com.digitalgeneralists.assurance.ui.workers.LoadScansWorker.java Source code

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Here is the source code for com.digitalgeneralists.assurance.ui.workers.LoadScansWorker.java

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/*
 * Assurance
 * 
 * Created by Mark Johnson
 * 
 * Copyright (c) 2015 Digital Generalists, LLC.
 * 
 */
/*
 * Copyright 2015 Digital Generalists, LLC.
 *
 * 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.digitalgeneralists.assurance.ui.workers;

import java.util.List;
import java.util.concurrent.ExecutionException;

import javax.swing.SwingWorker;

import org.apache.log4j.Logger;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.digitalgeneralists.assurance.model.IModelDelegate;
import com.digitalgeneralists.assurance.model.entities.Scan;
import com.digitalgeneralists.assurance.notification.INotificationProvider;
import com.digitalgeneralists.assurance.notification.events.ScansLoadedEvent;

public class LoadScansWorker extends SwingWorker<List<Scan>, Object> {
    private Logger logger = Logger.getLogger(LoadScansWorker.class);

    private INotificationProvider notifier;

    public LoadScansWorker(INotificationProvider notifier) {
        this.notifier = notifier;
    }

    @Override
    protected List<Scan> doInBackground() throws Exception {
        List<Scan> list = null;

        // Because we are operating in a Swing application, the session context
        // closes after the initial bootstrap run. There appears to be an
        // "application"-level session configuration that should enable the
        // behavior we want for a desktop application, but there is no documentation
        // for it that I can find. 
        // So, Assurance mimics a web app request/response
        // cycle for calls into the model delegate through the Swing
        // application. All calls to the model initiated directly from the UI
        // essentially operate as a new "request" and rebuild the Hibernate and
        // Spring session contexts for use within that operation.
        ClassPathXmlApplicationContext springContext = null;
        try {
            springContext = new ClassPathXmlApplicationContext("/META-INF/spring/app-context.xml");
            IModelDelegate modelDelegate = (IModelDelegate) springContext.getBean("ModelDelegate");

            list = modelDelegate.getScans();
            modelDelegate = null;
        } finally {
            if (springContext != null) {
                springContext.close();
            }
            springContext = null;
        }

        return list;
    }

    @Override
    protected void done() {
        try {
            this.notifier.fireEvent(new ScansLoadedEvent(this.get()));
        } catch (InterruptedException e) {
            logger.info("Load scans was aborted.");
        } catch (ExecutionException e) {
            logger.error(e);
        } finally {
            this.notifier = null;
            this.logger = null;
        }
    }
}