/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.curator.utils;

import com.google.common.base.Throwables;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;

public class ThreadUtils
{
    private static final Logger log = LoggerFactory.getLogger(ThreadUtils.class);

    public static void checkInterrupted(Throwable e)
    {
        if ( e instanceof InterruptedException )
        {
            Thread.currentThread().interrupt();
        }
    }

    public static ExecutorService newSingleThreadExecutor(String processName)
    {
        return Executors.newSingleThreadExecutor(newThreadFactory(processName));
    }

    public static ExecutorService newFixedThreadPool(int qty, String processName)
    {
        return Executors.newFixedThreadPool(qty, newThreadFactory(processName));
    }

    public static ScheduledExecutorService newSingleThreadScheduledExecutor(String processName)
    {
        return Executors.newSingleThreadScheduledExecutor(newThreadFactory(processName));
    }

    public static ScheduledExecutorService newFixedThreadScheduledPool(int qty, String processName)
    {
        return Executors.newScheduledThreadPool(qty, newThreadFactory(processName));
    }

    public static ThreadFactory newThreadFactory(String processName)
    {
        return newGenericThreadFactory("Curator-" + processName);
    }

    public static ThreadFactory newGenericThreadFactory(String processName)
    {
        Thread.UncaughtExceptionHandler uncaughtExceptionHandler = new Thread.UncaughtExceptionHandler()
        {
            @Override
            public void uncaughtException(Thread t, Throwable e)
            {
                log.error("Unexpected exception in thread: " + t, e);
                Throwables.propagate(e);
            }
        };
        return new ThreadFactoryBuilder()
            .setNameFormat(processName + "-%d")
            .setDaemon(true)
            .setUncaughtExceptionHandler(uncaughtExceptionHandler)
            .build();
    }

    public static String getProcessName(Class<?> clazz)
    {
        if ( clazz.isAnonymousClass() )
        {
            return getProcessName(clazz.getEnclosingClass());
        }
        return clazz.getSimpleName();
    }
}
