public void run() {
while (!requestShutdown) {
try {
logger.debug(Messages.getString("queryScheduler.running"));
synchronized (this) {
while (queue.size() != 0) executeNextInQueue();
logger.debug(Messages.getString("queryScheduler.waitingForMore"));
wait();
}
} catch (Exception e) {
logger.error(e);
e.printStackTrace();
}
}
}
public ResultSet executeQuery(AbstractQueryManager s) throws RemoteException, SQLException {
// Isto e thread-safe?
put(s);
ResultSet rs = null;
try {
rs = ((SelectQueryManager) s).executeQuery();
logger.debug(Messages.getString("queryScheduler.queryExecuted", s.getQueryNumber()));
} catch (SQLException e) {
logger.error(
Messages.getString(
"queryScheduler.queryError", new Object[] {s.getQueryNumber(), e.getMessage()}));
remove(s);
throw e;
}
remove(s);
return rs;
}
public int executeUpdate(AbstractQueryManager s) throws RemoteException, SQLException {
// Isto e thread-safe?
put(s);
int count = -1;
try {
count = ((UpdateQueryManager) s).executeUpdate();
logger.debug(Messages.getString("queryScheduler.queryExecuted", s.getQueryNumber()));
} catch (SQLException e) {
logger.error(
Messages.getString(
"queryScheduler.queryError", new Object[] {s.getQueryNumber(), e.getMessage()}));
remove(s);
throw e;
}
remove(s);
return count;
}
public synchronized void remove(AbstractQueryManager s) {
executingQueries.remove(s);
if (s.getClass().equals(UpdateQueryManager.class)) {
connectionManager.invalidMetaData();
executingUpdate.set(false);
}
logger.debug(Messages.getString("queryScheduler.remove", s.getQueryNumber()));
notifyAll();
}
public void put(AbstractQueryManager s) {
s.setScheduller(this);
longTransactionQueue.wait(s);
synchronized (this) {
queue.add(s);
logger.debug(Messages.getString("queryScheduler.added", s.getQueryNumber()));
notifyAll();
}
}
private void executeNextInQueue() throws Exception {
AbstractQueryManager s;
// Update isolation
while (executingUpdate.get()) {
logger.debug(Messages.getString("queryScheduler.waitingForUpdateEnd"));
wait();
}
while ((((AbstractQueryManager) queue.peek()).getClass().equals(UpdateQueryManager.class))
&& (pendingQueries() > 0)) {
logger.debug(Messages.getString("queryScheduler.waitingForPending"));
wait();
}
s = (AbstractQueryManager) queue.poll();
executingQueries.add(s);
if (s.getClass().equals(UpdateQueryManager.class)) executingUpdate.set(true);
logger.debug(Messages.getString("queryScheduler.dispatching", s.getQueryNumber()));
s.go();
}