| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.felix.http.base.internal.whiteboard; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import javax.annotation.CheckForNull; |
| import javax.annotation.Nonnull; |
| import javax.servlet.ServletContext; |
| |
| import org.apache.felix.http.base.internal.context.ExtServletContext; |
| import org.apache.felix.http.base.internal.registry.HandlerRegistry; |
| import org.apache.felix.http.base.internal.registry.PerContextHandlerRegistry; |
| import org.apache.felix.http.base.internal.runtime.ServletContextHelperInfo; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceObjects; |
| import org.osgi.service.http.context.ServletContextHelper; |
| |
| /** |
| * The whiteboard context handler provides some information and functionality for |
| * handling servlet context (helpers). |
| */ |
| public class WhiteboardContextHandler implements Comparable<WhiteboardContextHandler> |
| { |
| /** The info object for the context. */ |
| private final ServletContextHelperInfo info; |
| |
| /** The web context. */ |
| private final ServletContext webContext; |
| |
| /** The http bundle. */ |
| private final Bundle httpBundle; |
| |
| /** A map of all created servlet contexts. Each bundle gets it's own instance. */ |
| private final Map<Long, ContextHolder> perBundleContextMap = new HashMap<Long, ContextHolder>(); |
| |
| /** The corresponding handler registry. */ |
| private volatile PerContextHandlerRegistry registry; |
| |
| /** The shared part of the servlet context. */ |
| private volatile ServletContext sharedContext; |
| |
| public WhiteboardContextHandler(@Nonnull final ServletContextHelperInfo info, |
| @Nonnull final ServletContext webContext, |
| @Nonnull final Bundle httpBundle) |
| { |
| this.webContext = webContext; |
| this.info = info; |
| this.httpBundle = httpBundle; |
| } |
| |
| public @Nonnull BundleContext getBundleContext() |
| { |
| return this.httpBundle.getBundleContext(); |
| } |
| |
| public @Nonnull ServletContextHelperInfo getContextInfo() |
| { |
| return this.info; |
| } |
| |
| @Override |
| public int compareTo(@Nonnull final WhiteboardContextHandler o) |
| { |
| return this.info.compareTo(o.getContextInfo()); |
| } |
| |
| /** |
| * Activate this context. |
| * @return {@code true} if it succeeded. |
| */ |
| public boolean activate(@Nonnull final HandlerRegistry registry) |
| { |
| this.registry = new PerContextHandlerRegistry(this.info); |
| this.sharedContext = new SharedServletContextImpl(webContext, |
| info.getName(), |
| info.getPath(), |
| info.getInitParameters(), |
| this.registry); |
| final boolean activate = getServletContext(httpBundle) != null; |
| if ( !activate ) |
| { |
| this.registry = null; |
| this.sharedContext = null; |
| } |
| else |
| { |
| registry.add(this.registry); |
| } |
| return activate; |
| } |
| |
| /** |
| * Deactivate this context. |
| */ |
| public void deactivate(@Nonnull final HandlerRegistry registry) |
| { |
| registry.remove(this.info); |
| this.registry = null; |
| this.sharedContext = null; |
| this.ungetServletContext(httpBundle); |
| this.perBundleContextMap.clear(); |
| } |
| |
| public @CheckForNull ServletContext getSharedContext() |
| { |
| return sharedContext; |
| } |
| |
| public @CheckForNull ExtServletContext getServletContext(@CheckForNull final Bundle bundle) |
| { |
| if ( bundle == null ) |
| { |
| return null; |
| } |
| final Long key = bundle.getBundleId(); |
| synchronized ( this.perBundleContextMap ) |
| { |
| ContextHolder holder = this.perBundleContextMap.get(key); |
| if ( holder == null ) |
| { |
| final BundleContext ctx = bundle.getBundleContext(); |
| final ServiceObjects<ServletContextHelper> so = (ctx == null ? null : ctx.getServiceObjects(this.info.getServiceReference())); |
| if ( so != null ) |
| { |
| final ServletContextHelper service = so.getService(); |
| if ( service != null ) |
| { |
| holder = new ContextHolder(); |
| holder.servletContextHelper = service; |
| holder.servletContext = new PerBundleServletContextImpl(bundle, |
| this.sharedContext, |
| service, |
| this.registry.getEventListenerRegistry()); |
| this.perBundleContextMap.put(key, holder); |
| } |
| } |
| } |
| if ( holder != null ) |
| { |
| holder.counter++; |
| |
| return holder.servletContext; |
| } |
| } |
| return null; |
| } |
| |
| public void ungetServletContext(@Nonnull final Bundle bundle) |
| { |
| final Long key = bundle.getBundleId(); |
| synchronized ( this.perBundleContextMap ) |
| { |
| ContextHolder holder = this.perBundleContextMap.get(key); |
| if ( holder != null ) |
| { |
| holder.counter--; |
| if ( holder.counter == 0 ) |
| { |
| this.perBundleContextMap.remove(key); |
| if ( holder.servletContextHelper != null ) |
| { |
| final BundleContext ctx = bundle.getBundleContext(); |
| final ServiceObjects<ServletContextHelper> so = (ctx == null ? null : ctx.getServiceObjects(this.info.getServiceReference())); |
| if ( so != null ) |
| { |
| so.ungetService(holder.servletContextHelper); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| public @CheckForNull PerContextHandlerRegistry getRegistry() |
| { |
| return this.registry; |
| } |
| |
| private static final class ContextHolder |
| { |
| public long counter; |
| public ExtServletContext servletContext; |
| public ServletContextHelper servletContextHelper; |
| } |
| } |