public static void main(String[] args) throws Exception {
ExecutorService exec = Executors.newCachedThreadPool();
for (int i = 0; i < 5; i++) exec.execute(new Task());
exec.execute(new Task2());
Timer timer = new Timer();
timer.scheduleAtFixedRate(
new TimerTask() {
boolean prod = true;
public void run() {
if (prod) {
System.out.print("\nnotify() ");
Task.blocker.prod();
prod = false;
} else {
System.out.print("\nnotifyAll() ");
Task.blocker.prodAll();
prod = true;
}
}
},
400,
400); // Run every .4 second
TimeUnit.SECONDS.sleep(5); // Run for a while...
timer.cancel();
System.out.println("\nTimer canceled");
TimeUnit.MILLISECONDS.sleep(500);
System.out.print("Task2.blocker.prodAll() ");
Task2.blocker.prodAll();
TimeUnit.MILLISECONDS.sleep(500);
System.out.println("\nShutting down");
exec.shutdownNow(); // Interrupt all tasks
}
public static void main(String[] args) throws Exception {
Car car = new Car();
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new WaxOff(car));
exec.execute(new WaxOn(car));
TimeUnit.SECONDS.sleep(5); // Run for a while...
exec.shutdownNow(); // Interrupt all tasks
}
public static void main(String[] args) {
// Create a thread pool with two threads
ExecutorService executor = Executors.newFixedThreadPool(2);
System.out.println("Thread 1\t\tThread 2\t\tBalance");
executor.execute(new DepositTask());
executor.execute(new WithDrawTask());
executor.shutdown();
}
public static void main(String[] args) throws Exception {
ToastQueue dryQueue = new ToastQueue(),
butteredQueue = new ToastQueue(),
finishedQueue = new ToastQueue();
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new Toaster(dryQueue));
exec.execute(new Butterer(dryQueue, butteredQueue));
exec.execute(new Jammer(butteredQueue, finishedQueue));
exec.execute(new Eater(finishedQueue));
TimeUnit.SECONDS.sleep(5);
exec.shutdownNow();
}
public static void main(String[] args) throws Exception {
if (args.length > 0) size = new Integer(args[0]);
if (args.length > 1) delay = new Integer(args[1]);
ExecutorService exec = Executors.newCachedThreadPool();
Exchanger<List<Fat>> xc = new Exchanger<List<Fat>>();
List<Fat> producerList = new CopyOnWriteArrayList<Fat>(),
consumerList = new CopyOnWriteArrayList<Fat>();
exec.execute(new ExchangerProducer<Fat>(xc, BasicGenerator.create(Fat.class), producerList));
exec.execute(new ExchangerConsumer<Fat>(xc, consumerList));
TimeUnit.SECONDS.sleep(delay);
exec.shutdownNow();
}
public Restaurant(ExecutorService e, int nWaitPersons, int nChefs) {
exec = e;
for (int i = 0; i < nWaitPersons; i++) {
WaitPerson waitPerson = new WaitPerson(this);
waitPersons.add(waitPerson);
exec.execute(waitPerson);
}
for (int i = 0; i < nChefs; i++) {
Chef chef = new Chef(this);
chefs.add(chef);
exec.execute(chef);
}
}
public static void main(String[] args) throws Exception {
ExecutorService exec = Executors.newCachedThreadPool();
// If line is too long, customers will leave:
CustomerLine customers = new CustomerLine(MAX_LINE_SIZE);
exec.execute(new CustomerGenerator(customers));
// Manager will add and remove tellers as necessary:
exec.execute(new TellerManager(exec, customers, ADJUSTMENT_PERIOD));
if (args.length > 0) // Optional argument
TimeUnit.SECONDS.sleep(new Integer(args[0]));
else {
System.out.println("Press ‘Enter’ to quit");
System.in.read();
}
exec.shutdownNow();
}
public HorseRace(int nHorses, final int pause) {
/**
* 可以想CyclicBarrier提供一个"栅栏动作",他是一个Runnable,当计数值达到
* 0时候自动执行--这是CyclicBarrier和CountDownLatch之间的另一个区别,这 里,栅栏动作作为匿名内部类创建的,它被提交给了CyclicBarrier的构造器
*/
barrier =
new CyclicBarrier(
nHorses,
new Runnable() {
public void run() {
StringBuilder s = new StringBuilder();
for (int i = 0; i < FINISH_LINE; i++) s.append("="); // The fence on the racetrack
print(s);
for (Horse horse : horses) print(horse.tracks());
for (Horse horse : horses)
if (horse.getStrides() >= FINISH_LINE) {
print(horse + "won!");
exec.shutdownNow();
return;
}
try {
TimeUnit.MILLISECONDS.sleep(pause);
} catch (InterruptedException e) {
print("barrier-action sleep interrupted");
}
}
});
for (int i = 0; i < nHorses; i++) {
Horse horse = new Horse(barrier);
horses.add(horse);
exec.execute(horse);
}
}
public void adjustTellerNumber() {
// This is actually a control system. By adjusting
// the numbers, you can reveal stability issues in
// the control mechanism.
