[build] Use Spotless plugin to enforce/update copyright headers

.github/workflows/ci.yml

@@ -42,14 +42,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
     - uses: actions/setup-java@v1
       with:
         java-version: 8
     - uses: eskatos/gradle-command-action@v1
-      name: gradle
+      name: license header
       with:
-        arguments: check -x :reactor-core:test --no-daemon
+        arguments: spotlessCheck -PspotlessFrom=origin/${{ github.base_ref }}
         wrapper-cache-enabled: true
         dependencies-cache-enabled: true
         configuration-cache-enabled: true
-#the above should exclude jcstress in master, adding a 3rd job below for jcstress
+    - uses: eskatos/gradle-command-action@v1
+      name: other tests
+      with:
+        arguments: check -x :reactor-core:test --no-daemon
+        wrapper-cache-enabled: true
+        dependencies-cache-enabled: true
+        configuration-cache-enabled: true

build.gradle

@@ -39,6 +39,7 @@ plugins {
 	id 'biz.aQute.bnd.builder' version '5.0.1' apply false
 	id 'io.spring.nohttp' version '0.0.5.RELEASE'
 	id "io.github.reyerizo.gradle.jcstress" version "0.8.11" apply false
+	id "com.diffplug.spotless" version "5.14.0"
 }
 
 apply plugin: "io.reactor.gradle.detect-ci"
@@ -106,6 +107,27 @@ nohttp {
 	allowlistFile = project.file('codequality/nohttp/allowlist.lines')
 }
 
+spotless {
+	if (project.hasProperty("spotlessFrom")) {
+		println "[Spotless] Ratchet from $project.spotlessFrom"
+		ratchetFrom project.spotlessFrom
+	}
+	else if (isCiServer) {
+		println "[Spotless] CI detected without explicit branch, not enforcing check"
+		enforceCheck false
+	}
+	else {
+		String spotlessBranch = "origin/3.3.x"
+		println "[Spotless] Local run detected, ratchet from $spotlessBranch"
+		ratchetFrom spotlessBranch
+	}
+	java {
+		target '**/*.java'
+		targetExclude '**/java8stubs/**/*', '**/java9stubs/**/*'
+		licenseHeaderFile('codequality/spotless/licenseSlashstarStyle.txt')
+	}
+}
+
 configure(subprojects) { p ->
 	apply plugin: 'java'
 	apply plugin: 'jacoco'

codequality/spotless/licenseSlashstarStyle.txt

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2011-$today.year VMware Inc. or its affiliates, All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+