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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.concurrent;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* @author baldersheim
*/
public class ThreadFactoryFactory {
static private final Map<String, PooledFactory> factory = new HashMap<>();
static public synchronized ThreadFactory getThreadFactory(String name) {
PooledFactory p = factory.get(name);
if (p == null) {
p = new PooledFactory(name);
factory.put(name, p);
}
return p.getFactory(false);
}
static public synchronized ThreadFactory getDaemonThreadFactory(String name) {
PooledFactory p = factory.get(name);
if (p == null) {
p = new PooledFactory(name);
factory.put(name, p);
}
return p.getFactory(true);
}
private static class PooledFactory {
private final String name;
private final AtomicInteger poolId = new AtomicInteger(1);
private static class Factory implements ThreadFactory {
final ThreadGroup group;
final AtomicInteger threadNumber = new AtomicInteger(1);
final String namePrefix;
final boolean isDaemon;
@SuppressWarnings("removal")
Factory(String name, boolean isDaemon) {
this.isDaemon = isDaemon;
SecurityManager s = System.getSecurityManager();
group = (s != null)
? s.getThreadGroup()
: Thread.currentThread().getThreadGroup();
namePrefix = name;
}
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
if (t.isDaemon() != isDaemon) {
t.setDaemon(isDaemon);
}
if (t.getPriority() != Thread.NORM_PRIORITY) {
t.setPriority(Thread.NORM_PRIORITY);
}
return t;
}
}
PooledFactory(String name) {
this.name = name;
}
ThreadFactory getFactory(boolean isDaemon) {
return new Factory(name + "-" + poolId.getAndIncrement() + "-thread-", isDaemon);
}
}
}
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