Allow thread names to be specified using regex

1 files changed, 58 insertions, 0 deletions

diff --git a/spark-common/src/main/java/me/lucko/spark/util/Threads.java b/spark-common/src/main/java/me/lucko/spark/util/Threads.java
new file mode 100644
index 0000000..d1efdff
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/util/Threads.java
@@ -0,0 +1,58 @@
+/*
+ * 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;
+
+/**
+ * Utilities for working with {@link Thread}s.
+ */
+public final class Threads {
+
+    private Threads() {}
+
+    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;
+    }
+
+    /**
+     * Gets a stream of all known active threads.
+     *
+     * @return a stream of threads
+     */
+    public static Stream<Thread> getThreads() {
+        Thread[] threads = new Thread[ROOT_THREAD_GROUP.activeCount()];
+        while (ROOT_THREAD_GROUP.enumerate(threads, true ) == threads.length) {
+            threads = new Thread[threads.length * 2];
+        }
+        return Arrays.stream(threads).filter(Objects::nonNull);
+    }
+
+}