/*

  * This software is licensed under the Apache License, Version 2.0

  * (the "License") agreement; 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 net.admin4j.monitor;

 import java.io.ByteArrayOutputStream;

 import java.io.OutputStreamWriter;

 import java.util.Map;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import net.admin4j.deps.commons.lang3.Validate;

 import net.admin4j.util.Admin4jRuntimeException;

 import net.admin4j.util.FreemarkerUtils;

 import net.admin4j.util.notify.Notifier;

 import freemarker.template.Template;

 /**

  * Base class for all Detectors.

  * @author D. Ashmore

  * @since 1.0

  */

 public abstract class Detector implements Runnable {

     protected Notifier notifier;

     protected Logger logger = LoggerFactory.getLogger(this.getClass());

     public Detector(Notifier emailNotifier) {

         Validate.notNull(emailNotifier, "Null emailNotifier not allowed");

         this.notifier = emailNotifier;

     }

     protected Notifier getNotifier() {

             return notifier;

     }

     protected void sendMessage(String subject, String templateName, Map<String, Object> variableMap) {

         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

         try {

             Template temp = FreemarkerUtils.createConfiguredTemplate(this.getClass(), templateName);

             temp.process(variableMap, new OutputStreamWriter(outputStream));

         }

         catch (Exception e) {

             throw new Admin4jRuntimeException(e);

         }

         this.getNotifier().notify(subject, outputStream.toString());

     }

 }