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8200788: Optimal initial capacity of java.lang.VarHandle.AccessMode.methodNameToAccessMode

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Reviewed-by: redestad
This commit is contained in:
Ivan Gerasimov 2018-04-07 17:07:13 -07:00
parent 999296bab2
commit 9fe989cc39
3 changed files with 52 additions and 5 deletions
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12
src/java.base/share/classes/java/lang/invoke/VarHandle.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2018, 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
@ -1788,10 +1788,12 @@ public abstract class VarHandle {
static final Map<String, AccessMode> methodNameToAccessMode;
static {
// Initial capacity of # values is sufficient to avoid resizes
// for the smallest table size (32)
methodNameToAccessMode = new HashMap<>(AccessMode.values().length);
for (AccessMode am : AccessMode.values()) {
AccessMode[] values = AccessMode.values();
// Initial capacity of # values divided by the load factor is sufficient
// to avoid resizes for the smallest table size (64)
int initialCapacity = (int)(values.length / 0.75f) + 1;
methodNameToAccessMode = new HashMap<>(initialCapacity);
for (AccessMode am : values) {
methodNameToAccessMode.put(am.methodName, am);
}
}