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/*
* Copyright 2000-2021 Vaadin Ltd.
*
* 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.vaadin.osgi.resources;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
/**
* {@link BundleActivator} used to provide access to the
* {@link VaadinResourceService} singleton for publishing themes, widgetsets and
* other necessary resources.
*
* @author Vaadin Ltd.
*
* @since 8.1
* @deprecated use OSGi DS services to bind a instance of
* {@link VaadinResourceService}
*/
public class OsgiVaadinResources implements BundleActivator {
/**
* Thrown if a method is called when the Resource bundle is not active.
*
* @author Vaadin Ltd.
*
* @since 8.1
*/
@SuppressWarnings("serial")
public static class ResourceBundleInactiveException extends Exception {
public ResourceBundleInactiveException(String message) {
super(message);
}
}
private static OsgiVaadinResources instance;
private ServiceTracker<VaadinResourceService, VaadinResourceService> vaadinResourceTracker;
private VaadinResourceService service;
/**
* Returns the {@link VaadinResourceService} instance. Always returns
* non-null.
*
* @return the {@link VaadinResourceService resource service} to use for
* publishing themes, widgetsets and other necessary resources
* @throws ResourceBundleInactiveException
* if the bundle is not active
*/
public static VaadinResourceService getService()
throws ResourceBundleInactiveException {
if (instance == null) {
throw new ResourceBundleInactiveException(
"Vaadin Shared is not active!");
}
return instance.service;
}
@Override
public void start(BundleContext context) throws Exception {
vaadinResourceTracker = new ServiceTracker<VaadinResourceService, VaadinResourceService>(
context, VaadinResourceService.class, null) {
@Override
public VaadinResourceService addingService(
ServiceReference<VaadinResourceService> reference) {
VaadinResourceService vaadinService = super.addingService(
reference);
service = vaadinService;
return vaadinService;
}
@Override
public void removedService(
ServiceReference<VaadinResourceService> reference,
VaadinResourceService service) {
super.removedService(reference, service);
if (OsgiVaadinResources.this.service == service) {
OsgiVaadinResources.this.service = null;
}
}
};
vaadinResourceTracker.open();
instance = this;
}
@Override
public void stop(BundleContext context) throws Exception {
if (vaadinResourceTracker != null) {
vaadinResourceTracker.close();
}
vaadinResourceTracker = null;
instance = null;
service = null;
}
}
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