java.util.concurrent.Semaphore.<init>()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中java.util.concurrent.Semaphore.<init>()方法的一些代码示例，展示了Semaphore.<init>()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Semaphore.<init>()方法的具体详情如下：
包路径：java.util.concurrent.Semaphore
类名称：Semaphore
方法名：<init>

Semaphore.<init>介绍

[英]Creates a Semaphore with the given number of permits and nonfair fairness setting.
[中]创建具有给定许可数和非空中公平设置的信号量。

代码示例

代码示例来源：origin: redisson/redisson

public void waitForFinish() throws InterruptedException {
  final Semaphore sem = new Semaphore(0);
  orderedPool.execute(new Runnable() {
    @Override
    public void run() {
      sem.release();
    }
  });
  sem.acquire();
}

代码示例来源：origin: Red5/red5-server

/** {@inheritDoc} */
@Override
public boolean start(IScope scope) {
  if (lock == null) {
    lock = new Semaphore(1, true);
  }
  try {
    lock.tryAcquire(1, TimeUnit.SECONDS);
    return super.start(scope);
  } catch (InterruptedException e) {
    e.printStackTrace();
  } finally {
    lock.release();
  }
  return false;
}

代码示例来源：origin: stackoverflow.com

public class BoundedExecutor {
  private final Executor exec;
  private final Semaphore semaphore;

  public BoundedExecutor(Executor exec, int bound) {
    this.exec = exec;
    this.semaphore = new Semaphore(bound);
  }

  public void submitTask(final Runnable command)
      throws InterruptedException, RejectedExecutionException {
    semaphore.acquire();
    try {
      exec.execute(new Runnable() {
        public void run() {
          try {
            command.run();
          } finally {
            semaphore.release();
          }
        }
      });
    } catch (RejectedExecutionException e) {
      semaphore.release();
      throw e;
    }
  }
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testRunningJobIsInterruptedAfterShutdownNow() throws InterruptedException {
 BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 ExecutorService service = Executors.newSingleThreadExecutor();
 try {
  PartitionedOrderedExecutor executor = new PartitionedOrderedExecutor(queue, service);
  final Semaphore jobSemaphore = new Semaphore(0);
  final Semaphore testSemaphore = new Semaphore(0);
  final AtomicBoolean interrupted = new AtomicBoolean();
  executor.submit(() -> {
   testSemaphore.release();
   try {
    jobSemaphore.acquire();
   } catch (InterruptedException e) {
    interrupted.set(true);
   }
  });
  testSemaphore.acquireUninterruptibly();
  assertThat(executor.shutdownNow(), empty());
  assertThat(executor.awaitTermination(2, MINUTES), is(true));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(true));
  assertThat(jobSemaphore.availablePermits(), is(0));
  assertThat(interrupted.get(), is(true));
 } finally {
  service.shutdown();
 }
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testFaultsDoNotGetToEvictionAdvisor() throws StoreAccessException {
 final Semaphore semaphore = new Semaphore(0);
 final OnHeapStoreForTests<String, String> store = newStore(SystemTimeSource.INSTANCE, noAdvice());
 ExecutorService executor = Executors.newCachedThreadPool();
 try {
  executor.submit(() -> store.getOrComputeIfAbsent("prime", key -> {
   semaphore.acquireUninterruptibly();
   return new OnHeapValueHolder<String>(0, 0, false) {
    @Override
    public String get() {
     return key;
    }
   };
  }));
  while (!semaphore.hasQueuedThreads());
  store.put("boom", "boom");
 } finally {
  semaphore.release(1);
  executor.shutdown();
 }
}

代码示例来源：origin: stackoverflow.com

private static Semaphore semaphore = new Semaphore(1024 * 1024, true);
  semaphore.acquire(size);
  semaphore.release(array.length);

代码示例来源：origin: LeonardoZ/java-concurrency-patterns

public static void main(String[] args) {
    ExecutorService executor = Executors.newCachedThreadPool();
    Semaphore semaphore = new Semaphore(3);

    Runnable r = () -> {
      try {
        System.out.println("Trying to acquire - " + Thread.currentThread().getName());
        if (semaphore.tryAcquire(2, TimeUnit.SECONDS)) {
          // use-get resource
          // simulate work in progress
          System.out.println("Acquired - " + Thread.currentThread().getName());
          Thread.sleep(2000);
          System.out.println("Done - " + Thread.currentThread().getName());
        }
      } catch (InterruptedException e) {
        e.printStackTrace();
      } finally {
        semaphore.release();
      }
    };
    for (int i = 0; i < 4; i++) {
      executor.execute(r);
    }
    
    executor.shutdown();

