org.eclipse.springframework.util.ApplicationContextTracker.java Source code

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Here is the source code for org.eclipse.springframework.util.ApplicationContextTracker.java

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/*******************************************************************************
 * Copyright (c) 2008 metafinanz.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Heiko Seeberger - initial implementation
 *     Martin Lippert - slightly changed and using waitForService now
 *******************************************************************************/
package org.eclipse.springframework.util;

import static java.text.MessageFormat.format;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;
import org.springframework.context.ApplicationContext;

/**
 * @author Heiko Seeberger
 */
public class ApplicationContextTracker {

    private static final String FILTER = "(&(objectClass=org.springframework.context.ApplicationContext)" //$NON-NLS-1$
            + "(org.springframework.context.service.name={0}))"; //$NON-NLS-1$

    private ServiceTracker applicationContextServiceTracker;

    /**
     * @param contributorBundle
     *       OSGi bundle for which the Spring application context is to be
     *       tracked. Must not be null!
     * @param factoryBundleContext
     *      BundleContext object which can be used to track services
     * @param timeout 
     * @throws IllegalArgumentException
     *       if the given bundle is null.
     */
    public ApplicationContextTracker(final Bundle contributorBundle, final BundleContext factoryBundleContext) {
        final String filter = format(FILTER, contributorBundle.getSymbolicName());
        try {
            applicationContextServiceTracker = new ServiceTracker(factoryBundleContext,
                    FrameworkUtil.createFilter(filter), null);
            applicationContextServiceTracker.open();
        } catch (final InvalidSyntaxException e) {
            e.printStackTrace();
        }
    }

    public void close() {
        if (applicationContextServiceTracker != null) {
            applicationContextServiceTracker.close();
        }
    }

    public ApplicationContext getApplicationContext(int timeout) {
        ApplicationContext applicationContext = null;
        if (applicationContextServiceTracker != null) {
            try {
                applicationContext = (ApplicationContext) applicationContextServiceTracker.waitForService(timeout);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        return applicationContext;
    }

    @Override
    protected void finalize() throws Throwable {
        close();
        super.finalize();
    }
}