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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.sampler;
import java.util.concurrent.atomic.AtomicReference;
/**
* Container for the active sampler.
*/
public class SamplerContainer implements AutoCloseable {
private final AtomicReference<Sampler> activeSampler = new AtomicReference<>();
/**
* Gets the active sampler, or null if a sampler is not active.
*
* @return the active sampler
*/
public Sampler getActiveSampler() {
return this.activeSampler.get();
}
/**
* Sets the active sampler, throwing an exception if another sampler is already active.
*
* @param sampler the sampler
*/
public void setActiveSampler(Sampler sampler) {
if (!this.activeSampler.compareAndSet(null, sampler)) {
throw new IllegalStateException("Attempted to set active sampler when another was already active!");
}
}
/**
* Unsets the active sampler, if the provided sampler is active.
*
* @param sampler the sampler
*/
public void unsetActiveSampler(Sampler sampler) {
this.activeSampler.compareAndSet(sampler, null);
}
/**
* Stops the active sampler, if there is one.
*/
public void stopActiveSampler(boolean cancelled) {
Sampler sampler = this.activeSampler.getAndSet(null);
if (sampler != null) {
sampler.stop(cancelled);
}
}
@Override
public void close() {
stopActiveSampler(true);
}
}
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