@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
DistributedTable table = getTable(req, resp);
if (table == null) {
return;
}
int diff;
try {
table.useTransaction(sessionID);
diff = table.rollback();
table.removeTransaction(sessionID);
} catch (IllegalStateException e) {
resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
return;
} finally {
manager.deleteTableByID(sessionID);
}
resp.setStatus(HttpServletResponse.SC_OK);
resp.setContentType("text/plain");
resp.setCharacterEncoding("UTF8");
resp.getWriter().println("diff=" + diff);
}
public DistributedTable(File tableDirectory, String name) throws IOException {
currentPath = new File(tableDirectory.getPath() + File.separator + name);
tableName = name;
if (!currentPath.exists()) {
if (!currentPath.mkdir()) {
throw new IOException(currentPath.getAbsolutePath() + ": couldn't create directory");
}
}
for (int i = 0; i < partsNumber; i++) {
directoriesList[i] = new File(currentPath.getPath() + File.separator + i + ".dir");
for (int j = 0; j < partsNumber; j++) {
filesList[i][j] = new File(directoriesList[i].getPath() + File.separator + j + ".dat");
}
}
oldRecordNumber = readTable();
cache = new HashMap<>();
changes = new HashMap<>();
rollback();
}