From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Minecrell <minecrell@minecrell.net>
Date: Tue, 17 Jul 2018 16:42:17 +0200
Subject: [PATCH] Use asynchronous Log4j 2 loggers


diff --git a/pom.xml b/pom.xml
index bb15d94f1aadf04439f0b9484f91a81440194c43..526a261e93f8be8d2f045d1b8822002b55c11fb9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -93,6 +93,13 @@
             <artifactId>log4j-iostreams</artifactId>
             <scope>compile</scope>
         </dependency>
+        <!-- Paper - Async loggers -->
+        <dependency>
+            <groupId>com.lmax</groupId>
+            <artifactId>disruptor</artifactId>
+            <version>3.4.2</version>
+            <scope>runtime</scope>
+        </dependency>
         <dependency>
             <groupId>org.ow2.asm</groupId>
             <artifactId>asm</artifactId>
diff --git a/src/main/java/com/destroystokyo/paper/log/LogFullPolicy.java b/src/main/java/com/destroystokyo/paper/log/LogFullPolicy.java
new file mode 100644
index 0000000000000000000000000000000000000000..db652a1f7abc80bc751fd94925abaec58ab1a563
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/log/LogFullPolicy.java
@@ -0,0 +1,17 @@
+package com.destroystokyo.paper.log;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.core.async.AsyncQueueFullPolicy;
+import org.apache.logging.log4j.core.async.EventRoute;
+
+public final class LogFullPolicy implements AsyncQueueFullPolicy {
+
+    /*
+     * Prevents log calls being logged out of order when the log queue is full.
+     */
+
+    @Override
+    public EventRoute getRoute(final long backgroundThreadId, final Level level) {
+        return EventRoute.ENQUEUE;
+    }
+}
diff --git a/src/main/resources/log4j2.component.properties b/src/main/resources/log4j2.component.properties
index 0694b21465fb9e4164e71862ff24b62241b191f2..30efeb5faf8e7faccf1b252fa0ed6a9fc31c40a7 100644
--- a/src/main/resources/log4j2.component.properties
+++ b/src/main/resources/log4j2.component.properties
@@ -1 +1,3 @@
+Log4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector
+log4j2.AsyncQueueFullPolicy="com.destroystokyo.paper.log.LogFullPolicy"
 log4j.skipJansi=true