private void driveClientIO() throws IOException, GearmanException {
for (GearmanJobServerSession sess : sessionsMap.values()) {
int interestOps = SelectionKey.OP_READ;
if (sess.sessionHasDataToWrite()) {
interestOps |= SelectionKey.OP_WRITE;
}
try {
sess.getSelectionKey().interestOps(interestOps);
} catch (IllegalStateException ise) {
LOG.warn("Unable to drive IO for session " + sess + "," + " skipping.", ise);
continue;
}
}
ioAvailable.selectNow();
Set<SelectionKey> keys = ioAvailable.selectedKeys();
LOG.trace(
"Driving IO for client "
+ this
+ ". "
+ keys.size()
+ " session(s) currently available for IO");
Iterator<SelectionKey> iter = keys.iterator();
while (iter.hasNext()) {
SelectionKey key = iter.next();
GearmanJobServerSession s = sessionsMap.get(key);
s.driveSessionIO();
}
}
public void work() {
if (!state.equals(State.IDLE)) {
throw new IllegalStateException(
"Can not call work while worker " + "is running or shutting down");
}
state = State.RUNNING;
// a map keeping track of sessions with connection errors
// (to avoid printing an error about them in every reconnect attempt)
Map<GearmanJobServerSession, Boolean> havingConnectionError =
new HashMap<GearmanJobServerSession, Boolean>();
while (isRunning()) {
// look for sessions which have been disconnected and attempt to reconnect.
for (Iterator<GearmanJobServerSession> iter = sessionMap.values().iterator();
iter.hasNext(); ) {
GearmanJobServerSession sess = iter.next();
if (!sess.isInitialized()) {
try {
// reconnect, unregister old selection key and register new one
SelectionKey oldKey = sess.isInitialized() ? sess.getSelectionKey() : null;
sess.initSession(ioAvailable, this);
if (oldKey != null) {
iter.remove();
}
sessionMap.put(sess.getSelectionKey(), sess);
// register all functions with the newly reconnected server
for (FunctionDefinition d : functionMap.values()) {
GearmanTask gsr = new GearmanTask(null, generateCanDoPacket(d));
sess.submitTask(gsr);
}
GearmanPacket p =
new GearmanPacketImpl(
GearmanPacketMagic.REQ,
GearmanPacketType.SET_CLIENT_ID,
ByteUtils.toUTF8Bytes(id));
sess.submitTask(new GearmanTask(p));
GearmanTask sessTask =
new GearmanTask(
new GrabJobEventHandler(sess),
new GearmanPacketImpl(
GearmanPacketMagic.REQ, getGrabJobPacketType(), new byte[0]));
sess.submitTask(sessTask);
sess.driveSessionIO();
// log reconnection message
if (havingConnectionError.get(sess)) {
LOG.info("Re-established connection to " + sess.getConnection().toString());
}
havingConnectionError.put(sess, false);
} catch (IOException e) {
if (!havingConnectionError.get(sess)) {
LOG.warn("Error connecting to " + sess + ", will keep trying..");
}
havingConnectionError.put(sess, true);
try {
Thread.sleep(50);
} catch (InterruptedException e1) {
}
}
} else {
havingConnectionError.put(sess, false);
}
}
for (GearmanJobServerSession sess : sessionMap.values()) {
// if still disconnected, skip
if (!sess.isInitialized()) {
continue;
}
int interestOps = SelectionKey.OP_READ;
if (sess.sessionHasDataToWrite()) {
interestOps |= SelectionKey.OP_WRITE;
}
sess.getSelectionKey().interestOps(interestOps);
}
try {
ioAvailable.select(1);
} catch (IOException io) {
LOG.warn("Receieved IOException while" + " selecting for IO", io);
}
for (SelectionKey key : ioAvailable.selectedKeys()) {
GearmanJobServerSession sess = sessionMap.get(key);
if (sess == null) {
LOG.warn("Worker does not have " + "session for key " + key);
continue;
}
if (!sess.isInitialized()) {
continue;
}
try {
GearmanTask sessTask = taskMap.get(sess);
if (sessTask == null) {
sessTask =
new GearmanTask( // NOPMD
new GrabJobEventHandler(sess),
new GearmanPacketImpl(
GearmanPacketMagic.REQ, getGrabJobPacketType(), new byte[0]));
taskMap.put(sess, sessTask);
sess.submitTask(sessTask);
LOG.debug(
"Worker: "
+ this
+ " submitted a "
+ sessTask.getRequestPacket().getPacketType()
+ " to session: "
+ sess);
}
sess.driveSessionIO();
// For the time being we will execute the jobs synchronously
// in the future, I expect to change this.
if (!functionList.isEmpty()) {
GearmanFunction fun = functionList.remove();
submitFunction(fun);
statistics();
}
} catch (IOException ioe) {
LOG.warn("Received IOException while driving" + " IO on session " + sess, ioe);
sess.closeSession();
continue;
}
}
}
shutDownWorker(true);
}