/*
* The MIT License
*
* Copyright (c) 2004-2011, Oracle Corporation, Kohsuke Kawaguchi, Brian Westrich, Jean-Baptiste Quenot,
* Stephen Connolly, Tom Huybrechts, Nikita Levyankov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package hudson.triggers;
import antlr.ANTLRException;
import hudson.DependencyRunner;
import hudson.DependencyRunner.ProjectRunnable;
import hudson.DescriptorExtensionList;
import hudson.Extension;
import hudson.ExtensionPoint;
import hudson.init.Initializer;
import hudson.model.AbstractProject;
import hudson.model.Action;
import hudson.model.Build;
import hudson.model.ComputerSet;
import hudson.model.Describable;
import hudson.model.Hudson;
import hudson.model.Item;
import hudson.model.PeriodicWork;
import hudson.model.Project;
import hudson.model.TopLevelItem;
import hudson.model.TopLevelItemDescriptor;
import hudson.scheduler.CronTab;
import hudson.scheduler.CronTabList;
import hudson.util.DoubleLaunchChecker;
import java.io.InvalidObjectException;
import java.io.ObjectStreamException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Timer;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;
import static hudson.init.InitMilestone.JOB_LOADED;
/**
* Triggers a {@link Build}.
*
* <p>
* To register a custom {@link Trigger} from a plugin,
* put {@link Extension} on your {@link TriggerDescriptor} class.
*
* @author Kohsuke Kawaguchi
*/
public abstract class Trigger<J extends Item> implements Describable<Trigger<?>>, ExtensionPoint {
/**
* Called when a {@link Trigger} is loaded into memory and started.
*
* @param project
* given so that the persisted form of this object won't have to have a back pointer.
* @param newInstance
* True if this is a newly created trigger first attached to the {@link Project}.
* False if this is invoked for a {@link Project} loaded from disk.
*/
public void start(J project, boolean newInstance) {
this.job = project;
}
/**
* Executes the triggered task.
*
* This method is invoked when {@link #Trigger(String)} is used
* to create an instance, and the crontab matches the current time.
*/
public void run() {}
/**
* Called before a {@link Trigger} is removed.
* Under some circumstances, this may be invoked more than once for
* a given {@link Trigger}, so be prepared for that.
*
* <p>
* When the configuration is changed for a project, all triggers
* are removed once and then added back.
*/
public void stop() {}
/**
* Returns an action object if this {@link Trigger} has an action
* to contribute to a {@link Project}.
*
* @deprecated as of 1.341
* Use {@link #getProjectActions()} instead.
*/
public Action getProjectAction() {
return null;
}
/**
* {@link Action}s to be displayed in the job page.
*
* @return
* can be empty but never null
* @since 1.341
*/
public Collection<? extends Action> getProjectActions() {
// delegate to getJobAction (singular) for backward compatible behavior
Action a = getProjectAction();
if (a==null) return Collections.emptyList();
return Collections.singletonList(a);
}
public TriggerDescriptor getDescriptor() {
return (TriggerDescriptor)Hudson.getInstance().getDescriptorOrDie(getClass());
}
protected final String spec;
protected transient CronTabList tabs;
protected transient J job;
/**
* Creates a new {@link Trigger} that gets {@link #run() run}
* periodically. This is useful when your trigger does
* some polling work.
*/
protected Trigger(String cronTabSpec) throws ANTLRException {
this.spec = cronTabSpec;
this.tabs = CronTabList.create(cronTabSpec);
}
/**
* Creates a new {@link Trigger} without using cron.
*/
protected Trigger() {
this.spec = "";
this.tabs = new CronTabList(Collections.<CronTab>emptyList());
}
/**
* Gets the crontab specification.
*
* If you are not using cron service, just ignore it.
*/
public final String getSpec() {
return spec;
}
protected Object readResolve() throws ObjectStreamException {
try {
tabs = CronTabList.create(spec);
} catch (ANTLRException e) {
InvalidObjectException x = new InvalidObjectException(e.getMessage());
x.initCause(e);
throw x;
}
return this;
}
/**
* Runs every minute to check {@link TimerTrigger} and schedules build.
