Examples with ReadableByteChannel java.nio.channels.ReadableByteChannel used on opensource projects

Example 16 with ReadableByteChannel

use of java.nio.channels.ReadableByteChannel in project spring-framework by spring-projects.

the class ResourceRegionEncoder method readResourceRegion.

private Flux<DataBuffer> readResourceRegion(ResourceRegion region, DataBufferFactory bufferFactory) {
    Resource resource = region.getResource();
    try {
        if (resource.isFile()) {
            File file = region.getResource().getFile();
            AsynchronousFileChannel channel = AsynchronousFileChannel.open(file.toPath(), StandardOpenOption.READ);
            return DataBufferUtils.read(channel, region.getPosition(), bufferFactory, this.bufferSize);
        }
    } catch (IOException ignore) {
    // fallback to resource.readableChannel(), below
    }
    try {
        ReadableByteChannel channel = resource.readableChannel();
        Flux<DataBuffer> in = DataBufferUtils.read(channel, bufferFactory, this.bufferSize);
        return DataBufferUtils.skipUntilByteCount(in, region.getPosition());
    } catch (IOException ex) {
        return Flux.error(ex);
    }
}

Example 17 with ReadableByteChannel

use of java.nio.channels.ReadableByteChannel in project spring-framework by spring-projects.

the class DataBufferUtils method read.

/**
	 * Read the given {@code InputStream} into a {@code Flux} of
	 * {@code DataBuffer}s. Closes the input stream when the flux is terminated.
	 * @param inputStream the input stream to read from
	 * @param dataBufferFactory the factory to create data buffers with
	 * @param bufferSize the maximum size of the data buffers
	 * @return a flux of data buffers read from the given channel
	 */
public static Flux<DataBuffer> read(InputStream inputStream, DataBufferFactory dataBufferFactory, int bufferSize) {
    Assert.notNull(inputStream, "InputStream must not be null");
    Assert.notNull(dataBufferFactory, "DataBufferFactory must not be null");
    ReadableByteChannel channel = Channels.newChannel(inputStream);
    return read(channel, dataBufferFactory, bufferSize);
}

Example 18 with ReadableByteChannel

use of java.nio.channels.ReadableByteChannel in project robovm by robovm.

the class ChannelsTest method testNewChannelInputStream.

/*
     * Test method for 'java.nio.channels.Channels.NewChannel'
     */
public void testNewChannelInputStream() throws IOException {
    int bufSize = 10;
    int readres = 0;
    byte[] byteArray = new byte[bufSize];
    ByteBuffer byteBuf = ByteBuffer.allocate(bufSize);
    this.fins = new FileInputStream(tmpFile);
    readres = this.fins.read(byteArray);
    assertEquals(bufSize, readres);
    assertFalse(0 == this.fins.available());
    ReadableByteChannel rbChannel = Channels.newChannel(this.fins);
    // fins still reads.
    assertFalse(0 == this.fins.available());
    readres = this.fins.read(byteArray);
    assertEquals(bufSize, readres);
    // rbChannel also reads.
    assertNotNull(rbChannel);
    readres = rbChannel.read(byteBuf);
    assertEquals(bufSize, readres);
    InputStream ins = Channels.newInputStream(rbChannel);
    assertNotNull(ins);
    assertEquals(0, ins.available());
}

Example 19 with ReadableByteChannel

use of java.nio.channels.ReadableByteChannel in project robovm by robovm.

the class ChannelsTest method testNewReaderReadableByteChannelString.

/*
     * Test method for
     * 'java.nio.channels.Channels.newReader(ReadableByteChannel, String)'
     */
public void testNewReaderReadableByteChannelString() throws IOException {
    int bufSize = this.testNum;
    int readres = 0;
    CharBuffer charBuf = CharBuffer.allocate(bufSize);
    this.fins = new FileInputStream(tmpFile);
    ReadableByteChannel rbChannel = Channels.newChannel(this.fins);
    Reader testReader = Channels.newReader(rbChannel, Charset.forName(CODE_SET).newDecoder(), -1);
    //$NON-NLS-1$
    Reader testReader_s = Channels.newReader(rbChannel, CODE_SET);
    assertEquals(this.fileSize, this.fins.available());
    // not ready...
    assertFalse(testReader.ready());
    assertFalse(testReader_s.ready());
    // still reads
    readres = testReader.read(charBuf);
    assertEquals(bufSize, readres);
    assertEquals(0, this.fins.available());
    try {
        readres = testReader.read((CharBuffer) null);
        fail();
    } catch (NullPointerException e) {
    // correct
    }
    readres = testReader_s.read(charBuf);
    assertEquals(0, readres);
    assertTrue(testReader.ready());
    assertFalse(testReader_s.ready());
}

Example 20 with ReadableByteChannel

use of java.nio.channels.ReadableByteChannel in project robovm by robovm.

the class ChannelsTest method testNewChannelInputStream_BufferNull.

// test if buffer to read is null
public void testNewChannelInputStream_BufferNull() throws IOException {
    ByteBuffer byteBuf = ByteBuffer.allocate(this.testNum);
    int readres = this.testNum;
    this.fins = new FileInputStream(tmpFile);
    ReadableByteChannel rbChannel = Channels.newChannel(this.fins);
    assertNotNull(rbChannel);
    try {
        readres = rbChannel.read(null);
        fail();
    } catch (NullPointerException e) {
    // correct
    }
    assertEquals(this.testNum, readres);
    readres = 0;
    try {
        readres = rbChannel.read(byteBuf);
    } catch (NullPointerException e) {
        fail();
    }
    assertEquals(this.testNum, readres);
}