Examples of co.paralleluniverse.fibers.Fiber

co.paralleluniverse.fibers.Fiber
A lightweight thread.
There are two ways to create a new fiber: either subclass the {@code Fiber} class and override the {@code run} method,or pass the code to be executed in the fiber as the {@code target} parameter to the constructor. All in all, the Fiber APIresembles the {@link Thread} class in many ways.
A fiber runs inside a ForkJoinPool.
A Fiber can be serialized if it's not running and all involved classes and data types are also {@link Serializable}.
A new Fiber occupies under 400 bytes of memory (when using the default stack size, and compressed OOPs are turned on, as they are by default). @param < V> The type of the fiber's result value. Should be set to {@link Void} if no value is to be returned by the fiber. @author pron

    @Test
    public void testZipWithTimeoutsThreadToFiber() throws Exception {
        final Channel<String> ch1 = newChannel();
        final Channel<Integer> ch2 = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                ReceivePort<String> ch = Channels.zip(ch1, ch2, new Function2<String, Integer, String>() {
                    @Override
                    public String apply(String x1, Integer x2) {
                        return x1 + x2;
                    }
                });


                String m1 = ch.receive();
                String m0 = ch.receive(30, TimeUnit.MILLISECONDS);
                String m2 = ch.receive(40, TimeUnit.MILLISECONDS);
                String m3 = ch.receive();
                String m4 = ch.receive();


                assertThat(m1, equalTo("a1"));
                assertThat(m0, is(nullValue()));
                assertThat(m2, equalTo("b2"));
                assertThat(m3, equalTo("c3"));
                assertThat(m4, is(nullValue()));
            }
        }).start();


        Strand.sleep(50);
        ch1.send("a");
        ch2.send(1);
        ch1.send("b");
        Strand.sleep(50);
        ch2.send(2);
        ch1.send("c");
        ch2.send(3);
        ch1.send("foo");
        ch2.close();
        fib.join();
    }

View Full Code Here


    @Test
    public void testFlatmapThreadToFiber() throws Exception {
        final Channel<Integer> ch1 = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                ReceivePort<Integer> ch = Channels.flatMap(ch1, new Function<Integer, ReceivePort<Integer>>() {
                    @Override
                    public ReceivePort<Integer> apply(Integer x) {
                        if (x == 3)
                            return null;
                        if (x % 2 == 0)
                            return Channels.toReceivePort(Arrays.asList(new Integer[]{x * 10, x * 100, x * 1000}));
                        else
                            return Channels.singletonReceivePort(x);
                    }
                });


                assertThat(ch.receive(), is(1));
                assertThat(ch.receive(), is(20));
                assertThat(ch.receive(), is(200));
                assertThat(ch.receive(), is(2000));
                assertThat(ch.receive(), is(40));
                assertThat(ch.receive(), is(400));
                assertThat(ch.receive(), is(4000));
                assertThat(ch.receive(), is(5));
                assertThat(ch.receive(), is(nullValue()));
                assertThat(ch.isClosed(), is(true));
            }
        }).start();


        Strand.sleep(50);
        ch1.send(1);
        ch1.send(2);
        ch1.send(3);
        ch1.send(4);
        ch1.send(5);
        ch1.close();
        fib.join();
    }

View Full Code Here


    @Test
    public void testFlatmapWithTimeoutsThreadToFiber() throws Exception {
        final Channel<Integer> ch1 = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                ReceivePort<Integer> ch = Channels.flatMap(ch1, new Function<Integer, ReceivePort<Integer>>() {
                    @Override
                    public ReceivePort<Integer> apply(Integer x) {
                        if (x == 3)
                            return null;
                        if (x % 2 == 0)
                            return Channels.toReceivePort(Arrays.asList(new Integer[]{x * 10, x * 100, x * 1000}));
                        else
                            return Channels.singletonReceivePort(x);
                    }
                });


                assertThat(ch.receive(), is(1));
                assertThat(ch.receive(30, TimeUnit.MILLISECONDS), is(nullValue()));
                assertThat(ch.receive(40, TimeUnit.MILLISECONDS), is(20));
                assertThat(ch.receive(), is(200));
                assertThat(ch.receive(), is(2000));
                assertThat(ch.receive(), is(40));
                assertThat(ch.receive(), is(400));
                assertThat(ch.receive(), is(4000));
                assertThat(ch.receive(30, TimeUnit.MILLISECONDS), is(nullValue()));
                assertThat(ch.receive(40, TimeUnit.MILLISECONDS), is(5));
                assertThat(ch.receive(), is(nullValue()));
                assertThat(ch.isClosed(), is(true));
            }
        }).start();


