Examples of xbird.storage.DbException

xbird.storage.DbException

@author Makoto YUI (yuin405+xbird@gmail.com)

        ensureResourceOpen();
        if(exists()) {
            try {
                _fileHeader.read();
            } catch (IOException e) {
                throw new DbException(e);
            }
            this._opened = true;
            return true;
        } else {
            this._opened = false;

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    protected final RandomAccessFile ensureResourceOpen() throws DbException {
        if(_raf == null) {
            try {
                this._raf = new RandomAccessFile(_file, "rw");
            } catch (FileNotFoundException e) {
                throw new DbException(e);
            }
        }
        if(_fc == null) {
            this._fc = _raf.getChannel();
        }

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            // close resources
            try {
                _raf.close();
                _fc.close();
            } catch (IOException e) {
                throw new DbException(e);
            }
            reset();
            return true;
        } else {
            return false;

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        }
    }


    protected final void checkOpened() throws DbException {
        if(!_opened) {
            throw new DbException("Not opened");
        }
    }

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            if(_fileHeader._fhDirty) {
                _fileHeader.write();
            }
            _fc.force(true);
        } catch (IOException e) {
            throw new DbException(e);
        }
    }

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            // if still not found we need to create it and add it to the page cache.
            p = new Page(pageNum);
            try {
                p.read(); // Load the page from disk if necessary
            } catch (IOException e) {
                throw new DbException(e);
            }
            _pages.put(pageNum, new WeakReference<Page>(p));
        }
        return p;
    }

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        PageHeader hdr = page.getPageHeader();
        hdr.setRecordLength(value.getLength());
        try {
            page.readData(is);
        } catch (IOException e) {
            throw new DbException(e);
        }


        // Write out the rest of the value onto any needed overflow pages
        Page lastPage = page;
        while(true) {
            final int available;
            try {
                available = is.available();
            } catch (IOException e) {
                throw new DbException(e);
            }
            if(available == 0) {
                break;
            }
            LOG.debug("page overflowed");


            Page lpage = lastPage;
            PageHeader lhdr = hdr;


            // Find an overflow page to use
            long np = lhdr.getNextPage();
            if(np != NO_PAGE) {
                // Use an existing page
                lastPage = getPage(np);
            } else {
                // Create a new overflow page
                lastPage = getFreePage();
                lhdr.setNextPage(lastPage.getPageNum());
            }


            // Mark the page as an overflow page
            hdr = lastPage.getPageHeader();
            hdr.setStatus(OVERFLOW);


            // Write some more of the value to the overflow page
            try {
                lastPage.readData(is);
            } catch (IOException e) {
                throw new DbException(e);
            }
            lpage.write();
        }


        // Cleanup any unused overflow pages. i.e. the value is smaller then the

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        while(true) {
            // Add the contents of the page onto the stream
            try {
                p.writeData(bos);
            } catch (IOException e) {
                throw new DbException(e);
            }
            // Continue following the list of pages until we get to the end
            PageHeader ph = p.getPageHeader();
            long nextPage = ph.getNextPage();
            if(nextPage == NO_PAGE) {

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            _pageHeader.write(_pageData);
            try {
                _raf.seek(_pageOffset);
                _raf.write(_pageData.array());
            } catch (IOException e) {
                throw new DbException(e);
            }
        }

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            Page p = getPage(pageNum);
            dataPage = new DataPage(p);
            try {
                dataPage.read();
            } catch (IOException e) {
                throw new DbException("failed to read page#" + pageNum, e);
            }
            dataCache.put(pageNum, dataPage);
        }
        return dataPage;
    }

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