    001    // Copyright 2006, 2007, 2008, 2009, 2010 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.internal.services;
    016
    017    import java.io.IOException;
    018    import java.io.PrintWriter;
    019
    020    import org.apache.tapestry5.ContentType;
    021    import org.apache.tapestry5.MarkupWriter;
    022    import org.apache.tapestry5.internal.structure.Page;
    023    import org.apache.tapestry5.services.MarkupWriterFactory;
    024    import org.apache.tapestry5.services.RequestGlobals;
    025    import org.apache.tapestry5.services.Response;
    026    import org.slf4j.Logger;
    027
    028    public class PageResponseRendererImpl implements PageResponseRenderer
    029    {
    030        private final RequestGlobals requestGlobals;
    031
    032        private final PageMarkupRenderer markupRenderer;
    033
    034        private final MarkupWriterFactory markupWriterFactory;
    035
    036        private final PageContentTypeAnalyzer pageContentTypeAnalyzer;
    037
    038        private final Response response;
    039
    040        private final Logger logger;
    041
    042        public PageResponseRendererImpl(RequestGlobals requestGlobals, MarkupWriterFactory markupWriterFactory,
    043                PageMarkupRenderer markupRenderer, PageContentTypeAnalyzer pageContentTypeAnalyzer, Response response,
    044                Logger logger)
    045        {
    046            this.requestGlobals = requestGlobals;
    047            this.markupWriterFactory = markupWriterFactory;
    048            this.markupRenderer = markupRenderer;
    049            this.pageContentTypeAnalyzer = pageContentTypeAnalyzer;
    050            this.response = response;
    051            this.logger = logger;
    052        }
    053
    054        public void renderPageResponse(Page page) throws IOException
    055        {
    056            assert page != null;
    057
    058            requestGlobals.storeActivePageName(page.getName());
    059
    060            ContentType contentType = pageContentTypeAnalyzer.findContentType(page);
    061
    062            // For the moment, the content type is all that's used determine the model for the markup writer.
    063            // It's something of a can of worms.
    064
    065            MarkupWriter writer = markupWriterFactory.newMarkupWriter(contentType);
    066
    067            markupRenderer.renderPageMarkup(page, writer);
    068
    069            PrintWriter pw = response.getPrintWriter(contentType.toString());
    070
    071            long startNanos = System.nanoTime();
    072
    073            writer.toMarkup(pw);
    074
    075            long endNanos = System.nanoTime();
    076
    077            if (logger.isDebugEnabled())
    078            {
    079                long elapsedNanos = endNanos - startNanos;
    080                double elapsedSeconds = ((float) elapsedNanos) / 1000000000F;
    081
    082                logger.debug(String.format("Response DOM streamed to markup in %.3f seconds", elapsedSeconds));
    083            }
    084
    085            pw.close();
    086        }
    087    }