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 015package org.apache.tapestry5.internal.services; 016 017import org.apache.tapestry5.ContentType; 018import org.apache.tapestry5.MarkupWriter; 019import org.apache.tapestry5.SymbolConstants; 020import org.apache.tapestry5.internal.InternalConstants; 021import org.apache.tapestry5.ioc.annotations.Inject; 022import org.apache.tapestry5.ioc.annotations.Symbol; 023import org.apache.tapestry5.json.JSONObject; 024import org.apache.tapestry5.services.*; 025 026import java.io.IOException; 027import java.io.PrintWriter; 028 029public 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}