創建另一個任務時取消延遲任務

我目前有一個延遲任務，只要點擊一個按鈕就會運行。單擊此按鈕將布爾值切換爲true，7秒後，延遲任務再次將其設置爲false。創建另一個任務時取消延遲任務

但是，會發生什麼情況是，如果一個人多次單擊該按鈕，布爾值會打開和關閉，打開和關閉等等，因爲延遲的任務堆積如山。如果多次單擊按鈕而不是將所有延遲的任務彼此堆疊在一起，是否有簡單延長延遲任務的方法？

因此，假設一旦點擊按鈕，延遲任務將等待7秒鐘，然後將布爾值從true切換爲false。我該如何更改代碼，以便在延遲任務未執行時再次按下該按鈕時，它將取消上一個任務，並簡單地執行下一個延遲任務（我正在使用這個服務器，因此取消上一個任務可能不會這意味着這是實際的延遲任務，但其他任務）？

@EventHandler 
public void damage (EntityDamageEvent event) { 
    Entity victim = event.getEntity(); 
    if (event instanceof EntityDamageByEntityEvent) { 
     EntityDamageByEntityEvent edbeEvent = (EntityDamageByEntityEvent) event; 
     if(edbeEvent.getDamager() instanceof Player && victim instanceof Player) { 
      EntityDamageByEntityEvent edbeEvent1 = (EntityDamageByEntityEvent) event; 
      Entity attacker = edbeEvent1.getDamager(); 
      //Checks if both players are humans and not NPCS. 
      final Player player = (Player) victim; 
      final Player player2 = (Player) attacker; 
      //Saving the players as the variable Player. 
      Damagelist.add(player); 

      Damagelist.add(player2); 
      //Adds both players to the hashmap to be used by other classes. 
      isDamaged = true; 
      //Toggles the boolean to true. 
      int delay = plugin.getConfig().getInt("StunDuration") * 20; 
      //The above line gets the delay time from the config.yml file. 
      plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() { 
       public void run() {   

        Damagelist.remove(player); 
        Damagelist.remove(player2); 
        //After an x amount of time, removes players from hashmap. 
        isDamaged = false; 
        playeradd = true; 
        //Toggles the booleans around. 
       } 
      }, delay); 
     } 
    } 
}

來源

2012-04-14 Robert Lu

爲了確保事件不會對你可以使用isDamaged變量來驗證，如果代碼應運行相同的傷害事件中運行隨後的時間。

既然你驗證事件之後isDamaged到true你只需要做出對這種價值的情況下儘可能的高，而且如果它是真的，那麼只返回了這將阻止另一個計劃整個方法的檢查正在創建任務。

如果你想停止玩家傷害，那麼你也可以取消整個事件，然後再返回到其他插件，在冷卻期間沒有任何傷害。

// End event, add setCancelled(true), and exit method if the isDamaged modifier is set to true 
if (isDamaged) { 
    event.setCancelled(true); 
    return; 
}

這裏是您的代碼修改，以顯示一個示例使用。

@EventHandler 
public void damage (EntityDamageEvent event) { 
    // Get the victim of the damage event. 
    Entity victim = event.getEntity(); 

    // End event, add setCancelled(true), and exit method if the isDamaged modifier is set to true 
    if (isDamaged) { 
     event.setCancelled(true); 
     return; 
    } 

    if (event instanceof EntityDamageByEntityEvent) { 
     // Get the attacker of the event. 
     EntityDamageByEntityEvent edbeEvent = (EntityDamageByEntityEvent) event; 
     Entity attacker = edbeEvent.getDamager(); 

     // Continue only if both players are humans and not NPCS. 
     if(edbeEvent.getDamager() instanceof Player && victim instanceof Player) { 

      // Saving the players as the variable Player. 
      final Player player = (Player) victim; 
      final Player player2 = (Player) attacker; 

      // Add both players to the hashmap to be used by other classes. 
      Damagelist.add(player); 
      Damagelist.add(player2); 

      // Toggle to true. 
      isDamaged = true; 

      // Get delay time from the config.yml file. 
      int delay = plugin.getConfig().getInt("StunDuration") * 20; 

      // Setup delayed task to end cooldown set under StunDuration. 
      plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() { 
       // Define task to be run by scheduler. 
       public void run() {   
        // After amount of time set by StunDuration, remove players from hashmap. 
        Damagelist.remove(player); 
        Damagelist.remove(player2); 

        // Toggle back to false; 
        isDamaged = false; 
        playeradd = true; 
       } 
      }, delay); 
     } 
    } 
}

來源

2012-07-01 17:44:06

-2

如果您使用自己的線程，這將會容易得多。簡單地擴展Thread，並使用類來實現：

Thread.sleep(timeinmilliseconds);

這樣，調度程序變得更加容易，簡單的線條，其中時間等待可以改變一個變量，如果你想改變它你的代碼。

來源

2012-09-03 02:46:53 JNorr44

創建另一個任務時取消延遲任務

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