private void handleWritableChannel(SelectionKey key, SelectableChannel channel) {
try {
if (!key.isWritable()) return;
ByteBuffer buffer = this.outputBuffers.get(channel);
buffer.flip();
((WritableByteChannel) channel).write(buffer);
// If there aren't any bytes left to write from the buffer, tell the
// selector that we no longer want to write to the channel (and-not
// disables only that bit)
if (0 == buffer.remaining()) key.interestOps(key.interestOps() & ~SelectionKey.OP_WRITE);
buffer.compact();
// The code below the catch blocks below is for error-handling only
return;
} catch (CancelledKeyException e) {
// Error-handling code below to avoid code duplication
} catch (ClosedChannelException e) {
// Error-handling code below to avoid code duplication
} catch (EOFException e) {
// Error-handling code below to avoid code duplication
} catch (IOException e) {
reportIOException(e);
// Continue with the error-handling code below
}
this.outputBuffers.remove(channel);
// Close and remove any routes that point to this channel as an output
Iterator<Map.Entry<SelectableChannel, SelectableChannel>> i =
this.outputs.entrySet().iterator();
while (i.hasNext()) {
Map.Entry<SelectableChannel, SelectableChannel> entry = i.next();
if (entry.getValue().equals(channel)) {
closeChannelAndReportException(entry.getKey());
i.remove();
}
}
try {
// No longer interested in handling this channel for write
// operations
key.interestOps(key.interestOps() & ~SelectionKey.OP_WRITE);
} catch (CancelledKeyException e) {
// Do nothing
}
// The channel should already be closed, but just in case
closeChannelAndReportException(channel);
}
public static void main(String[] args) throws IOException {
FileInputStream fin = new FileInputStream(args[0]);
GZIPInputStream gzin = new GZIPInputStream(fin);
ReadableByteChannel in = Channels.newChannel(gzin);
WritableByteChannel out = Channels.newChannel(System.out);
ByteBuffer buffer = ByteBuffer.allocate(65536);
while (in.read(buffer) != -1) {
buffer.flip();
out.write(buffer);
buffer.clear();
}
}
/**
* Write all remaining bytes in buffer to the given channel. If the channel is selectable then it
* must be configured blocking.
*/
private static void writeFullyImpl(WritableByteChannel ch, ByteBuffer bb) throws IOException {
while (bb.remaining() > 0) {
int n = ch.write(bb);
if (n <= 0) throw new RuntimeException("no bytes written");
}
}