syncmap | typed implementation of the Go sync | Generator Utils library

I am using an ExecutorService fixedThreadPool() to run a TASK.

A TASK here is defined as downloading a file from a specific URL and saving it to the database if it doesn't exist or else read the file from the database only. So it's more like a reader-writer problem where any of the thread of executor thread pool can act as a writer for once and others will be a reader for the subsequent request.

I am using Semaphore to perform this but the issue with this approach is subsequent read requests are happening sequentially.

If 4 TASKs are intended to hit the same URL I needed the synchronization till the file is downloaded and the semaphore is released i.e. out of 4 threads anyone can acquire the lock and rest 3 are waiting. After the download completes all the remaining 3 threads should simultaneously read the downloaded file. But this last step is happening sequentially in my case which will have an impact on project performance as well.

Having said the above use case, the following is my sample code:

Following Runnable is passed to ExecutorService to execute the task on the SharedObject class.