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Why would people use ThreadPoolExecutor instead of direct function call?


Why would people use ThreadPoolExecutor instead of direct function call?

By : userarturo89
Date : January 12 2021, 09:11 PM
To fix this issue When you are reading things from a network, your application will probably spend most of its time waiting on a reply.
Normally, the Global Interpreter Lock inside CPython (the Python implementation you are probably using) ensures that only one thread at a time is executing Python bytecode.
code :


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Java ThreadPoolExecutor strategy, 'Direct Handoff' with queue?

Java ThreadPoolExecutor strategy, 'Direct Handoff' with queue?


By : ntitled
Date : March 29 2020, 07:55 AM
should help you out Note: these implementations are somewhat flawed and non-deterministic. Please read the entire answer and the comments before using this code.
How about creating a work queue that rejects items while the executor is below the maximum pool size, and starts accepting them once the maximum has been reached?
code :
public class ExecutorTest
{
    private static final int CORE_POOL_SIZE = 2;
    private static final int MAXIMUM_POOL_SIZE = 4;
    private static final int KEEP_ALIVE_TIME_MS = 5000;

    public static void main(String[] args)
    {
        final SaturateExecutorBlockingQueue workQueue = 
            new SaturateExecutorBlockingQueue();

        final ThreadPoolExecutor executor = 
            new ThreadPoolExecutor(CORE_POOL_SIZE, 
                    MAXIMUM_POOL_SIZE, 
                    KEEP_ALIVE_TIME_MS, 
                    TimeUnit.MILLISECONDS, 
                    workQueue);

        workQueue.setExecutor(executor);

        for (int i = 0; i < 6; i++)
        {
            final int index = i;
            executor.submit(new Runnable()
            {
                public void run()
                {
                    try
                    {
                        Thread.sleep(1000);
                    }
                    catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }

                    System.out.println("Runnable " + index 
                            + " on thread: " + Thread.currentThread());
                }
            });
        }
    }

    public static class SaturateExecutorBlockingQueue 
        extends LinkedBlockingQueue<Runnable>
    {
        private ThreadPoolExecutor executor;

        public void setExecutor(ThreadPoolExecutor executor)
        {
            this.executor = executor;
        }

        public boolean offer(Runnable e)
        {
            if (executor.getPoolSize() < executor.getMaximumPoolSize())
            {
                return false;
            }
            return super.offer(e);
        }
    }
}
public class ExecutorTest2
{
    private static final int KEEP_ALIVE_TIME_MS = 5000;
    private static final int CORE_POOL_SIZE = 2;
    private static final int MAXIMUM_POOL_SIZE = 4;

    public static void main(String[] args) throws InterruptedException
    {
        final SaturateExecutorBlockingQueue workQueue = 
            new SaturateExecutorBlockingQueue(CORE_POOL_SIZE, 
                    MAXIMUM_POOL_SIZE);

        final ThreadPoolExecutor executor = 
            new ThreadPoolExecutor(CORE_POOL_SIZE, 
                    MAXIMUM_POOL_SIZE, 
                    KEEP_ALIVE_TIME_MS, 
                    TimeUnit.MILLISECONDS, 
                    workQueue);

        workQueue.setExecutor(executor);

        for (int i = 0; i < 60; i++)
        {
            final int index = i;
            executor.submit(new Runnable()
            {
                public void run()
                {
                    try
                    {
                        Thread.sleep(1000);
                    }
                    catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }

                    System.out.println("Runnable " + index 
                            + " on thread: " + Thread.currentThread()
                            + " poolSize: " + executor.getPoolSize());
                }
            });
        }

        executor.shutdown();

        executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
    }

    public static class SaturateExecutorBlockingQueue 
        extends LinkedBlockingQueue<Runnable>
    {
        private final int corePoolSize;
        private final int maximumPoolSize;
        private ThreadPoolExecutor executor;

        public SaturateExecutorBlockingQueue(int corePoolSize, 
                int maximumPoolSize)
        {
            this.corePoolSize = corePoolSize;
            this.maximumPoolSize = maximumPoolSize;
        }

        public void setExecutor(ThreadPoolExecutor executor)
        {
            this.executor = executor;
        }

        public boolean offer(Runnable e)
        {
            if (super.offer(e) == false)
            {
                return false;
            }
            // Uncomment one or both of the below lines to increase
            // the likelyhood of the threadpool reusing an existing thread 
            // vs. spawning a new one.
            //Thread.yield();
            //Thread.sleep(0);
            int currentPoolSize = executor.getPoolSize();
            if (currentPoolSize < maximumPoolSize 
                    && currentPoolSize >= corePoolSize)
            {
                executor.setCorePoolSize(currentPoolSize + 1);
                executor.setCorePoolSize(corePoolSize);
            }
            return true;
        }
    }
}
what's the difference between direct function call and call() apply() in closure

what's the difference between direct function call and call() apply() in closure


By : Louis Cyphre
Date : March 29 2020, 07:55 AM
To fix this issue I read this snippet in the definitive guide:
code :
var result=f(arguments);
var result=f.apply(this,arguments);
function f(a,b,c) {
    // do something with a, b, c
    return c;
}
f([1,2,3]);
f(1,2,3);
Is this correct? ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) Executors.newFixedThreadPool(numThreads);

Is this correct? ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) Executors.newFixedThreadPool(numThreads);


By : 김성준
Date : March 29 2020, 07:55 AM
help you fix your problem Although I would normally agree with @Evgeniy for the reasons he has stated, it is actually OK in this specific case because the Javadoc for ThreadPoolExecutor specifically recommends using the factory methods for creating an instance.
I would consider this as a contractual obligation that these methods will return the expected ThreadPoolExecutor. I would not rely on looking at the source code, as that can change over time, but the explicit recommendation in the javadoc should be reliable.
Openssl thread-safety-callback-function registration with both direct call and indirect call

Openssl thread-safety-callback-function registration with both direct call and indirect call


By : eswar satya
Date : March 29 2020, 07:55 AM
help you fix your problem
it’s officially announced that Openssl isn’t thread-safe unless at least two callback functions are registered into Openssl:
How to find people with direct reports, without showing the direct reports in Active Directory?

How to find people with direct reports, without showing the direct reports in Active Directory?


By : Darta Nuww Pedidi
Date : March 29 2020, 07:55 AM
hope this fix your issue Here is an example of how I have done solved a similar problem to what you have described. I hope this helps.
code :
DirectorySearcher searcher;
SearchResultCollection results;

searcher = new DirectorySearcher();
searcher.Filter = "(&(objectClass=user)(objectCategory=person))";
searcher.PropertiesToLoad.Add("DirectReports");
searcher.PropertiesToLoad.Add("mail");
searcher.SearchRoot = utilityDomain;

Dictionary<string, string> managerEmailAddresses = new Dictionary<string, string>();

using (searcher)
{
    results = searcher.FindAll();

    foreach (SearchResult result in results)
    {
        if (result.Properties["DirectReports"].Count > 0)
        {
            DirectoryEntry emp = result.GetDirectoryEntry();

            String mail = "";
            if (emp.Properties["mail"].Count > 0)
            {
                mail = emp.Properties["mail"][0].ToString();
                string userName;
                userName= mail.Split('@')[0];

                managerEmailAddresses.Add(userName, mail);
             }
         }
    }
    return managerEmailAddresses;
}
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