// If line is too long, add another teller:
if (customers.size() / workingTellers.size() > 2) {
// If tellers are on break or doing
// another job, bring one back:
if (tellersDoingOtherThings.size() > 0) {
Teller teller = tellersDoingOtherThings.remove();
teller.serveCustomerLine();
workingTellers.offer(teller);
return;
}
// Else create (hire) a new teller
Teller teller = new Teller(customers);
exec.execute(teller);
workingTellers.add(teller);
return;
}
// If line is short enough, remove a teller:
if (workingTellers.size() > 1 && customers.size() / workingTellers.size() < 2)
reassignOneTeller();
// If there is no line, we only need one teller:
if (customers.size() == 0) while (workingTellers.size() > 1) reassignOneTeller();
}
/**
* 将任务投入线程池执行
*
* @param worker
* @return
*/
public <T> FutureTask<T> execute(final Worker<T> worker) {
Callable<T> call =
new Callable<T>() {
@Override
public T call() throws Exception {
return postResult(worker, worker.doInBackground());
}
};
FutureTask<T> task =
new FutureTask<T>(call) {
@Override
protected void done() {
try {
get();
} catch (InterruptedException e) {
Log.e(TAG, e);
worker.abort();
postCancel(worker);
e.printStackTrace();
} catch (ExecutionException e) {
Log.e(TAG, e.getMessage());
e.printStackTrace();
throw new RuntimeException(
"An error occured while executing doInBackground()", e.getCause());
} catch (CancellationException e) {
worker.abort();
postCancel(worker);
Log.e(TAG, e);
e.printStackTrace();
}
}
};
threadPool.execute(task);
return task;
}
/**
* Executes the specified runnable on the worker thread of the view. Execution is performed
* sequentially in the same sequence as the runnables have been passed to this method.
*/
@Override
public void execute(Runnable worker) {
if (executor == null) {
executor = Executors.newSingleThreadExecutor();
}
executor.execute(worker);
}
/**
* Submits a value-returning task for execution and returns a Future representing the pending
* results of the task. Upon completion, this task may be taken or polled.
*
* @param task the task to submit
* @return a future to watch the task
*/
public <V> Future<V> submit(Callable<V> task) {
Preconditions.checkState(isOpen.get(), "CloseableExecutorService is closed");
InternalFutureTask<V> futureTask = new InternalFutureTask<V>(new FutureTask<V>(task));
executorService.execute(futureTask);
return futureTask;
}
/** {@inheritDoc} */
@Override
protected void maybeStartStream() throws IOException {
// connector
final StreamConnector connector = getStreamConnector();
if (connector == null) return;
synchronized (this) {
if (started) return;
threadPool.execute(
new Runnable() {
@Override
public void run() {
try {
Sctp.init();
runOnDtlsTransport(connector);
} catch (IOException e) {
logger.error(e, e);
} finally {
try {
Sctp.finish();
} catch (IOException e) {
logger.error("Failed to shutdown SCTP stack", e);
}
}
}
});
started = true;
}
}
public void start() throws InterruptedException {
barrier = new CyclicBarrier(numberOfCars, this);
for (int i = 0; i < numberOfCars; i++) {
pool.execute(new Car("Car" + i, 100 + random.nextInt(100), this));
}
pool.awaitTermination(300, TimeUnit.MILLISECONDS);
}
public static void test(IntGenerator go, int count) {
System.out.println("Press Control-C to exit");
ExecutorService exec = Executors.newCachedThreadPool();
for (int i = 0; i < count; i++) {
exec.execute(new EventChecker(go, i));
}
exec.shutdown();
}
/**
* Submits a Runnable task for execution and returns a Future representing that task. Upon
* completion, this task may be taken or polled.
