Add DynamicProxyNormalization

CHANGELOG.md

@@ -30,6 +30,7 @@ Dropping a requirement of a major version of a dependency is a new contract.
 - Add `MutableJvmSymbol`, `JfrFilter.Builder.symbolModifier` and `MultiJfrFilter.Builder.symbolModifier`.
   They allow for mutating JVM symbols in JFR files, e.g. to normalize dynamic proxy names or lambda names.
   This way, the same JVM code can be profiled multiple times and resulting JFRs can be merged or diffed.
+- Add `DynamicProxyNormalization`.
 
 ## [4.4.0] - 2024-01-18
 [4.4.0]: https://github.com/atlassian/report/compare/release-4.3.0...release-4.4.0

src/main/kotlin/com/atlassian/performance/tools/report/api/jfr/DynamicProxyNormalization.kt

@@ -0,0 +1,20 @@
+package com.atlassian.performance.tools.report.api.jfr
+
+import java.nio.ByteBuffer
+import java.util.function.Consumer
+
+class DynamicProxyNormalization : Consumer<MutableJvmSymbol> {
+
+    private val proxyClassName = Regex("\\\$Proxy[0-9]")
+    private val proxyPackageName = Regex("proxy[0-9]")
+
+    override fun accept(symbol: MutableJvmSymbol) {
+        val symbolString = symbol.toString()
+        if (symbolString.contains(proxyClassName) || symbolString.contains(proxyPackageName)) {
+            val newSymbol = "PROXY".padEnd(symbol.payload.size, '_')
+            ByteBuffer.wrap(symbol.payload).put(newSymbol.toByteArray())
+        }
+    }
+}
+
+

src/test/kotlin/com/atlassian/performance/tools/report/jfr/JfrFilterTest.kt

@@ -1,5 +1,6 @@
 package com.atlassian.performance.tools.report.jfr
 
+import com.atlassian.performance.tools.report.api.jfr.DynamicProxyNormalization
 import com.atlassian.performance.tools.report.api.jfr.JfrFilter
 import com.atlassian.performance.tools.report.api.jfr.MutableJvmSymbol
 import com.atlassian.performance.tools.report.api.result.CompressedResult
@@ -148,7 +149,7 @@ class JfrFilterTest {
         assertThat(before.uniqueSymbols).containsAll(proxies)
         // when
         val output = JfrFilter.Builder()
-            .symbolModifier(Consumer(this::normalizeDynamicProxy))
+            .symbolModifier(DynamicProxyNormalization())
             .build()
             .filter(input)