  }
}

代码示例来源：origin: RuedigerMoeller/fast-serialization

public void waitForFinish() throws InterruptedException {
  final Semaphore sem = new Semaphore(0);
  orderedPool.execute(new Runnable() {
    @Override
    public void run() {
      sem.release();
    }
  });
  sem.acquire();
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testRunningJobIsInterruptedAfterShutdownNow() throws InterruptedException {
 BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 ExecutorService service = Executors.newSingleThreadExecutor();
 try {
  PartitionedUnorderedExecutor executor = new PartitionedUnorderedExecutor(queue, service, 1);
  final Semaphore jobSemaphore = new Semaphore(0);
  final Semaphore testSemaphore = new Semaphore(0);
  final AtomicBoolean interrupted = new AtomicBoolean();
  executor.submit(() -> {
   testSemaphore.release();
   try {
    jobSemaphore.acquire();
   } catch (InterruptedException e) {
    interrupted.set(true);
   }
  });
  testSemaphore.acquireUninterruptibly();
  assertThat(executor.shutdownNow(), empty());
  assertThat(executor.awaitTermination(2, MINUTES), is(true));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(true));
  assertThat(jobSemaphore.availablePermits(), is(0));
  assertThat(interrupted.get(), is(true));
 } finally {
  service.shutdown();
 }
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testQueuedJobIsStoppedAfterShutdownNow() throws InterruptedException {
 BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 ExecutorService service = Executors.newSingleThreadExecutor();
 try {
  PartitionedUnorderedExecutor executor = new PartitionedUnorderedExecutor(queue, service, 1);
  final Semaphore jobSemaphore = new Semaphore(0);
  final Semaphore testSemaphore = new Semaphore(0);
  executor.submit(() -> {
   testSemaphore.release();
   jobSemaphore.acquireUninterruptibly();
  });
  final AtomicBoolean called = new AtomicBoolean();
  executor.submit(() -> called.set(true));
  testSemaphore.acquireUninterruptibly();
  assertThat(executor.shutdownNow(), hasSize(1));
  assertThat(executor.awaitTermination(100, MILLISECONDS), is(false));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(false));
  jobSemaphore.release();
  assertThat(executor.awaitTermination(2, MINUTES), is(true));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(true));
  assertThat(jobSemaphore.availablePermits(), is(0));
  assertThat(called.get(), is(false));
 } finally {
  service.shutdown();
 }
}

代码示例来源：origin: jenkinsci/jenkins

mutexByTool.put(tool, semaphore = new Semaphore(1));
semaphore.acquire();
try {
  return installer.performInstallation(tool, node, log).getRemote();
} finally {
  semaphore.release();

代码示例来源：origin: apache/flume

memQueRemaining = new Semaphore(newMemoryCapacity);
} else {
 int diff = newMemoryCapacity - memoryCapacity;
 memQueRemaining.release(diff);

代码示例来源：origin: apache/storm

public void feed(Object tuples) {
  Semaphore sem = new Semaphore(0);
  ((List) RegisteredGlobalState.getState(_semaphoreId)).add(sem);
  ((List) RegisteredGlobalState.getState(_id)).add(tuples);
  try {
    sem.acquire();
  } catch (InterruptedException e) {
    throw new RuntimeException(e);
  }
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testRunningJobIsInterruptedAfterShutdownNow() throws InterruptedException {
 ExecutorService worker = Executors.newSingleThreadExecutor();
 try {
  PartitionedScheduledExecutor executor = new PartitionedScheduledExecutor(scheduler, worker);
  final Semaphore jobSemaphore = new Semaphore(0);
  final Semaphore testSemaphore = new Semaphore(0);
  final AtomicBoolean interrupted = new AtomicBoolean();
  executor.submit(() -> {
   testSemaphore.release();
   try {
    jobSemaphore.acquire();
   } catch (InterruptedException e) {
    interrupted.set(true);
   }
  });
  testSemaphore.acquireUninterruptibly();
  assertThat(executor.shutdownNow(), empty());
  assertThat(executor.awaitTermination(2, MINUTES), is(true));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(true));
  assertThat(jobSemaphore.availablePermits(), is(0));
  assertThat(interrupted.get(), is(true));
 } finally {
  worker.shutdown();
 }
}

