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author | Luck <git@lucko.me> | 2019-04-16 21:37:59 +0100 |
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committer | Luck <git@lucko.me> | 2019-04-16 21:37:59 +0100 |
commit | ecd4cec8545460a4fc4ca65b911c2503a00cd8e7 (patch) | |
tree | 62067383a1044abc3a09724e89c6e7c619e87ec0 /spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java | |
parent | 8a61b404848ed8e3c27f06eb73239d37d4273240 (diff) | |
download | spark-ecd4cec8545460a4fc4ca65b911c2503a00cd8e7.tar.gz spark-ecd4cec8545460a4fc4ca65b911c2503a00cd8e7.tar.bz2 spark-ecd4cec8545460a4fc4ca65b911c2503a00cd8e7.zip |
Lots of refactoring, add tps command
Diffstat (limited to 'spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java')
-rw-r--r-- | spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java b/spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java deleted file mode 100644 index 8ba7b10..0000000 --- a/spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java +++ /dev/null @@ -1,60 +0,0 @@ -/* - * 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.util; - -import java.util.Arrays; -import java.util.Objects; -import java.util.stream.Stream; - -/** - * Utility to find active threads. - */ -public final class ThreadFinder { - - private static final ThreadGroup ROOT_THREAD_GROUP; - static { - ThreadGroup rootGroup = Thread.currentThread().getThreadGroup(); - ThreadGroup parentGroup; - while ((parentGroup = rootGroup.getParent()) != null) { - rootGroup = parentGroup; - } - ROOT_THREAD_GROUP = rootGroup; - } - - // cache the approx active count at the time of construction. - // the usages of this class are likely to be somewhat short-lived, so it's good - // enough to just cache a value on init. - private final int approxActiveCount = ROOT_THREAD_GROUP.activeCount(); - - /** - * Gets a stream of all known active threads. - * - * @return a stream of threads - */ - public Stream<Thread> getThreads() { - Thread[] threads = new Thread[this.approxActiveCount + 20]; // +20 to allow a bit of growth for newly created threads - while (ROOT_THREAD_GROUP.enumerate(threads, true) == threads.length) { - threads = new Thread[threads.length * 2]; - } - return Arrays.stream(threads).filter(Objects::nonNull); - } - -} |