWrite(chapter.getBook())) {
            throw new AuthorizationException("Publish action not authorized");
        }
        publication.setChapter(chapter);

        publication.setCreationDate(Calendar.getInstance().getTime());
        publicationDao.create(publication);
    }

    publication.setContent(draft.getData());
    publication.setLastModified(lastModified);
    publicationDao.update(publication);

}

---

From source file:me.xiaopan.sketch.download.HttpClientImageDownloader.java

@Override
public DownloadResult download(DownloadRequest request) {
    // ?????/*  w  w w. j  a v  a  2  s .  c om*/
    request.setRequestStatus(RequestStatus.GET_DOWNLOAD_LOCK);
    ReentrantLock urlLock = getUrlLock(request.getUri());
    urlLock.lock();

    request.setRequestStatus(RequestStatus.DOWNLOADING);
    DownloadResult result = null;
    int number = 0;
    while (true) {
        // ???
        if (request.isCanceled()) {
            if (Sketch.isDebugMode()) {
                Log.w(Sketch.TAG, SketchUtils.concat(NAME, " - ", "canceled", " - ", "get lock after", " - ",
                        request.getName()));
            }
            break;
        }

        // ?
        if (request.isCacheInDisk()) {
            File cacheFile = request.getSketch().getConfiguration().getDiskCache()
                    .getCacheFile(request.getUri());
            if (cacheFile != null && cacheFile.exists()) {
                result = DownloadResult.createByFile(cacheFile, false);
                break;
            }
        }

        try {
            result = realDownload(request);
            break;
        } catch (Throwable e) {
            boolean retry = (e instanceof SocketTimeoutException || e instanceof InterruptedIOException)
                    && number < maxRetryCount;
            if (retry) {
                number++;
                if (Sketch.isDebugMode()) {
                    Log.w(Sketch.TAG, SketchUtils.concat(NAME, " - ", "download failed", " - ", "retry", " - ",
                            request.getName()));
                }
            } else {
                if (Sketch.isDebugMode()) {
                    Log.e(Sketch.TAG, SketchUtils.concat(NAME, " - ", "download failed", " - ", "end", " - ",
                            request.getName()));
                }
            }
            e.printStackTrace();
            if (!retry) {
                break;
            }
        }
    }

    // ?
    urlLock.unlock();
    return result;
}

---

From source file:org.ut.biolab.medsavant.server.db.LockController.java

/**
 * Obtain a lock. If another thread already owns the lock, an exception will
 * be thrown.//from  w  ww .j  av  a 2 s . c o m
 *
 * @param database The database with the project to be unlocked.
 * @param projectID The project ID to lock
 * @throws LockException
 */
public synchronized void requestLock(String database, int projectID) throws LockException {
    LOG.info("Server lock requested");
    Key key = new Key(database, projectID);
    ReentrantLock lock = locks.get(key);

    // create the lock if one doesn't exist for the project
    if (lock == null) {
        lock = new ReentrantLock();
        locks.put(key, lock);
    }

    // lock it down 
    // (if this thread owns the lock, call lock again which will increase the hold count)
    if (!lock.isLocked() || lock.isHeldByCurrentThread()) {
        lock.lock();
        LOG.info(String.format("Server locked - hold count %d", lock.getHoldCount()));
    } else {
        throw new LockException("Database is locked for changes");
    }
}

---

From source file:org.apache.openejb.util.classloader.URLClassLoaderFirst.java

@Override
public Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {

    final ReentrantLock lock = LOCK;
    lock.lock();

    try {/*ww  w  . j ava  2s.  com*/
        // already loaded?
        Class<?> clazz = findLoadedClass(name);
        if (clazz != null) {
            if (resolve) {
                resolveClass(clazz);
            }
            return clazz;
        }

        // JSE classes?
        if (canBeLoadedFromSystem(name)) {
            try {
                clazz = system.loadClass(name);
                if (clazz != null) {
                    if (resolve) {
                        resolveClass(clazz);
                    }
                    return clazz;
                }
            } catch (final ClassNotFoundException ignored) {
                // no-op
            }
        }

        // look for it in this classloader
        final boolean ok = !(shouldSkip(name) || shouldDelegateToTheContainer(this, name));
        if (ok) {
            clazz = loadInternal(name, resolve);
            if (clazz != null) {
                return clazz;
            }
        }

        // finally delegate
        clazz = loadFromParent(name, resolve);
        if (clazz != null) {
            return clazz;
        }

        if (!ok) {
            clazz = loadInternal(name, resolve);
            if (clazz != null) {
                return clazz;
            }
        }

        throw new ClassNotFoundException(name);
    } finally {
        lock.unlock();
    }
}

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From source file:org.gdg.frisbee.android.cache.ModelCache.java

public CacheItem put(final String url, final Object obj, DateTime expiresAt) {

    if (obj == null)
        return null;

    Log.d(LOG_TAG, String.format("put(%s)", url));
    CacheItem d = new CacheItem(obj, expiresAt);

    if (null != mMemoryCache) {
        mMemoryCache.put(url, d);/*from   www  .j a  va2  s.  c  o m*/
    }

    if (null != mDiskCache) {
        checkNotOnMainThread();

        final String key = transformUrlForDiskCacheKey(url);
        final ReentrantLock lock = getLockForDiskCacheEdit(key);
        lock.lock();
        try {
            DiskLruCache.Editor editor = mDiskCache.edit(key);
            writeValueToDisk(editor.newOutputStream(0), obj);
            writeExpirationToDisk(editor.newOutputStream(1), expiresAt);
            editor.commit();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
            scheduleDiskCacheFlush();
        }
    }

    return d;
}

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From source file:com.streamsets.datacollector.io.DataStore.java

@VisibleForTesting
void acquireLock() {
    LOG.trace("Acquiring lock for '{}'", file);
    ReentrantLock lock = null;
    synchronized (DataStore.class) {
        lock = FILE_LOCKS.get(file);/*  ww  w.  ja  v a2s.com*/
        if (lock == null) {
            lock = new ReentrantLock();
            FILE_LOCKS.put(file, lock);
        } else {
            Utils.checkState(!lock.isHeldByCurrentThread(),
                    Utils.format("The current thread already has a lock on '{}'", file));
        }
    }
    lock.lock();
    LOG.trace("Acquired lock for '{}'", file);
}

---

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