/**
* Try to process a single transaction. Up to {@code MAX_ACCEPTABLE_FAIL_COUNT} attempts will be
* made to process the transaction in cases where I/O errors or non-protocol server errors occur
* during processing. Use of the underlying session is protected against concurrent use by other
* threads by using the getSession/releaseSession features of this SessionManager's {@link
* com.ausregistry.jtoolkit2.session.SessionPool}. This method guarantees that the session used
* will be returned to the pool before the method returns.
*
* @throws FatalSessionException No session could be acquired to process the transaction. Check
* the exception message and log records for details.
* @throws IOException Every attempt to execute the transaction command failed due to an
* IOException. This is the last such IOException.
* @throws ParsingException Parsing of the response failed. Check the exception message for the
* cause.
* @throws CommandFailedException The acceptable limit on the number of failed commands due to
* server error was exceeded in trying to process the command. This probably indicates a
* server limitation related to the command being processed.
* @throws IllegalStateException The SessionManager had been shutdown or not started up prior to
* invoking this method.
*/
@Override
public void execute(Transaction tx)
throws FatalSessionException, IOException, ParsingException, CommandFailedException,
IllegalStateException {
debugLogger.finest("enter");
if (state == SMState.STOPPED) {
throw new IllegalStateException();
}
Command cmd = tx.getCommand();
Response response = tx.getResponse();
int failCount = 0;
boolean isExecuted = false;
Session session = null;
// if only processing one transaction, get a new session for each
// attempt in case the session fails mid-transaction.
while (!isExecuted && state != SMState.STOPPED) {
try {
session = sessionPool.getSession(cmd.getCommandType());
StatsManager statsManager = session.getStatsManager();
statsManager.incCommandCounter(cmd.getCommandType());
tx.start();
session.write(cmd);
isExecuted = true;
session.read(response);
tx.setState(TransactionState.PROCESSED);
statsManager.recordResponseTime(cmd.getCommandType(), tx.getResponseTime());
Result[] results = response.getResults();
assert results != null;
if (results != null) {
for (Result result : results) {
assert result != null;
statsManager.incResultCounter(result.getResultCode());
int code = result.getResultCode();
switch (code) {
case ResultCode.CMD_FAILED:
throw new CommandFailedException();
case ResultCode.CMD_FAILED_CLOSING:
default:
throw new CommandFailedException();
}
}
}
} catch (CommandFailedException cfe) {
userLogger.warning(cfe.getMessage());
if (state != SMState.STOPPED && failCount < MAX_ACCEPTABLE_FAIL_COUNT) {
failCount++;
} else {
throw cfe;
}
} catch (IOException ioe) {
userLogger.warning(ioe.getMessage());
userLogger.warning("net.socket.closed");
session.close();
if (state != SMState.STOPPED && failCount < MAX_ACCEPTABLE_FAIL_COUNT) {
failCount++;
} else {
throw ioe;
}
} catch (InterruptedException ie) {
// if interrupted by shutdown, then started will be false
// Note: this still enters the finally block
continue;
} catch (SessionConfigurationException sce) {
throw new FatalSessionException(sce);
} catch (SessionOpenException soe) {
throw new FatalSessionException(soe);
} finally {
sessionPool.releaseSession(session);
}
}
if (!isExecuted && state == SMState.STOPPED) {
throw new IllegalStateException();
}
debugLogger.finest("exit");
}