Examples of SeekableByteChannel

java.nio.channels.SeekableByteChannel
A byte channel that maintains a current position and allows the position to be changed.
A seekable byte channel is connected to an entity, typically a file, that contains a variable-length sequence of bytes that can be read and written. The current position can be {@link #position() queried} and{@link #position(long) modified}. The channel also provides access to the current size of the entity to which the channel is connected. The size increases when bytes are written beyond its current size; the size decreases when it is {@link #truncate truncated}.
The {@link #position(long) position} and {@link #truncate truncate} methodswhich do not otherwise have a value to return are specified to return the channel upon which they are invoked. This allows method invocations to be chained. Implementations of this interface should specialize the return type so that method invocations on the implementation class can be chained. @since 1.7 @see java.nio.file.Files#newByteChannel
org.uberfire.java.nio.channels.SeekableByteChannel

Examples of java.nio.channels.SeekableByteChannel

    super.close();
  }


  private SeekableByteChannel openByteChannelAtCurrentPosition() {
    try {
      SeekableByteChannel channel = Files.newByteChannel(logfile, StandardOpenOption.READ);
      Optional<Long> previousPosition = store.getPosition(tailMetadata);
      if (previousPosition.isPresent()) {
        long storePosition = previousPosition.get();


        if (storePosition < channel.size()) {
          LOG.warn("Found {} with size {} and position {}, resetting to 0", logfile, channel.size(), storePosition);
          savePosition(0);
        } else {
          channel.position(previousPosition.get());
        }
      }
      return channel;
    } catch (IOException e) {
      throw Throwables.propagate(e);

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Examples of java.nio.channels.SeekableByteChannel


  @Test
  public void testOpenChannelsClosed() throws IOException {
    Path p = fs.getPath("/foo");
    FileChannel fc = FileChannel.open(p, READ, WRITE, CREATE);
    SeekableByteChannel sbc = Files.newByteChannel(p, READ);
    AsynchronousFileChannel afc = AsynchronousFileChannel.open(p, READ, WRITE);


    assertTrue(fc.isOpen());
    assertTrue(sbc.isOpen());
    assertTrue(afc.isOpen());


    fs.close();


    assertFalse(fc.isOpen());
    assertFalse(sbc.isOpen());
    assertFalse(afc.isOpen());


    try {
      fc.size();
      fail();
    } catch (ClosedChannelException expected) {
    }


    try {
      sbc.size();
      fail();
    } catch (ClosedChannelException expected) {
    }


    try {

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel

        final String userBasedPath = System.getProperty( "user.dir" ) + "/byte_some_file_here.txt";


        final Path path = GeneralPathImpl.create( fsProvider.getFileSystem( URI.create( "file:///" ) ), userBasedPath, false );
        assertThat( path.toFile().exists() ).isFalse();


        final SeekableByteChannel channel = fsProvider.newByteChannel( path, null );


        assertThat( channel ).isNotNull();
        assertThat( path.toFile().exists() ).isTrue();
        path.toFile().delete();
        assertThat( path.toFile().exists() ).isFalse();

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel

        final String userBasedPath = System.getProperty( "user.dir" ) + "/my_byte_some_file_here.txt";


        final Path path = GeneralPathImpl.create( fsProvider.getFileSystem( URI.create( "file:///" ) ), userBasedPath, false );
        assertThat( path.toFile().exists() ).isFalse();


        final SeekableByteChannel channel = fsProvider.newByteChannel( path, null );


        assertThat( channel ).isNotNull();
        assertThat( path.toFile().exists() ).isTrue();


        assertThat( channel.isOpen() ).isTrue();


        channel.close();


        assertThat( channel.isOpen() ).isFalse();


//        try {
//            channel.position();
//            fail( "method not implemented - exception expected!" );
//        } catch ( NotImplementedException ex ) {

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel


    @Test
    public void test() throws IOException {
        final File tempFile = File.createTempFile( "foo", "bar" );


        final SeekableByteChannel sbc = new SeekableByteChannelFileBasedImpl( new RandomAccessFile( tempFile, "rw" ).getChannel() );


        assertTrue( sbc.isOpen() );
        sbc.write( ByteBuffer.wrap( "CONTENT\n?!".getBytes() ) );


        sbc.position( 0L );
        ByteBuffer buffer = ByteBuffer.allocate( 10 );
        sbc.read( buffer );
        assertEquals( "CONTENT\n?!", new String( buffer.array() ) );


        sbc.close();
        assertFalse( sbc.isOpen() );


