private TaskObjectsExecutionResults runObject(TaskObjectsExecutionRequest obj)
throws IOException, PDBatchTaskExecutorException {
Object res = null;
try {
setAvailability(false);
_oos.writeObject(obj);
_oos.flush();
res = _ois.readObject();
setAvailability(true);
} catch (IOException e) { // worker closed connection
processException(e);
throw e;
} catch (ClassNotFoundException e) {
processException(e);
throw new IOException("stream has failed");
}
if (res instanceof TaskObjectsExecutionResults) {
_isPrevRunSuccess = true;
return (TaskObjectsExecutionResults) res;
} else {
PDBatchTaskExecutorException e =
new PDBatchTaskExecutorException("worker failed to run tasks");
if (_isPrevRunSuccess == false && !sameAsPrevFailedJob(obj._tasks)) {
processException(e); // twice a loser, kick worker out
}
_isPrevRunSuccess = false;
_prevFailedBatch = obj._tasks;
throw e;
}
}
private void secondChance(RRObject obj) throws ClassNotFoundException, IOException {
try {
obj.runProtocol(_srv, _ois, _oos);
} catch (PDBatchTaskExecutorException e2) {
utils.Messenger.getInstance()
.msg(
"PDBTEC2ListenerThread.run(): sending NoWorkerAvailableResponse() to client...", 1);
// e.printStackTrace();
_oos.writeObject(new NoWorkerAvailableResponse(((TaskObjectsExecutionRequest) obj)._tasks));
_oos.flush();
} catch (IOException e2) {
utils.Messenger.getInstance()
.msg("PDBTEC2ListenerThread.run(): sending FailedReply to client...", 1);
// e.printStackTrace();
_oos.writeObject(new FailedReply());
_oos.flush();
}
}
/**
* no need to synchronize any block in this method, as it is already synchronized on _srv since
* it's only called by the <CODE>_srv.addNewWorkerConnection(s)</CODE> method.
*
* @throws IOException
*/
private void init() throws IOException {
// wait until the _initCmd is ready, and send it over the socket
while (_initCmd == null) {
try {
utils.Messenger.getInstance()
.msg(
"PDBTExecSingleCltWrkInitSrv.PDBTEW2Listener.init(): "
+ "W2Thread waiting on server to obtain init_cmd from client...",
1);
_srv.wait(); // the thread calling this method is already synchronized on _srv.
} catch (InterruptedException e) {
// e.printStackTrace();
Thread.currentThread().interrupt();
}
}
_oos.writeObject(_initCmd);
_oos.flush();
utils.Messenger.getInstance()
.msg("PDBTExecSingleCltWrkInitSrv.PDBTEW2Listener.init(): done.", 1);
}
/**
* reads from the input stream the initialization command sent to it, sends back to the client
* an <CODE>OKReply</CODE> "ACK" msg, and then enters an infinite loop waiting to read from the
* input stream an <CODE>RRObject</CODE> obj that should really be of type <CODE>
* TaskObjectsExecutionRequest</CODE>, on which it executes its method <CODE>
* obj.runProtocol(_srv,_ois, _oos)</CODE>.
*/
public void run() {
// first, read from socket the worker-initialization object that will
// be broadcast for execution to every worker connecting to this server.
utils.Messenger mger = utils.Messenger.getInstance();
try {
mger.msg("PDBTEC2ListenerThread: waiting to read the init_cmd from client", 1);
RRObject initCmd = (RRObject) _ois.readObject();
mger.msg("PDBTEC2ListenerThread: done reading the init_cmd from client", 1);
setInitCmd(initCmd);
mger.msg("PDBTEC2ListenerThread: done setting the init_cmd", 2);
// send back to the clt an "ACK" message
_oos.writeObject(new OKReply());
_oos.flush();
mger.msg("PDBTEC2ListenerThread: done sending OKReply through the socket", MIN_PRIORITY);
} catch (Exception e) { // client closed connection
// e.printStackTrace();
try {
_ois.close();
_oos.close();
_s.close();
} catch (Exception e2) {
// e2.printStackTrace();
}
mger.msg("PDBTEC2ListenerThread: Client Network Connection Closed", 0);
System.exit(-1);
}
while (true) {
try {
mger.msg("PDBTEC2ListenerThread.run(): waiting to read an RRObject...", 2);
// 1. read from socket input
RRObject obj = (RRObject) _ois.readObject(); // obj is an TaskObjectsExecutionRequest
mger.msg("PDBTEC2ListenerThread.run(): RRObject read", 2);
// 2. take appropriate action
try {
obj.runProtocol(_srv, _ois, _oos);
} catch (PDBatchTaskExecutorException e) {
mger.msg(
"PDBTEC2ListenerThread.run(): calling obj.runProtocol() "
+ "issued PDBatchTaskExecutorException, will try one more time.",
1);
secondChance(obj);
} catch (
IOException e) { // worker somehow failed, give srv one more shot, then notify client
mger.msg(
"PDBTEC2ListenerThread.run(): calling obj.runProtocol() "
+ "issued IOException, will try one more time.",
1);
secondChance(obj);
}
} catch (Exception e) { // client closed connection
// e.printStackTrace();
try {
_ois.close();
_oos.close();
_s.close();
} catch (Exception e2) {
// e2.printStackTrace();
}
mger.msg(
"PDBTExecSingleCltWrkInitSrv: Client Network Connection Closed "
+ "(exception '"
+ e
+ "' caught)",
0);
System.exit(-1);
}
}
}