com.github.triceo.robozonky.app.investing.SuddenDeathDetection Maven / Gradle / Ivy
/*
* Copyright 2017 Lukáš Petrovický
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.triceo.robozonky.app.investing;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* For whatever reason, if the marketplace stops being repeatedly checked, the robot is effectively dead. And we can
* not get any reasonable logs, since we usually find out days after this has happened.
*
* This little piece of code is designed to detect such a situation. Surrounding code will then take this and kill
* the robot, sending a warning e-mail. When that happens, we will have up-to-date logs and will be able to identify
* the culprit.
*/
class SuddenDeathDetection implements Runnable {
private static final Logger LOGGER = LoggerFactory.getLogger(SuddenDeathDetection.class);
private final Semaphore daemonStopsIfReleased;
private final AtomicInteger missedChecks = new AtomicInteger(0);
private final AtomicBoolean suddenDeath = new AtomicBoolean(false);
private final int missedChecksThreshold;
public SuddenDeathDetection(final Semaphore daemonStopsIfReleased, final int missedChecksThreshold) {
this.daemonStopsIfReleased = daemonStopsIfReleased;
this.missedChecksThreshold = missedChecksThreshold;
}
public void registerMarketplaceCheck() {
missedChecks.set(0);
}
public boolean isSuddenDeath() {
return suddenDeath.get();
}
@Override
public void run() {
try {
if (isSuddenDeath()) { // nothing to do
return;
}
final int missing = missedChecks.incrementAndGet();
if (missing > missedChecksThreshold) {
SuddenDeathDetection.LOGGER.error("Sudden death is here.");
suddenDeath.set(true); // make the rest of the code notice the sudden death
daemonStopsIfReleased.release(); // kill daemon and report
} else if (missing == ((missedChecksThreshold / 10) * 9)) {
SuddenDeathDetection.LOGGER.warn("Sudden death is just around the corner.");
}
} catch (final Throwable t) { // not catching here would stop the thread, disabling sudden death detection
SuddenDeathDetection.LOGGER.warn("Sudden death workaround error.", t);
}
}
}