6th Chapter 6 "Monkeyrunner Source Analysis" Monkey principle-Event Source-Event Source Overview-command queue

After the event source obtains the string command and translates it into the corresponding Monkeyevent event, these events are queued into a queue maintained by the event source. Then other places such as the Monkey Class of the Runmonkeycycles method can go to the queue of events to be taken out for further processing. So here we first look at the class diagram of the command queue that belongs to the monkeysourcenetwork inner class:

Figure 6-6-1 Command Queue class diagram

The entire inheritance is clear and concise, and the Commandqueue interface defines a enqueueevent method to append events to the queue. Implementation class Commandqueueimpl implements this method and provides an additional getnextevent method to get events from the event queue queuedevents that it maintains.

Because the internal interface and the internal class of code is not much, so we will analyze the following:

481 public static interface Commandqueue {482/**483 * Enqueue A event to be returned later.  This allows a484 * command to return multiple events. Commands using the485 * command queue still has to return a valid event from their486 * Translatecomman  D method.  The returned command would be487 * executed before anything put into the queue.488 *489 * @param E The event to being enqueued.490 */491 public void enqueueevent (Monkeyevent e); 492};493 494//Qu  Eue of Events to be processed. This allows commands to push495//multiple events into the queue to be processed.496 private static class Command Queueimpl implements commandqueue{497 private final queue<monkeyevent> queuedevents = new Linkedlist<monk Eyevent> (); 498 499 public void Enqueueevent (Monkeyevent e) {queuedevents.offer (e); 501} 502 503/**504 * Get the NEXT queued event to excecute.505 *506 * @return The next event, or null if there aren ' t any more.507     */508 public monkeyevent Getnextqueuedevent () {509 return queuedevents.poll (); 510}511 };

code 6-6-1 commandqueue and Commandqueueimpl

• 497 rows: Instantiates an event queue composed of Monkeyevent queuedevents
• 499-501: Call the queue's offer method to add an event to the event queue
• 508-510: Call Queue Poll method to take out an event in a queue and return

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6th Chapter 6 "Monkeyrunner Source anatomy" Monkey Principle Analysis-Event Source-Event Source Overview-command queue