*
* @param task the task to submit
* @return a future to watch the task
*/
public Future<?> submit(Runnable task) {
Preconditions.checkState(isOpen.get(), "CloseableExecutorService is closed");
InternalFutureTask<Void> futureTask =
new InternalFutureTask<Void>(new FutureTask<Void>(task, null));
executorService.execute(futureTask);
return futureTask;
}
public static void main(String[] args) throws Exception {
ExecutorService exec = Executors.newCachedThreadPool();
for (int i = 0; i < N_ELEMENTS; i++)
for (int j = 0; j < N_GENES; j++) GRID[i][j] = new AtomicInteger(rand.nextInt(1000));
for (int i = 0; i < N_EVOLVERS; i++) exec.execute(new Evolver());
TimeUnit.SECONDS.sleep(5);
exec.shutdownNow();
}
/** Demonstrating the failing of the pre/post conditions of Even. */
public static void main(String[] args) {
ExecutorService e = Executors.newFixedThreadPool(10);
Even ev = new Even();
for (int i = 0; i < 10; i++) {
e.execute(new EvenTask(ev));
}
e.shutdown();
}
@Override
public Future<Boolean> connect(final String clientId) throws Exception {
if (isConnected()) {
throw new Exception("You are already connected");
}
// keep track of the original one, so we can detect change
this.originalClientId = clientId;
// this will help us do the connect synchronously
connectLatch = new CountDownLatch(1);
final Future connectFuture = connection.connect();
FutureTask<Boolean> asdf =
new FutureTask<Boolean>(
new Callable<Boolean>() {
@Override
public Boolean call() {
// TODO: notify callers somehow?
try {
connectFuture.get(45, TimeUnit.SECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (TimeoutException e) {
e.printStackTrace();
}
if (connection.isConnected()) {
connection.send(new ConnectCommand(clientId));
// block while the signal server is thinking/hanging.
try {
connectLatch.await(45, TimeUnit.SECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
final boolean result = isConnected();
// queue it up, or else the "connect()" call will still block while the slow-ass
// observers fire.
connectEvent.notifyObservers(this, result);
return result;
}
});
// this background thread stops us from blocking.
executor.execute(asdf);
return asdf;
}
public static void start() {
if (started) return;
// start code
pool = Executors.newFixedThreadPool(poolSize);
System.out.println("downloader start!!");
for (DownloadTask task : tasks) pool.execute(task);
started = true;
}
@Override
public void execute(Runnable command) {
if (command == null) {
// TODO logger
return;
}
executorService.execute(command);
}
public static void main(String[] args) {
try {
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new ExceptionThread());
} catch (RuntimeException ue) {
// This statement will NOT execute!
System.out.println("Exception has been handled!");
}
}
public TellerManager(ExecutorService e, CustomerLine customers, int adjustmentPeriod) {
exec = e;
this.customers = customers;
this.adjustmentPeriod = adjustmentPeriod;
// Start with a single teller:
Teller teller = new Teller(customers);
exec.execute(teller);
workingTellers.add(teller);
}
/**
* Testing threads thoroughly seems to be a lot of fun, I am not sure yet how to properly do that.
* This test tests priority order and total sum received is equal to total sum sent. It also
* simulates clients random hanging.
*/
@Test
public void testReceiveData() {
DecorateCheckOrderAndCountSumMarshaller sumAppender =
new DecorateCheckOrderAndCountSumMarshaller();
QueueWorker worker = new QueueWorker(sumAppender);
Thread workerThread = new Thread(worker);
// run 20 clients, 10.000 items will be generated per client as defined in
// src/test/properties/app.properties
for (int i = 0; i < 20; i++) {
Runnable clientHangSimulator = null;
if (i % 5 == 0) {
// simulate occasional client hang for four of the total twenty clients and check worker is
// not biased.
