Support sonarqube-gradle-plugin 2.8 or newer

They have changed the SonarPropertyComputer's parameter
from a Map<Project, ActionBroadcast<SonarQubeProperties>>
to a Map<String, ActionBroadcast<SonarQubeProperties>>

build.gradle

@@ -3,14 +3,13 @@ plugins {
     id 'net.researchgate.release' version '2.6.0'
     id 'groovy'
 }
-
 group = 'com.ullink.gradle'
 description 'Uses sonar-scanner-msbuild to do static analysis with Sonarqube.'
 
 dependencies {
     compile(
         [group: 'de.undercouch', name: 'gradle-download-task', version: '3.4.3'],
-        [group: 'org.sonarsource.scanner.gradle', name: 'sonarqube-gradle-plugin', version: '2.7']
+        [group: 'org.sonarsource.scanner.gradle', name: 'sonarqube-gradle-plugin', version: '2.8']
     )
 }
 

src/main/groovy/com/ullink/gradle/sonar/SonarScannerMsbuildPlugin.groovy

@@ -6,7 +6,7 @@ import org.gradle.api.tasks.Exec
 import org.sonarqube.gradle.ActionBroadcast
 import org.sonarqube.gradle.SonarPropertyComputer
 import org.sonarqube.gradle.SonarQubeExtension
-
+import org.sonarqube.gradle.SonarQubeProperties
 /**
  * Uses SonarScanner for MSBuild to run the Sonarqube analysis.
  * See https://docs.sonarqube.org/display/SCAN/Analyzing+with+SonarQube+Scanner+for+MSBuild
@@ -29,7 +29,7 @@ class SonarScannerMsbuildPlugin implements Plugin<Project> {
         'sonar.working.directory' // is automatically set and cannot be overridden on the command line
     ]
 
-    def actionBroadcast = new ActionBroadcast()
+    def actionBroadcast = new ActionBroadcast<SonarQubeProperties>()
 
     @Override
     void apply(Project project) {
@@ -95,7 +95,6 @@ class SonarScannerMsbuildPlugin implements Plugin<Project> {
     }
 
     private static def buildArgs(Map<String, Object> properties) {
-
         def mandatoryArgs = MANDATORY_ARGS.collect { key, value ->
             "/${key}:${properties[value]}"
         }
@@ -110,9 +109,9 @@ class SonarScannerMsbuildPlugin implements Plugin<Project> {
     }
 
     private def computeSonarProperties(Project project) {
-        def actionBradcastMap = [:]
-        actionBradcastMap.put(project, actionBroadcast)
-        def propertyComputer = new SonarPropertyComputer(actionBradcastMap, project)
+        Map<String, ActionBroadcast<SonarQubeProperties>> actionBroadcastMap = [:]
+        actionBroadcastMap.put(project.getPath(), actionBroadcast)
+        def propertyComputer = new SonarPropertyComputer(actionBroadcastMap, project)
         return propertyComputer.computeSonarProperties()
     }
 }