Refactor templates (remove the need for Java code)

core/pom.xml

@@ -30,7 +30,16 @@
     <artifactId>provisionr-core</artifactId>
     <packaging>bundle</packaging>
 
+    <properties>
+        <osgi.import>*</osgi.import>
+        <osgi.export>com.axemblr.provisionr.core*</osgi.export>
+    </properties>
+
     <dependencies>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.core</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
@@ -55,6 +64,10 @@
             <groupId>com.github.spullara.mustache.java</groupId>
             <artifactId>compiler</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>org.apache.felix.fileinstall</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.axemblr.provisionr</groupId>
             <artifactId>provisionr-test-support</artifactId>
@@ -107,6 +120,11 @@
             <artifactId>mockito-all</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>xmlunit</groupId>
+            <artifactId>xmlunit</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -125,7 +143,8 @@
                 <artifactId>maven-bundle-plugin</artifactId>
                 <configuration>
                     <instructions>
-                        <Export-Packages>com.axemblr.provisionr.core, *</Export-Packages>
+                        <Import-Packages>${osgi.import}</Import-Packages>
+                        <Export-Packages>${osgi.export}</Export-Packages>
                     </instructions>
                 </configuration>
             </plugin>
@@ -151,6 +170,27 @@
                                     <type>cfg</type>
                                     <classifier>defaults</classifier>
                                 </artifact>
+                                <artifact>
+                                    <file>
+                                        ${project.build.directory}/classes/org.apache.felix.fileinstall-templates.cfg
+                                    </file>
+                                    <type>cfg</type>
+                                    <classifier>fileinstall</classifier>
+                                </artifact>
+                                <artifact>
+                                    <file>
+                                        ${project.build.directory}/classes/com/axemblr/provisionr/core/templates/cdh3.xml
+                                    </file>
+                                    <type>template</type>
+                                    <classifier>cdh3</classifier>
+                                </artifact>
+                                <artifact>
+                                    <file>
+                                        ${project.build.directory}/classes/com/axemblr/provisionr/core/templates/jenkins.xml
+                                    </file>
+                                    <type>template</type>
+                                    <classifier>jenkins</classifier>
+                                </artifact>
                             </artifacts>
                         </configuration>
                     </execution>

core/src/main/java/com/axemblr/provisionr/core/templates/PoolTemplateInstaller.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2012 S.C. Axemblr Software Solutions S.R.L
+ *
+ * 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
+ *
+ *    http://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.
+ */
+
+package com.axemblr.provisionr.core.templates;
+
+import com.axemblr.provisionr.core.templates.xml.XmlTemplate;
+import static com.google.common.base.Preconditions.checkNotNull;
+import com.google.common.collect.Maps;
+import java.io.File;
+import java.util.concurrent.ConcurrentMap;
+import org.apache.felix.fileinstall.ArtifactInstaller;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceRegistration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Listener for pool template files
+ * <p/>
+ * When a new xml file is places under templates this class is
+ * notified and a new pool template is registered as a service
+ */
+public class PoolTemplateInstaller implements ArtifactInstaller {
+
+    private static final Logger LOG = LoggerFactory.getLogger(PoolTemplateInstaller.class);
+
+    public static final String TEMPLATES_FOLDER = "templates";
+    public static final String TEMPLATES_EXTENSION = ".xml";
+
+    /**
+     * A bundle context provided by the OSGi framework
+     */
+    private final BundleContext bundleContext;
+
+    /**
+     * A map with all the pool templates registered by this listener
+     */
+    private final ConcurrentMap<String, ServiceRegistration> templates;
+
+    public PoolTemplateInstaller(BundleContext bundleContext) {
+        this.bundleContext = checkNotNull(bundleContext, "bundleContext is null");
+        this.templates = Maps.newConcurrentMap();
+    }
+
+    @Override
+    public boolean canHandle(File file) {
+        return TEMPLATES_FOLDER.equals(file.getParentFile().getName())
+            && file.getName().endsWith(TEMPLATES_EXTENSION);
+    }
+
+    /**
+     * Install a new pool template as a service using the file content
+     * <p/>
+     * The absolute file path is the unique identifier
+     */
+    @Override
+    public void install(File file) throws Exception {
+        final String absolutePath = file.getAbsolutePath();
+        LOG.info("Installing Pool template from  " + absolutePath);
+
+        if (!templates.containsKey(absolutePath)) {
+            PoolTemplate template = XmlTemplate.newXmlTemplate(file);
+            ServiceRegistration registration = bundleContext
+                .registerService(PoolTemplate.class.getName(), template, null);
+
+            templates.put(absolutePath, registration);
+            LOG.info("Registered new template with ID: " + template.getId());
+        }
+    }
+
+    /**
+     * Uninstall a pool description identified by the absolute file path
+     */
+    @Override
+    public void uninstall(File file) throws Exception {
+        final String absolutePath = file.getAbsolutePath();
+        LOG.info("Uninstalling Pool template for path " + absolutePath);
+
+        if (templates.containsKey(absolutePath)) {
+            templates.remove(absolutePath).unregister();
+        }
+    }
+
+    /**
+     * Update a pool template
+     * <p/>
+     * This method performs no actions if there is no pool registered for this file
+     */
+    @Override
+    public void update(File file) throws Exception {
+        if (templates.containsKey(file.getAbsolutePath())) {
+            uninstall(file);
+            install(file);
+        }
+    }
+}