| // Copyright 2017 Twitter. All rights reserved. |
| // |
| // Licensed 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 com.twitter.heron.eco.parser; |
| |
| import java.io.InputStream; |
| |
| import org.yaml.snakeyaml.TypeDescription; |
| import org.yaml.snakeyaml.Yaml; |
| import org.yaml.snakeyaml.constructor.Constructor; |
| |
| import com.twitter.heron.eco.definition.BoltDefinition; |
| import com.twitter.heron.eco.definition.EcoTopologyDefinition; |
| import com.twitter.heron.eco.definition.SpoutDefinition; |
| |
| public class EcoParser { |
| |
| public EcoTopologyDefinition parseFromInputStream(InputStream inputStream) |
| throws Exception { |
| |
| Yaml yaml = topologyYaml(); |
| |
| if (inputStream == null) { |
| throw new Exception("Unable to load eco input stream"); |
| } |
| return loadTopologyFromYaml(yaml, inputStream); |
| } |
| |
| private EcoTopologyDefinition loadTopologyFromYaml(Yaml yaml, InputStream inputStream) { |
| return (EcoTopologyDefinition) yaml.load(inputStream); |
| } |
| private static Yaml topologyYaml() { |
| Constructor topologyConstructor = new Constructor(EcoTopologyDefinition.class); |
| |
| TypeDescription topologyDescription = new TypeDescription(EcoTopologyDefinition.class); |
| |
| topologyDescription.putListPropertyType("spouts", SpoutDefinition.class); |
| topologyDescription.putListPropertyType("bolts", BoltDefinition.class); |
| topologyConstructor.addTypeDescription(topologyDescription); |
| |
| return new Yaml(topologyConstructor); |
| } |
| } |