public boolean set(int sequence, String message) throws IOException {
Connection connection = null;
PreparedStatement insert = null;
ResultSet rs = null;
try {
connection = dataSource.getConnection();
insert = connection.prepareStatement(SQL_INSERT_MESSAGE);
int offset = setSessionIdParameters(insert, 1);
insert.setInt(offset++, sequence);
insert.setString(offset, message);
insert.execute();
} catch (SQLException ex) {
if (connection != null) {
PreparedStatement update = null;
try {
update = connection.prepareStatement(SQL_UPDATE_MESSAGE);
update.setString(1, message);
int offset = setSessionIdParameters(update, 2);
update.setInt(offset, sequence);
boolean status = update.execute();
return !status ? update.getUpdateCount() > 0 : false;
} catch (SQLException e) {
throw (IOException) new IOException(e.getMessage()).initCause(e);
} finally {
JdbcUtil.close(sessionID, update);
}
}
} finally {
JdbcUtil.close(sessionID, rs);
JdbcUtil.close(sessionID, insert);
JdbcUtil.close(sessionID, connection);
}
return true;
}
private void storeSequenceNumbers() throws IOException {
Connection connection = null;
PreparedStatement update = null;
try {
connection = dataSource.getConnection();
update = connection.prepareStatement(SQL_UPDATE_SEQNUMS);
update.setInt(1, cache.getNextTargetMsgSeqNum());
update.setInt(2, cache.getNextSenderMsgSeqNum());
setSessionIdParameters(update, 3);
update.execute();
} catch (SQLException e) {
throw (IOException) new IOException(e.getMessage()).initCause(e);
} finally {
JdbcUtil.close(sessionID, update);
JdbcUtil.close(sessionID, connection);
}
}
private void loadCache() throws SQLException, IOException {
Connection connection = null;
PreparedStatement query = null;
PreparedStatement insert = null;
ResultSet rs = null;
try {
connection = dataSource.getConnection();
query = connection.prepareStatement(SQL_GET_SEQNUMS);
setSessionIdParameters(query, 1);
rs = query.executeQuery();
if (rs.next()) {
cache.setCreationTime(SystemTime.getUtcCalendar(rs.getTimestamp(1)));
cache.setNextTargetMsgSeqNum(rs.getInt(2));
cache.setNextSenderMsgSeqNum(rs.getInt(3));
} else {
insert = connection.prepareStatement(SQL_INSERT_SESSION);
int offset = setSessionIdParameters(insert, 1);
insert.setTimestamp(offset++, new Timestamp(cache.getCreationTime().getTime()));
insert.setInt(offset++, cache.getNextTargetMsgSeqNum());
insert.setInt(offset, cache.getNextSenderMsgSeqNum());
insert.execute();
}
} finally {
JdbcUtil.close(sessionID, rs);
JdbcUtil.close(sessionID, query);
JdbcUtil.close(sessionID, insert);
JdbcUtil.close(sessionID, connection);
}
}
public void reset() throws IOException {
cache.reset();
Connection connection = null;
PreparedStatement deleteMessages = null;
PreparedStatement updateTime = null;
try {
connection = dataSource.getConnection();
deleteMessages = connection.prepareStatement(SQL_DELETE_MESSAGES);
setSessionIdParameters(deleteMessages, 1);
deleteMessages.execute();
updateTime = connection.prepareStatement(SQL_UPDATE_SESSION);
updateTime.setTimestamp(
1, new Timestamp(Calendar.getInstance(TimeZone.getTimeZone("UTC")).getTimeInMillis()));
updateTime.setInt(2, getNextTargetMsgSeqNum());
updateTime.setInt(3, getNextSenderMsgSeqNum());
setSessionIdParameters(updateTime, 4);
updateTime.execute();
} catch (SQLException e) {
throw (IOException) new IOException(e.getMessage()).initCause(e);
} catch (IOException e) {
throw e;
} finally {
JdbcUtil.close(sessionID, deleteMessages);
JdbcUtil.close(sessionID, updateTime);
JdbcUtil.close(sessionID, connection);
}
}
public void get(int startSequence, int endSequence, Collection<String> messages)
throws IOException {
Connection connection = null;
PreparedStatement query = null;
ResultSet rs = null;
try {
connection = dataSource.getConnection();
query = connection.prepareStatement(SQL_GET_MESSAGES);
int offset = setSessionIdParameters(query, 1);
query.setInt(offset++, startSequence);
query.setInt(offset, endSequence);
rs = query.executeQuery();
while (rs.next()) {
String message = rs.getString(1);
messages.add(message);
}
} catch (SQLException e) {
throw (IOException) new IOException(e.getMessage()).initCause(e);
} finally {
JdbcUtil.close(sessionID, rs);
JdbcUtil.close(sessionID, query);
JdbcUtil.close(sessionID, connection);
}
}