Examples of org.chaidb.db.index.btree.bufmgr.PageBufferManager

Package org.chaidb.db.index.btree.bufmgr

Examples of org.chaidb.db.index.btree.bufmgr.PageBufferManager

org.chaidb.db.index.btree.bufmgr.PageBufferManager
This class manages a buffer to cache certain amount of pages. It keeps a buffered page pool using byte[][], a hashtable matches pageNumber to page information, a look aside link list keeps all the pages not accessed by any thread at the moment.
If a thread trying to fetch a page, it gets the page info from the hashtable first.
If the page info indicated the page is a fixed page, which means it is accessed by some thread at the moment, the page is directly returned.
If the page is in a look aside link list, the page is removed from there, and becomes fixed page, and return.
If the page is not found, read it from pagedFile, put as fixed.
If there is no slot in the buffer for a new page, the first node (header) in the look aside link list is kicked off. If it is dirty, will do a write through.

After finishing reading / writing, insert the page to the end of look aside link list.
@version 1.0

    protected boolean doRedo(byte[] page) throws ChaiDBException {
        /* redo allocate a new page function */
        /* free the allocated page function */
        try {
            /* add page to freelist of BufferedPage in memory*/
            PageBufferManager bp = bpm;
            bp.addToFreeList(treeId, super.getPageNum(), new Integer(super.getTxnId()));


            return true;
        } catch (Exception e) {
            logger.debug(e);
            throw new ChaiDBException(ErrorCode.LOG_REDO_FAILED, e.toString());

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            //            synchronized (BufferedPage.getInstance()) {
            //flush log buffer to disk.
            txnManager.getLogManager().flush();


            //Flush btree buffer to disk.
            PageBufferManager bpm = PageBufferManager.getInstance();
            bpm.dump(sync);


            //because dump() may generate new log records, so that
            //flush log again.
            txnManager.getLogManager().flush();

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org.chaidb.db.helper.AbstractDaemonThread

org.chaidb.db.helper.cache.storage.BTreePathStorage

org.chaidb.db.index.btree.BTreeNode

org.chaidb.db.index.btree.hbt.HyperBTreeBasicIterator

org.chaidb.db.index.btree.hbt.HyperBTreeCachedIterator

org.chaidb.db.index.btree.hbt.HyperBTreeIterator

org.chaidb.db.index.IDBIndex

org.chaidb.db.log.logrecord.BTreeFreeOverflowPageLogRecord

org.chaidb.db.log.logrecord.BTreeFreePageLogRecord

org.chaidb.db.log.logrecord.BTreeFreePageWithDataLogRecord

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