    }

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel


    @Test
    public void testPosition() throws IOException {
        final File tempFile = File.createTempFile( "foo", "bar" );


        final SeekableByteChannel sbc = new SeekableByteChannelFileBasedImpl( new RandomAccessFile( tempFile, "rw" ).getChannel() );


        assertTrue( sbc.isOpen() );
        sbc.write( ByteBuffer.wrap( "CONTENT\n?!".getBytes() ) );


        assertEquals( 10L, sbc.position() );
        assertEquals( 10L, sbc.size() );


        sbc.position( 1L );
        ByteBuffer buffer = ByteBuffer.allocate( 8 );
        sbc.read( buffer );
        assertEquals( "ONTENT\n?", new String( buffer.array() ) );


        assertEquals( 9L, sbc.position() );


        sbc.position( 0L );
        sbc.truncate( 2L );
        ByteBuffer buffer3 = ByteBuffer.allocate( 2 );
        sbc.read( buffer3 );
        assertEquals( "CO", new String( buffer3.array() ) );


        sbc.close();
        assertFalse( sbc.isOpen() );


    }

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel

    }


    @Override
    public SeekableByteChannel newByteChannel( final Path path,
                                               final OpenOption... options ) throws IllegalArgumentException, UnsupportedOperationException, FileAlreadyExistsException, IOException, SecurityException {
        final SeekableByteChannel sbc = service.newByteChannel( path, options );


        return new SeekableByteChannelWrapperImpl( sbc ) {
            @Override
            public void close() throws java.io.IOException {
                new FileSystemSyncLock<Void>( service.getId(), path.getFileSystem() ).execute( clusterService, new FutureTask<Void>( new Callable<Void>() {
                    @Override
                    public Void call() throws Exception {
                        sbc.close();
                        return null;
                    }
                } ) );
            }
        };

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel


    @Override
    public SeekableByteChannel newByteChannel( final Path path,
                                               final Set<? extends OpenOption> options,
                                               final FileAttribute<?>... attrs ) throws IllegalArgumentException, UnsupportedOperationException, FileAlreadyExistsException, IOException, SecurityException {
        final SeekableByteChannel sbc = service.newByteChannel( path, options, attrs );


        return new SeekableByteChannelWrapperImpl( sbc ) {
            @Override
            public void close() throws java.io.IOException {
                new FileSystemSyncLock<Void>( service.getId(), path.getFileSystem() ).execute( clusterService, new FutureTask<Void>( new Callable<Void>() {
                    @Override
                    public Void call() throws Exception {
                        sbc.close();
                        return null;
                    }
                } ) );
            }
        };

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel

        if ( exists( dot( path ) ) ) {
            properties.load( newInputStream( dot( path ) ) );
        }
        final FileAttribute<?>[] allAttrs = consolidate( properties, attrs );


        final SeekableByteChannel result = Files.newByteChannel( path, buildOptions( options ), allAttrs );


        if ( isFileScheme( path ) ) {
            buildDotFile( path, newOutputStream( dot( path ) ), allAttrs );
        }

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Examples of org.uberfire.java.nio.channels.SeekableByteChannel

    public synchronized Path write( final Path path,
                                    final byte[] bytes,
                                    final Set<? extends OpenOption> options,
                                    final FileAttribute<?>... attrs ) throws IllegalArgumentException, IOException, UnsupportedOperationException {
        waitFSUnlock( path );
        SeekableByteChannel byteChannel;
        try {
            byteChannel = newByteChannel( path, buildOptions( options ), attrs );
        } catch ( final FileAlreadyExistsException ex ) {
            ( (AbstractPath) path ).clearCache();
            byteChannel = newByteChannel( path, buildOptions( options, TRUNCATE_EXISTING ), attrs );
        }


        try {
            byteChannel.write( ByteBuffer.wrap( bytes ) );
            byteChannel.close();
        } catch ( final java.io.IOException e ) {
            throw new IOException( e );
        }


        return path;

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