import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
/**
 * Connect to remote servers.  We'll initiate the connection to
 * any nodes with a lower ID so that there will be a single connection
 * between each pair of nodes which we'll use symmetrically
 */
protected void startClients(RPCChannelInitializer channelInitializer) {
    final Bootstrap bootstrap = new Bootstrap();
    bootstrap.group(workerGroup)
    .channel(NioSocketChannel.class)
    .option(ChannelOption.SO_REUSEADDR, true)
    .option(ChannelOption.SO_KEEPALIVE, true)
    .option(ChannelOption.TCP_NODELAY, true)
    .option(ChannelOption.SO_SNDBUF, SEND_BUFFER_SIZE)
    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, CONNECT_TIMEOUT)
    .handler(channelInitializer);
    clientBootstrap = bootstrap;

    ScheduledExecutorService ses = 
            syncManager.getThreadPool().getScheduledExecutor();
    reconnectTask = new SingletonTask(ses, new ConnectTask());
    reconnectTask.reschedule(0, TimeUnit.SECONDS);
}
 

import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
@Override
public void startUp(FloodlightModuleContext context) {
	// thread to do flow reconcile
	ScheduledExecutorService ses = threadPoolService.getScheduledExecutor();
	flowReconcileTask = new SingletonTask(ses, new Runnable() {
		@Override
		public void run() {
			try {
				if (doReconcile()) {
					flowReconcileTask.reschedule(
							FLOW_RECONCILE_DELAY_MILLISEC,
							TimeUnit.MILLISECONDS);
				}
			} catch (Exception e) {
				logger.warn("Exception in doReconcile(): {}", e);
			}
		}
	});

	String packetInName = OFType.PACKET_IN.getClass().getName();
	packetInName = packetInName.substring(packetInName.lastIndexOf('.')+1);
}
 

import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
@Override
public void startUp(FloodlightModuleContext context) {
	clearCurrentTopology();
	// Initialize role to floodlight provider role.
	this.role = floodlightProviderService.getRole();

	ScheduledExecutorService ses = threadPoolService.getScheduledExecutor();
	newInstanceTask = new SingletonTask(ses, new UpdateTopologyWorker());

	if (role != HARole.STANDBY) {
		newInstanceTask.reschedule(TOPOLOGY_COMPUTE_INTERVAL_MS, TimeUnit.MILLISECONDS);
	}

	linkDiscoveryService.addListener(this);
	floodlightProviderService.addOFMessageListener(OFType.PACKET_IN, this);
	floodlightProviderService.addHAListener(this.haListener);
	addRestletRoutable();
}
 

import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
/**
 * Connect to remote servers.  We'll initiate the connection to
 * any nodes with a lower ID so that there will be a single connection
 * between each pair of nodes which we'll use symmetrically
 */
protected void startClients(ChannelPipelineFactory pipelineFactory) {
    final ClientBootstrap bootstrap =
            new ClientBootstrap(
                 new NioClientSocketChannelFactory(bossExecutor,
                                                   workerExecutor));
    bootstrap.setOption("child.reuseAddr", true);
    bootstrap.setOption("child.keepAlive", true);
    bootstrap.setOption("child.tcpNoDelay", true);
    bootstrap.setOption("child.sendBufferSize", SEND_BUFFER_SIZE);
    bootstrap.setOption("child.connectTimeoutMillis", CONNECT_TIMEOUT);
    bootstrap.setPipelineFactory(pipelineFactory);
    clientBootstrap = bootstrap;

    ScheduledExecutorService ses = 
            syncManager.getThreadPool().getScheduledExecutor();
    reconnectTask = new SingletonTask(ses, new ConnectTask());
    reconnectTask.reschedule(0, TimeUnit.SECONDS);
}
 

import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
@Override
public void startUp(FloodlightModuleContext context) {
	clearCurrentTopology();
	// Initialize role to floodlight provider role.
	this.role = floodlightProviderService.getRole();

	ScheduledExecutorService ses = threadPoolService.getScheduledExecutor();
	newInstanceTask = new SingletonTask(ses, new UpdateTopologyWorker());

	if (role != HARole.STANDBY)
		newInstanceTask.reschedule(TOPOLOGY_COMPUTE_INTERVAL_MS,
				TimeUnit.MILLISECONDS);

	linkDiscoveryService.addListener(this);
	floodlightProviderService.addOFMessageListener(OFType.PACKET_IN, this);
	floodlightProviderService.addHAListener(this.haListener);
	addRestletRoutable();
}
 

import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
@Override
public void startUp(FloodlightModuleContext context) {
    clearCurrentTopology();
    // Initialize role to floodlight provider role.
    this.role = floodlightProvider.getRole();

    ScheduledExecutorService ses = threadPool.getScheduledExecutor();
    newInstanceTask = new SingletonTask(ses, new UpdateTopologyWorker());

    if (role != Role.SLAVE)
        newInstanceTask.reschedule(TOPOLOGY_COMPUTE_INTERVAL_MS,
                               TimeUnit.MILLISECONDS);

    linkDiscovery.addListener(this);
    floodlightProvider.addOFMessageListener(OFType.PACKET_IN, this);
    floodlightProvider.addHAListener(this.haListener);
    addRestletRoutable();
}
 

import net.floodlightcontroller.core.util.SingletonTask; //导入依赖的package包/类
/**
 * Connect to remote servers.  We'll initiate the connection to
 * any nodes with a lower ID so that there will be a single connection
 * between each pair of nodes which we'll use symmetrically
 */
protected void startClients(RPCChannelInitializer channelInitializer) {
    final Bootstrap bootstrap = new Bootstrap();
    bootstrap.group(workerGroup)
    .channel(NioSocketChannel.class)
    .option(ChannelOption.SO_REUSEADDR, true)
    .option(ChannelOption.SO_KEEPALIVE, true)
    .option(ChannelOption.TCP_NODELAY, true)
    .option(ChannelOption.SO_SNDBUF, SEND_BUFFER_SIZE)
    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, CONNECT_TIMEOUT)
    .handler(channelInitializer);
    clientBootstrap = bootstrap;

    ScheduledExecutorService ses =
            syncManager.getThreadPool().getScheduledExecutor();
    reconnectTask = new SingletonTask(ses, new ConnectTask());
    reconnectTask.reschedule(0, TimeUnit.SECONDS);
}