*/
@Extension
public static class Cron extends PeriodicWork {
private final Calendar cal = new GregorianCalendar();
public long getRecurrencePeriod() {
return MIN;
}
public void doRun() {
while(new Date().getTime()-cal.getTimeInMillis()>1000) {
LOGGER.fine("cron checking "+cal.getTime().toLocaleString());
try {
checkTriggers(cal);
} catch (Throwable e) {
LOGGER.log(Level.WARNING,"Cron thread throw an exception",e);
// bug in the code. Don't let the thread die.
e.printStackTrace();
}
cal.add(Calendar.MINUTE,1);
}
}
}
private static Future previousSynchronousPolling;
public static void checkTriggers(final Calendar cal) {
Hudson inst = Hudson.getInstance();
// Are we using synchronous polling?
SCMTrigger.DescriptorImpl scmd = inst.getDescriptorByType(SCMTrigger.DescriptorImpl.class);
if (scmd.synchronousPolling) {
LOGGER.fine("using synchronous polling");
// Check that previous synchronous polling job is done to prevent piling up too many jobs
if (previousSynchronousPolling == null || previousSynchronousPolling.isDone()) {
// Process SCMTriggers in the order of dependencies. Note that the crontab spec expressed per-project is
// ignored, only the global setting is honored. The polling job is submitted only if the previous job has
// terminated.
// FIXME allow to set a global crontab spec
previousSynchronousPolling = scmd.getExecutor().submit(new DependencyRunner(new ProjectRunnable() {
public void run(AbstractProject p) {
for (Trigger t : (Collection<Trigger>) p.getTriggers().values()) {
if (t instanceof SCMTrigger) {
LOGGER.fine("synchronously triggering SCMTrigger for project " + t.job.getName());
t.run();
}
}
}
}));
} else {
LOGGER.fine("synchronous polling has detected unfinished jobs, will not trigger additional jobs.");
}
}
// Process all triggers, except SCMTriggers when synchronousPolling is set
for (AbstractProject<?,?> p : inst.getAllItems(AbstractProject.class)) {
for (Trigger t : p.getTriggers().values()) {
if (! (t instanceof SCMTrigger && scmd.synchronousPolling)) {
LOGGER.fine("cron checking "+p.getName());
if (t.tabs.check(cal)) {
LOGGER.config("cron triggered "+p.getName());
try {
t.run();
} catch (Throwable e) {
// t.run() is a plugin, and some of them throw RuntimeException and other things.
// don't let that cancel the polling activity. report and move on.
LOGGER.log(Level.WARNING, t.getClass().getName()+".run() failed for "+p.getName(),e);
}
}
}
}
}
}
private static final Logger LOGGER = Logger.getLogger(Trigger.class.getName());
/**
* This timer is available for all the components inside Hudson to schedule
* some work.
*
* Initialized and cleaned up by {@link Hudson}, but value kept here for compatibility.
*
* If plugins want to run periodic jobs, they should implement {@link PeriodicWork}.
*/
public static Timer timer;
@Initializer(after=JOB_LOADED)
public static void init() {
new DoubleLaunchChecker().schedule();
// start all PeridocWorks
for(PeriodicWork p : PeriodicWork.all())
timer.scheduleAtFixedRate(p,p.getInitialDelay(),p.getRecurrencePeriod());
// start monitoring nodes, although there's no hurry.
timer.schedule(new SafeTimerTask() {
public void doRun() {
ComputerSet.initialize();
}
}, 1000*10);
}
/**
* Returns all the registered {@link Trigger} descriptors.
*/
public static DescriptorExtensionList<Trigger<?>,TriggerDescriptor> all() {
return (DescriptorExtensionList)Hudson.getInstance().getDescriptorList(Trigger.class);
}
/**
* Returns a subset of {@link TriggerDescriptor}s that applys to the given item.
*/
public static List<TriggerDescriptor> for_(Item i) {
List<TriggerDescriptor> r = new ArrayList<TriggerDescriptor>();
for (TriggerDescriptor t : all()) {
if(!t.isApplicable(i)) continue;
if (i instanceof TopLevelItem) {// ugly
TopLevelItemDescriptor tld = ((TopLevelItem) i).getDescriptor();
// tld shouldn't be really null in contract, but we often write test Describables that
// doesn't have a Descriptor.
if(tld!=null && !tld.isApplicable(t)) continue;
}
r.add(t);
}
return r;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Trigger trigger = (Trigger) o;
if (spec != null ? !spec.equals(trigger.spec) : trigger.spec != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
return spec != null ? spec.hashCode() : 0;
}
}