[GitHub] [httpcomponents-client] michael-o commented on a change in pull request #352: Optimize ExecSupport.getNextExchangeId()

[GitBox <gi...@apache.org>]

michael-o commented on a change in pull request #352:
URL: https://github.com/apache/httpcomponents-client/pull/352#discussion_r814892020



##########
File path: httpclient5/src/main/java/org/apache/hc/client5/http/impl/ExecSupport.java
##########
@@ -45,7 +45,29 @@ public static long getNextExecNumber() {
     }
 
     public static String getNextExchangeId() {
-        return String.format("ex-%010d", COUNT.incrementAndGet());
+        return createId(COUNT.incrementAndGet());
+    }
+
+    /**
+     * Create an exchange ID.
+     *
+     * Hand rolled equivalent to `String.format("ex-%010d", value)` optimized to reduce
+     * allocation and CPU overhead.
+     */
+    static String createId(long value) {
+        String longString = Long.toString(value);
+        return "ex-" + zeroPad(10 - longString.length()) + longString;

Review comment:
       @carterkozak how?




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