org.avalonmediasystem.AvalonWorkflowListener.java Source code

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Here is the source code for org.avalonmediasystem.AvalonWorkflowListener.java

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/*
 * This file has been modified from the original distribution. 
 * Modifications Copyright 2013 The Trustees of Indiana University and Northwestern University.
 */

/**
 *  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 org.avalonmediasystem;

import org.opencastproject.workflow.api.WorkflowInstance;
import org.opencastproject.workflow.api.WorkflowListener;
import org.opencastproject.util.UrlSupport;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.methods.PutMethod;
import org.apache.commons.httpclient.methods.multipart.StringPart;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A simple workflow listener implementation suitable for monitoring a workflow's state changes.
 */
public class AvalonWorkflowListener implements WorkflowListener {

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

    private static String avalonUrl = null;

    public AvalonWorkflowListener(String url) {
        avalonUrl = url;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.opencastproject.workflow.api.WorkflowListener#operationChanged(org.opencastproject.workflow.api.WorkflowInstance)
     */
    @Override
    public void operationChanged(WorkflowInstance workflow) {
        synchronized (this) {
            logger.trace("Operation changed - pinging Avalon");
            String pid = workflow.getMediaPackage().getTitle();
            long id = workflow.getId();
            pingAvalon(pid, id);
        }
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.opencastproject.workflow.api.WorkflowListener#stateChanged(org.opencastproject.workflow.api.WorkflowInstance)
     */
    @Override
    public void stateChanged(WorkflowInstance workflow) {
        synchronized (this) {
            logger.trace("State changed - pinging Avalon");
            String pid = workflow.getMediaPackage().getTitle();
            long id = workflow.getId();
            pingAvalon(pid, id);
        }
    }

    private void pingAvalon(String pid, long workflowId) {
        logger.trace("Starting to ping Avalon: " + pid + " " + workflowId);
        try {
            String url = UrlSupport.concat(new String[] { avalonUrl, "master_files", pid });
            MultiThreadedHttpConnectionManager mgr = new MultiThreadedHttpConnectionManager();
            HttpClient client = new HttpClient(mgr);

            PutMethod put = new PutMethod(url);

            Part[] parts = { new StringPart("workflow_id", String.valueOf(workflowId)), };
            put.setRequestEntity(new MultipartRequestEntity(parts, put.getParams()));
            logger.trace("About to ping Avalon");
            int status = client.executeMethod(put);
            logger.debug("Got status: " + status);
            logger.trace("Got response body: " + put.getResponseBodyAsString());
        } catch (Exception e) {
            logger.debug("Exception pinging Avalon: " + e.getCause(), e);
        }
    }

}