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Use substring instead of replaceFirst in OAuth2AuthorizationConsent #1223

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Use substring instead of replaceFirst in OAuth2AuthorizationConsent #1223

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Using substring instead of replaceFirst
heartape May 22, 2023
e2b96b8
Merge branch 'spring-projects:main' into gh-1222
heartape May 27, 2023
71c3ae6
revert CONTRIBUTING.adoc and OidcLogoutAuthenticationConverter.java
heartape May 27, 2023
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2 changes: 1 addition & 1 deletion .../org/springframework/security/oauth2/server/authorization/OAuth2AuthorizationConsent.java
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,7 @@ public Set<String> getScopes() {
Set<String> authorities = new HashSet<>();
for (GrantedAuthority authority : getAuthorities()) {
if (authority.getAuthority().startsWith(AUTHORITIES_SCOPE_PREFIX)) {
authorities.add(authority.getAuthority().replaceFirst(AUTHORITIES_SCOPE_PREFIX, ""));
authorities.add(authority.getAuthority().substring(AUTHORITIES_SCOPE_PREFIX.length()));
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I conducted a simple test and achieved a 40 times performance improvement.

How did you conduct the test?

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@heartape heartape May 27, 2023 •
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This is all the testing information：

public static void main(String[] args) {
    String scope = "SCOPE_";
    String email = "SCOPE_email";
    int count = 10000000;

    long start1 = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
        String s = email.replaceFirst(scope, "");
    }
    long end1 = System.currentTimeMillis();
    System.out.println("replaceFirst : " + (end1 - start1));

    long start2 = System.currentTimeMillis();
    for (int i = 0; i < count; i++) {
        String s = email.substring(scope.length());
    }
    long end2 = System.currentTimeMillis();
    System.out.println("substring : " + (end2 - start2));
    System.out.println("count : " + count);
}
windows(8c16t 32G) idea 
java version "17.0.3.1" 2022-04-22 LTS
Java(TM) SE Runtime Environment (build 17.0.3.1+2-LTS-6)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.3.1+2-LTS-6, mixed mode, sharing)

result:
replaceFirst : 2383
substring : 69
count : 10000000

###############################################################

centos7 vm(2c 2G)  command line 
java version "17.0.6" 2023-01-17 LTS
Java(TM) SE Runtime Environment (build 17.0.6+9-LTS-190)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.6+9-LTS-190, mixed mode, sharing)

result:
replaceFirst : 2856
substring : 107
count : 10000000

}
}
return authorities;
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