@Override
public Collection<Integer> getCurrentIds() throws Exception {
List<Integer> ids = new ArrayList<>();
if (fileFactory != null) {
for (String fileName : fileFactory.listFiles("page")) {
ids.add(getPageIdFromFileName(fileName));
}
}
return ids;
}
@Override
public void start() throws Exception {
lock.writeLock().lock();
try {
if (running) {
// don't throw an exception.
// You could have two threads adding PagingStore to a
// ConcurrentHashMap,
// and having both threads calling init. One of the calls should just
// need to be ignored
return;
} else {
running = true;
firstPageId = Integer.MAX_VALUE;
// There are no files yet on this Storage. We will just return it empty
if (fileFactory != null) {
currentPageId = 0;
if (currentPage != null) {
currentPage.close();
}
currentPage = null;
List<String> files = fileFactory.listFiles("page");
numberOfPages = files.size();
for (String fileName : files) {
final int fileId = PagingStoreImpl.getPageIdFromFileName(fileName);
if (fileId > currentPageId) {
currentPageId = fileId;
}
if (fileId < firstPageId) {
firstPageId = fileId;
}
}
if (currentPageId != 0) {
currentPage = createPage(currentPageId);
currentPage.open();
List<PagedMessage> messages = currentPage.read(storageManager);
LivePageCache pageCache = new LivePageCacheImpl(currentPage);
for (PagedMessage msg : messages) {
pageCache.addLiveMessage(msg);
if (msg.getMessage().isLargeMessage()) {
// We have to do this since addLIveMessage will increment an extra one
((LargeServerMessage) msg.getMessage()).decrementDelayDeletionCount();
}
}
currentPage.setLiveCache(pageCache);
currentPageSize.set(currentPage.getSize());
cursorProvider.addPageCache(pageCache);
}
// We will not mark it for paging if there's only a single empty file
if (currentPage != null && !(numberOfPages == 1 && currentPage.getSize() == 0)) {
startPaging();
}
}
}
} finally {
lock.writeLock().unlock();
}
}