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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc.component;
import com.yahoo.component.AbstractComponent;
import com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.container.di.ComponentDeconstructor;
import com.yahoo.container.di.componentgraph.Provider;
import com.yahoo.jdisc.SharedResource;
import com.yahoo.log.LogLevel;
import java.security.SecureRandom;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import static java.util.logging.Level.WARNING;
/**
* @author tonyv
* @author gv
*/
public class Deconstructor implements ComponentDeconstructor {
private static final Logger log = Logger.getLogger(Deconstructor.class.getName());
private final ScheduledExecutorService executor =
Executors.newScheduledThreadPool(1, ThreadFactoryFactory.getThreadFactory("deconstructor"));
private final int delay;
public Deconstructor(boolean delayDeconstruction) {
delay = delayDeconstruction ? 60 : 0;
}
@Override
public void deconstruct(Object component) {
if (component instanceof AbstractComponent) {
AbstractComponent abstractComponent = (AbstractComponent) component;
if (abstractComponent.isDeconstructable()) {
executor.schedule(new DestructComponentTask(abstractComponent), delay, TimeUnit.SECONDS);
}
} else if (component instanceof Provider) {
log.info("Starting deconstruction of " + component);
((Provider)component).deconstruct();
log.info("Finished deconstructing " + component);
} else if (component instanceof SharedResource) {
// No need to delay release, as jdisc does ref-counting
log.info("Starting deconstruction of " + component);
((SharedResource)component).release();
log.info("Finished deconstructing " + component);
}
}
private static class DestructComponentTask implements Runnable {
private final AbstractComponent component;
DestructComponentTask(AbstractComponent component) {
this.component = component;
}
/** Returns a random value which will be different across identical containers invoking this at the same time */
private long random() {
return new SecureRandom().nextLong();
}
public void run() {
log.info("Starting deconstruction of " + component);
try {
component.deconstruct();
log.info("Finished deconstructing " + component);
}
catch (Exception | NoClassDefFoundError e) { // May get class not found due to it being already unloaded
log.log(WARNING, "Exception thrown when deconstructing " + component, e);
}
catch (Error e) {
try {
// Randomize restart over 10 minutes to avoid simultaneous cluster restarts
long randomSleepSeconds = random() * 60 * 10;
log.log(LogLevel.FATAL, "Error when deconstructing " + component + " Will sleep for " +
randomSleepSeconds + " seconds then restart", e);
Thread.sleep(randomSleepSeconds * 1000);
}
catch (InterruptedException exception) {
log.log(WARNING, "Randomized wait before dying disrupted. Dying now.");
}
com.yahoo.protect.Process.logAndDie("Shutting down due to error when deconstructing " + component);
}
catch (Throwable e) {
log.log(WARNING, "Non-error not exception throwable thrown when deconstructing " + component, e);
}
}
}
}
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