/
DefaultThreadFactory.java
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/
DefaultThreadFactory.java
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/*
* Copyright © 2018-2019 Apple Inc. and the ServiceTalk project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.servicetalk.concurrent.api;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import javax.annotation.Nullable;
import static java.lang.Thread.NORM_PRIORITY;
import static java.util.Objects.requireNonNull;
/**
* A {@link ThreadFactory} implementation.
*/
public final class DefaultThreadFactory implements ThreadFactory {
private static final AtomicInteger factoryCount = new AtomicInteger();
public static final String DEFAULT_NAME_PREFIX = "servicetalk-executor";
private final String namePrefix;
private final boolean daemon;
private final int priority;
@SuppressWarnings("unused")
private final AtomicInteger threadCount = new AtomicInteger();
/**
* New instance that creates daemon threads with {@link Thread#NORM_PRIORITY} priority.
*/
public DefaultThreadFactory() {
this(true);
}
/**
* New instance that creates threads with {@link Thread#NORM_PRIORITY} priority.
*
* @param daemon {@code true} if the created threads should be daemons.
*/
public DefaultThreadFactory(boolean daemon) {
this(daemon, NORM_PRIORITY);
}
/**
* New instance that creates daemon threads.
*
* @param priority for the created threads.
*/
public DefaultThreadFactory(int priority) {
this(true, priority);
}
/**
* Create a new instance.
*
* @param namePrefix for all created threads.
*/
public DefaultThreadFactory(String namePrefix) {
this(namePrefix, true, NORM_PRIORITY);
}
/**
* New instance.
*
* @param daemon {@code true} if the created threads should be daemons.
* @param priority for the created threads.
*/
public DefaultThreadFactory(boolean daemon, int priority) {
this(DEFAULT_NAME_PREFIX, daemon, priority);
}
/**
* New instance.
*
* @param namePrefix for all created threads.
* @param daemon {@code true} if the created threads should be daemons.
* @param priority for the created threads.
*/
public DefaultThreadFactory(String namePrefix, boolean daemon, int priority) {
this.namePrefix = requireNonNull(namePrefix) + '-' + factoryCount.incrementAndGet() + '-';
this.daemon = daemon;
this.priority = priority;
}
@Override
public Thread newThread(Runnable r) {
Thread t = new AsyncContextHolderThread(r, namePrefix + threadCount.incrementAndGet());
if (t.isDaemon() != daemon) {
t.setDaemon(daemon);
}
if (t.getPriority() != priority) {
t.setPriority(priority);
}
return t;
}
private static final class AsyncContextHolderThread extends Thread implements AsyncContextMapHolder {
@Nullable
private AsyncContextMap asyncContextMap;
AsyncContextHolderThread(Runnable target, String name) {
super(target, name);
}
@Override
public void asyncContextMap(@Nullable final AsyncContextMap asyncContextMap) {
this.asyncContextMap = asyncContextMap;
}
@Nullable
@Override
public AsyncContextMap asyncContextMap() {
return asyncContextMap;
}
}
}