Examples of java.nio.channels.Pipe

java.nio.channels.Pipe
A pair of channels that implements a unidirectional pipe.
A pipe consists of a pair of channels: A writable {@link Pipe.SinkChannel sink} channel and a readable {@link Pipe.SourceChannel source}channel. Once some bytes are written to the sink channel they can be read from source channel in exactlyAthe order in which they were written.
Whether or not a thread writing bytes to a pipe will block until another thread reads those bytes, or some previously-written bytes, from the pipe is system-dependent and therefore unspecified. Many pipe implementations will buffer up to a certain number of bytes between the sink and source channels, but such buffering should not be assumed.
@author Mark Reinhold @author JSR-51 Expert Group @since 1.4

        SecurityManager old = System.getSecurityManager();
        SecurityManager sm = new MockSM();


        try {
            System.setSecurityManager(sm);
            Pipe pipe = Pipe.open();
            assertNotNull(pipe);
        } finally {
            System.setSecurityManager(old);
        }
    }

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  /**
   * @tests java.nio.channels.Pipe#sink()
   */
  public void test_sink() throws IOException {
    Pipe pipe = Pipe.open();
    SinkChannel sink = pipe.sink();
    assertTrue(sink.isBlocking());
  }

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  /**
   * @tests java.nio.channels.Pipe#source()
   */
  public void test_source() throws IOException {
    Pipe pipe = Pipe.open();
    SourceChannel source = pipe.source();
    assertTrue(source.isBlocking());
  }

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    @JRubyMethod(name = "pipe", meta = true, compat = RUBY1_8)
    public static IRubyObject pipe(ThreadContext context, IRubyObject recv) {
        // TODO: This isn't an exact port of MRI's pipe behavior, so revisit
        Ruby runtime = context.runtime;
        try {
            Pipe pipe = Pipe.open();


            RubyIO source = new RubyIO(runtime, pipe.source());
            RubyIO sink = new RubyIO(runtime, pipe.sink());


            sink.openFile.getMainStreamSafe().setSync(true);
            return runtime.newArrayNoCopy(new IRubyObject[]{source, sink});
        } catch (BadDescriptorException e) {
            throw runtime.newErrnoEBADFError();

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    @JRubyMethod(name = "pipe", meta = true, compat = RUBY1_9)
    public static IRubyObject pipe19(ThreadContext context, IRubyObject recv, IRubyObject modes) {
        Ruby runtime = context.runtime;
        try {
            Pipe pipe = Pipe.open();


            RubyIO source = new RubyIO(runtime, pipe.source());
            source.setEncodingFromOptions(EncodingOption.getEncodingOptionFromString(runtime, modes.toString()));
            RubyIO sink = new RubyIO(runtime, pipe.sink());


//            Encoding ascii8bit = context.runtime.getEncodingService().getAscii8bitEncoding();
//            sink.setupReadWriteEncodings(context, ascii8bit, ascii8bit);


            sink.openFile.getMainStreamSafe().setSync(true);

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        }
    }


    public PipeImpl() throws IOException {
        if (useNative) {
            Pipe pipe = Pipe.open();
            source = pipe.source();
            sink = pipe.sink();


        } else {
            PipedInputStream pipedIn = new PipedInputStream();
            try {
                pipedOut = new PipedOutputStream(pipedIn);

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    }


    @Test(timeout = 5000)
    public void testWriteToByteChannel() throws IOException {


        final Pipe pipe = Pipe.open();


        executor.execute(new Runnable() {


            @Override
            public void run() {


                try {
                    info.writeTo(pipe.sink());
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });


        final Parsed<SBDInfo> parsed = SBDInfo.readFrom(pipe.source(), FEC_PARAMS);


        if (valid) {
            assertEquals(info, parsed.value());
        }
        else {

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    }


    @Test(timeout = 5000)
    public void testWriteToByteChannel() throws IOException {


        final Pipe pipe = Pipe.open();


        executor.execute(new Runnable() {


            @Override
            public void run() {


                try {
                    PARAMS.writeTo(pipe.sink());
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });


        final Parsed<FECParameters> parsed = FECParameters.readFrom(pipe.source());


        assertEquals(PARAMS, parsed.value());
    }

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  // REMIND: create threads and other resources lazily?


  selector = Selector.open();


  Pipe pipe = Pipe.open();
  wakeupPipeSink = pipe.sink();
  wakeupPipeSource = pipe.source();
  wakeupPipeSource.configureBlocking(false);
  wakeupPipeKey = wakeupPipeSource.register(selector,
              SelectionKey.OP_READ);


  for (int i = 0; i < concurrency; i++) {

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    params2.setAddCollectionHeader(params.isAddCollectionHeader());
    params2.setAddCollectionFooter(params.isAddCollectionFooter());
    params2.setAddDoctype(params.isAddDoctype());
    params2.setProperties(params.getProperties());


    final Pipe pipe = Pipe.open();
    final ConversionTask task = new ConversionTask();
    task.setConverter(this.c1);
    task.setIn(in);
    task.setOut(Channels.newOutputStream(pipe.sink()));
    task.setParams(params1);
    final ExecutorService taskPool = Executors.newSingleThreadExecutor();
    final Future<Exception> f = taskPool.submit(task);
    taskPool.shutdown();
    Exception e1 = null;
    Exception e2 = null;
    try {
      this.c2.convert(Channels.newInputStream(pipe.source()), out,
          params2);
      e1 = f.get();
    } catch (final Exception e) {
      e2 = e;
    }

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