clientHangSimulator =
() -> {
if (ThreadLocalRandom.current().nextInt(1001) % 1000 == 0) {
try {
Thread.sleep(500L);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
};
}
executorService.execute(new DataGeneratorTask(clientHangSimulator));
}
workerThread.start();
try {
barrier.await();
System.out.println("Fired test");
Thread.sleep(1000);
executorService.shutdown();
// runs actually much faster, may need update if item count per client is drastically
// increased in app.properties
executorService.awaitTermination(2 * 60, TimeUnit.SECONDS);
System.out.println("exe service awaited");
} catch (InterruptedException | BrokenBarrierException e) {
e.printStackTrace();
}
try {
workerThread.join(Long.MAX_VALUE);
} catch (InterruptedException e) {
e.printStackTrace();
}
Assert.assertEquals(
"Sum generated does not match sum received",
sumAppender.getSum(),
AppContext.getInstance().getTotalGeneratedAmount());
Assert.assertFalse("Worker didn't exit successfully", workerThread.isAlive());
}
/*
Use this version for fire and forget style messaging.
*/
public void sendOneWay(Message message, EndPoint to) {
// do local deliveries
if (message.getFrom().equals(to)) {
MessagingService.receive(message);
return;
}
Runnable tcpWriteEvent = new MessageSerializationTask(message, to);
messageSerializerExecutor_.execute(tcpWriteEvent);
}
public static void main(String[] args) {
Random rand = new Random(47);
ExecutorService exec = Executors.newCachedThreadPool();
DelayQueue<DelayedTask> queue = new DelayQueue<DelayedTask>();
// Fill with tasks that have random delays:
for (int i = 0; i < 20; i++) queue.put(new DelayedTask(rand.nextInt(5000)));
// Set the stopping point
queue.add(new DelayedTask.EndSentinel(5000, exec));
exec.execute(new DelayedTaskConsumer(queue));
}
protected <T> T timedCall(Callable<T> c, long timeout, TimeUnit timeUnit)
throws InterruptedException, ExecutionException, TimeoutException {
FutureTask<T> task = new FutureTask<T>(c);
try {
THREAD_POOL.execute(task);
return task.get(timeout, timeUnit);
} finally {
task.cancel(true);
}
}
public void serve() {
try {
serverTransport_.listen();
} catch (TTransportException ttx) {
LOGGER.error("Error occurred during listening.", ttx);
return;
}
stopped_ = false;
while (!stopped_) {
int failureCount = 0;
try {
TTransport client = serverTransport_.accept();
WorkerProcess wp = new WorkerProcess(client);
try {
executorService_.execute(wp);
} catch (RejectedExecutionException ree) {
++failureCount;
LOGGER.warn("Execution rejected.", ree);
client.close();
}
} catch (TTransportException ttx) {
if (!stopped_) {
++failureCount;
LOGGER.warn("Transport error occurred during acceptance of message.", ttx);
}
} catch (Error e) {
if (!stopped_) {
++failureCount;
LOGGER.warn("Uncaught error.", e);
}
}
}
executorService_.shutdown();
// Loop until awaitTermination finally does return without a interrupted
// exception. If we don't do this, then we'll shut down prematurely. We want
// to let the executorService clear it's task queue, closing client sockets
// appropriately.
long timeoutMS = options_.stopTimeoutUnit.toMillis(options_.stopTimeoutVal);
long now = System.currentTimeMillis();
while (timeoutMS >= 0) {
try {
executorService_.awaitTermination(timeoutMS, TimeUnit.MILLISECONDS);
break;
} catch (InterruptedException ix) {
long newnow = System.currentTimeMillis();
timeoutMS -= (newnow - now);
now = newnow;
}
}
}
public static void main(String[] args) throws Exception {
ExecutorService exec = Executors.newCachedThreadPool();
Restaurant restaurant = new Restaurant(exec, 5, 2);
exec.execute(restaurant);
if (args.length > 0) // Optional argument
TimeUnit.SECONDS.sleep(new Integer(args[0]));
else {
print("Press ‘Enter’ to quit");
System.in.read();
}
exec.shutdownNow();
}
public static void main(String[] args) {
ExecutorService exec = Executors.newCachedThreadPool();
AtomicityTest at = new AtomicityTest();
exec.execute(at);
while (true) {
int val = at.getValue();
if (val % 2 != 0) {
System.out.println(val);
System.exit(0);
}
}
}