Added the ability to manage tomcat & java setup

Added $manage_app_server and $install_java params in order to be able to
whether install tomcat & java or not, and avoid puppet executions to
fail because of duplicated class declarations.

Change-Id: I644e448a28ca324a9c3be4866642db220db988f5

README.md

@@ -139,6 +139,21 @@ You can alternatively use the Hiera's yaml style:
         - 'host2'
         - 'host3'
 
+Note: midonet\_agent class already makes a call to midonet\_agent::install.
+This class allows to choose whether you want it to install and manage Java, or
+use an existing installations instead.
+
+For this purpose a param has been added and its value has been defaulted to
+'true'. Should you want to manage the Java installation from another puppet
+module and avoid duplicated class declaration, change the value to 'false':
+
+    class { 'midonet::midonet_agent::install':
+      install_java      => false
+    }
+
+You can alternatively use the Hiera's yaml style:
+
+  midonet::midonet_agent::install::install_java: false
 
 #### MidoNet API
 
@@ -184,6 +199,25 @@ You can alternatively use the Hiera's yaml style:
 
 Please note that Zookeeper port is not mandatory and defaulted to 2181.
 
+Note: midonet\_api class already makes a call to midonet\_api::install. This
+class allows you to choose whether you want it to install and manage Tomcat and
+Java, or use existing installations of both instead.
+
+For this purpose 2 parameters have been added and their values have been
+defaulted to 'true'. Should you want to manage Tomcat and Java installation
+from another puppet module and avoid duplicated class declaration, change the
+values to 'false':
+
+    class { 'midonet::midonet_api::install':
+      install_java      => false,
+      manage_app_server => false
+    }
+
+You can alternatively use the Hiera's yaml style:
+
+  midonet::midonet_api::install::install_java: false
+  midonet::midonet_api::install::manage_app_server: false
+
 #### MidoNet CLI
 
 Install the MidoNetCLI this way:

data/common.yaml

@@ -8,3 +8,9 @@ midonet::zookeeper::server_id: '1'
 midonet::cassandra::seeds:
   - 'localhost'
 midonet::cassandra::seed_address: 'localhost'
+
+# Choose whether to manage Tomcat and Java installation (true) or use an
+# existing installation instead (false).
+midonet::midonet_agent::install::install_java: true
+midonet::midonet_api::install::manage_app_server: true
+midonet::midonet_api::install::install_java: true

manifests/midonet_agent/install.pp

@@ -22,19 +22,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-class midonet::midonet_agent::install {
+class midonet::midonet_agent::install (
+  $install_java = true
+) {
 
-    require midonet::repository
+  require midonet::repository
 
+  if ($install_java == true) {
     if ! defined(Class['java']) {
-        class {'java':
-            distribution => 'jre',
-            require      => Exec['update-midonet-repos']
-        }
+      class { 'java':
+        distribution => 'jre',
+        require      => Exec['update-midonet-repos']
+      }
     }
+  }
+
+  package {'midolman':
+    ensure  => present,
+  }
 
-    package {'midolman':
-        ensure  => present,
-        require => Class['java']
-    }
 }
+

manifests/midonet_api/install.pp

@@ -22,24 +22,35 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-class midonet::midonet_api::install {
+class midonet::midonet_api::install (
+  $install_java      = true,
+  $manage_app_server = true
+) {
 
     require midonet::repository
     require midonet::midonet_api::augeas
 
-    if ! defined(Class['java']) {
-      class {'java':
-        distribution => 'jre',
-        require      => Exec['update-midonet-repos']
+    if ($manage_app_server == true) {
+      if ($install_java == true) {
+        if ! defined(Class['java']) {
+          class { 'java':
+            distribution => 'jre',
+            require      => Exec['update-midonet-repos']
+          } ->
+
+          class { 'tomcat':
+            install_from_source => false,
+            require             => Exec['update-midonet-repos']
+          }
+        } else {
+          class { 'tomcat':
+            install_from_source => false,
+            require             => Exec['update-midonet-repos']
+          }
+        }
       }
     }
 
-    class {'tomcat':
-      install_from_source => false,
-      require             => [Class['java'],
-                              Exec['update-midonet-repos']]
-    } ->
-
     package {'midonet-api':
       ensure  => present,
     }