代码示例来源：origin: ehcache/ehcache3

@Test
public void testQueuedJobIsStoppedAfterShutdownNow() throws InterruptedException {
 ExecutorService worker = Executors.newSingleThreadExecutor();
 try {
  PartitionedScheduledExecutor executor = new PartitionedScheduledExecutor(scheduler, worker);
  final Semaphore jobSemaphore = new Semaphore(0);
  final Semaphore testSemaphore = new Semaphore(0);
  executor.submit(() -> {
   testSemaphore.release();
   jobSemaphore.acquireUninterruptibly();
  });
  final AtomicBoolean called = new AtomicBoolean();
  executor.submit(() -> called.set(true));
  testSemaphore.acquireUninterruptibly();
  assertThat(executor.shutdownNow(), hasSize(1));
  assertThat(executor.awaitTermination(100, MILLISECONDS), is(false));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(false));
  jobSemaphore.release();
  assertThat(executor.awaitTermination(2, MINUTES), is(true));
  assertThat(executor.isShutdown(), is(true));
  assertThat(executor.isTerminated(), is(true));
  assertThat(jobSemaphore.availablePermits(), is(0));
  assertThat(called.get(), is(false));
 } finally {
  worker.shutdown();
 }
}

代码示例来源：origin: Netflix/concurrency-limits

public void run(int iterations, int limit, Executor executor, Supplier<Long> latency) {
  AtomicInteger requests = new AtomicInteger();
  AtomicInteger busy = new AtomicInteger();
  
  AtomicInteger counter = new AtomicInteger();
  Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(() -> {
    System.out.println("" + counter.incrementAndGet() + " total=" + requests.getAndSet(0) + " busy=" + busy.get());
  }, 1, 1, TimeUnit.SECONDS);
  Semaphore sem = new Semaphore(limit, true);
  for (int i = 0; i < iterations; i++) {
    requests.incrementAndGet();
    busy.incrementAndGet();
    executor.execute(() -> {
      try {
        sem.acquire();
        TimeUnit.MILLISECONDS.sleep(latency.get()); 
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
      } finally {
        sem.release();
        busy.decrementAndGet();
      }
    });
  }
}

代码示例来源：origin: stackoverflow.com

private Semaphore terminations = new Semaphore(0);

protected void beforeExecute (final Thread thread, final Runnable job) {
  if (terminations.tryAcquire()) {
    /* Replace this item in the queue so it may be executed by another
     * thread
     */
    queue.add(job);

    thread.setUncaughtExceptionHandler(
      new ShutdownHandler(thread.getUncaughtExceptionHandler())
      );

    /* Throwing a runtime exception is the only way to prematurely
     * cause a worker thread from the TheadPoolExecutor to exit.
     */
    throw new ShutdownException("Terminating thread");
  }
}

public void setCorePoolSize (final int size) {
  int delta = getActiveCount() - size;

  super.setCorePoolSize(size);

  if (delta > 0) {
    terminations.release(delta);
  }
}

代码示例来源：origin: alibaba/jstorm

public void feed(Object tuples) {
  Semaphore sem = new Semaphore(0);
  ((List) RegisteredGlobalState.getState(_semaphoreId)).add(sem);
  ((List) RegisteredGlobalState.getState(_id)).add(tuples);
  try {
    sem.acquire();
  } catch (InterruptedException e) {
    throw new RuntimeException(e);
  }
}

代码示例来源：origin: ehcache/ehcache3

PartitionedUnorderedExecutor executor = new PartitionedUnorderedExecutor(queue, service, jobCount);
final Semaphore jobSemaphore = new Semaphore(0);
final Semaphore testSemaphore = new Semaphore(0);
final AtomicInteger interrupted = new AtomicInteger();
  testSemaphore.release();
  try {
   jobSemaphore.acquire();
  } catch (InterruptedException e) {
   interrupted.incrementAndGet();

代码示例来源：origin: ehcache/ehcache3

PartitionedOrderedExecutor executor = new PartitionedOrderedExecutor(queue, service);
final Semaphore jobSemaphore = new Semaphore(0);
final Semaphore testSemaphore = new Semaphore(0);
 testSemaphore.release();
 jobSemaphore.acquireUninterruptibly();
});
assertThat(executor.isTerminated(), is(false));
jobSemaphore.release();
assertThat(executor.awaitTermination(2, MINUTES), is(true));
assertThat(executor.isShutdown(), is(true));

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