上一篇文章《Monkey源码分析之运行流程》给出了monkey运行的整个流程，让我们有一个概貌，那么往后的文章我们会尝试进一步的阐述相关的一些知识点。
这里先把整个monkey类的结构图给出来供大家参考，该图源自网上（我自己的backbook pro上没有安装OmniGraffle工具，55美金，不舍得，所以直接贴网上的)
图中有几点需要注意下的：
本文我们重点是以处理来来自网络sokcet也就是monkeyrunner的命令为例子来阐述事件源是怎么处理的，其他的源大同小异。
在开始之前我们需要先去了解几个基础类，这样子我们才方便分析。
我们在获取了事件源之后，会把这些事件排队放入一个队列，然后其他地方就可以去把队列里面的事件取出来进一步进行处理了。那么这里我们先看下维护这个事件队列的相应代码：
public static interface CommandQueue { /** * Enqueue an event to be returned later. This allows a * command to return multiple events. Commands using the * command queue still have to return a valid event from their * translateCommand method. The returned command will be * executed before anything put into the queue. * * @param e the event to be enqueued. */ public void enqueueEvent(MonkeyEvent e); }; // Queue of Events to be processed. This allows commands to push // multiple events into the queue to be processed. private static class CommandQueueImpl implements CommandQueue{ private final Queue<MonkeyEvent> queuedEvents = new LinkedList<MonkeyEvent>(); public void enqueueEvent(MonkeyEvent e) { queuedEvents.offer(e); } /** * Get the next queued event to excecute. * * @return the next event, or null if there aren't any more. */ public MonkeyEvent getNextQueuedEvent() { return queuedEvents.poll(); } }; 接口CommandQueue只定义个了一个方法enqueueEvent,由实现类CommandQueueImpl来实现，而实现类维护了一个MonkeyEvent类型的由LinkedList实现的队列quequeEvents,然后实现了两个方法来分别往这个队列里面放和取事件。挺简单的实现，这里主要是要提醒大家queueEvents这个队列的重要性。这里要注意的是MonkeyEventScript和monkeyEventRandom这两个事件源维护队列的类稍微有些不一样，用的是MonkeyEventQueue这个类，但是其实这个类也是继承自上面描述的LinkedList的，所以原理是一样的。
最后创建和维护一个CommandQueueImple这个实现类的一个实例commandQueque来转被对里面的quequeEvents进行管理。
private final CommandQueueImpl commandQueue = new CommandQueueImpl();
下一个我们需要了解的基础内部类就是MonkeCommand。从数据源过来的命令都是一串字符串，我们需要把它转换成对应的monkey事件并存入到我们上面提到的由CommandQueque维护的事件队列quequeEvents里面。首先我们看下MonkeyCommand这个接口：
/** * Interface that MonkeyCommands must implement. */ public interface MonkeyCommand { /** * Translate the command line into a sequence of MonkeyEvents. * * @param command the command line. * @param queue the command queue. * @return MonkeyCommandReturn indicating what happened. */ MonkeyCommandReturn translateCommand(List<String> command, CommandQueue queue); } 它只定义了一个实现类需要实现的方法translateCommand，从它的描述和接受的的参数可以知道，这个方法要做的事情就是把从事件源接受到的字符串命令转换成上面说的CommandQueue类型维护的那个eventQueues。以monkeyrunner发过来的press这个命令为例子，传过来给monkey的字串是"press KEY_COKDE"(请查看《MonkeyRunner源码分析之与Android设备通讯方式》）
针对每一个命令都会有一个对应的MonkeyCommand的实现类来做真正的字串到事件的翻译工作，以刚才提到的press这个命令为例子，我们看下它的实现代码：
/** * Command to "press" a buttons (Sends an up and down key event.) */ private static class PressCommand implements MonkeyCommand { // press keycode public MonkeyCommandReturn translateCommand(List<String> command, CommandQueue queue) { if (command.size() == 2) { int keyCode = getKeyCode(command.get(1)); if (keyCode < 0) { // Ok, you gave us something bad. Log.e(TAG, "Can't find keyname: " + command.get(1)); return EARG; } queue.enqueueEvent(new MonkeyKeyEvent(KeyEvent.ACTION_DOWN, keyCode)); queue.enqueueEvent(new MonkeyKeyEvent(KeyEvent.ACTION_UP, keyCode)); return OK; } return EARG; } }以monkeyrunner过来的'press KEY_CODE'为例分析这段代码： private static final Map<String, MonkeyCommand> COMMAND_MAP = new HashMap<String, MonkeyCommand>(); static { // Add in all the commands we support COMMAND_MAP.put("flip", new FlipCommand()); COMMAND_MAP.put("touch", new TouchCommand()); COMMAND_MAP.put("trackball", new TrackballCommand()); COMMAND_MAP.put("key", new KeyCommand()); COMMAND_MAP.put("sleep", new SleepCommand()); COMMAND_MAP.put("wake", new WakeCommand()); COMMAND_MAP.put("tap", new TapCommand()); COMMAND_MAP.put("press", new PressCommand()); COMMAND_MAP.put("type", new TypeCommand()); COMMAND_MAP.put("listvar", new MonkeySourceNetworkVars.ListVarCommand()); COMMAND_MAP.put("getvar", new MonkeySourceNetworkVars.GetVarCommand()); COMMAND_MAP.put("listviews", new MonkeySourceNetworkViews.ListViewsCommand()); COMMAND_MAP.put("queryview", new MonkeySourceNetworkViews.QueryViewCommand()); COMMAND_MAP.put("getrootview", new MonkeySourceNetworkViews.GetRootViewCommand()); COMMAND_MAP.put("getviewswithtext", new MonkeySourceNetworkViews.GetViewsWithTextCommand()); COMMAND_MAP.put("deferreturn", new DeferReturnCommand()); }终于到了如何获取事件的分析了，我们继续以MonkeySourceNetwork这个处理monkeyrunner过来的网络命令为例子，看下它是如何处理monkeyrunner过来的命令的。我们先看下它实现的接口类MonkeyEventSource