        Strand.sleep(50);
        ch1.send(1);
        Strand.sleep(50);
        ch1.send(2);
        ch1.send(3);
        ch1.send(4);
        Strand.sleep(50);
        ch1.send(5);
        ch1.close();
        fib.join();
    }

View Full Code Here


    @Test
    public void sendMessageFromFiberToFiber() throws Exception {
        final Channel<String> ch = newChannel();


        Fiber fib1 = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                String m = ch.receive();


                assertThat(m, equalTo("a message"));
            }
        }).start();


        Fiber fib2 = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                Fiber.sleep(50);
                ch.send("a message");
            }
        }).start();


        fib1.join();
        fib2.join();
    }

View Full Code Here


    @Test
    public void sendMessageFromThreadToFiber() throws Exception {
        final Channel<String> ch = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                String m = ch.receive();


                assertThat(m, equalTo("a message"));
            }
        }).start();


        Thread.sleep(50);
        ch.send("a message");


        fib.join();
    }

View Full Code Here


    @Test
    public void sendMessageFromFiberToThread() throws Exception {
        final Channel<String> ch = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                Fiber.sleep(100);


                ch.send("a message");
            }
        }).start();


        String m = ch.receive();


        assertThat(m, equalTo("a message"));


        fib.join();
    }

View Full Code Here

    @Test
    public void whenReceiveNotCalledFromOwnerThenThrowException1() throws Exception {
        assumeTrue(Debug.isAssertionsEnabled());
        final Channel<String> ch = newChannel();


        Fiber fib1 = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                String m = ch.receive();


                assertThat(m, equalTo("a message"));
            }
        }).start();


        Fiber fib2 = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                Fiber.sleep(50);
                ch.send("a message");


                boolean thrown = false;
                try {
                    ch.receive();
                } catch (Throwable e) {
                    thrown = true;
                }
                assertTrue(thrown);
            }
        }).start();


        fib1.join();
        fib2.join();
    }

View Full Code Here

    @Test
    public void whenReceiveNotCalledFromOwnerThenThrowException2() throws Exception {
        assumeTrue(Debug.isAssertionsEnabled());
        final Channel<String> ch = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                String m = ch.receive();


                assertThat(m, equalTo("a message"));
            }
        }).start();


        Thread.sleep(50);
        ch.send("a message");


        boolean thrown = false;
        try {
            ch.receive();
        } catch (Throwable e) {
            thrown = true;
        }
        assertTrue(thrown);


        fib.join();
    }

View Full Code Here

    @Test
    public void whenReceiveNotCalledFromOwnerThenThrowException3() throws Exception {
        assumeTrue(Debug.isAssertionsEnabled());
        final Channel<String> ch = newChannel();


        Fiber fib = new Fiber("fiber", scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                Fiber.sleep(100);


                ch.send("a message");


                boolean thrown = false;
                try {
                    ch.receive();
                } catch (Throwable e) {
                    thrown = true;
                }
                assertTrue(thrown);
            }
        }).start();


        String m = ch.receive();


        assertThat(m, equalTo("a message"));


        fib.join();
    }

View Full Code Here


    @Test
    public void testChannelClose() throws Exception {
        final Channel<Integer> ch = newChannel();


        Fiber fib = new Fiber(scheduler, new SuspendableRunnable() {
            @Override
            public void run() throws SuspendExecution, InterruptedException {
                for (int i = 1; i <= 5; i++) {
                    Integer m = ch.receive();


                    assertThat(m, equalTo(i));
                }


                Integer m = ch.receive();


                assertThat(m, nullValue());
                assertTrue(ch.isClosed());
            }
        }).start();


        Thread.sleep(50);
        ch.send(1);
        ch.send(2);
        ch.send(3);
        ch.send(4);
        ch.send(5);


        ch.close();


        ch.send(6);
        ch.send(7);


        fib.join();
    }

View Full Code Here

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