001// Copyright 2007-2014 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.TapestryConstants; 021import org.apache.tapestry5.internal.InternalConstants; 022import org.apache.tapestry5.ioc.IOOperation; 023import org.apache.tapestry5.ioc.annotations.Inject; 024import org.apache.tapestry5.ioc.annotations.Symbol; 025import org.apache.tapestry5.json.JSONObject; 026import org.apache.tapestry5.services.*; 027 028import java.io.IOException; 029import java.io.PrintWriter; 030 031public class AjaxPartialResponseRendererImpl implements AjaxPartialResponseRenderer 032{ 033 private final MarkupWriterFactory factory; 034 035 private final Request request; 036 037 private final Response response; 038 039 private final PartialMarkupRenderer partialMarkupRenderer; 040 041 private final String outputEncoding; 042 043 private final boolean compactJSON; 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) 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 } 067 068 public void renderPartialPageMarkup(final JSONObject reply) throws IOException 069 { 070 assert reply != null; 071 072 request.setAttribute(TapestryConstants.RESPONSE_RENDERER, new IOOperation<Void>() 073 { 074 public Void perform() throws IOException 075 { 076 // This is a complex area as we are trying to keep public and private services properly 077 // separated, and trying to keep stateless and stateful (i.e., perthread scope) services 078 // separated. So we inform the stateful queue service what it needs to do here ... 079 080 ContentType contentType = new ContentType(InternalConstants.JSON_MIME_TYPE, outputEncoding); 081 082 String pageName = (String) request.getAttribute(InternalConstants.PAGE_NAME_ATTRIBUTE_NAME); 083 084 MarkupWriter writer = factory.newPartialMarkupWriter(pageName); 085 086 // ... and here, the pipeline eventually reaches the PRQ to let it render the root render command. 087 088 partialMarkupRenderer.renderMarkup(writer, reply); 089 090 PrintWriter pw = response.getPrintWriter(contentType.toString()); 091 092 reply.print(pw, compactJSON); 093 094 pw.close(); 095 096 return null; 097 } 098 }); 099 } 100 101 public void renderPartialPageMarkup() throws IOException 102 { 103 renderPartialPageMarkup(new JSONObject()); 104 } 105}