/**
* Operates in a loop, accepting new connections and ensuring that requests on those connections
* are handled properly.
*/
@Override
public void run() {
setName(handlerName);
boolean listening = false;
boolean starting = true;
while (!shutdownRequested) {
// If this connection handler is not enabled, then just sleep
// for a bit and check again.
if (!enabled) {
if (listening) {
cleanUpSelector();
listening = false;
logger.info(NOTE_CONNHANDLER_STOPPED_LISTENING, handlerName);
}
if (starting) {
// This may happen if there was an initialisation error
// which led to disable the connector.
// The main thread is waiting for the connector to listen
// on its port, which will not occur yet,
// so notify here to allow the server startup to complete.
synchronized (waitListen) {
starting = false;
waitListen.notify();
}
}
StaticUtils.sleep(1000);
continue;
}
// If we have gotten here, then we are about to start listening
// for the first time since startup or since we were previously
// disabled. Make sure to start with a clean selector and then
// create all the listeners.
try {
cleanUpSelector();
int numRegistered = registerChannels();
// At this point, the connection Handler either started
// correctly or failed to start but the start process
// should be notified and resume its work in any cases.
synchronized (waitListen) {
waitListen.notify();
}
// If none of the listeners were created successfully, then
// consider the connection handler disabled and require
// administrative action before trying again.
if (numRegistered == 0) {
logger.error(ERR_LDAP_CONNHANDLER_NO_ACCEPTORS, currentConfig.dn());
enabled = false;
continue;
}
listening = true;
// Enter a loop, waiting for new connections to arrive and
// then accepting them as they come in.
boolean lastIterationFailed = false;
while (enabled && !shutdownRequested) {
try {
serveIncomingConnections();
lastIterationFailed = false;
} catch (Exception e) {
logger.traceException(e);
logger.error(
ERR_CONNHANDLER_CANNOT_ACCEPT_CONNECTION,
friendlyName,
currentConfig.dn(),
getExceptionMessage(e));
if (lastIterationFailed) {
// The last time through the accept loop we also
// encountered a failure. Rather than enter a potential
// infinite loop of failures, disable this acceptor and
// log an error.
LocalizableMessage message =
ERR_CONNHANDLER_CONSECUTIVE_ACCEPT_FAILURES.get(
friendlyName, currentConfig.dn(), stackTraceToSingleLineString(e));
logger.error(message);
DirectoryServer.sendAlertNotification(
this, ALERT_TYPE_LDAP_CONNECTION_HANDLER_CONSECUTIVE_FAILURES, message);
cleanUpSelector();
enabled = false;
} else {
lastIterationFailed = true;
}
}
}
if (shutdownRequested) {
cleanUpSelector();
selector.close();
listening = false;
enabled = false;
}
} catch (Exception e) {
logger.traceException(e);
// This is very bad because we failed outside the loop. The
// only thing we can do here is log a message, send an alert,
// and disable the selector until an administrator can figure
// out what's going on.
LocalizableMessage message =
ERR_LDAP_CONNHANDLER_UNCAUGHT_ERROR.get(
currentConfig.dn(), stackTraceToSingleLineString(e));
logger.error(message);
DirectoryServer.sendAlertNotification(
this, ALERT_TYPE_LDAP_CONNECTION_HANDLER_UNCAUGHT_ERROR, message);
cleanUpSelector();
enabled = false;
}
}
}
