Package no.digipost

Class DiggConcurrent

java.lang.Object

no.digipost.DiggConcurrent

public class DiggConcurrent
extends Object

Method Summary

Modifier and Type	Method	Description
static void	ensureShutdown(String executorName, ExecutorService executor, Duration timeoutBeforeForcefulShutdown)	Perform an orderly shutdown, trying to wait for any currently running tasks to finish, or else forcefully shutdown the executor if the tasks are not able to finish their work within the given timeout duration.
static void	ensureShutdown(ExecutorService executor, Duration timeoutBeforeForcefulShutdown)	Perform an orderly shutdown, trying to wait for any currently running tasks to finish, or else forcefully shutdown the executor if the tasks are not able to finish their work within the given timeout duration.
static ExecutorService	externallyManaged(ExecutorService executor)	Wraps another ExecutorService as an "externally managed executor service", which will discard any invocations of the methods used to manage the lifecycle of the ExecutorService itself.
static ExecutorService	fixedThreadPool(int threadAmount, String name)
static boolean	isExternallyManaged(ExecutorService executor)	Determine if the given ExecutorService is marked as externally managed.
static ScheduledExecutorService	scheduled(int threadAmount, String name)
static ScheduledExecutorService	scheduledSingleThreaded(String name)
static ExecutorService	singleThreaded(String name)
static ThreadFactory	threadNamingFactory(String threadBaseName)	Create a thread factory based on Executors.defaultThreadFactory(), but naming the created threads using the given threadBaseName and an incrementing number for each thread created by the factory.
static ThreadFactory	threadNamingFactory(LongFunction<String> threadName)	Create a thread factory based on Executors.defaultThreadFactory(), but naming the created threads using the result of the given given long -> String function, which argument is the number of the created thread.
static ThreadFactory	threadNamingFactory(LongFunction<String> threadName, ThreadFactory backingFactory)	Create a thread factory delegating to the given backingFactory for creating new threads, but naming the created threads using the result of the given given long -> String function, which argument is the number of the created thread.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

fixedThreadPool

public static ExecutorService fixedThreadPool(int threadAmount,
                                              String name)

singleThreaded

public static ExecutorService singleThreaded(String name)

scheduledSingleThreaded

public static ScheduledExecutorService scheduledSingleThreaded(String name)

scheduled

public static ScheduledExecutorService scheduled(int threadAmount,
                                                 String name)

threadNamingFactory

public static ThreadFactory threadNamingFactory(String threadBaseName)

Create a thread factory based on Executors.defaultThreadFactory(), but naming the created threads using the given threadBaseName and an incrementing number for each thread created by the factory. The threads will have names on the form threadBaseName-N.

Parameters:

threadBaseName - the base name for threads created by the factory.

threadNamingFactory

public static ThreadFactory threadNamingFactory(LongFunction<String> threadName)

Create a thread factory based on Executors.defaultThreadFactory(), but naming the created threads using the result of the given given long -> String function, which argument is the number of the created thread.

Parameters:

threadName - function used for naming each thread created by the factory.

threadNamingFactory

public static ThreadFactory threadNamingFactory(LongFunction<String> threadName,
                                                ThreadFactory backingFactory)

Create a thread factory delegating to the given backingFactory for creating new threads, but naming the created threads using the result of the given given long -> String function, which argument is the number of the created thread.

Parameters:

threadName - function used for naming each thread created by the factory.

backingFactory - the factory used for creating new threads.

externallyManaged

public static ExecutorService externallyManaged(ExecutorService executor)

Wraps another ExecutorService as an "externally managed executor service", which will discard any invocations of the methods used to manage the lifecycle of the ExecutorService itself. This includes the methods:

• ExecutorService.shutdown()
• ExecutorService.shutdownNow() (returns empty list)
• ExecutorService.awaitTermination(long, TimeUnit) (immediately returns with the result of ExecutorService.isTerminated())

An externally managed executor will not be attempted shut down by ensureShutdown(ExecutorService, Duration).

isExternallyManaged

public static boolean isExternallyManaged(ExecutorService executor)

Determine if the given ExecutorService is marked as externally managed.

ensureShutdown

public static void ensureShutdown(ExecutorService executor,
                                  Duration timeoutBeforeForcefulShutdown)

Perform an orderly shutdown, trying to wait for any currently running tasks to finish, or else forcefully shutdown the executor if the tasks are not able to finish their work within the given timeout duration. The ensureShutdown(String, ExecutorService, Duration) method is preferred over this.

Parameters:

executor - the ExecutorService to shut down.

timeoutBeforeForcefulShutdown - the maximum amount of time to wait for tasks to finish before forcefully shutting down the executor.

ensureShutdown

public static void ensureShutdown(String executorName,
                                  ExecutorService executor,
                                  Duration timeoutBeforeForcefulShutdown)

Perform an orderly shutdown, trying to wait for any currently running tasks to finish, or else forcefully shutdown the executor if the tasks are not able to finish their work within the given timeout duration.

Parameters:

executorName - a descriptive name of the executor to shut down, used for logging.

executor - the ExecutorService to shut down.

timeoutBeforeForcefulShutdown - the maximum amount of time to wait for tasks to finish before forcefully shutting down the executor.