/** Send the message over the channel specified by the message. */
protected void write(Channel channel, PaxosMessage msg) {
ChannelFuture future;
// Send out a command.
future = channel.write(msg); // Write the contents to the channel.
future.addListener(this);
}
/** Starts the initiation process for synching. */
public void startClient(final String host, final int port, final PaxosMessage msg) {
ChannelFuture future;
ClientBootstrap client;
// Bootstrap a new client. Not sure if the
// clientFactory is thread-safe or not, so play it safe.
synchronized (this) {
client = new ClientBootstrap(clientFactory);
}
// Set some TCP options.
client.setOption("tcpNoDelay", true);
client.setOption("keepAlive", true);
// Create a new connection & state manager.
final CommManager manager = new CommManager();
client.setPipelineFactory(
new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() {
return Channels.pipeline(
new PaxosMessageDecoder(), new PaxosMessageEncoder(), manager);
}
});
// Include the data we want to send.
manager.start(msg);
// Try to connect to the host.
future = client.connect(new InetSocketAddress(host, port));
future.addListener(
new ChannelFutureListener() {
public void operationComplete(ChannelFuture f) {
if (f.isDone() && !f.isSuccess()) {
// This is a connection failure. This is not necessarily
// the end of the world. Chances are that a client has
// shut down and its routing information hasn't been updated yet.
if (!network.updateDisconnected(host, port)) {}
}
}
});
}
/** The write operation has completed. */
@Override
public void operationComplete(ChannelFuture future) throws Exception {
// Try closing the channel so that we don't leak descriptors.
future.getChannel().close();
}