package play.jobs;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import play.Logger;
import play.Play;
import play.PlayPlugin;
import play.exceptions.PlayException;
import play.exceptions.UnexpectedException;
import play.libs.Expression;
import play.libs.Time;
import play.libs.Time.CronExpression;
import play.utils.Java;
import play.utils.PThreadFactory;
public class JobsPlugin extends PlayPlugin {
public static ScheduledThreadPoolExecutor executor = null;
public static List<Job> scheduledJobs = null;
@Override
public String getStatus() {
StringWriter sw = new StringWriter();
PrintWriter out = new PrintWriter(sw);
if (executor == null) {
out.println("Jobs execution pool:");
out.println("~~~~~~~~~~~~~~~~~~~");
out.println("(not yet started)");
return sw.toString();
}
out.println("Jobs execution pool:");
out.println("~~~~~~~~~~~~~~~~~~~");
out.println("Pool size: " + executor.getPoolSize());
out.println("Active count: " + executor.getActiveCount());
out.println("Scheduled task count: " + executor.getTaskCount());
out.println("Queue size: " + executor.getQueue().size());
SimpleDateFormat df = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
if (!scheduledJobs.isEmpty()) {
out.println();
out.println("Scheduled jobs ("+scheduledJobs.size()+"):");
out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~");
for (Job job : scheduledJobs) {
out.print(job.getClass().getName());
if (job.getClass().isAnnotationPresent(OnApplicationStart.class)) {
OnApplicationStart appStartAnnotation = job.getClass().getAnnotation(OnApplicationStart.class);
out.print(" run at application start" + (appStartAnnotation.async()?" (async)" : "") + ".");
}
if( job.getClass().isAnnotationPresent(On.class)) {
String cron = job.getClass().getAnnotation(On.class).value();
if (cron != null && cron.startsWith("cron.")) {
cron = Play.configuration.getProperty(cron);
}
out.print(" run with cron expression " + cron + ".");
}
if (job.getClass().isAnnotationPresent(Every.class)) {
out.print(" run every " + job.getClass().getAnnotation(Every.class).value() + ".");
}
if (job.lastRun > 0) {
out.print(" (last run at " + df.format(new Date(job.lastRun)));
if(job.wasError) {
out.print(" with error)");
} else {
out.print(")");
}
} else {
out.print(" (has never run)");
}
out.println();
}
}
if (!executor.getQueue().isEmpty()) {
out.println();
out.println("Waiting jobs:");
out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~");
for (Object o : executor.getQueue()) {
ScheduledFuture task = (ScheduledFuture)o;
out.println(Java.extractUnderlyingCallable((FutureTask)task) + " will run in " + task.getDelay(TimeUnit.SECONDS) + " seconds");
}
}
return sw.toString();
}
@Override
public void afterApplicationStart() {
List<Class<?>> jobs = new ArrayList<Class<?>>();
for (Class clazz : Play.classloader.getAllClasses()) {
if (Job.class.isAssignableFrom(clazz)) {
jobs.add(clazz);
}
}
scheduledJobs = new ArrayList<Job>();
for (final Class<?> clazz : jobs) {
// @OnApplicationStart
if (clazz.isAnnotationPresent(OnApplicationStart.class)) {
//check if we're going to run the job sync or async
OnApplicationStart appStartAnnotation = clazz.getAnnotation(OnApplicationStart.class);
if( !appStartAnnotation.async()) {
//run job sync
try {
Job<?> job = ((Job<?>) clazz.newInstance());
scheduledJobs.add(job);
job.run();
if(job.wasError) {
if(job.lastException != null) {
throw job.lastException;
}
throw new RuntimeException("@OnApplicationStart Job has failed");
}
} catch (InstantiationException e) {
throw new UnexpectedException("Job could not be instantiated", e);
} catch (IllegalAccessException e) {
throw new UnexpectedException("Job could not be instantiated", e);
} catch (Throwable ex) {
if (ex instanceof PlayException) {
throw (PlayException) ex;
}
throw new UnexpectedException(ex);
}
} else {
//run job async
try {
Job<?> job = ((Job<?>) clazz.newInstance());
scheduledJobs.add(job);
//start running job now in the background
@SuppressWarnings("unchecked")
Callable<Job> callable = (Callable<Job>)job;
executor.submit(callable);
} catch (InstantiationException ex) {
throw new UnexpectedException("Cannot instanciate Job " + clazz.getName());
} catch (IllegalAccessException ex) {
throw new UnexpectedException("Cannot instanciate Job " + clazz.getName());
}
}
}
// @On
if (clazz.isAnnotationPresent(On.class)) {
try {
Job<?> job = ((Job<?>) clazz.newInstance());
scheduledJobs.add(job);
scheduleForCRON(job);
} catch (InstantiationException ex) {
throw new UnexpectedException("Cannot instanciate Job " + clazz.getName());
} catch (IllegalAccessException ex) {
throw new UnexpectedException("Cannot instanciate Job " + clazz.getName());
}
}
// @Every
if (clazz.isAnnotationPresent(Every.class)) {
try {
Job job = (Job) clazz.newInstance();
scheduledJobs.add(job);
String value = job.getClass().getAnnotation(Every.class).value();
if (value.startsWith("cron.")) {
value = Play.configuration.getProperty(value);
}
value = Expression.evaluate(value, value).toString();
if(!"never".equalsIgnoreCase(value)){
executor.scheduleWithFixedDelay(job, Time.parseDuration(value), Time.parseDuration(value), TimeUnit.SECONDS);
}
} catch (InstantiationException ex) {
throw new UnexpectedException("Cannot instanciate Job " + clazz.getName());
} catch (IllegalAccessException ex) {
throw new UnexpectedException("Cannot instanciate Job " + clazz.getName());
}
}
}
}
@Override
public void onApplicationStart() {
int core = Integer.parseInt(Play.configuration.getProperty("play.jobs.pool", "10"));
executor = new ScheduledThreadPoolExecutor(core, new PThreadFactory("jobs"), new ThreadPoolExecutor.AbortPolicy());
}
public static <V> void scheduleForCRON(Job<V> job) {
if (!job.getClass().isAnnotationPresent(On.class)) {
return;
}
String cron = job.getClass().getAnnotation(On.class).value();
if (cron.startsWith("cron.")) {
cron = Play.configuration.getProperty(cron);
}
cron = Expression.evaluate(cron, cron).toString();
if (cron == null || "".equals(cron) || "never".equalsIgnoreCase(cron)) {
Logger.info("Skipping job %s, cron expression is not defined", job.getClass().getName());
return;
}
try {
Date now = new Date();
cron = Expression.evaluate(cron, cron).toString();
CronExpression cronExp = new CronExpression(cron);
Date nextDate = cronExp.getNextValidTimeAfter(now);
if (nextDate == null) {
Logger.warn("The cron expression for job %s doesn't have any match in the future, will never be executed", job.getClass().getName());
return;
}
if (nextDate.equals(job.nextPlannedExecution)) {
// Bug #13: avoid running the job twice for the same time
// (happens when we end up running the job a few minutes before the planned time)
Date nextInvalid = cronExp.getNextInvalidTimeAfter(nextDate);
nextDate = cronExp.getNextValidTimeAfter(nextInvalid);
}
job.nextPlannedExecution = nextDate;
executor.schedule((Callable<V>)job, nextDate.getTime() - now.getTime(), TimeUnit.MILLISECONDS);
job.executor = executor;
} catch (Exception ex) {
throw new UnexpectedException(ex);
}
}
@Override
public void onApplicationStop() {
executor.shutdownNow();
executor.getQueue().clear();
}
}