Java tutorial
/* * 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.gobblin.service.modules.orchestration; import java.io.Closeable; import java.io.IOException; import java.net.URI; import java.util.List; import java.util.Properties; import java.util.concurrent.Future; import org.apache.commons.codec.EncoderException; import org.apache.commons.lang3.StringUtils; import org.apache.gobblin.runtime.api.JobSpec; import org.apache.gobblin.runtime.api.Spec; import org.apache.gobblin.runtime.api.SpecProducer; import org.apache.gobblin.util.CompletedFuture; import org.apache.gobblin.util.ConfigUtils; import org.slf4j.Logger; import com.google.common.base.Optional; import com.typesafe.config.Config; import lombok.extern.slf4j.Slf4j; @Slf4j public class AzkabanSpecProducer implements SpecProducer<Spec>, Closeable { // Session Id for GaaS User private String _sessionId; private Config _config; public AzkabanSpecProducer(Config config, Optional<Logger> log) { this._config = config; try { // Initialize Azkaban client / producer and cache credentials String azkabanUsername = _config.getString(ServiceAzkabanConfigKeys.AZKABAN_USERNAME_KEY); String azkabanPassword = getAzkabanPassword(_config); String azkabanServerUrl = _config.getString(ServiceAzkabanConfigKeys.AZKABAN_SERVER_URL_KEY); _sessionId = AzkabanAjaxAPIClient.authenticateAndGetSessionId(azkabanUsername, azkabanPassword, azkabanServerUrl); } catch (IOException | EncoderException e) { throw new RuntimeException("Could not authenticate with Azkaban", e); } } private String getAzkabanPassword(Config config) { if (StringUtils.isNotBlank(System.getProperty(ServiceAzkabanConfigKeys.AZKABAN_PASSWORD_SYSTEM_KEY))) { return System.getProperty(ServiceAzkabanConfigKeys.AZKABAN_PASSWORD_SYSTEM_KEY); } return ConfigUtils.getString(config, ServiceAzkabanConfigKeys.AZKABAN_PASSWORD_KEY, StringUtils.EMPTY); } public AzkabanSpecProducer(Config config, Logger log) { this(config, Optional.of(log)); } /** Constructor with no logging */ public AzkabanSpecProducer(Config config) { this(config, Optional.<Logger>absent()); } @Override public void close() throws IOException { } @Override public Future<?> addSpec(Spec addedSpec) { // If project already exists, execute it try { AzkabanProjectConfig azkabanProjectConfig = new AzkabanProjectConfig((JobSpec) addedSpec); boolean azkabanProjectExists = AzkabanJobHelper.isAzkabanJobPresent(_sessionId, azkabanProjectConfig); // If project does not already exists, create and execute it if (azkabanProjectExists) { log.info("Executing Azkaban Project: " + azkabanProjectConfig.getAzkabanProjectName()); AzkabanJobHelper.executeJob(_sessionId, AzkabanJobHelper.getProjectId(_sessionId, azkabanProjectConfig), azkabanProjectConfig); } else { log.info("Setting up Azkaban Project: " + azkabanProjectConfig.getAzkabanProjectName()); // Deleted project also returns true if-project-exists check, so optimistically first create the project // .. (it will create project if it was never created or deleted), if project exists it will fail with // .. appropriate exception message, catch that and run in replace project mode if force overwrite is // .. specified try { createNewAzkabanProject(_sessionId, azkabanProjectConfig); } catch (IOException e) { if ("Project already exists.".equalsIgnoreCase(e.getMessage())) { if (ConfigUtils.getBoolean(((JobSpec) addedSpec).getConfig(), ServiceAzkabanConfigKeys.AZKABAN_PROJECT_OVERWRITE_IF_EXISTS_KEY, false)) { log.info("Project already exists for this Spec, but force overwrite specified"); updateExistingAzkabanProject(_sessionId, azkabanProjectConfig); } else { log.info(String.format("Azkaban project already exists: " + "%smanager?project=%s", azkabanProjectConfig.getAzkabanServerUrl(), azkabanProjectConfig.getAzkabanProjectName())); } } else { throw e; } } } } catch (IOException e) { throw new RuntimeException("Issue in setting up Azkaban project.", e); } return new CompletedFuture<>(_config, null); } @Override public Future<?> updateSpec(Spec updatedSpec) { // Re-create project AzkabanProjectConfig azkabanProjectConfig = new AzkabanProjectConfig((JobSpec) updatedSpec); try { updateExistingAzkabanProject(_sessionId, azkabanProjectConfig); } catch (IOException e) { throw new RuntimeException("Issue in setting up Azkaban project.", e); } return new CompletedFuture<>(_config, null); } @Override public Future<?> deleteSpec(URI deletedSpecURI, Properties headers) { // Delete project JobSpec jobSpec = new JobSpec.Builder(deletedSpecURI).build(); try { AzkabanJobHelper.deleteAzkabanJob(_sessionId, new AzkabanProjectConfig(jobSpec)); } catch (IOException e) { throw new RuntimeException("Issue in deleting Azkaban project.", e); } throw new UnsupportedOperationException(); } @Override public Future<? extends List<Spec>> listSpecs() { throw new UnsupportedOperationException(); } private void createNewAzkabanProject(String sessionId, AzkabanProjectConfig azkabanProjectConfig) throws IOException { // Create Azkaban Job String azkabanProjectId = AzkabanJobHelper.createAzkabanJob(sessionId, azkabanProjectConfig); // Schedule Azkaban Job AzkabanJobHelper.scheduleJob(sessionId, azkabanProjectId, azkabanProjectConfig); log.info(String.format("Azkaban project created: %smanager?project=%s", azkabanProjectConfig.getAzkabanServerUrl(), azkabanProjectConfig.getAzkabanProjectName())); } private void updateExistingAzkabanProject(String sessionId, AzkabanProjectConfig azkabanProjectConfig) throws IOException { log.info(String.format("Updating project: %smanager?project=%s", azkabanProjectConfig.getAzkabanServerUrl(), azkabanProjectConfig.getAzkabanProjectName())); // Get project Id String azkabanProjectId = AzkabanJobHelper.getProjectId(sessionId, azkabanProjectConfig); // Replace Azkaban Job AzkabanJobHelper.replaceAzkabanJob(sessionId, azkabanProjectId, azkabanProjectConfig); // Change schedule AzkabanJobHelper.changeJobSchedule(sessionId, azkabanProjectId, azkabanProjectConfig); } }