Save This Page
1 // Copyright 2006, 2007, 2008 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry5.internal.services;
16
17 import org.apache.tapestry5.ContentType;
18 import org.apache.tapestry5.MarkupWriter;
19 import org.apache.tapestry5.internal.structure.Page;
20 import org.apache.tapestry5.ioc.internal.util.Defense;
21 import org.apache.tapestry5.services.MarkupWriterFactory;
22 import org.apache.tapestry5.services.Response;
23 import org.slf4j.Logger;
24
25 import java.io.IOException;
26 import java.io.PrintWriter;
27
28 public class PageResponseRendererImpl implements PageResponseRenderer
29 {
30 private final PageMarkupRenderer markupRenderer;
31
32 private final MarkupWriterFactory markupWriterFactory;
33
34 private final PageContentTypeAnalyzer pageContentTypeAnalyzer;
35
36 private final Response response;
37
38 private final Logger logger;
39
40 public PageResponseRendererImpl(MarkupWriterFactory markupWriterFactory, PageMarkupRenderer markupRenderer,
41 PageContentTypeAnalyzer pageContentTypeAnalyzer, Response response, Logger logger)
42 {
43 this.markupWriterFactory = markupWriterFactory;
44 this.markupRenderer = markupRenderer;
45 this.pageContentTypeAnalyzer = pageContentTypeAnalyzer;
46 this.response = response;
47 this.logger = logger;
48 }
49
50 public void renderPageResponse(Page page) throws IOException
51 {
52 Defense.notNull(page, "page");
53
54 ContentType contentType = pageContentTypeAnalyzer.findContentType(page);
55
56 // For the moment, the content type is all that's used determine the model for the markup writer.
57 // It's something of a can of worms.
58
59 MarkupWriter writer = markupWriterFactory.newMarkupWriter(contentType);
60
61 markupRenderer.renderPageMarkup(page, writer);
62
63 PrintWriter pw = response.getPrintWriter(contentType.toString());
64
65 long startNanos = System.nanoTime();
66
67 writer.toMarkup(pw);
68
69 long endNanos = System.nanoTime();
70
71 if (logger.isDebugEnabled())
72 {
73 long elapsedNanos = endNanos - startNanos;
74 double elapsedSeconds = ((float) elapsedNanos) / 1000000000F;
75
76 logger.debug(String.format("Response DOM streamed to markup in %.3f seconds",
77 elapsedSeconds));
78 }
79
80 pw.flush();
81 }
82 }