org.ops4j.pax.wicket.internal.PageMounterTracker Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.ops4j.pax.wicket.service Show documentation
Pax Wicket Service is an OSGi extension of the Wicket framework, allowing for dynamic loading and unloading of Wicket components and pageSources.
There is a newer version: 5.0.0
Show newest version
/**
 * Copyright OPS4J
 *
 * 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 org.ops4j.pax.wicket.internal;

import static java.lang.String.format;
import static org.ops4j.lang.NullArgumentException.validateNotNull;
import static org.ops4j.pax.wicket.api.Constants.APPLICATION_NAME;
import static org.osgi.framework.Constants.OBJECTCLASS;

import java.util.List;

import org.apache.wicket.Application;
import org.apache.wicket.Session;
import org.apache.wicket.ThreadContext;
import org.apache.wicket.mock.MockWebRequest;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.protocol.http.WebSession;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.Url;
import org.ops4j.pax.wicket.api.MountPointInfo;
import org.ops4j.pax.wicket.api.PageMounter;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class PageMounterTracker extends ServiceTracker {

    private static final Logger LOGGER = LoggerFactory.getLogger(PageMounterTracker.class);

    private final WebApplication application;

    public PageMounterTracker(BundleContext context, WebApplication application, String applicationName)
        throws IllegalArgumentException {
        super(context, createFilter(context, applicationName), null);
        validateNotNull(application, "application");
        this.application = application;
    }

    private static Filter createFilter(BundleContext context, String applicationName)
        throws IllegalArgumentException {
        validateNotNull(context, "Context");
        validateNotNull(applicationName, "applicationName");

        String filterString =
            "(&(" + OBJECTCLASS + "=" + PageMounter.class.getName() + ")"
                    + "(" + APPLICATION_NAME + "=" + applicationName + "))";

        try {
            return context.createFilter(filterString);
        } catch (InvalidSyntaxException e) {
            throw new IllegalStateException(format(
                "Application name [%s] is not allowed to contain spaces or special chars", applicationName), e);
        }
    }

    @Override
    public final Object addingService(ServiceReference reference) {
        PageMounter mounter = (PageMounter) super.addingService(reference);

        List infos = mounter.getMountPoints();
        for (MountPointInfo info : infos) {
            LOGGER.trace("Make sure that path {} is clear before trying to remount", info.getPath());
            Application oldApp = ThreadContext.getApplication();
            ThreadContext.setApplication(application);
            try {
                application.unmount(info.getPath());
            } catch (IllegalArgumentException e) {
                LOGGER.trace("Unmounting not possible since nothing here by now.");
                // this could happen if wicket had not been started at all by now --> simply ignore
            }
            LOGGER.trace("Trying to mount {} with {}", info.getPath(), info.getPage().getName());
            application.mountPage(info.getPath(), info.getPage());
            ThreadContext.setApplication(oldApp);
            LOGGER.info("Mounted {} with {}", info.getPath(), info.getPage().getName());
        }

        return mounter;
    }

    @Override
    public final void removedService(ServiceReference reference, Object mounter) {
        PageMounter pageMounter = (PageMounter) mounter;
        List infos = pageMounter.getMountPoints();
        for (MountPointInfo info : infos) {
            LOGGER.trace("Trying to mount {} with {}", info.getPath(), info.getPage().getName());
            Application oldApp = ThreadContext.getApplication();
            ThreadContext.setApplication(application);
            if (!Session.exists()) {
                Request request = new MockWebRequest(Url.parse(info.getPath()));
                ThreadContext.setSession(new WebSession(request));
            }
            application.unmount(info.getPath());
            ThreadContext.setApplication(oldApp);
            LOGGER.info("Unmounted {} with {}", info.getPath(), info.getPage().getName());
        }

        super.removedService(reference, pageMounter);
    }
}