Example usage for java.nio.channels ReadableByteChannel read

List of usage examples for java.nio.channels ReadableByteChannel read

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Introduction

In this page you can find the example usage for java.nio.channels ReadableByteChannel read.

Prototype

public int read(ByteBuffer dst) throws IOException;

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Document

Reads a sequence of bytes from this channel into the given buffer.

Usage

From source file:com.linkedin.databus.core.DbusEventBuffer.java

/**
 * Read events from a channel for readEvents().
 *
 * @param readChannel      the channel to read from
 * @param readBuffer       the buffer to read into
 * @param logDebugEnabled  if debug logging is enabled
 * @return true the read succeeded//from w w  w  .  ja v a  2  s.  co m
 */
private boolean readEventsFromChannel(ReadableByteChannel readChannel, ByteBuffer readBuffer,
        boolean logDebugEnabled) {
    if (logDebugEnabled)
        _log.debug("reading events from channel to " + readBuffer);
    boolean success = true;
    long oneread = 1;
    while (success && oneread > 0) {
        try {
            oneread = readChannel.read(readBuffer);
            if (logDebugEnabled)
                _log.debug("Read " + oneread + " bytes");
        } catch (IOException e) {
            _log.error("readEvents error: " + e.getMessage(), e);
            success = false;
        }
    }
    if (logDebugEnabled)
        _log.debug("read events from channel success=" + success + " to " + readBuffer);

    return success;
}

From source file:com.sonicle.webtop.mail.Service.java

public static void fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
    while (src.read(buffer) != -1) {
        // prepare the buffer to be drained
        buffer.flip();// w w w  . ja  va  2  s  .c o m
        // write to the channel, may block
        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()) {
        dest.write(buffer);
    }
}