org.danilopianini.concurrency

Class ThreadManager

java.lang.Object

org.danilopianini.concurrency.ThreadManager

public class ThreadManager
extends Object

A class to easy manage multithreaded applications. It contains two schedulers, one of them is meant to execute those Threads which run a task that will eventually return. Execution of these tasks is demanded to a FixedThreadPool whose dimension is the number of logic cores of the system. The other is meant to keep alive a bunch of services, and use a Chached thread pool.

Field Summary

Fields

Modifier and Type	Field and Description
private ExecutorService	cached The cached executor for services.
private ExecutorService	fixed The fixed executor for tasks.

Constructor Summary

Constructors

Constructor and Description
ThreadManager() Dfault constructor.
ThreadManager(int cores)

Method Summary

Modifier and Type	Method and Description
Future<?>	addService(AbstractService thread)
void	closeAndWait(long timeout) Shuts down all the services and tasks added.
<K> Future<K>	execute(Callable<K> thread)
void	execute(Object obj, String method, Object[] args) Deprecated.
Future<?>	execute(Runnable thread) This method will schedule a task for the execution in the FixedThreadPool.

Methods inherited from class java.lang.Object

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

Field Detail

cached

private final ExecutorService cached

The cached executor for services.

fixed

private final ExecutorService fixed

The fixed executor for tasks.

Constructor Detail

ThreadManager

public ThreadManager()

Dfault constructor. Tries to detect the number of threads to use for tasks automatically (counting the number of logic cores).

ThreadManager

public ThreadManager(int cores)

Parameters:

cores - the number of threads for the tasks executor.

Method Detail

addService

public Future<?> addService(AbstractService thread)

Parameters:

thread - The service to add to the CachedThreadPool

Returns:

a Future representing pending completion of the task

closeAndWait

public void closeAndWait(long timeout)

Shuts down all the services and tasks added. It waits for a maximum of timeout milliseconds before returning.

Parameters:

timeout - maximum time for this operation, in milliseconds.

execute

public <K> Future<K> execute(Callable<K> thread)

Type Parameters:

K - parameter type of the Future

Parameters:

thread - The Callable to schedule

Returns:

a Future representing pending completion of the task

execute

@Deprecated
public void execute(Object obj,
                                String method,
                                Object[] args)
                         throws NoSuchMethodException

Deprecated.

This method provides a facility to run methods in separate threads.

Parameters:

obj - the object within which invoke the method

method - the method to invoke

args - arguments for the method

Throws:

NoSuchMethodException - if the method does not exist

execute

public Future<?> execute(Runnable thread)

This method will schedule a task for the execution in the FixedThreadPool.

Parameters:

thread - The thread to schedule

Returns:

a Future representing pending completion of the task