001 // Copyright 2007, 2008, 2009, 2010, 2011 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 org.apache.tapestry5.ContentType;
018 import org.apache.tapestry5.MarkupWriter;
019 import org.apache.tapestry5.SymbolConstants;
020 import org.apache.tapestry5.internal.InternalConstants;
021 import org.apache.tapestry5.ioc.annotations.Inject;
022 import org.apache.tapestry5.ioc.annotations.Symbol;
023 import org.apache.tapestry5.json.JSONObject;
024 import org.apache.tapestry5.services.*;
025
026 import java.io.IOException;
027 import java.io.PrintWriter;
028
029 public class AjaxPartialResponseRendererImpl implements AjaxPartialResponseRenderer
030 {
031 private final MarkupWriterFactory factory;
032
033 private final Request request;
034
035 private final Response response;
036
037 private final PartialMarkupRenderer partialMarkupRenderer;
038
039 private final String outputEncoding;
040
041 private final boolean compactJSON;
042
043 private final Environment environment;
044
045 public AjaxPartialResponseRendererImpl(MarkupWriterFactory factory,
046
047 Request request,
048
049 Response response,
050
051 PartialMarkupRenderer partialMarkupRenderer,
052
053 @Inject
054 @Symbol(SymbolConstants.CHARSET)
055 String outputEncoding,
056
057 @Symbol(SymbolConstants.COMPACT_JSON)
058 boolean compactJSON, Environment environment)
059 {
060 this.factory = factory;
061 this.request = request;
062 this.response = response;
063 this.partialMarkupRenderer = partialMarkupRenderer;
064 this.outputEncoding = outputEncoding;
065 this.compactJSON = compactJSON;
066 this.environment = environment;
067 }
068
069 public void renderPartialPageMarkup() throws IOException
070 {
071 environment.cloak();
072
073 try
074 {
075 // This is a complex area as we are trying to keep public and private services properly
076 // separated, and trying to keep stateless and stateful (i.e., perthread scope) services
077 // separated. So we inform the stateful queue service what it needs to do here ...
078
079 ContentType pageContentType = (ContentType) request.getAttribute(InternalConstants.CONTENT_TYPE_ATTRIBUTE_NAME);
080
081 ContentType contentType = new ContentType(InternalConstants.JSON_MIME_TYPE, outputEncoding);
082
083 MarkupWriter writer = factory.newPartialMarkupWriter(pageContentType);
084
085 JSONObject reply = new JSONObject();
086
087 // ... and here, the pipeline eventually reaches the PRQ to let it render the root render command.
088
089 partialMarkupRenderer.renderMarkup(writer, reply);
090
091 PrintWriter pw = response.getPrintWriter(contentType.toString());
092
093 reply.print(pw, compactJSON);
094
095 pw.close();
096 } finally
097 {
098 environment.decloak();
099 }
100 }
101 }