| /* |
| * 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.beam.sdk.io.gcp.pubsub; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Map; |
| import org.apache.beam.sdk.coders.ByteArrayCoder; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CustomCoder; |
| import org.apache.beam.sdk.coders.MapCoder; |
| import org.apache.beam.sdk.coders.NullableCoder; |
| import org.apache.beam.sdk.coders.StringUtf8Coder; |
| import org.apache.beam.sdk.values.TypeDescriptor; |
| |
| /** A coder for PubsubMessage including attributes and the message id from the PubSub server. */ |
| public class PubsubMessageWithAttributesAndMessageIdCoder extends CustomCoder<PubsubMessage> { |
| // A message's payload cannot be null |
| private static final Coder<byte[]> PAYLOAD_CODER = ByteArrayCoder.of(); |
| // A message's attributes can be null. |
| private static final Coder<Map<String, String>> ATTRIBUTES_CODER = |
| NullableCoder.of(MapCoder.of(StringUtf8Coder.of(), StringUtf8Coder.of())); |
| // A message's messageId cannot be null |
| private static final Coder<String> MESSAGE_ID_CODER = StringUtf8Coder.of(); |
| |
| public static Coder<PubsubMessage> of(TypeDescriptor<PubsubMessage> ignored) { |
| return of(); |
| } |
| |
| public static PubsubMessageWithAttributesAndMessageIdCoder of() { |
| return new PubsubMessageWithAttributesAndMessageIdCoder(); |
| } |
| |
| @Override |
| public void encode(PubsubMessage value, OutputStream outStream) throws IOException { |
| PAYLOAD_CODER.encode(value.getPayload(), outStream); |
| ATTRIBUTES_CODER.encode(value.getAttributeMap(), outStream); |
| MESSAGE_ID_CODER.encode(value.getMessageId(), outStream); |
| } |
| |
| @Override |
| public PubsubMessage decode(InputStream inStream) throws IOException { |
| byte[] payload = PAYLOAD_CODER.decode(inStream); |
| Map<String, String> attributes = ATTRIBUTES_CODER.decode(inStream); |
| String messageId = MESSAGE_ID_CODER.decode(inStream); |
| return new PubsubMessage(payload, attributes, messageId); |
| } |
| } |