/** * event source interface */ public interface MonkeyEventSource { /** * @return the next monkey event from the source */ public MonkeyEvent getNextEvent(); /** * set verbose to allow different level of log * * @param verbose output mode? 1= verbose, 2=very verbose */ public void setVerbose(int verbose); /** * check whether precondition is satisfied * * @return false if something fails, e.g. factor failure in random source or * file can not open from script source etc */ public boolean validate(); } public MonkeySourceNetwork(int port) throws IOException { // Only bind this to local host. This means that you can only // talk to the monkey locally, or though adb port forwarding. serverSocket = new ServerSocket(port, 0, // default backlog InetAddress.getLocalHost()); }所做的事情就是通过指定的端口实例化一个ServerSocket,这里要注意它绑定的只是本地主机地址，意思是说只有本地的socket连接或者通过端口转发连过来的adb端口（也就是我们这篇文章关注的monkeyrunner启动的那个adb）才会被接受。 这里只是实例化了一个socket，现在为止还没有真正启动起来的，也就是说还没有开始真正的启动对指定端口的监听的。真正开始监听是startServer这个方法触发的：
/** * Start a network server listening on the specified port. The * network protocol is a line oriented protocol, where each line * is a different command that can be run. * * @param port the port to listen on */ private void startServer() throws IOException { clientSocket = serverSocket.accept(); // At this point, we have a client connected. // Attach the accessibility listeners so that we can start receiving // view events. Do this before wake so we can catch the wake event // if possible. MonkeySourceNetworkViews.setup(); // Wake the device up in preparation for doing some commands. wake(); input = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); // auto-flush output = new PrintWriter(clientSocket.getOutputStream(), true); }这里除了开始监听端口之外，还如monkeyrunner对端口读写的情况一样，维护和实例化了input和output这两个成员变量来专门对端口数据进行操作。 public MonkeyEvent getNextEvent() { if (!started) { try { startServer(); } catch (IOException e) { Log.e(TAG, "Got IOException from server", e); return null; } started = true; } // Now, get the next command. This call may block, but that's OK try { while (true) { // Check to see if we have any events queued up. If // we do, use those until we have no more. Then get // more input from the user. MonkeyEvent queuedEvent = commandQueue.getNextQueuedEvent(); if (queuedEvent != null) { // dispatch the event return queuedEvent; } // Check to see if we have any returns that have been deferred. If so, now that // we've run the queued commands, wait for the given event to happen (or the timeout // to be reached), and handle the deferred MonkeyCommandReturn. if (deferredReturn != null) { Log.d(TAG, "Waiting for event"); MonkeyCommandReturn ret = deferredReturn.waitForEvent(); deferredReturn = null; handleReturn(ret); } String command = input.readLine(); if (command == null) { Log.d(TAG, "Connection dropped."); // Treat this exactly the same as if the user had // ended the session cleanly with a done commant. command = DONE; } if (DONE.equals(command)) { // stop the server so it can accept new connections try { stopServer(); } catch (IOException e) { Log.e(TAG, "Got IOException shutting down!", e); return null; } // return a noop event so we keep executing the main // loop return new MonkeyNoopEvent(); } // Do quit checking here if (QUIT.equals(command)) { // then we're done Log.d(TAG, "Quit requested"); // let the host know the command ran OK returnOk(); return null; } // Do comment checking here. Comments aren't a // command, so we don't echo anything back to the // user. if (command.startsWith("#")) { // keep going continue; } // Translate the command line. This will handle returning error/ok to the user translateCommand(command); } } catch (IOException e) { Log.e(TAG, "Exception: ", e); return null; } }有了以上介绍的那些背景知识，这段代码的理解就不会太费力了，我这里大概描述下： /** * Translate the given command line into a MonkeyEvent. * * @param commandLine the full command line given. */ private void translateCommand(String commandLine) { Log.d(TAG, "translateCommand: " + commandLine); List<String> parts = commandLineSplit(commandLine); if (parts.size() > 0) { MonkeyCommand command = COMMAND_MAP.get(parts.get(0)); if (command != null) { MonkeyCommandReturn ret = command.translateCommand(parts, commandQueue); handleReturn(ret); } } }很简单，就是获取monkeyunner进来的命令字串列表的的第一个值,然后通过上面的COMMAND_MAP把字串转换成对应的MonkeyCommand实现类，然后调用其tranlsateCommand把该字串命令翻译成对应的MonkeyEvent并存储到事件队列。COMMAND_MAP.put("press", new PressCommand());所以调用的就是PressCommand这个MonkeyCommand接口实现类的translateCommand方法来把press这个命令转换成对应的MonkeyKeyEvent了。
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