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// Copyright 2016 Yahoo Inc. 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 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.getDaemonThreadFactory("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()) {
log.info("Scheduling deconstruction of " + abstractComponent);
executor.schedule(new DestructComponentTask(abstractComponent), delay, TimeUnit.SECONDS);
}
} else if (component instanceof Provider) {
((Provider)component).deconstruct();
} else if (component instanceof SharedResource) {
// No need to delay release, as jdisc does ref-counting
((SharedResource)component).release();
}
}
private static class DestructComponentTask implements Runnable {
private final AbstractComponent component;
DestructComponentTask(AbstractComponent component) {
this.component = component;
}
public void run() {
log.info("Starting deconstruction of " + component);
try {
component.deconstruct();
log.info("Finished deconstructing " + component);
} catch (Error e) {
try {
Thread.sleep((long) (new Random(System.nanoTime()).nextDouble() * 180 * 1000));
} catch (InterruptedException e) { }
com.yahoo.protect.Process.logAndDie("Error when deconstructing " + component, e);
} catch (Exception e) {
log.log(WARNING, "Exception thrown when deconstructing " + component, e);
} catch (Throwable t) {
log.log(WARNING, "Unexpected Throwable thrown when deconstructing " + component, t);
}
}
}
}
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