Example usage for java.nio.channels SocketChannel write

Introduction

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

Prototype

public abstract long write(ByteBuffer[] srcs, int offset, int length) throws IOException;

Source Link

Usage

From source file:org.apache.htrace.impl.PackedBufferManager.java

/**
 * Send the provided ByteBuffer objects.
 *
 * We use non-blocking I/O because Java does not provide write timeouts.
 * Without a write timeout, the socket could get hung and we'd never recover.
 * We also use the GatheringByteChannel#write method which calls the pread()
 * system call under the covers.  This ensures that even if TCP_NODELAY is on,
 * we send the minimal number of packets.
 *///w w  w . j  a va 2s  . co m
private void doSend(SelectionKey sockKey, ByteBuffer[] bufs) throws IOException {
    long totalWritten = 0;
    sockKey.interestOps(SelectionKey.OP_WRITE);
    SocketChannel sock = (SocketChannel) sockKey.attachment();
    long startMs = TimeUtil.nowMs();
    long remainingMs = conf.ioTimeoutMs;
    while (true) {
        selector.select(remainingMs);
        int firstBuf = 0;
        for (SelectionKey key : selector.selectedKeys()) {
            if (key.isWritable()) {
                long written = sock.write(bufs, firstBuf, bufs.length - firstBuf);
                if (LOG.isTraceEnabled()) {
                    LOG.trace("Sent " + written + " bytes to " + conf.endpointStr);
                }
                totalWritten += written;
            }
        }
        while (true) {
            if (firstBuf == bufs.length) {
                if (LOG.isTraceEnabled()) {
                    LOG.trace("Finished sending " + totalWritten + " bytes to " + conf.endpointStr);
                }
                return;
            }
            if (bufs[firstBuf].remaining() > 0) {
                break;
            }
            firstBuf++;
        }
        remainingMs = updateRemainingMs(startMs, conf.ioTimeoutMs);
        if (remainingMs == 0) {
            throw new IOException("Attempt to write to " + conf.endpointStr + " timed out after "
                    + TimeUtil.deltaMs(startMs, TimeUtil.nowMs()) + " ms.");
        }
    }
}

---