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https://issues.apache.org/jira/browse/MJARSIGNER-72?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17795798#comment-17795798
 ] 

ASF GitHub Bot commented on MJARSIGNER-72:
------------------------------------------

schedin commented on code in PR #18:
URL: 
https://github.com/apache/maven-jarsigner-plugin/pull/18#discussion_r1424124469


##########
src/main/java/org/apache/maven/plugins/jarsigner/AbstractJarsignerMojo.java:
##########
@@ -279,65 +280,70 @@ public final void execute() throws MojoExecutionException 
{
             jarSigner.setToolchain(toolchain);
         }
 
-        int processed = 0;
+        List<File> archives = findJarfiles();
+        processArchives(archives);
+        getLog().info(getMessage("processed", archives.size()));
+    }
 
+    /**
+     * Finds all jar files, by looking at the Maven project and user 
configuration.
+     *
+     * @return a List of File objects
+     * @throws MojoExecutionException if it was not possible to build a list 
of jar files.
+     */
+    private List<File> findJarfiles() throws MojoExecutionException {

Review Comment:
   Once again the diff on GitHub displays like I have changed the entire 
function. View the diff from an IDE to easier see what rows I have only 
re-indented.





> Parallel signing for increased speed
> ------------------------------------
>
>                 Key: MJARSIGNER-72
>                 URL: https://issues.apache.org/jira/browse/MJARSIGNER-72
>             Project: Maven Jar Signer Plugin
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Lennart Schedin
>            Priority: Minor
>              Labels: performance
>
> *Background:*
> As of June 1 2023, a new industry standard mandates the storage of private 
> keys used for code signing on external hardware devices. Refer to 
> [https://knowledge.digicert.com/general-information/new-private-key-storage-requirement-for-standard-code-signing-certificates-november-2022]
>  for details. Various devices, from the Thales SafeNet USB eToken (about 
> $30), Yubico YubiHSM 2 FIPS (about €1000) up to Thales Luna S700 Series 
> (about €30000) can store these keys. Cloud-based HSM solutions (like DigiCert 
> KeyLocker ($90/year)) also exist.
>  
> This ticket primarily targets HSM as a service but could benefit network 
> attached HSM solutions as well.
>  
> *Problem:*
> Using the {{jarsigner:sign}} goal it is possible to specify 
> {{{}archiveDirectory{}}}, that points to a directory with many jar files. 
> This is useful for signing every dependency the project has.
>  
> Using the DigiCert Keylocker HSM as a service I measured that it took 240 
> seconds to sign 128 jar files. I was in Sweden and the DigiCert Keylocker 
> service is in USA. The response time of server is about 500 to 700 ms 
> (without any login and without any signing).
>  
> I created a quick parallel hack (using the Linux command parallel) that used 
> 8 threads and it took only 31 seconds. That is: for this specific HSM service 
> it scales linearly with the number of threads used.
>  
> *To implement:*
> I propose to implement a parallelization for maven-jarsigner-plugin that can 
> be used when signing many jar files at once.
>  
> The configuration for this could be a new parameter named {{threadCount}} 
> (with user property {{{}jarsigner.threadCount{}}}) with default to 1 (no 
> parallelization).



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