Examples of org.exist.storage.dom.DOMFile

org.exist.storage.dom.DOMFile
This is the main storage for XML nodes. Nodes are stored in document order. Every document gets its own sequence of pages, which is bound to the writing thread to avoid conflicting writes. The page structure is as follows: | page header | (tid1 node-data, tid2 node-data, ..., tidn node-data) | node-data contains the raw binary data of the node. Within a page, a node is identified by a unique id, called tuple id (tuple id). Every node can thus be located by a virtual address pointer, which consists of the page id and the tid. Both components are encoded in a long value (with additional bits used for optional flags). The address pointer is used to reference nodes from the indexes. It should thus remain unchanged during the life-time of a document. However, XUpdate requests may insert new nodes in the middle of a page. In these cases, the page will be split and the upper portion of the page is copied to a split page. The record in the original page will be replaced by a forward link, pointing to the new location of the node data in the split page. As a consequence, the class has to distinguish three different types of data records: 1) Ordinary record: | tuple id | length | data | 3) Relocated record: | tuple id | length | address pointer to original location | data | 2) Forward link: | tuple id | address pointer | tuple id and length each use two bytes (short), address pointers 8 bytes (long). The upper two bits of the tuple id are used to indicate the type of the record (see {@link org.exist.storage.dom.ItemId}). @author Wolfgang Meier

            //3) have consistent file creation behaviour (we can probably avoid some unnecessary files)
            //4) use... *customized* factories for a better index extensibility ;-)
            // Initialize DOM storage
            domDb = (DOMFile) config.getProperty(DOMFile.getConfigKeyForFile());
            if(domDb == null) {
                domDb = new DOMFile(pool, DOM_DBX_ID, dataDir, config);
            }
            if(domDb.isReadOnly()) {
                LOG.warn(domDb.getFile().getName() + " is read-only!");
                pool.setReadOnly();
            }

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        this.contentHandler.startElement(NAMESPACE, "buffers", PREFIX + ":buffers", atts);
        final Configuration conf = instance.getConfiguration();
        BFile db;
        db = (BFile) conf.getProperty(CollectionStore.FILE_KEY_IN_CONFIG);
        genBufferDetails(db.getIndexBufferStats(), db.getDataBufferStats(), "Collections storage ("+ db.getFile().getName() + ")");
        final DOMFile dom = (DOMFile) conf.getProperty(DOMFile.CONFIG_KEY_FOR_FILE);
        genBufferDetails(dom.getIndexBufferStats(), dom.getDataBufferStats(), "Resource storage ("+ dom.getFile().getName() + ")");
        db = (BFile) conf.getProperty(NativeValueIndex.FILE_KEY_IN_CONFIG);
        if (db != null)
            {genBufferDetails(db.getIndexBufferStats(), db.getDataBufferStats(), "Values index ("+ db.getFile().getName() + ")");}
        db = (BFile) conf.getProperty(NativeTextEngine.FILE_KEY_IN_CONFIG);
        if (db != null)

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    /** generate index statistics
     * @param conf
     * @param indexStats
     */
    public static void generateIndexStatistics(Configuration conf, Map<String, IndexStats> indexStats) {
        final DOMFile dom = (DOMFile) conf.getProperty(DOMFile.CONFIG_KEY_FOR_FILE);
        if(dom != null)
            {indexStats.put(DOMFile.FILE_NAME, new IndexStats(dom));}
        BFile db = (BFile) conf.getProperty(CollectionStore.FILE_KEY_IN_CONFIG);
        if(db != null)
            {indexStats.put(CollectionStore.FILE_NAME, new IndexStats(db));}

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