| /** |
| * 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.atlas.storm.hook; |
| |
| |
| import org.apache.atlas.plugin.classloader.AtlasPluginClassLoader; |
| import org.apache.storm.ISubmitterHook; |
| import org.apache.storm.generated.StormTopology; |
| import org.apache.storm.generated.TopologyInfo; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Map; |
| |
| /** |
| * Storm hook used for atlas entity registration. |
| */ |
| public class StormAtlasHook implements ISubmitterHook { |
| private static final Logger LOG = LoggerFactory.getLogger(StormAtlasHook.class); |
| |
| |
| private static final String ATLAS_PLUGIN_TYPE = "storm"; |
| private static final String ATLAS_STORM_HOOK_IMPL_CLASSNAME = "org.apache.atlas.storm.hook.StormAtlasHook"; |
| |
| private AtlasPluginClassLoader atlasPluginClassLoader = null; |
| private ISubmitterHook stormHook = null; |
| |
| |
| public StormAtlasHook() { |
| this.initialize(); |
| } |
| |
| @Override |
| public void notify(TopologyInfo topologyInfo, Map stormConf, StormTopology stormTopology) |
| throws IllegalAccessException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> StormAtlasHook.notify({}, {}, {})", topologyInfo, stormConf, stormTopology); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| stormHook.notify(topologyInfo, stormConf, stormTopology); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== StormAtlasHook.notify({}, {}, {})", topologyInfo, stormConf, stormTopology); |
| } |
| } |
| |
| private void initialize() { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> StormAtlasHook.initialize()"); |
| } |
| |
| try { |
| atlasPluginClassLoader = AtlasPluginClassLoader.getInstance(ATLAS_PLUGIN_TYPE, this.getClass()); |
| |
| @SuppressWarnings("unchecked") |
| Class<ISubmitterHook> cls = (Class<ISubmitterHook>) Class |
| .forName(ATLAS_STORM_HOOK_IMPL_CLASSNAME, true, atlasPluginClassLoader); |
| |
| activatePluginClassLoader(); |
| |
| stormHook = cls.newInstance(); |
| } catch (Exception excp) { |
| LOG.error("Error instantiating Atlas hook implementation", excp); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== StormAtlasHook.initialize()"); |
| } |
| } |
| |
| private void activatePluginClassLoader() { |
| if (atlasPluginClassLoader != null) { |
| atlasPluginClassLoader.activate(); |
| } |
| } |
| |
| private void deactivatePluginClassLoader() { |
| if (atlasPluginClassLoader != null) { |
| atlasPluginClassLoader.deactivate(); |
| } |
| } |
| } |