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package com.c2kernel.process;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.HashMap;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.InvalidTransitionException;
import com.c2kernel.entity.C2KLocalObject;
import com.c2kernel.entity.agent.Job;
import com.c2kernel.entity.proxy.AgentProxy;
import com.c2kernel.entity.proxy.EntityProxyObserver;
import com.c2kernel.entity.proxy.MemberSubscription;
import com.c2kernel.lifecycle.instance.stateMachine.Transitions;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.utils.Logger;
/**************************************************************************
*
* $Revision: 1.31 $
* $Date: 2004/10/21 08:02:19 $
*
* Copyright (C) 2003 CERN - European Organization for Nuclear Research
* All rights reserved.
**************************************************************************/
public class UserCodeProcess extends StandardClient implements EntityProxyObserver<Job>, Runnable {
protected AgentProxy agent;
static boolean active = true;
ArrayList<String> ignoredPaths = new ArrayList<String>();
HashMap<String, C2KLocalObject> jobs;
public UserCodeProcess(String agentName, String agentPass) {
// login - try for a while in case server hasn't imported our user yet
for (int i=1;i<6;i++) {
try {
Logger.msg("Login attempt "+i+" of 5");
agent = Gateway.connect(agentName, agentPass);
break;
} catch (InvalidDataException ex) {
Logger.error("Could not log in.");
Logger.error(ex);
try {
Thread.sleep(5000);
} catch (InterruptedException ex2) { }
}
}
System.out.println(getDesc()+" initialised for " + agentName);
}
@Override
public void run() {
Thread.currentThread().setName("Usercode Process");
jobs = new HashMap<String, C2KLocalObject>();
// subscribe to job list
agent.subscribe(new MemberSubscription<Job>(this, ClusterStorage.JOB, true));
while (active) {
Job thisJob = null;
synchronized (jobs) {
if (jobs.size() > 0) {
thisJob = getJob(jobs, Transitions.COMPLETE);
if (thisJob == null)
thisJob = getJob(jobs, Transitions.START);
if (thisJob == null)
thisJob = getJob(jobs, Transitions.SUSPEND);
if (thisJob == null)
thisJob = getJob(jobs, Transitions.RESUME);
if (thisJob == null) {
Logger.error("No supported jobs, but joblist is not empty! Discarding remaining jobs");
jobs.clear();
}
else
jobs.remove(ClusterStorage.getPath(thisJob));
}
}
if (thisJob != null) {
String jobKey = thisJob.getItemSysKey()+":"+thisJob.getStepPath();
try {
if (thisJob.getPossibleTransition()==Transitions.START) {
Logger.msg(5, "Testing start conditions");
boolean start = assessStartConditions(thisJob);
if (start) {
Logger.msg(5, "Attempting to start");
agent.execute(thisJob);
}
else {
Logger.msg(5, "Start conditions failed "+thisJob.getStepName()+" in "+thisJob.getItemSysKey());
}
}
else if (thisJob.getPossibleTransition()==Transitions.COMPLETE) {
Logger.msg(5, "Executing logic");
runUCLogic(thisJob);
if (ignoredPaths.contains(jobKey))
ignoredPaths.remove(jobKey);
}
else if (thisJob.getPossibleTransition()==Transitions.SUSPEND) {
if (ignoredPaths.contains(jobKey))
agent.execute(thisJob);
}
else if (thisJob.getPossibleTransition()==Transitions.RESUME) {
if (!ignoredPaths.contains(jobKey))
agent.execute(thisJob);
}
} catch (InvalidTransitionException ex) {
// must have already been done by someone else - ignore
} catch (Throwable ex) {
Logger.error("Error executing "+Transitions.getTransitionName(thisJob.getPossibleTransition())+" job:");
Logger.error(ex);
ignoredPaths.add(jobKey);
}
}
try {
synchronized (jobs) {
if (jobs.size() == 0) {
Logger.msg("Sleeping");
while (active && jobs.size() == 0)
jobs.wait(2000);
}
}
} catch (InterruptedException ex) { }
}
// shut down
try
{
Gateway.close();
}
catch( Exception ex )
{
Logger.error(ex);
}
}
private static Job getJob(HashMap<String, C2KLocalObject> jobs, int transition) {
for (C2KLocalObject c2kLocalObject : jobs.values()) {
Job thisJob = (Job)c2kLocalObject;
if (thisJob.getPossibleTransition() == transition) {
Logger.msg(1,"=================================================================");
Logger.msg(1, "Got "+Transitions.getTransitionName(transition)+" job for "+thisJob.getStepName()+" in "+thisJob.getItemSysKey());
return thisJob;
}
}
return null;
}
public boolean assessStartConditions(Job job) {
// default implementation - has no start conditions.
return true;
}
public void runUCLogic(Job job) throws Exception {
// default implementation - the agent will execute any scripts defined when we execute
agent.execute(job);
}
/**
* Receives job from the AgentProxy. Reactivates thread if sleeping.
*/
@Override
public void add(Job contents) {
synchronized(jobs) {
Logger.msg(7, "Adding "+ClusterStorage.getPath(contents));
jobs.put(ClusterStorage.getPath(contents), contents);
jobs.notify();
}
}
@Override
public void control(String control, String msg) {
if (control == MemberSubscription.ERROR)
Logger.error("Error in job subscription: "+msg);
}
/**
* Removes job removal notification from the AgentProxy.
*/
@Override
public void remove(String id) {
synchronized(jobs) {
Logger.msg(7, "Deleting "+id);
jobs.remove(id);
}
}
public static UserCodeProcess getInstance() throws UnknownHostException {
return new UserCodeProcess(InetAddress.getLocalHost().getHostName(), "uc");
}
static public void main(String[] args)
{
int status = 0;
try
{
Gateway.init(readC2KArgs(args), false);
UserCodeProcess proc = getInstance();
new Thread(proc).start();
Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
@Override
public void run() {
shutdown();
}
}));
}
catch( Exception ex )
{
Logger.error(ex);
try
{
Gateway.close();
}
catch(Exception ex1)
{
Logger.error(ex1);
}
status = 1;
System.exit(status);
}
}
public String getDesc() {
return("Usercode Process");
}
public static void shutdown() {
active = false;
}
}
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