Examples of org.exist.storage.lock.Lock.acquire()

org.exist.storage.lock.Lock.acquire()
Acquire a lock for read. @throws LockException

                }
            }


            final Lock lock = collectionsDb.getLock();
            try {
                lock.acquire(Lock.WRITE_LOCK);
                collectionsCache.remove(collection);
                final Value key = new CollectionStore.CollectionKey(uri.toString());
                collectionsDb.remove(transaction, key);
                //TODO : resolve URIs destination.getURI().resolve(newName)
                collection.setPath(destination.getURI().append(newName));

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                }


                //Update current state
                final Lock lock = collectionsDb.getLock();
                try {
                    lock.acquire(Lock.WRITE_LOCK);
                    // remove the metadata of all documents in the collection
                    final Value docKey = new CollectionStore.DocumentKey(collection.getId());
                    final IndexQuery query = new IndexQuery(IndexQuery.TRUNC_RIGHT, docKey);
                    collectionsDb.removeAll(transaction, query);
                    // if this is not the root collection remove it...

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            pool.getCollectionsCache().add(collection);
        }


        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.WRITE_LOCK);


            if(collection.getId() == Collection.UNKNOWN_COLLECTION_ID) {
                collection.setId(getNextCollectionId(transaction));
            }
            final Value name = new CollectionStore.CollectionKey(collection.getURI().toString());

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        if(nextCollectionId != Collection.UNKNOWN_COLLECTION_ID) {
            return nextCollectionId;
        }
        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.WRITE_LOCK);
            final Value key = new CollectionStore.CollectionKey(CollectionStore.NEXT_COLLECTION_ID_KEY);
            final Value data = collectionsDb.get(key);
            if(data != null) {
                nextCollectionId = ByteConversion.byteToInt(data.getData(), OFFSET_COLLECTION_ID);
                ++nextCollectionId;

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    @Override
    public DocumentImpl getResourceById(final int collectionId, final byte resourceType, final int documentId) throws PermissionDeniedException {
        XmldbURI uri = null;
        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.READ_LOCK);
            //final VariableByteOutputStream os = new VariableByteOutputStream(8);
            //doc.write(os);
            //Value key = new CollectionStore.DocumentKey(doc.getCollection().getId(), doc.getResourceType(), doc.getDocId());
            //collectionsDb.put(transaction, key, os.data(), true);

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    public void storeXMLResource(final Txn transaction, final DocumentImpl doc) {




        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.WRITE_LOCK);
            final VariableByteOutputStream os = new VariableByteOutputStream(8);
            doc.write(os);
            final Value key = new CollectionStore.DocumentKey(doc.getCollection().getId(), doc.getResourceType(), doc.getDocId());
            collectionsDb.put(transaction, key, os.data(), true);
            //} catch (ReadOnlyException e) {

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    //TODO : consider a better cooperation with Collection -pb
    @Override
    public void getCollectionResources(final Collection.InternalAccess collectionInternalAccess) {
        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.READ_LOCK);
            final Value key = new CollectionStore.DocumentKey(collectionInternalAccess.getId());
            final IndexQuery query = new IndexQuery(IndexQuery.TRUNC_RIGHT, key);


            collectionsDb.query(query, new DocumentCallback(collectionInternalAccess));
        } catch(final LockException e) {

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    @Override
    public void getResourcesFailsafe(final BTreeCallback callback, final boolean fullScan) throws TerminatedException {
        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.READ_LOCK);
            final Value key = new CollectionStore.DocumentKey();
            final IndexQuery query = new IndexQuery(IndexQuery.TRUNC_RIGHT, key);
            if(fullScan) {
                collectionsDb.rawScan(query, callback);
            } else {

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    @Override
    public void getCollectionsFailsafe(final BTreeCallback callback) throws TerminatedException {
        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.READ_LOCK);
            final Value key = new CollectionStore.CollectionKey();
            final IndexQuery query = new IndexQuery(IndexQuery.TRUNC_RIGHT, key);
            collectionsDb.query(query, callback);
        } catch(final LockException e) {
            LOG.warn("Failed to acquire lock on " + collectionsDb.getFile().getName());

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    //TODO : consider a better cooperation with Collection -pb
    @Override
    public void getResourceMetadata(final DocumentImpl document) {
        final Lock lock = collectionsDb.getLock();
        try {
            lock.acquire(Lock.READ_LOCK);
            final Value key = new CollectionStore.DocumentKey(document.getCollection().getId(), document.getResourceType(), document.getDocId());
            final VariableByteInput is = collectionsDb.getAsStream(key);
            if(is != null) {
                document.readDocumentMeta(is);
            }

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