More object update checks

src/main/java/snw/kookbc/impl/event/EventFactory.java

@@ -43,13 +43,15 @@
 import snw.kookbc.impl.serializer.event.role.RoleDeleteEventDeserializer;
 import snw.kookbc.impl.serializer.event.role.RoleInfoUpdateEventDeserializer;
 import snw.kookbc.impl.serializer.event.user.*;
+import snw.kookbc.impl.storage.EntityStorage;
 
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.BiPredicate;
 
+import static snw.kookbc.impl.serializer.EventDeserializeUtils.getBody;
 import static snw.kookbc.util.GsonUtil.get;
 import static snw.kookbc.util.GsonUtil.has;
 
@@ -64,18 +66,37 @@ private static BiPredicate<EventFactory, JsonObject> subscribed(Class<? extends
         return (eventFactory, json) -> eventFactory.eventManager.isSubscribed(type);
     }
 
+    private static BiPredicate<EventFactory, JsonObject> cachedChannel() {
+        return (eventFactory, jsonObject) -> {
+            final JsonObject body = getBody(jsonObject);
+            final String channelId = get(body, "channel_id").getAsString();
+            final EntityStorage storage = eventFactory.client.getStorage();
+            return storage.containsChannel(channelId);
+        };
+    }
+
+    public static BiPredicate<EventFactory, JsonObject> cachedGuild() {
+        return (eventFactory, jsonObject) -> {
+            final JsonObject body = getBody(jsonObject);
+            final String channelId = get(body, "id").getAsString();
+            final EntityStorage storage = eventFactory.client.getStorage();
+            return storage.containsChannel(channelId);
+        };
+    }
+
     static {
         FORCE_CREATE_TYPES = new HashSet<Class<? extends Event>>() {
             {
                 add(ChannelMessageEvent.class);
                 add(PrivateMessageReceivedEvent.class);
-                add(ChannelInfoUpdateEvent.class); // what #85 did
             }
         };
         CREATE_CONDITIONS = new HashMap<Class<? extends Event>, BiPredicate<EventFactory, JsonObject>>() {
             {
                 put(ChannelMessageDeleteEvent.class, subscribed(ChannelMessageEvent.class));
                 put(PrivateMessageDeleteEvent.class, subscribed(PrivateMessageReceivedEvent.class));
+                put(ChannelInfoUpdateEvent.class, cachedChannel()); // what #85 did
+                put(GuildInfoUpdateEvent.class, cachedGuild());
             }
         };
     }

src/main/java/snw/kookbc/impl/serializer/EventDeserializeUtils.java

@@ -0,0 +1,11 @@
+package snw.kookbc.impl.serializer;
+
+import com.google.gson.JsonObject;
+
+import static snw.kookbc.util.GsonUtil.get;
+
+public class EventDeserializeUtils {
+    public static JsonObject getBody(JsonObject object) {
+        return get(get(object, "extra").getAsJsonObject(), "body").getAsJsonObject();
+    }
+}

src/main/java/snw/kookbc/impl/serializer/event/NormalEventDeserializer.java

@@ -26,6 +26,7 @@
 
 import java.lang.reflect.Type;
 
+import static snw.kookbc.impl.serializer.EventDeserializeUtils.getBody;
 import static snw.kookbc.util.GsonUtil.get;
 
 public abstract class NormalEventDeserializer<T extends Event> extends BaseEventDeserializer<T> {
@@ -41,7 +42,7 @@ protected T deserialize(JsonObject object, Type type, JsonDeserializationContext
                 type,
                 ctx,
                 get(object, "msg_timestamp").getAsLong(),
-                get(get(object, "extra").getAsJsonObject(), "body").getAsJsonObject()
+                getBody(object)
         );
     }
 

src/main/java/snw/kookbc/impl/storage/EntityStorage.java

@@ -255,6 +255,10 @@ public void removeEmoji(CustomEmoji emoji) {
         emojis.invalidate(emoji.getId());
     }
 
+    public boolean containsChannel(String id) {
+        return channels.asMap().containsKey(id);
+    }
+
     private static Caffeine<Object, Object> newCaffeineBuilderWithWeakRef() {
         return Caffeine.newBuilder()
                 .weakValues()