| /* |
| * 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.samza.table.utils; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.GsonBuilder; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.stream.JsonReader; |
| import com.google.gson.stream.JsonWriter; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.lang.reflect.Modifier; |
| import java.util.Base64; |
| |
| import org.apache.samza.SamzaException; |
| |
| |
| public final class SerdeUtils { |
| /** |
| * Helper method to serialize Java objects as Base64 strings |
| * @param name name of the object (for error reporting) |
| * @param object object to be serialized |
| * @return Base64 representation of the object |
| * @param <T> type of the object |
| */ |
| public static <T> String serialize(String name, T object) { |
| try (ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| ObjectOutputStream oos = new ObjectOutputStream(baos)) { |
| oos.writeObject(object); |
| return Base64.getEncoder().encodeToString(baos.toByteArray()); |
| } catch (IOException e) { |
| throw new SamzaException("Failed to serialize " + name, e); |
| } |
| } |
| |
| /** |
| * Helper method to deserialize Java objects from Base64 strings |
| * @param name name of the object (for error reporting) |
| * @param strObject base64 string of the serialized object |
| * @return deserialized object instance |
| * @param <T> type of the object |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> T deserialize(String name, String strObject) { |
| try { |
| byte[] bytes = Base64.getDecoder().decode(strObject); |
| return (T) new ObjectInputStream(new ByteArrayInputStream(bytes)).readObject(); |
| } catch (Exception e) { |
| String errMsg = "Failed to deserialize " + name; |
| throw new SamzaException(errMsg, e); |
| } |
| } |
| |
| /** |
| * Helper method to serialize Java objects as json strings |
| * @param name name of object used for logging |
| * @param object object to be serialized |
| * @return Json representation of the object |
| */ |
| public static String toJson(String name, Object object) { |
| final Gson gson = new GsonBuilder().excludeFieldsWithModifiers(Modifier.TRANSIENT, Modifier.STATIC) |
| // Tells Gson how to serialize fields with type of Class. |
| .registerTypeHierarchyAdapter(Class.class, new TypeAdapter<Class>() { |
| @Override |
| public void write(JsonWriter out, Class value) throws IOException { |
| if (value == null) { |
| out.nullValue(); |
| } else { |
| out.value(value.getName()); |
| } |
| } |
| |
| @Override |
| public Class read(JsonReader in) { |
| throw new SamzaException("Deserialization from json is not supported."); |
| } |
| }).create(); |
| try { |
| return gson.toJson(object); |
| } catch (Exception e) { |
| throw new SamzaException(String.format("Failed to serialize %s to json", name), e); |
| } |
| } |
| } |