Example usage for java.nio.channels WritableByteChannel write

Introduction

In this page you can find the example usage for java.nio.channels WritableByteChannel write.

Prototype

public int write(ByteBuffer src) throws IOException;

Source Link

Document

Writes a sequence of bytes to this channel from the given buffer.

Usage

From source file:org.geoserver.rest.util.IOUtils.java

/**
 * Copies the content of the source channel onto the destination channel.
 * //from ww  w. j a va 2 s  .c  o m
 * @param bufferSize size of the temp buffer to use for this copy.
 * @param source the source {@link ReadableByteChannel}.
 * @param destination the destination {@link WritableByteChannel};.
 * @throws IOException in case something bad happens.
 */
public static void copyChannel(int bufferSize, ReadableByteChannel source, WritableByteChannel destination)
        throws IOException {

    inputNotNull(source, destination);
    if (!source.isOpen() || !destination.isOpen())
        throw new IllegalStateException("Source and destination channels must be open.");

    final java.nio.ByteBuffer buffer = java.nio.ByteBuffer.allocateDirect(bufferSize);
    while (source.read(buffer) != -1) {
        //prepare the buffer for draining
        buffer.flip();

        //write to destination
        while (buffer.hasRemaining())
            destination.write(buffer);

        //clear
        buffer.clear();

    }

}

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From source file:backtype.storm.utils.Utils.java

public static void downloadFromMaster(Map conf, String file, String localFile) throws IOException, TException {
    WritableByteChannel out = null;
    NimbusClient client = null;//ww w . j  a  v a 2  s  .  c  o m
    try {
        client = NimbusClient.getConfiguredClient(conf, 10 * 1000);
        String id = client.getClient().beginFileDownload(file);
        out = Channels.newChannel(new FileOutputStream(localFile));
        while (true) {
            ByteBuffer chunk = client.getClient().downloadChunk(id);
            int written = out.write(chunk);
            if (written == 0) {
                client.getClient().finishFileDownload(id);
                break;
            }
        }
    } finally {
        if (out != null)
            out.close();
        if (client != null)
            client.close();
    }
}

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From source file:org.docx4j.openpackaging.parts.WordprocessingML.BinaryPart.java

/**
 * Copy the ByteBuffer containing this part's binary data
 * to an output stream./*from   ww  w .j a  v a 2s  . com*/
 * 
 * @param out
 * @throws IOException
 */
public void writeDataToOutputStream(OutputStream out) throws IOException {

    ByteBuffer buf = this.getBuffer();
    buf.rewind();

    // Fix for https://github.com/plutext/docx4j/issues/80
    // from http://stackoverflow.com/questions/579600/how-to-put-the-content-of-a-bytebuffer-into-an-outputstream
    WritableByteChannel channel = Channels.newChannel(out);
    channel.write(buf);
    buf.rewind();

}

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From source file:org.springframework.boot.devtools.tunnel.payload.HttpTunnelPayload.java

/**
 * Assign this payload to the given {@link HttpOutputMessage}.
 * @param message the message to assign this payload to
 * @throws IOException in case of I/O errors
 *///from  w  w w.  j av a 2 s .com
public void assignTo(HttpOutputMessage message) throws IOException {
    Assert.notNull(message, "Message must not be null");
    HttpHeaders headers = message.getHeaders();
    headers.setContentLength(this.data.remaining());
    headers.add(SEQ_HEADER, Long.toString(getSequence()));
    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    WritableByteChannel body = Channels.newChannel(message.getBody());
    while (this.data.hasRemaining()) {
        body.write(this.data);
    }
    body.close();
}

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From source file:com.bennavetta.appsite.file.ResourceService.java

private void copy(ReadableByteChannel src, WritableByteChannel dest) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize.get());
    while (src.read(buffer) != -1 || buffer.position() != 0) {
        buffer.flip();//from ww  w. j  av  a 2s.  c o m
        dest.write(buffer);
        buffer.compact();
    }
}

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From source file:org.springframework.boot.devtools.tunnel.payload.HttpTunnelPayload.java

/**
 * Write the content of this payload to the given target channel.
 * @param channel the channel to write to
 * @throws IOException in case of I/O errors
 *//*from   ww w.  ja v a 2  s  . c  o  m*/
public void writeTo(WritableByteChannel channel) throws IOException {
    Assert.notNull(channel, "Channel must not be null");
    while (this.data.hasRemaining()) {
        channel.write(this.data);
    }
}

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From source file:org.mycore.common.content.util.MCRServletContentHelper.java

private static long copyChannel(final ReadableByteChannel src, final WritableByteChannel dest,
        final int bufferSize) throws IOException {
    if (src instanceof FileChannel) {
        return copyFileChannel((FileChannel) src, dest, bufferSize);
    }//w w w.  j  av  a 2  s . c  o m
    long bytes = 0;
    final ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
    while (src.read(buffer) != -1) {
        // prepare the buffer to be drained
        buffer.flip();

        // write to the channel, may block
        bytes += dest.write(buffer);
        // If partial transfer, shift remainder down
        // If buffer is empty, same as doing clear()
        buffer.compact();
    }
    // EOF will leave buffer in fill state
    buffer.flip();
    // make sure the buffer is fully drained.
    while (buffer.hasRemaining()) {
        bytes += dest.write(buffer);
    }
    return bytes;
}

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From source file:com.github.matthesrieke.jprox.JProxViaParameterServlet.java

private void copyChannel(final ReadableByteChannel src, final WritableByteChannel dest) throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);

    while (src.read(buffer) != -1) {
        buffer.flip();//from ww  w .  ja va2  s . c  o m
        dest.write(buffer);
        buffer.compact();
    }

    buffer.flip();

    while (buffer.hasRemaining()) {
        dest.write(buffer);
    }
}

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From source file:com.taobao.adfs.distributed.rpc.Server.java

/**
 * This is a wrapper around {@link WritableByteChannel#write(ByteBuffer)}. If the amount of data is large, it writes
 * to channel in smaller chunks. This is to avoid jdk from creating many direct buffers as the size of buffer
 * increases. This also minimizes extra copies in NIO layer as a result of multiple write operations required to write
 * a large buffer.//w w  w. jav  a  2s. c o  m
 * 
 * @see WritableByteChannel#write(ByteBuffer)
 */
private static int channelWrite(WritableByteChannel channel, ByteBuffer buffer) throws IOException {

    return (buffer.remaining() <= NIO_BUFFER_LIMIT) ? channel.write(buffer) : channelIO(null, channel, buffer);
}

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From source file:com.bittorrent.mpetazzoni.tracker.TrackerService.java

/**
 * Write a {@link HTTPTrackerErrorMessage} to the response with the given
 * HTTP status code./*  www .j  av  a  2s  .com*/
 *
 * @param response The HTTP response object.
 * @param body The response output stream to write to.
 * @param status The HTTP status code to return.
 * @param error The error reported by the tracker.
 */
private void serveError(Response response, OutputStream body, Status status, HTTPTrackerErrorMessage error)
        throws IOException {
    response.setCode(status.getCode());
    response.setText(status.getDescription());
    logger.warn("Could not process announce request ({}) !", error.getReason());

    WritableByteChannel channel = Channels.newChannel(body);
    channel.write(error.getData());
}

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