event manager

mirai-core/src/main/java/net/mamoe/mirai/event/Cancelable.java

@@ -1,7 +1,13 @@
 package net.mamoe.mirai.event;
 
+import lombok.Getter;
+
 interface Cancelable {
 
-    void setCancel(boolean value);
 
+    boolean isCancelled();
+
+    void setCancelled();
+
+    void setCancelled(boolean forceCancel);
 }

mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEvent.java

@@ -1,5 +1,28 @@
 package net.mamoe.mirai.event;
 
+import net.mamoe.jpre.event.Cancellable;
+import net.mamoe.mirai.utils.EventException;
+
 public abstract class MiraiEvent {
 
+    private boolean cancelled;
+
+    public boolean isCancelled() {
+        if (!(this instanceof Cancellable)) {
+            throw new EventException("Event is not Cancellable");
+        }
+        return this.cancelled;
+    }
+
+    public void setCancelled() {
+        setCancelled(true);
+    }
+
+    public void setCancelled(boolean value) {
+        if (!(this instanceof Cancellable)) {
+            throw new EventException("Event is not Cancellable");
+        }
+        this.cancelled = value;
+    }
+
 }

mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventManager.java

@@ -3,12 +3,10 @@ package net.mamoe.mirai.event;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
 public class MiraiEventManager {
     private MiraiEventManager(){
@@ -39,11 +37,37 @@ public class MiraiEventManager {
         this.registerUntil(hook,(a) -> false);
     }
 
+
+    public void boardcastEvent(MiraiEvent event){
+        if(hooks.containsKey(event.getClass())){
+            hooks.put(event.getClass(),
+                    hooks.get(event.getClass())
+                    .stream()
+                    .sorted(Comparator.comparingInt(MiraiEventConsumer::getPriority))
+                    .dropWhile(a -> a.accept(event))
+                    .collect(Collectors.toList())
+            );
+        }
+    }
+
 }
 @Data
 @AllArgsConstructor
 class MiraiEventConsumer<T extends MiraiEvent>{
     private MiraiEventHook<T> hook;
     private Predicate<T> remove;
+
+
+    public int getPriority(){
+        return hook.getPreferences().getPriority();
+    }
+
+    @SuppressWarnings("unchecked")
+    public boolean accept(MiraiEvent event) {
+        if(!(event instanceof Cancelable && event.isCancelled() && hook.getPreferences().isIgnoreCanceled())){
+            hook.getHandler().accept((T) event);
+        }
+        return remove.test((T)event);
+    }
 }
 

mirai-core/src/main/java/net/mamoe/mirai/utils/EventException.java

@@ -0,0 +1,53 @@
+package net.mamoe.mirai.utils;
+
+public class EventException extends RuntimeException {
+    private final Throwable cause;
+
+    /**
+     * Constructs a new EventException based on the given Exception
+     *
+     * @param throwable Exception that triggered this Exception
+     */
+    public EventException(Throwable throwable) {
+        cause = throwable;
+    }
+
+    /**
+     * Constructs a new EventException
+     */
+    public EventException() {
+        cause = null;
+    }
+
+    /**
+     * Constructs a new EventException with the given message
+     *
+     * @param cause   The exception that caused this
+     * @param message The message
+     */
+    public EventException(Throwable cause, String message) {
+        super(message);
+        this.cause = cause;
+    }
+
+    /**
+     * Constructs a new EventException with the given message
+     *
+     * @param message The message
+     */
+    public EventException(String message) {
+        super(message);
+        cause = null;
+    }
+
+    /**
+     * If applicable, returns the Exception that triggered this Exception
+     *
+     * @return Inner exception, or null if one does not exist
+     */
+    @Override
+    public Throwable getCause() {
+        return cause;
+    }
+}
+