Java Utililty Methods Thread Executor

List of utility methods to do Thread Executor

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Thread Executor

Description

The list of methods to do Thread Executor are organized into topic(s).

Method

void addExecutorShutdownHook(final ExecutorService exec)
add Executor Shutdown Hook

addExecutorShutdownHook(exec, 60, TimeUnit.SECONDS);

void addThread(Runnable runnable)
add Thread

service.execute(runnable);

Callable convert(Runnable runnable, T result)
Converts the specified Runnable to a Callable returning the specified result.

return () -> {
 runnable.run();
 return result;
};

int getActiveHelperInstanceCount(String helperName)
get Active Helper Instance Count

return ((ThreadPoolExecutor) executorServiceMap.get(helperName)).getActiveCount();

ExecutorService getChannelService()
get Channel Service

return CHANNEL_SERVICE;

Map getConstantLookup()
get Constant Lookup

Map<String, String> toRet = new HashMap<>();
toRet.put("java.util.concurrent.BlockingDeque", "BLOCKING_DEQUE");
toRet.put("java.util.concurrent.BlockingQueue", "BLOCKING_QUEUE");
toRet.put("java.util.concurrent.Callable", "CALLABLE");
toRet.put("java.util.concurrent.CompletionService", "COMPLETION_SERVICE");
toRet.put("java.util.concurrent.ConcurrentMap", "CONCURRENT_MAP");
toRet.put("java.util.concurrent.ConcurrentNavigableMap", "CONCURRENT_NAVIGABLE_MAP");
toRet.put("java.util.concurrent.Delayed", "DELAYED");
...

ExecutorService getThreadExecutor(int nThreads)
get Thread Executor

return Executors.newFixedThreadPool(nThreads);

boolean isCorrectCollectionSizeTimeOut(Collection collection, int size, long timeout, TimeUnit unit)
Check size of a collection populated in another thread.

Runnable task = () -> {
 try {
 while (collection.size() != size) {
 TimeUnit.MILLISECONDS.sleep(10);
 } catch (InterruptedException e) {
 throw new IllegalStateException("task interrupted", e);
};
ExecutorService executor = Executors.newSingleThreadExecutor();
executor.submit(task);
executor.shutdown();
return executor.awaitTermination(timeout, unit);

boolean isRegularlyDone(Future future)
Checks if the specified Future terminated regularly, e.g.

try {
 future.get();
} catch (InterruptedException | ExecutionException e) {
 return false;
return true;

boolean isShutdown(Executor executor)
is Shutdown

if (executor instanceof ExecutorService) {
 if (((ExecutorService) executor).isShutdown()) {
 return true;
return false;