public void removeJobServer(GearmanJobServerConnection conn)
throws IllegalArgumentException, IllegalStateException {
if (!runState.equals(state.RUNNING)) {
throw new IllegalStateException(
"JobServers can not be removed " + "once shutdown has been commenced.");
}
// TODO, make this better
Iterator<GearmanJobServerSession> iter = sessionsMap.values().iterator();
GearmanJobServerSession session = null;
boolean foundit = false;
while (iter.hasNext() && !foundit) {
session = iter.next();
if (session.getConnection().equals(conn)) {
foundit = true;
}
}
if (!foundit) {
throw new IllegalArgumentException(
"JobServer " + conn + " has not" + " been registered with this client.");
}
shutDownSession(session);
LOG.info("Removed job server " + conn + " from client " + this);
}
public boolean addServer(GearmanJobServerConnection conn)
throws IllegalArgumentException, IllegalStateException {
if (conn == null) {
throw new IllegalArgumentException("Connection can not be null");
}
// this is a sub-optimal way to look for dups, but addJobServer
// ops should be infrequent enough that this should be a big penalty
for (GearmanJobServerSession sess : sessionMap.values()) {
if (sess.getConnection().equals(conn)) {
return true;
}
}
GearmanJobServerSession session = new GearmanJobServerSession(conn);
if (ioAvailable == null) {
try {
ioAvailable = Selector.open();
} catch (IOException ioe) {
LOG.warn("Failed to connect to job server " + conn + ".", ioe);
return false;
}
}
try {
session.initSession(ioAvailable, this);
} catch (IOException ioe) {
LOG.warn("Failed to initialize session with job server " + conn + ".", ioe);
return false;
}
SelectionKey key = session.getSelectionKey();
if (key == null) {
String msg =
"Session "
+ session
+ " has a null "
+ "selection key. Server will not be added to worker.";
LOG.warn(msg);
throw new IllegalStateException(msg);
}
sessionMap.put(key, session);
GearmanPacket p =
new GearmanPacketImpl(
GearmanPacketMagic.REQ, GearmanPacketType.SET_CLIENT_ID, ByteUtils.toUTF8Bytes(id));
session.submitTask(new GearmanTask(p));
for (FunctionDefinition def : functionMap.values()) {
p = generateCanDoPacket(def);
session.submitTask(new GearmanTask(p)); // NOPMD
}
p = new GearmanPacketImpl(GearmanPacketMagic.REQ, getGrabJobPacketType(), new byte[0]);
GearmanTask gsr = new GearmanTask(new GrabJobEventHandler(session), p);
taskMap.put(session, gsr);
session.submitTask(gsr);
LOG.debug("Added server " + conn + " to worker " + this);
return true;
}
public boolean hasConnection(GearmanJobServerConnection conn) {
for (GearmanJobServerSession sess : sessionsMap.values()) {
if (sess.getConnection().equals(conn)) {
return true;
}
}
return false;
}
public boolean hasServer(GearmanJobServerConnection conn) {
boolean foundIt = false;
for (GearmanJobServerSession sess : sessionMap.values()) {
if (sess.getConnection().equals(conn)) {
foundIt = true;
}
}
return foundIt;
}
public List<GearmanJobServerConnection> getSetOfJobServers() throws IllegalStateException {
if (!runState.equals(state.RUNNING)) {
throw new IllegalStateException(CLIENT_NOT_ACTIVE);
}
ArrayList<GearmanJobServerConnection> retSet = new ArrayList<GearmanJobServerConnection>();
for (GearmanJobServerSession sess : sessionsMap.values()) {
retSet.add(sess.getConnection());
}
return retSet;
}
private boolean setForwardExceptions(GearmanJobServerSession session) {
GearmanServerResponseHandler optionReqHandler =
new GearmanServerResponseHandler() {
boolean isDone = false;
public boolean isDone() {
return isDone;
}
public void handleEvent(GearmanPacket event) throws GearmanException {
GearmanPacketType type = event.getPacketType();
if (type.equals(GearmanPacketType.OPTION_RES)
&& Arrays.equals(EXCEPTIONS, event.getData())) {
isDone = true;
}
}
};
GearmanTask setExceptionsTask =
new GearmanTask(
optionReqHandler,
new GearmanPacketImpl(
GearmanPacketMagic.REQ, GearmanPacketType.OPTION_REQ, EXCEPTIONS));
session.submitTask(setExceptionsTask);
Exception e = null;
boolean success = false;
try {
success = driveRequestTillState(setExceptionsTask, GearmanTask.State.FINISHED);
} catch (IOException ioe) {
e = ioe;
}
if (!success) {
if (e != null) {
LOG.info("Failed to set forward-exceptions option to " + session.getConnection(), e);
} else {
LOG.info("Failed to set forward-exceptions option to " + session.getConnection());
}
return false;
}
return true;
}
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);
}
