Enable javadoc generation and distribution

build.gradle

@@ -34,6 +34,15 @@ ext {
 
     junitVersion = "4.11"
     mockitoVersion = "1.9.5"
+    
+	javadocLinks = [
+		'http://docs.oracle.com/javase/7/docs/api/',
+		'http://docs.oracle.com/javaee/6/api/',
+		'http://docs.spring.io/spring/docs/current/javadoc-api/',
+		'http://docs.spring.io/spring-amqp/docs/latest-ga/api/',
+		'http://docs.spring.io/spring-data/data-mongo/docs/current/api/',
+		'http://docs.spring.io/spring-data/data-redis/docs/current/api/'
+	] as String[]    
 }
 
 subprojects {
@@ -51,13 +60,25 @@ subprojects {
     sourceCompatibility = 1.6
     targetCompatibility = 1.6
 
+	javadoc {
+        options.memberLevel = org.gradle.external.javadoc.JavadocMemberLevel.PROTECTED
+        options.author = true
+        options.header = project.name
+    }
+    
     task packageSources(type: Jar) {
         classifier = 'sources'
         from sourceSets.main.allSource
     }
+    
+	task javadocJar(type: Jar) {
+        classifier = "javadoc"
+        from javadoc
+    }    
 
     artifacts {
     		archives packageSources
+    		archives javadocJar
     }
 
     dependencies {
@@ -102,7 +123,40 @@ configure(rootProject) {
 		}
 	}
 	
+	task api(type: Javadoc) {
+        group = "Documentation"
+        description = "Generates aggregated Javadoc API documentation."
+        title = "${rootProject.description} ${version} API"
+        options.memberLevel = org.gradle.external.javadoc.JavadocMemberLevel.PROTECTED
+        options.author = true
+        options.header = rootProject.description
+        options.links(project.ext.javadocLinks)
+
+        source subprojects.collect { project ->
+            project.sourceSets.main.allJava
+        }
+
+        classpath = files(subprojects.collect { project ->
+            project.sourceSets.main.compileClasspath
+        })
+
+        maxMemory = "1024m"
+        destinationDir = new File(buildDir, "api")
+    }	
+	
+	task docsZip(type: Zip) {
+		group = 'Distribution'
+		classifier = 'docs'
+		description = "Builds -${classifier} archive containing api and reference " +
+			"for deployment at docs.spring.io/spring-cloud/docs."
+
+		from (api) {
+			into 'api'
+		}
+	}
+	
 	artifacts {
+		archives docsZip	
 		archives schemaZip
 	}
 }