instrumentation-api-incubator: make jflex task configuration-cache friendly

Author: trask

instrumentation-api-incubator/build.gradle.kts

@@ -1,6 +1,4 @@
 plugins {
-  id("org.xbib.gradle.plugin.jflex")
-
   id("otel.java-conventions")
   id("otel.animalsniffer-conventions")
   id("otel.jacoco-conventions")
@@ -10,7 +8,11 @@ plugins {
 
 group = "io.opentelemetry.instrumentation"
 
+val jflex = configurations.create("jflex")
+
 dependencies {
+  jflex("de.jflex:jflex:1.9.1")
+
   api("io.opentelemetry.semconv:opentelemetry-semconv")
   api(project(":instrumentation-api"))
   api("io.opentelemetry:opentelemetry-api-incubator")
@@ -24,6 +26,41 @@ dependencies {
   testImplementation("io.opentelemetry.semconv:opentelemetry-semconv-incubating")
 }
 
+val jflexSourceDir = layout.projectDirectory.dir("src/main/jflex")
+val jflexOutputDir = layout.buildDirectory.dir("generated/sources/jflex")
+
+val generateJflex by tasks.registering(JavaExec::class) {
+  classpath(jflex)
+  mainClass.set("jflex.Main")
+
+  inputs.dir(jflexSourceDir)
+  outputs.dir(jflexOutputDir)
+
+  val sourceDir = jflexSourceDir
+  val outputDirProvider = jflexOutputDir
+
+  doFirst {
+    val outputDir = outputDirProvider.get().asFile
+    outputDir.mkdirs()
+    val specFile = sourceDir.asFile.resolve("SqlSanitizer.jflex")
+    args(
+      "-d", outputDir.absolutePath,
+      "--nobak",
+      specFile.absolutePath,
+    )
+  }
+}
+
+sourceSets {
+  main {
+    java.srcDir(jflexOutputDir)
+  }
+}
+
+tasks.compileJava {
+  dependsOn(generateJflex)
+}
+
 tasks {
   // exclude auto-generated code
   named<Checkstyle>("checkstyleMain") {
@@ -38,7 +75,11 @@ tasks {
   }
 
   sourcesJar {
-    dependsOn("generateJflex")
+    dependsOn(generateJflex)
+    // Avoid configuration cache issue by not capturing task reference
+    from("src/main/jflex") {
+      include("**/*.java")
+    }
   }
 
   val testStableSemconv by registering(Test::class) {