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/*
* This file is part of spark.
*
* Copyright (C) Albert Pham <http://www.sk89q.com>
* 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.sampler;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Uses the {@link ThreadMXBean} to generate {@link ThreadInfo} instances for the threads being
* sampled.
*/
@FunctionalInterface
public interface ThreadDumper {
/**
* Generates {@link ThreadInfo} data for the sampled threads.
*
* @param threadBean the thread bean instance to obtain the data from
* @return an array of generated thread info instances
*/
ThreadInfo[] dumpThreads(ThreadMXBean threadBean);
/**
* Implementation of {@link ThreadDumper} that generates data for all threads.
*/
ThreadDumper ALL = new All();
final class All implements ThreadDumper {
@Override
public ThreadInfo[] dumpThreads(ThreadMXBean threadBean) {
return threadBean.dumpAllThreads(false, false);
}
}
/**
* Implementation of {@link ThreadDumper} that generates data for a specific set of threads.
*/
final class Specific implements ThreadDumper {
private final long[] ids;
public Specific(long[] ids) {
this.ids = ids;
}
public Specific(Set<String> names) {
Set<String> threadNamesLower = names.stream().map(String::toLowerCase).collect(Collectors.toSet());
this.ids = Thread.getAllStackTraces().keySet().stream()
.filter(t -> threadNamesLower.contains(t.getName().toLowerCase()))
.mapToLong(Thread::getId)
.toArray();
}
@Override
public ThreadInfo[] dumpThreads(ThreadMXBean threadBean) {
return threadBean.getThreadInfo(this.ids, Integer.MAX_VALUE);
}
}
}
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