| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.solr.response; |
| |
| import java.io.BufferedOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.UnsupportedEncodingException; |
| import java.io.Writer; |
| import java.nio.charset.StandardCharsets; |
| import org.apache.solr.common.util.ContentStreamBase; |
| import org.apache.solr.common.util.FastWriter; |
| import org.apache.solr.request.SolrQueryRequest; |
| |
| /** Static utility methods relating to {@link QueryResponseWriter}s */ |
| public final class QueryResponseWriterUtil { |
| private QueryResponseWriterUtil() { |
| /* static helpers only */ |
| } |
| |
| /** |
| * Writes the response writer's result to the given output stream. This method inspects the |
| * specified writer to determine if it is a {@link BinaryQueryResponseWriter} or not to delegate |
| * to the appropriate method. |
| * |
| * @see BinaryQueryResponseWriter#write(OutputStream,SolrQueryRequest,SolrQueryResponse) |
| * @see BinaryQueryResponseWriter#write(Writer,SolrQueryRequest,SolrQueryResponse) |
| */ |
| public static void writeQueryResponse( |
| OutputStream outputStream, |
| QueryResponseWriter responseWriter, |
| SolrQueryRequest solrRequest, |
| SolrQueryResponse solrResponse, |
| String contentType) |
| throws IOException { |
| |
| if (responseWriter instanceof JacksonJsonWriter) { |
| JacksonJsonWriter binWriter = (JacksonJsonWriter) responseWriter; |
| BufferedOutputStream bos = new BufferedOutputStream(new NonFlushingStream(outputStream)); |
| binWriter.write(bos, solrRequest, solrResponse); |
| bos.flush(); |
| } else if (responseWriter instanceof BinaryQueryResponseWriter) { |
| BinaryQueryResponseWriter binWriter = (BinaryQueryResponseWriter) responseWriter; |
| binWriter.write(outputStream, solrRequest, solrResponse); |
| } else { |
| OutputStream out = new NonFlushingStream(outputStream); |
| Writer writer = buildWriter(out, ContentStreamBase.getCharsetFromContentType(contentType)); |
| responseWriter.write(writer, solrRequest, solrResponse); |
| writer.flush(); |
| } |
| } |
| |
| private static Writer buildWriter(OutputStream outputStream, String charset) |
| throws UnsupportedEncodingException { |
| Writer writer = |
| (charset == null) |
| ? new OutputStreamWriter(outputStream, StandardCharsets.UTF_8) |
| : new OutputStreamWriter(outputStream, charset); |
| |
| return new FastWriter(writer); |
| } |
| |
| /** |
| * Delegates write methods to an underlying {@link OutputStream}, but does not delegate {@link |
| * OutputStream#flush()}, (nor {@link OutputStream#close()}). This allows code writing to this |
| * stream to flush internal buffers without flushing the response. If we were to flush the |
| * response early, that would trigger chunked encoding. |
| * |
| * <p>See SOLR-8669. |
| */ |
| private static class NonFlushingStream extends OutputStream { |
| private final OutputStream outputStream; |
| |
| public NonFlushingStream(OutputStream outputStream) { |
| this.outputStream = outputStream; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| outputStream.write(b); |
| } |
| |
| @Override |
| public void write(byte[] b) throws IOException { |
| outputStream.write(b); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| outputStream.write(b, off, len); |
| } |
| } |
| } |