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8185093: Expensive multi-core choke point when any graphics objects are created

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Reviewed-by: prr, flar
This commit is contained in:
Sergey Bylokhov 2017-08-04 18:39:23 -07:00
parent 5b641597ae
commit af3dc52333
1 changed files with 49 additions and 43 deletions
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26
jdk/src/java.desktop/share/classes/java/awt/GraphicsEnvironment.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -54,7 +54,6 @@ import sun.security.action.GetPropertyAction;
*/
public abstract class GraphicsEnvironment {
private static GraphicsEnvironment localEnv;
/**
* The headless state of the Toolkit and GraphicsEnvironment
@ -74,16 +73,14 @@ public abstract class GraphicsEnvironment {
}
/**
* Returns the local {@code GraphicsEnvironment}.
* @return the local {@code GraphicsEnvironment}
* Lazy initialization of local graphics environment using holder idiom.
*/
public static synchronized GraphicsEnvironment getLocalGraphicsEnvironment() {
if (localEnv == null) {
localEnv = createGE();
}
private static final class LocalGE {
return localEnv;
}
/**
* The instance of the local {@code GraphicsEnvironment}.
*/
static final GraphicsEnvironment INSTANCE = createGE();
/**
* Creates and returns the GraphicsEnvironment, according to the
@ -122,6 +119,15 @@ public abstract class GraphicsEnvironment {
}
return ge;
}
}
/**
* Returns the local {@code GraphicsEnvironment}.
* @return the local {@code GraphicsEnvironment}
*/
public static GraphicsEnvironment getLocalGraphicsEnvironment() {
return LocalGE.INSTANCE;
}
/**
* Tests whether or not a display, keyboard, and mouse can be