| /* |
| * 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.yarn; |
| |
| import com.google.common.base.Charsets; |
| import com.google.gson.Gson; |
| import com.google.gson.GsonBuilder; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonObject; |
| import org.apache.twill.api.LocalFile; |
| import org.apache.twill.internal.appmaster.ApplicationMasterLiveNodeData; |
| import org.apache.twill.internal.json.LocalFileCodec; |
| import org.apache.twill.zookeeper.NodeData; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * A package local class to help decoding {@link NodeData} to {@link ApplicationMasterLiveNodeDecoder}. |
| * This is only used to have a central for the decoding logic, that is shared between {@link YarnTwillRunnerService} |
| * and {@link YarnTwillController}. |
| */ |
| final class ApplicationMasterLiveNodeDecoder { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ApplicationMasterLiveNodeDecoder.class); |
| private static final Gson GSON = new GsonBuilder() |
| .registerTypeAdapter(LocalFile.class, new LocalFileCodec()) |
| .create(); |
| |
| |
| /** |
| * Decodes the {@link ApplicationMasterLiveNodeData} from the given ZK node data. |
| * |
| * @return the {@link ApplicationMasterLiveNodeData} or {@code null} if failed to decode. |
| */ |
| @Nullable |
| static ApplicationMasterLiveNodeData decode(@Nullable NodeData nodeData) { |
| byte[] data = nodeData == null ? null : nodeData.getData(); |
| if (data == null) { |
| return null; |
| } |
| |
| JsonElement json = GSON.fromJson(new String(data, Charsets.UTF_8), JsonElement.class); |
| if (!json.isJsonObject()) { |
| LOG.warn("Unable to decode live data node."); |
| return null; |
| } |
| |
| JsonObject jsonObj = json.getAsJsonObject(); |
| json = jsonObj.get("data"); |
| if (json == null || !json.isJsonObject()) { |
| LOG.warn("Property data not found in live data node."); |
| return null; |
| } |
| |
| try { |
| return GSON.fromJson(json, ApplicationMasterLiveNodeData.class); |
| } catch (Exception e) { |
| LOG.warn("Failed to decode application live node data.", e); |
| return null; |
| } |
| } |
| |
| private ApplicationMasterLiveNodeDecoder() { |
| // no-op |
| } |
| } |