Example servlet reading and updated OSGi configs in Adobe Experience Manager

OsgiConfigExampleServlet.java

package com.nateyolles.aem;

import org.osgi.framework.InvalidSyntaxException;
import org.osgi.service.cm.Configuration;

import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.apache.sling.commons.osgi.PropertiesUtil;
import org.osgi.service.cm.ConfigurationAdmin;

import javax.servlet.ServletException;

import java.io.IOException;
import java.util.Dictionary;
import java.util.Hashtable;

@SlingServlet(paths = "/bin/bar")
public class OsgiConfigExampleServlet extends SlingAllMethodsServlet {

    /** Service to get OSGi configurations */
    @Reference
    private ConfigurationAdmin configAdmin;

    private static final String LOGGER_FACTORY_PID = "org.apache.sling.commons.log.LogManager.factory.config";
    private static final String CUSTOM_LOGGER_PID = "org.apache.sling.commons.log.LogManager.factory.config.278b07c1-7eb9-43a8-8d84-8fed5ee6b0a4";
    private static final String HTML_LIBRARY_MANAGER_PID = "com.day.cq.widget.impl.HtmlLibraryManagerImpl";
    private static final String MINIFY_PROPERTY = "htmllibmanager.minify";

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response)
            throws ServletException, IOException {

        /* Managed Service and Manage Service Factory configs */
        Configuration loggerFactoryConfig = configAdmin.getConfiguration(LOGGER_FACTORY_PID);
        Configuration loggerConfig = configAdmin.getConfiguration(CUSTOM_LOGGER_PID);

        /* returns true */
        boolean isFactoryPid = loggerConfig.getFactoryPid().equals(loggerFactoryConfig.getPid());

        /* Get all configs from the factory */
        try {
            /* Java filter syntax*/
            String filter = '(' + ConfigurationAdmin.SERVICE_FACTORYPID + '=' + LOGGER_FACTORY_PID + ')';
            Configuration[] allLoggerConfigs = configAdmin.listConfigurations(filter);
        } catch (InvalidSyntaxException e) {
            // TODO Auto-generated catch block
        }
        /*********************************************/


        /* Get properties */
        Configuration htmlLibraryManangerConfig = configAdmin.getConfiguration(HTML_LIBRARY_MANAGER_PID);
        Dictionary<String, Object> properties = htmlLibraryManangerConfig.getProperties();

        boolean isMinify = PropertiesUtil.toBoolean(properties.get(MINIFY_PROPERTY), false);
        /*********************************************/


        /* Set properties */
        if (properties == null) {
            properties = new Hashtable<String, Object>();
        }

        /* Remember HashTables don't accept null values. */
        properties.put(MINIFY_PROPERTY, true);
        htmlLibraryManangerConfig.update(properties);
    }
}