/*
 * Copyright 2015 MongoDB, Inc.
 *
 * 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 com.mongodb.internal.thread;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Custom thread factory for scheduled executor service that creates daemon threads.  Otherwise,
 * applications that neglect to close the client will not exit.
 *
 * <p>This class should not be considered a part of the public API.</p>
 */
public class DaemonThreadFactory implements ThreadFactory {
    private static final AtomicInteger POOL_NUMBER = new AtomicInteger(1);
    private final AtomicInteger threadNumber = new AtomicInteger(1);
    private final String namePrefix;

    public DaemonThreadFactory() {
        this("pool");
    }

    public DaemonThreadFactory(final String prefix) {
        namePrefix = prefix + "-" + POOL_NUMBER.getAndIncrement() + "-thread-";
    }

    @Override
    public Thread newThread(final Runnable runnable) {
        Thread t = new Thread(runnable, namePrefix + threadNumber.getAndIncrement());
        t.setDaemon(true);
        return t;
    }
}
