private boolean isValid(final Connection connection) {
if (connection == null) {
return false;
}
if (status != PwmService.STATUS.OPEN) {
return false;
}
try {
final Method getFreeSpaceMethod = File.class.getMethod("isValid");
final Object rawResult = getFreeSpaceMethod.invoke(connection, 10);
return (Boolean) rawResult;
} catch (NoSuchMethodException e) {
/* no error, pre java 1.6 doesn't have this method */
} catch (Exception e) {
LOGGER.debug(
"error checking for isValid for " + connection.toString() + ",: " + e.getMessage());
}
final StringBuilder sb = new StringBuilder();
sb.append("SELECT * FROM ")
.append(DatabaseTable.PWM_META.toString())
.append(" WHERE " + KEY_COLUMN + " = ?");
PreparedStatement statement = null;
ResultSet resultSet = null;
try {
statement = connection.prepareStatement(sb.toString());
statement.setString(1, KEY_ENGINE_START_PREFIX + instanceID);
statement.setMaxRows(1);
resultSet = statement.executeQuery();
if (resultSet.next()) {
resultSet.getString(VALUE_COLUMN);
}
} catch (SQLException e) {
final ErrorInformation errorInformation =
new ErrorInformation(
PwmError.ERROR_DB_UNAVAILABLE, "isValid operation failed: " + e.getMessage());
lastError = errorInformation;
LOGGER.error(errorInformation.toDebugStr());
return false;
} finally {
close(statement);
close(resultSet);
}
return true;
}
@Override
public String get(final DatabaseTable table, final String key) throws DatabaseException {
if (traceLogging) {
LOGGER.trace("attempting get operation for table=" + table + ", key=" + key);
}
preOperationCheck();
final StringBuilder sb = new StringBuilder();
sb.append("SELECT * FROM ").append(table.toString()).append(" WHERE " + KEY_COLUMN + " = ?");
PreparedStatement statement = null;
ResultSet resultSet = null;
String returnValue = null;
try {
statement = connection.prepareStatement(sb.toString());
statement.setString(1, key);
statement.setMaxRows(1);
resultSet = statement.executeQuery();
if (resultSet.next()) {
returnValue = resultSet.getString(VALUE_COLUMN);
}
} catch (SQLException e) {
final ErrorInformation errorInformation =
new ErrorInformation(
PwmError.ERROR_DB_UNAVAILABLE, "get operation failed: " + e.getMessage());
lastError = errorInformation;
throw new DatabaseException(errorInformation);
} finally {
close(statement);
close(resultSet);
}
if (traceLogging) {
final LinkedHashMap<String, Object> debugOutput = new LinkedHashMap<>();
debugOutput.put("table", table);
debugOutput.put("key", key);
debugOutput.put("result", returnValue);
LOGGER.trace(
"get operation result: " + JsonUtil.serializeMap(debugOutput, JsonUtil.Flag.PrettyPrint));
}
updateStats(true, false);
return returnValue;
}