INT-2393 Add Sonar Support (Gradle Plugin)

INT-2393 - Changes in Build.gradle based on Code Review
* Changed line to *jvmArgs "-javaagent:${configurations.jacoco.asPath}=destfile=${buildDir}/jacoco.exec,includes=org.springframework.integration.*"*
* Added *props["sonar.jacoco.reportPath"] = "${buildDirName}/jacoco.exec" to make build work with default build directory*
* Therefore able to remove: *buildDir = "target"*
* Moved *sonar* block to bottom of build script
* Added comments around the **configurations** block
* Switched to use Gradle Properties instead of System Properties for Sonar parameters

INT-2393 - rootProject.hasProperty works
* More simplifications after finding out that **rootProject.hasProperty** works inside the Sonar closure

INT-2393 Based on code review: Fixed build.gradle
Based on Code Review, converted println statement to logger.info in build.gradle

build.gradle

@@ -23,6 +23,7 @@ allprojects {
 }
 
 subprojects { subproject ->
+
     apply plugin: 'java'
     apply plugin: 'maven'
     apply plugin: 'eclipse'
@@ -60,6 +61,12 @@ subprojects { subproject ->
         }
     }
 
+    // See http://www.gradle.org/docs/current/userguide/dependency_management.html#sub:configurations
+    // and http://www.gradle.org/docs/current/dsl/org.gradle.api.artifacts.ConfigurationContainer.html
+    configurations {
+        jacoco //Configuration Group used by Sonar to provide Code Coverage using JaCoCo
+    }
+
     // dependencies that are common across all java projects
     dependencies {
         testCompile "cglib:cglib-nodep:$cglibVersion"
@@ -70,6 +77,7 @@ subprojects { subproject ->
         testCompile "org.hamcrest:hamcrest-all:1.1"
         testCompile "org.mockito:mockito-all:$mockitoVersion"
         testCompile "org.springframework:spring-test:$springVersion"
+        jacoco group: "org.jacoco", name: "org.jacoco.agent", version: "0.5.3.201107060350", classifier: "runtime"
     }
 
     // enable all compiler warnings; individual projects may customize further
@@ -79,6 +87,7 @@ subprojects { subproject ->
     test {
         // suppress all console output during testing unless running `gradle -i`
         logging.captureStandardOutput(LogLevel.INFO)
+        jvmArgs "-javaagent:${configurations.jacoco.asPath}=destfile=${buildDir}/jacoco.exec,includes=org.springframework.integration.*"
     }
 
     bundlor {
@@ -876,6 +885,41 @@ reference {
     sourceDir = file('src/reference/docbook')
 }
 
+apply plugin: 'sonar'
+
+sonar {
+
+    if (rootProject.hasProperty('sonarHostUrl')) {
+        server.url = rootProject.sonarHostUrl
+    }
+
+    database {
+        if (rootProject.hasProperty('sonarJdbcUrl')) {
+            url = rootProject.sonarJdbcUrl
+        }
+        if (rootProject.hasProperty('sonarJdbcDriver')) {
+            driverClassName = rootProject.sonarJdbcDriver
+        }
+        if (rootProject.hasProperty('sonarJdbcUsername')) {
+            username = rootProject.sonarJdbcUsername
+        }
+        if (rootProject.hasProperty('sonarJdbcPassword')) {
+            password = rootProject.sonarJdbcPassword
+        }
+    }
+
+    project {
+        dynamicAnalysis  = "reuseReports"
+        withProjectProperties { props ->
+            props["sonar.core.codeCoveragePlugin"] = "jacoco"
+            props["sonar.jacoco.reportPath"]       = "${buildDirName}/jacoco.exec"
+        }
+    }
+
+    logger.info("Sonar parameters used: server.url='${server.url}'; database.url='${database.url}'; database.driverClassName='${database.driverClassName}'; database.username='${database.username}'")
+
+}
+
 task api(type: Javadoc) {
     group = 'Documentation'
     description = 'Generates aggregated Javadoc API documentation.'