| /* |
| * 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.flink.api.common.serialization; |
| |
| import org.apache.flink.annotation.Public; |
| import org.apache.flink.api.common.ExecutionConfig; |
| import org.apache.flink.api.common.typeinfo.TypeInformation; |
| import org.apache.flink.api.common.typeutils.TypeSerializer; |
| import org.apache.flink.core.memory.DataInputDeserializer; |
| import org.apache.flink.core.memory.DataOutputSerializer; |
| |
| import java.io.IOException; |
| |
| import static org.apache.flink.util.Preconditions.checkNotNull; |
| |
| /** |
| * A serialization and deserialization schema that uses Flink's serialization stack to |
| * transform typed from and to byte arrays. |
| * |
| * @param <T> The type to be serialized. |
| */ |
| @Public |
| public class TypeInformationSerializationSchema<T> implements DeserializationSchema<T>, SerializationSchema<T> { |
| |
| private static final long serialVersionUID = -5359448468131559102L; |
| |
| /** The type information, to be returned by {@link #getProducedType()}. */ |
| private final TypeInformation<T> typeInfo; |
| |
| /** The serializer for the actual de-/serialization. */ |
| private final TypeSerializer<T> serializer; |
| |
| /** The reusable output serialization buffer. */ |
| private transient DataOutputSerializer dos; |
| |
| /** The reusable input deserialization buffer. */ |
| private transient DataInputDeserializer dis; |
| |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Creates a new de-/serialization schema for the given type. |
| * |
| * @param typeInfo The type information for the type de-/serialized by this schema. |
| * @param ec The execution config, which is used to parametrize the type serializers. |
| */ |
| public TypeInformationSerializationSchema(TypeInformation<T> typeInfo, ExecutionConfig ec) { |
| this.typeInfo = checkNotNull(typeInfo, "typeInfo"); |
| this.serializer = typeInfo.createSerializer(ec); |
| } |
| |
| /** |
| * Creates a new de-/serialization schema for the given type. |
| * |
| * @param typeInfo The type information for the type de-/serialized by this schema. |
| * @param serializer The serializer to use for de-/serialization. |
| */ |
| public TypeInformationSerializationSchema(TypeInformation<T> typeInfo, TypeSerializer<T> serializer) { |
| this.typeInfo = checkNotNull(typeInfo, "typeInfo"); |
| this.serializer = checkNotNull(serializer, "serializer"); |
| } |
| |
| // ------------------------------------------------------------------------ |
| |
| @Override |
| public T deserialize(byte[] message) { |
| if (dis != null) { |
| dis.setBuffer(message); |
| } else { |
| dis = new DataInputDeserializer(message); |
| } |
| |
| try { |
| return serializer.deserialize(dis); |
| } |
| catch (IOException e) { |
| throw new RuntimeException("Unable to deserialize message", e); |
| } |
| } |
| |
| /** |
| * This schema never considers an element to signal end-of-stream, so this method returns always false. |
| * @param nextElement The element to test for the end-of-stream signal. |
| * @return Returns false. |
| */ |
| @Override |
| public boolean isEndOfStream(T nextElement) { |
| return false; |
| } |
| |
| @Override |
| public byte[] serialize(T element) { |
| if (dos == null) { |
| dos = new DataOutputSerializer(16); |
| } |
| |
| try { |
| serializer.serialize(element, dos); |
| } |
| catch (IOException e) { |
| throw new RuntimeException("Unable to serialize record", e); |
| } |
| |
| byte[] ret = dos.getCopyOfBuffer(); |
| dos.clear(); |
| return ret; |
| } |
| |
| @Override |
| public TypeInformation<T> getProducedType() { |
| return typeInfo; |
| } |
| } |