/**
* Copyright (C) 2010-2014 Morgner UG (haftungsbeschränkt)
*
* This file is part of Structr <http://structr.org>.
*
* Structr is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Structr is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Structr. If not, see <http://www.gnu.org/licenses/>.
*/
package org.structr.cron;
import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.structr.core.Command;
import org.structr.core.RunnableService;
import org.structr.core.Services;
import org.structr.agent.Task;
import org.structr.common.StructrConf;
import org.structr.core.app.StructrApp;
/**
* A service that keeps track of registered tasks and runs
* them at their scheduled time.
*
* @author Christian Morgner
*/
public class CronService extends Thread implements RunnableService {
private static final Logger logger = Logger.getLogger(CronService.class.getName());
public static final String TASKS = "CronService.tasks";
public static final String EXPRESSION_SUFFIX = ".cronExpression";
public static final TimeUnit GRANULARITY_UNIT = TimeUnit.SECONDS;
public static final long GRANULARITY = 1;
public static final int NUM_FIELDS = 6;
private LinkedList<CronEntry> cronEntries = new LinkedList<>();
private boolean doRun = false;
public CronService() {
super("CronService");
}
@Override
public void run() {
final Services servicesInstance = Services.getInstance();
// wait for service layer to be initialized
while(!servicesInstance.isInitialized()) {
try { Thread.sleep(1000); } catch(InterruptedException iex) { }
}
// sleep 5 seconds more
try { Thread.sleep(5000); } catch(InterruptedException iex) { }
while(doRun) {
// sleep for some time
try { Thread.sleep(GRANULARITY_UNIT.toMillis(GRANULARITY)); } catch(InterruptedException iex) { }
for(CronEntry entry : cronEntries) {
if(entry.getDelayToNextExecutionInMillis() < GRANULARITY_UNIT.toMillis(GRANULARITY)) {
String taskClassName = entry.getName();
try {
Class taskClass = Class.forName(taskClassName);
Task task = (Task)taskClass.newInstance();
logger.log(Level.FINE, "Starting task {0}", taskClassName);
StructrApp.getInstance().processTasks(task);
} catch(Throwable t) {
logger.log(Level.WARNING, "Could not start task {0}: {1}", new Object[] { taskClassName, t.getMessage() } );
}
}
}
}
}
// ----- interface RunnableService -----
@Override
public void startService() {
this.doRun = true;
this.start();
}
@Override
public void stopService() {
this.doRun = false;
}
@Override
public boolean runOnStartup() {
return true;
}
@Override
public boolean isRunning() {
return doRun;
}
@Override
public void injectArguments(Command command) {
}
@Override
public void initialize(final StructrConf config) {
final String taskList = config.getProperty(TASKS, "");
if (taskList != null) {
for(String task : taskList.split("[ \\t]+")) {
String expression = config.getProperty(task.concat(EXPRESSION_SUFFIX));
if(expression != null) {
CronEntry entry = CronEntry.parse(task, expression);
if(entry != null) {
logger.log(Level.INFO, "Adding cron entry {0} for {1}", new Object[]{ entry, task });
cronEntries.add(entry);
} else {
logger.log(Level.WARNING, "Unable to parse cron expression for taks {0}, ignoring.", task);
}
} else {
logger.log(Level.WARNING, "No cron expression for task {0}, ignoring.", task);
}
}
}
}
@Override
public void initialized() {}
@Override
public void shutdown() {
this.doRun = false;
}
@Override
public boolean isVital() {
return false;
}
}