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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2021 Bell Canada. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.core.infrastructure.threading;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import lombok.Getter;
/**
* This class provides a thread factory for use by classes that require thread factories to handle concurrent operation.
*
* @author Sajeevan Achuthan (sajeevan.achuthan@ericsson.com)
*/
public class ApplicationThreadFactory implements ThreadFactory {
private static final String HYPHEN = "-";
private static final String APPLICATION_NAME = "Apex-";
private static final AtomicInteger NEXT_POOL_NUMBER = new AtomicInteger();
private final ThreadGroup group;
private final AtomicInteger nextThreadNumber = new AtomicInteger();
@Getter
private final String name;
@Getter
private final long stackSize;
@Getter
private final int threadPriority;
/**
* Instantiates a new application thread factory with a default stack size and normal thread priority.
*
* @param nameLocal the name local
*/
public ApplicationThreadFactory(final String nameLocal) {
this(nameLocal, 0);
}
/**
* Instantiates a new application thread factory with a default normal thread priority.
*
* @param nameLocal the name local
* @param stackSize the stack size
*/
public ApplicationThreadFactory(final String nameLocal, final long stackSize) {
this(nameLocal, stackSize, Thread.NORM_PRIORITY);
}
/**
* Instantiates a new application thread factory with a specified thread priority.
*
* @param nameLocal the name local
* @param stackSize the stack size
* @param threadPriority the thread priority
*/
public ApplicationThreadFactory(final String nameLocal, final long stackSize, final int threadPriority) {
final var s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
name = APPLICATION_NAME + nameLocal + HYPHEN + NEXT_POOL_NUMBER.getAndIncrement();
this.stackSize = stackSize;
this.threadPriority = threadPriority;
}
/**
* {@inheritDoc}.
*/
@Override
public Thread newThread(final Runnable runnable) {
final Thread thisThread;
if (stackSize > 0) {
thisThread = new Thread(group, runnable, name + ':' + nextThreadNumber.getAndIncrement(), stackSize);
} else {
thisThread = new Thread(group, runnable, name + ':' + nextThreadNumber.getAndIncrement());
}
if (thisThread.isDaemon()) {
thisThread.setDaemon(false);
}
thisThread.setPriority(threadPriority);
return thisThread;
}
/**
* Stop group threads.
*/
public void stopGroupThreads() {
group.interrupt();
group.list();
}
/**
* {@inheritDoc}.
*/
@Override
public String toString() {
return "ApplicationThreadFactory [nextPoolNumber=" + NEXT_POOL_NUMBER + ",nextThreadNumber=" + nextThreadNumber
+ ", name=" + name + ", stackSize=" + stackSize + ", threadPriority=" + threadPriority + "]";
}
}
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