MDController.java 中的start方法,创建了SwitchConnectionHandlerImpl实例

SwitchConnectionHandlerImpl switchConnectionHandler = new SwitchConnectionHandlerImpl();

在SwitchConnectionHandlerImpl从命名理解即为交换机连接处理,在其构造方法中创建了QueueProcessorLightImpl实例。随后在start方法中调用了init方法对SwitchConnectionHandlerImpl进行初始化,该过程中传递给OF协议消息处理的上下行处理器,同时调用了QueueProcessorLightImpl的init方法,该方法创建了3个线程池,分别是processorPool,harvesterPool,finisherPool,用来处理消息,传递消息及处理消息处理结果。

public void init() {
int ticketQueueCapacity = 1500;
ticketQueue = new ArrayBlockingQueue<>(ticketQueueCapacity);
/*
* TODO FIXME - DOES THIS REALLY NEED TO BE CONCURRENT? Can we figure out
* a better lifecycle? Why does this have to be a Set?
*/
messageSources = new CopyOnWriteArraySet<>(); processorPool = new ThreadPoolLoggingExecutor(processingPoolSize, processingPoolSize, 0,
TimeUnit.MILLISECONDS,
new ArrayBlockingQueue<Runnable>(ticketQueueCapacity),
"OFmsgProcessor"); // 负责处理消息
// force blocking when pool queue is full
processorPool.setRejectedExecutionHandler(new RejectedExecutionHandler() {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
try {
executor.getQueue().put(r);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new IllegalStateException(e);
}
}
}); harvesterPool = new ThreadPoolLoggingExecutor(1, 1, 0,
TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1), "OFmsgHarvester"); // 负责消息传递
finisherPool = new ThreadPoolLoggingExecutor(1, 1, 0,
TimeUnit.MILLISECONDS, new ArrayBlockingQueue<Runnable>(1), "OFmsgFinisher"); // 处理消息转译完成
finisher = new TicketFinisherImpl(
ticketQueue, popListenersMapping); // OF消息处理结果将从ticketQueue中获取,目前由于为空,因此处于阻塞状态
finisherPool.execute(finisher); harvester = new QueueKeeperHarvester<OfHeader>(this, messageSources);
harvesterPool.execute(harvester); ticketProcessorFactory = new TicketProcessorFactoryImpl(); // OF消息处理工厂
ticketProcessorFactory.setTranslatorMapping(translatorMapping);
ticketProcessorFactory.setSpy(messageSpy);
ticketProcessorFactory.setTicketFinisher(finisher);
}

其中harvester是串联起前后消息传递的重要手段,如下

harvester = new QueueKeeperHarvester<OfHeader>(this, messageSources);

创建给harvest时,传入的参数分别是QueueProcessorLightImpl实例本身与一个装载OF消息的集合,harsvert从集合中取出单个消息进入QueueProcessorLightImpl实例的ticket处理流程中。如下:

 boolean starving = true;
for (QueueKeeper<IN> source : messageSources) {
QueueItem<IN> qItem = source.poll();
if (qItem != null) {
starving = false;
enqueuer.enqueueQueueItem(qItem); // 调用即为QueueProcessorLightImpl中的enqueueQueueItem方法
}
}

QueueProcessorLightImpl中enqueueQueueItem方法如下:

@Override
public void enqueueQueueItem(QueueItem<OfHeader> queueItem) {
messageSpy.spyMessage(queueItem.getMessage(), STATISTIC_GROUP.FROM_SWITCH_ENQUEUED);
TicketImpl<OfHeader, DataObject> ticket = new TicketImpl<>(); // 输入为OF消息,输出为MD-SAL消息
ticket.setConductor(queueItem.getConnectionConductor());
ticket.setMessage(queueItem.getMessage());
ticket.setQueueType(queueItem.getQueueType()); LOG.trace("ticket scheduling: {}, ticket: {}",
queueItem.getMessage().getImplementedInterface().getSimpleName(),
System.identityHashCode(queueItem));
scheduleTicket(ticket); // 进入线程处理
}

scheduleTicket方法将根据queue类型来选择线程,关于queue类型可参见《OpenDaylight OpenFlow Plugin 过载保护》,如下:

private void scheduleTicket(Ticket<OfHeader, DataObject> ticket) {
switch (ticket.getQueueType()) {
case DEFAULT: // 处理非pktin消息
Runnable ticketProcessor = ticketProcessorFactory.createProcessor(ticket); // 创建消息处理任务
processorPool.execute(ticketProcessor); // 放入处理线程池
try {
ticketQueue.put(ticket); // 结果放入队列
} catch (InterruptedException e) {
LOG.warn("enqeueue of unordered message ticket failed", e);
}
break;
case UNORDERED: // 处理pktin消息
Runnable ticketProcessorSync = ticketProcessorFactory.createSyncProcessor(ticket);
processorPool.execute(ticketProcessorSync);
break;
default:
LOG.warn("unsupported enqueue type: {}", ticket.getQueueType());
}
}

消息处理如下:

Runnable ticketProcessor = new Runnable() {
@Override
public void run() {
LOG.debug("message received, type: {}", ticket.getMessage().getImplementedInterface().getSimpleName());
List<DataObject> translate;
try {
translate = translate(ticket); // 翻译OF消息
ticket.getResult().set(translate); // 异步结果
ticket.setDirectResult(translate); // 直接返回结果
// spying on result
if (spy != null) {
spy.spyIn(ticket.getMessage());
for (DataObject outMessage : translate) {
spy.spyOut(outMessage);
}
}
} catch (Exception e) {
LOG.warn("translation problem: {}", e.getMessage());
ticket.getResult().setException(e);
}
LOG.debug("message processing done (type: {}, ticket: {})",
ticket.getMessage().getImplementedInterface().getSimpleName(),
System.identityHashCode(ticket));
}
};

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