Examples of java.util.concurrent.Semaphore.tryAcquire()

java.util.concurrent.Semaphore.tryAcquire()
Acquires a permit from this semaphore, only if one is available at the time of invocation.
Acquires a permit, if one is available and returns immediately, with the value {@code true}, reducing the number of available permits by one.
If no permit is available then this method will return immediately with the value {@code false}.
Even when this semaphore has been set to use a fair ordering policy, a call to {@code tryAcquire()} willimmediately acquire a permit if one is available, whether or not other threads are currently waiting. This "barging" behavior can be useful in certain circumstances, even though it breaks fairness. If you want to honor the fairness setting, then use {@link #tryAcquire(long,TimeUnit) tryAcquire(0, TimeUnit.SECONDS) }which is almost equivalent (it also detects interruption). @return {@code true} if a permit was acquired and {@code false}otherwise

            tracker.open();


            try {
                configs[0].delete();


                if (!sem.tryAcquire(1, TimeUnit.SECONDS)) {
                    throw new IOException("Instance did not get removed in time.");
                }
            }
            finally {
                tracker.close();

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            for (int i = 0; i < configs.length; i++) {
                configs[i].delete();
            }


            if (!sem.tryAcquire(1, TimeUnit.SECONDS)) {
                throw new IOException("Not all instances were removed in time.");
            }
            tracker.close();
        }
    }

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                     }


                     message.getBodyBuffer().writeBytes(new byte[50]);


                     producer.send(message);
                     assertTrue(semop.tryAcquire(1, 10, TimeUnit.SECONDS));
                  }
               }
               catch (Throwable e)
               {
                  e.printStackTrace(System.out);

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                        throw (Error) t;
                    } 
                }
        }}, taskOwner);


        assertTrue(doneFlag.tryAcquire(2, 1, TimeUnit.SECONDS));
        Throwable throwable = error.get();
        if (throwable != null) {
            throw new AssertionError(throwable);
        }
    }

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                }
                Transaction txn = txnProxy.getCurrentTransaction();
                txn.abort(new TestAbortedTransactionException("abort"));
        }}, taskOwner);


        assertTrue(doneFlag.tryAcquire(2, 1, TimeUnit.SECONDS));
        Throwable throwable = error.get();
        if (throwable != null) {
            throw new AssertionError(throwable);
        }
    }

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            }
        }
        ShutdownTask task = new ShutdownTask();
        try {
            txnScheduler.runTask(task, taskOwner);
            assertTrue(doneFlag.tryAcquire(200, TimeUnit.MILLISECONDS));
            Throwable throwable = error.get();
            if (throwable != null) {
                throw new AssertionError(throwable);
            }
        } finally {

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      UsePrepareAndCommit.ARBITRARY, 20000);
        /* Get write lock on name-299 and notify txn */
        store.setBinding(txn2, "name-299", id2);
        flag.release();
        /* Wait for txn, then commit */
        flag2.tryAcquire(10000, TimeUnit.MILLISECONDS);
        txn2.commit();
    } catch (TransactionAbortedException e) {
        System.err.println("txn2: " + e);
        exception2 = e;
    } catch (Exception e) {

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    public void run() { 
                }
            }, taskOwner);
            
        // Calling reports is asynchronous
        flag.tryAcquire(100, TimeUnit.MILLISECONDS);
        assertTrue(test.reportCalls > 0);
    }
    
    @Test
    public void testAddListenerTwice() throws Exception {

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                public void run() {
                    AppContext.getDataManager().
                        createReference(new DummyObject());
                }
            }, serverNode.getProxy().getCurrentOwner());
        if (! sem.tryAcquire(500, TimeUnit.MILLISECONDS)) {
            throw new RuntimeException("Listener never reported");
        }
        if (throwableRef.get() != null) {
            throw new RuntimeException("listener failed", throwableRef.get());
        }

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                            createReference(new DummyObject());
                        throw new ExpectedException();
                    }
                }, serverNode.getProxy().getCurrentOwner());
        } catch (ExpectedException ee) {}
        if (! sem.tryAcquire(500, TimeUnit.MILLISECONDS)) {
            throw new RuntimeException("Listener never reported");
        }
        if (throwableRef.get() != null) {
            throw new RuntimeException("listener failed", throwableRef.get());
        }

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