com.techempower.gemini.event.NoOpEvent Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of gemini Show documentation
Show all versions of gemini Show documentation
Gemini is a web framework created by TechEmpower.
/*******************************************************************************
* Copyright (c) 2018, TechEmpower, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name TechEmpower, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL TECHEMPOWER, INC. BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************/
package com.techempower.gemini.event;
import java.util.*;
import com.techempower.gemini.*;
import com.techempower.helper.*;
import com.techempower.scheduler.*;
import com.techempower.util.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Does nothing; for testing/demonstration purposes only. Typical usage for
* events is to instantiate and schedule events in the "start" method of
* the Infrastructure subclass. E.g.,
*
* public void start()
* {
* getScheduler().clear();
* getScheduler().scheduleEvent(new NoOpEvent(this.application));
* }
*
*/
public class NoOpEvent
extends ScheduledEvent
implements Configurable
{
//
// Member variables.
//
private final GeminiApplication application;
private final Logger log = LoggerFactory.getLogger(getClass());
//
// Member methods.
//
/**
* Constructor.
*/
public NoOpEvent(GeminiApplication application)
{
super("No operation / Testing",
"Executes for 30 seconds but does nothing; safe for testing");
// Get local references set up.
this.application = application;
// Get configured.
this.application.getConfigurator().addConfigurable(this);
}
/**
* Configures this component.
*/
@Override
public void configure(EnhancedProperties props)
{
// Sometimes the time of day for an event is configurable, so events
// commonly implement the Configurable interface.
// In this demonstration, however, we are doing nothing.
}
/**
* Gets the initial/default scheduled time for the first run of this
* event.
*/
@Override
public long getDefaultScheduledTime()
{
// Get a current-time SimpleDate.
Calendar nextRun = DateHelper.getCalendarInstance();
// In this example, we're going to specify an initial execution of
// 12:30pm. We can't just set the hour to 12 because we may be
// starting up after that time, so we'll just add hours until we get
// to 12:30pm. This is a rough calculation, but good enough.
// Find 12pm.
nextRun.add(Calendar.HOUR_OF_DAY, 1);
while (nextRun.get(Calendar.HOUR_OF_DAY) != 12)
{
nextRun.add(Calendar.HOUR_OF_DAY, 1);
}
// Set the minutes and seconds accordingly.
nextRun.set(Calendar.MINUTE, 30);
nextRun.set(Calendar.SECOND, 0);
// Return the time.
return nextRun.getTimeInMillis();
}
/**
* Overload this method to return true if this event needs to be run
* on a thread separate from the Scheduler itself. By default, events
* get run ON the scheduler thread.
*/
@Override
public boolean requiresOwnThread()
{
// Let's get a separate thread.
return true;
}
/**
* Executes this event.
*
* @param scheduler A reference to the scheduler so that we can reschedule
* this event after execution is complete.
* @param onDemandExecute true if an administrator has requested an on-
* demand execution of this event; false if the event is running
* according to its schedule.
*/
@Override
public void execute(Scheduler scheduler, boolean onDemandExecute)
{
// We wrap the actual work in a try/catch block so that even if the
// run is interrupted by an uncaught exception, we'll reschedule
// properly.
try
{
// Call our example do-nothing method.
doNothing();
}
catch (Exception exc)
{
this.log.error("Exception", exc);
}
// Log the event completion.
this.log.info("{} complete.", this);
// If this execution was a scheduled execution, let's reschedule for
// the same time, but one day later.
if (!onDemandExecute)
{
// Reschedule this event.
Calendar newEventTime = DateHelper.getCalendarInstance(getScheduledTime());
// Add a day.
newEventTime.add(Calendar.DATE, 1);
// Tell the scheduler to reschedule.
scheduler.scheduleEvent(this, newEventTime.getTime());
}
}
/**
* Does nothing; this is a no-op event.
*/
public void doNothing()
{
this.log.info("Doing nothing; this is a no-op event.");
}
/**
* Standard toString.
*/
@Override
public String toString()
{
return "[NoOpEvent: " + getScheduledTime() + "]";
}
} // End NoOpEvent.