001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.rest.provider.consumer;
019
020import java.io.ByteArrayOutputStream;
021import java.io.IOException;
022import java.io.InputStream;
023import java.lang.annotation.Annotation;
024import java.lang.reflect.InvocationTargetException;
025import java.lang.reflect.Type;
026import org.apache.hadoop.hbase.rest.Constants;
027import org.apache.hadoop.hbase.rest.ProtobufMessageHandler;
028import org.apache.yetus.audience.InterfaceAudience;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032import org.apache.hbase.thirdparty.javax.ws.rs.Consumes;
033import org.apache.hbase.thirdparty.javax.ws.rs.WebApplicationException;
034import org.apache.hbase.thirdparty.javax.ws.rs.core.MediaType;
035import org.apache.hbase.thirdparty.javax.ws.rs.core.MultivaluedMap;
036import org.apache.hbase.thirdparty.javax.ws.rs.ext.MessageBodyReader;
037import org.apache.hbase.thirdparty.javax.ws.rs.ext.Provider;
038
039/**
040 * Adapter for hooking up Jersey content processing dispatch to ProtobufMessageHandler interface
041 * capable handlers for decoding protobuf input.
042 */
043@Provider
044@Consumes({ Constants.MIMETYPE_PROTOBUF, Constants.MIMETYPE_PROTOBUF_IETF })
045@InterfaceAudience.Private
046public class ProtobufMessageBodyConsumer implements MessageBodyReader<ProtobufMessageHandler> {
047  private static final Logger LOG = LoggerFactory.getLogger(ProtobufMessageBodyConsumer.class);
048
049  @Override
050  public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations,
051    MediaType mediaType) {
052    return ProtobufMessageHandler.class.isAssignableFrom(type);
053  }
054
055  @Override
056  public ProtobufMessageHandler readFrom(Class<ProtobufMessageHandler> type, Type genericType,
057    Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders,
058    InputStream inputStream) throws IOException, WebApplicationException {
059    ProtobufMessageHandler obj = null;
060    try {
061      obj = type.getDeclaredConstructor().newInstance();
062      ByteArrayOutputStream baos = new ByteArrayOutputStream();
063      byte[] buffer = new byte[4096];
064      int read;
065      do {
066        read = inputStream.read(buffer, 0, buffer.length);
067        if (read > 0) {
068          baos.write(buffer, 0, read);
069        }
070      } while (read > 0);
071      if (LOG.isTraceEnabled()) {
072        LOG.trace(getClass() + ": read " + baos.size() + " bytes from " + inputStream);
073      }
074      obj = obj.getObjectFromMessage(baos.toByteArray());
075    } catch (InstantiationException | NoSuchMethodException | InvocationTargetException
076      | IllegalAccessException e) {
077      throw new WebApplicationException(e);
078    }
079    return obj;
080  }
081}