| /* |
| * 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.twill.discovery; |
| |
| import com.google.common.base.Charsets; |
| import com.google.common.reflect.TypeToken; |
| import com.google.gson.Gson; |
| import com.google.gson.GsonBuilder; |
| import com.google.gson.JsonDeserializationContext; |
| import com.google.gson.JsonDeserializer; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonObject; |
| import com.google.gson.JsonParseException; |
| import com.google.gson.JsonSerializationContext; |
| import com.google.gson.JsonSerializer; |
| |
| import java.lang.reflect.Type; |
| import java.net.InetSocketAddress; |
| |
| /** |
| * Helper class to serialize and deserialize {@link Discoverable}. |
| */ |
| final class DiscoverableAdapter { |
| |
| private static final Gson GSON = |
| new GsonBuilder().registerTypeAdapter(Discoverable.class, new DiscoverableCodec()).create(); |
| private static final Type BYTE_ARRAY_TYPE = new TypeToken<byte[]>() { }.getType(); |
| |
| /** |
| * Helper function for encoding an instance of {@link Discoverable} into array of bytes. |
| * @param discoverable An instance of {@link Discoverable} |
| * @return array of bytes representing an instance of <code>discoverable</code> |
| */ |
| static byte[] encode(Discoverable discoverable) { |
| return GSON.toJson(discoverable, Discoverable.class).getBytes(Charsets.UTF_8); |
| } |
| |
| /** |
| * Helper function for decoding array of bytes into a {@link Discoverable} object. |
| * @param encoded representing serialized {@link Discoverable} |
| * @return {@code null} if encoded bytes are null; else an instance of {@link Discoverable} |
| */ |
| static Discoverable decode(byte[] encoded) { |
| if (encoded == null) { |
| return null; |
| } |
| return GSON.fromJson(new String(encoded, Charsets.UTF_8), Discoverable.class); |
| } |
| |
| private DiscoverableAdapter() { |
| } |
| |
| /** |
| * SerDe for converting a {@link Discoverable} into a JSON object |
| * or from a JSON object into {@link Discoverable}. |
| */ |
| private static final class DiscoverableCodec implements JsonSerializer<Discoverable>, JsonDeserializer<Discoverable> { |
| |
| @Override |
| public Discoverable deserialize(JsonElement json, Type typeOfT, |
| JsonDeserializationContext context) throws JsonParseException { |
| JsonObject jsonObj = json.getAsJsonObject(); |
| String service = jsonObj.get("service").getAsString(); |
| String hostname = jsonObj.get("hostname").getAsString(); |
| int port = jsonObj.get("port").getAsInt(); |
| byte[] payload = context.deserialize(jsonObj.get("payload"), BYTE_ARRAY_TYPE); |
| InetSocketAddress address = new InetSocketAddress(hostname, port); |
| return new Discoverable(service, address, payload); |
| } |
| |
| @Override |
| public JsonElement serialize(Discoverable src, Type typeOfSrc, JsonSerializationContext context) { |
| JsonObject jsonObj = new JsonObject(); |
| jsonObj.addProperty("service", src.getName()); |
| jsonObj.addProperty("hostname", src.getSocketAddress().getHostName()); |
| jsonObj.addProperty("port", src.getSocketAddress().getPort()); |
| jsonObj.add("payload", context.serialize(src.getPayload())); |
| return jsonObj; |
| } |
| } |
| } |