| /** |
| * 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.falcon.service; |
| |
| |
| import org.apache.atlas.plugin.classloader.AtlasPluginClassLoader; |
| import org.apache.falcon.FalconException; |
| import org.apache.falcon.entity.store.ConfigurationStore; |
| import org.apache.falcon.entity.v0.Entity; |
| import org.apache.falcon.service.ConfigurationChangeListener; |
| import org.apache.falcon.service.FalconService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Falcon hook used for atlas entity registration. |
| */ |
| public class AtlasService implements FalconService, ConfigurationChangeListener { |
| private static final Logger LOG = LoggerFactory.getLogger(AtlasService.class); |
| |
| private static final String ATLAS_PLUGIN_TYPE = "falcon"; |
| private static final String ATLAS_FALCON_HOOK_IMPL_CLASSNAME = "org.apache.atlas.falcon.service.AtlasService"; |
| |
| private AtlasPluginClassLoader atlasPluginClassLoader = null; |
| private FalconService falconServiceImpl = null; |
| private ConfigurationChangeListener configChangeListenerImpl = null; |
| |
| public AtlasService() { |
| this.initialize(); |
| } |
| |
| @Override |
| public String getName() { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.getName()"); |
| } |
| |
| String ret = null; |
| |
| try { |
| activatePluginClassLoader(); |
| ret = falconServiceImpl.getName(); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.getName()"); |
| } |
| |
| return ret; |
| } |
| |
| @Override |
| public void init() throws FalconException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.init()"); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| |
| ConfigurationStore.get().registerListener(this); |
| |
| falconServiceImpl.init(); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.init()"); |
| } |
| } |
| |
| @Override |
| public void destroy() throws FalconException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.destroy()"); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| |
| ConfigurationStore.get().unregisterListener(this); |
| |
| falconServiceImpl.destroy(); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.destroy()"); |
| } |
| } |
| |
| @Override |
| public void onAdd(Entity entity) throws FalconException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.onAdd({})", entity); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| configChangeListenerImpl.onAdd(entity); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.onAdd({})", entity); |
| } |
| } |
| |
| @Override |
| public void onRemove(Entity entity) throws FalconException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.onRemove({})", entity); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| configChangeListenerImpl.onRemove(entity); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.onRemove({})", entity); |
| } |
| } |
| |
| @Override |
| public void onChange(Entity entity, Entity entity1) throws FalconException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.onChange({}, {})", entity, entity1); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| configChangeListenerImpl.onChange(entity, entity1); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.onChange({}, {})", entity, entity1); |
| } |
| } |
| |
| @Override |
| public void onReload(Entity entity) throws FalconException { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.onReload({})", entity); |
| } |
| |
| try { |
| activatePluginClassLoader(); |
| configChangeListenerImpl.onReload(entity); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.onReload({})", entity); |
| } |
| } |
| |
| private void initialize() { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("==> AtlasService.initialize()"); |
| } |
| |
| try { |
| atlasPluginClassLoader = AtlasPluginClassLoader.getInstance(ATLAS_PLUGIN_TYPE, this.getClass()); |
| |
| Class<?> cls = Class.forName(ATLAS_FALCON_HOOK_IMPL_CLASSNAME, true, atlasPluginClassLoader); |
| |
| activatePluginClassLoader(); |
| |
| Object atlasService = cls.newInstance(); |
| |
| falconServiceImpl = (FalconService) atlasService; |
| configChangeListenerImpl = (ConfigurationChangeListener) atlasService; |
| } catch (Exception excp) { |
| LOG.error("Error instantiating Atlas hook implementation", excp); |
| } finally { |
| deactivatePluginClassLoader(); |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<== AtlasService.initialize()"); |
| } |
| } |
| |
| private void activatePluginClassLoader() { |
| if (atlasPluginClassLoader != null) { |
| atlasPluginClassLoader.activate(); |
| } |
| } |
| |
| private void deactivatePluginClassLoader() { |
| if (atlasPluginClassLoader != null) { |
| atlasPluginClassLoader.deactivate(); |
| } |
| } |
| } |