| // Copyright 2007, 2008, 2010 The Apache Software Foundation |
| // |
| // 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.apache.tapestry5.internal.services; |
| |
| import org.apache.tapestry5.MarkupWriter; |
| import org.apache.tapestry5.internal.structure.Page; |
| import org.apache.tapestry5.ioc.LoggerSource; |
| import org.apache.tapestry5.ioc.ScopeConstants; |
| import org.apache.tapestry5.ioc.annotations.Scope; |
| import org.apache.tapestry5.ioc.internal.util.CollectionFactory; |
| import org.apache.tapestry5.ioc.util.Stack; |
| import org.apache.tapestry5.json.JSONObject; |
| import org.apache.tapestry5.runtime.RenderCommand; |
| import org.apache.tapestry5.services.PartialMarkupRenderer; |
| import org.apache.tapestry5.services.PartialMarkupRendererFilter; |
| import org.slf4j.Logger; |
| |
| /** |
| * This services keeps track of the page being rendered and the root command for the partial render, it is therefore |
| * request/thread scoped. There's a filter pipeline around the rendering, and that gets to be stateless because this |
| * service, at the end of the pipeline, is stateful. |
| */ |
| @Scope(ScopeConstants.PERTHREAD) |
| public class PageRenderQueueImpl implements PageRenderQueue |
| { |
| private final LoggerSource loggerSource; |
| |
| private Page page; |
| |
| private RenderCommand rootCommand; |
| |
| private boolean partialRenderInitialized; |
| |
| private final Stack<PartialMarkupRendererFilter> filters = CollectionFactory.newStack(); |
| |
| private static class Bridge implements PartialMarkupRenderer |
| { |
| private final PartialMarkupRendererFilter filter; |
| |
| private final PartialMarkupRenderer delegate; |
| |
| private Bridge(PartialMarkupRendererFilter filter, PartialMarkupRenderer delegate) |
| { |
| this.filter = filter; |
| this.delegate = delegate; |
| } |
| |
| public void renderMarkup(MarkupWriter writer, JSONObject reply) |
| { |
| filter.renderMarkup(writer, reply, delegate); |
| } |
| } |
| |
| public PageRenderQueueImpl(LoggerSource loggerSource) |
| { |
| this.loggerSource = loggerSource; |
| } |
| |
| public void initializeForCompletePage(Page page) |
| { |
| this.page = page; |
| rootCommand = page.getRootElement(); |
| } |
| |
| public void setRenderingPage(Page page) |
| { |
| assert page != null; |
| this.page = page; |
| } |
| |
| public boolean isPartialRenderInitialized() |
| { |
| return partialRenderInitialized; |
| } |
| |
| public void forcePartialRenderInitialized() |
| { |
| partialRenderInitialized = true; |
| } |
| |
| public void initializeForPartialPageRender(RenderCommand rootCommand) |
| { |
| assert rootCommand != null; |
| |
| if (page == null) |
| throw new IllegalStateException("Page must be specified before root render command."); |
| |
| this.rootCommand = rootCommand; |
| |
| partialRenderInitialized = true; |
| } |
| |
| public RenderCommand getRootRenderCommand() |
| { |
| return rootCommand; |
| } |
| |
| public Page getRenderingPage() |
| { |
| return page; |
| } |
| |
| public void render(MarkupWriter writer) |
| { |
| String name = "tapestry.render." + page.getLogger().getName(); |
| |
| Logger logger = loggerSource.getLogger(name); |
| |
| RenderQueueImpl queue = new RenderQueueImpl(logger); |
| |
| queue.push(rootCommand); |
| |
| // Run the queue until empty. |
| |
| queue.run(writer); |
| } |
| |
| public void addPartialMarkupRendererFilter(PartialMarkupRendererFilter filter) |
| { |
| assert filter != null; |
| |
| filters.push(filter); |
| } |
| |
| public void renderPartial(MarkupWriter writer, JSONObject reply) |
| { |
| PartialMarkupRenderer terminator = new PartialMarkupRenderer() |
| { |
| public void renderMarkup(MarkupWriter writer, JSONObject reply) |
| { |
| render(writer); |
| } |
| }; |
| |
| PartialMarkupRenderer delegate = terminator; |
| |
| while (!filters.isEmpty()) |
| { |
| PartialMarkupRendererFilter filter = filters.pop(); |
| |
| PartialMarkupRenderer bridge = new Bridge(filter, delegate); |
| |
| delegate = bridge; |
| } |
| |
| // The initialize methods will already have been invoked. |
| |
| delegate.renderMarkup(writer, reply); |
| } |
| } |