edu.indiana.dlib.avalon.HydrantWorkflowNotifier.java Source code

Introduction

Here is the source code for edu.indiana.dlib.avalon.HydrantWorkflowNotifier.java

Source

/**
 *  Copyright 2009, 2010 The Regents of the University of California
 *  Licensed under the Educational Community 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.osedu.org/licenses/ECL-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 edu.indiana.dlib.avalon;

import org.opencastproject.serviceregistry.api.ServiceRegistry;
import org.opencastproject.workflow.api.WorkflowService;

import org.apache.commons.lang.StringUtils;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HydrantWorkflowNotifier {

    /** The logger */
    private static final Logger logger = LoggerFactory.getLogger(HydrantWorkflowNotifier.class);

    /** The workflow service */
    private WorkflowService workflowService;

    /** The opencast service registry */
    private ServiceRegistry serviceRegistry;

    /** The listener that pings Hydrant when an operation changed **/
    private HydrantWorkflowListener listener;

    /** The configuration key for the Avalon pingback URL **/
    private static final String urlConfigKey = "org.avalonmediasystem.avalon.url";

    public HydrantWorkflowNotifier() {
    }

    /**
     * OSGI callback for activating this component
     * 
     * @param cc
     *          the osgi component context
     */
    protected void activate(ComponentContext cc) {
        logger.info("HydrantWorkflowNotifier started.");

        String hydrantUrl = null;
        // Get the configured hydrant server URL
        if (cc != null) {
            hydrantUrl = StringUtils.trimToNull(cc.getBundleContext().getProperty(urlConfigKey));
            if (hydrantUrl == null)
                logger.warn("Avalon pingback url was not set (" + urlConfigKey + ")");
            else
                logger.info("Avalon pingback url is {}", hydrantUrl);
        }

        listener = new HydrantWorkflowListener(hydrantUrl);
        workflowService.addWorkflowListener(listener);
    }

    /**
     * Callback from OSGi on service deactivation.
     */
    public void deactivate() {
        workflowService.removeWorkflowListener(listener);
    }

    /**
     * Sets the service registry
     * 
     * @param serviceRegistry
     *          the serviceRegistry to set
     */
    public void setServiceRegistry(ServiceRegistry serviceRegistry) {
        this.serviceRegistry = serviceRegistry;
    }

    public void setWorkflowService(WorkflowService workflowService) {
        this.workflowService = workflowService;
    }

    protected ServiceRegistry getServiceRegistry() {
        return serviceRegistry;
    }

}