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Diffstat (limited to 'sql/hive-thriftserver/src/main/java/org/apache/hive/service/CompositeService.java')
-rw-r--r-- | sql/hive-thriftserver/src/main/java/org/apache/hive/service/CompositeService.java | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/sql/hive-thriftserver/src/main/java/org/apache/hive/service/CompositeService.java b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/CompositeService.java new file mode 100644 index 0000000000..897911872b --- /dev/null +++ b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/CompositeService.java @@ -0,0 +1,133 @@ +/** + * 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.hive.service; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.List; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.apache.hadoop.hive.conf.HiveConf; + +/** + * CompositeService. + * + */ +public class CompositeService extends AbstractService { + + private static final Log LOG = LogFactory.getLog(CompositeService.class); + + private final List<Service> serviceList = new ArrayList<Service>(); + + public CompositeService(String name) { + super(name); + } + + public Collection<Service> getServices() { + return Collections.unmodifiableList(serviceList); + } + + protected synchronized void addService(Service service) { + serviceList.add(service); + } + + protected synchronized boolean removeService(Service service) { + return serviceList.remove(service); + } + + @Override + public synchronized void init(HiveConf hiveConf) { + for (Service service : serviceList) { + service.init(hiveConf); + } + super.init(hiveConf); + } + + @Override + public synchronized void start() { + int i = 0; + try { + for (int n = serviceList.size(); i < n; i++) { + Service service = serviceList.get(i); + service.start(); + } + super.start(); + } catch (Throwable e) { + LOG.error("Error starting services " + getName(), e); + // Note that the state of the failed service is still INITED and not + // STARTED. Even though the last service is not started completely, still + // call stop() on all services including failed service to make sure cleanup + // happens. + stop(i); + throw new ServiceException("Failed to Start " + getName(), e); + } + + } + + @Override + public synchronized void stop() { + if (this.getServiceState() == STATE.STOPPED) { + // The base composite-service is already stopped, don't do anything again. + return; + } + if (serviceList.size() > 0) { + stop(serviceList.size() - 1); + } + super.stop(); + } + + private synchronized void stop(int numOfServicesStarted) { + // stop in reserve order of start + for (int i = numOfServicesStarted; i >= 0; i--) { + Service service = serviceList.get(i); + try { + service.stop(); + } catch (Throwable t) { + LOG.info("Error stopping " + service.getName(), t); + } + } + } + + /** + * JVM Shutdown hook for CompositeService which will stop the given + * CompositeService gracefully in case of JVM shutdown. + */ + public static class CompositeServiceShutdownHook implements Runnable { + + private final CompositeService compositeService; + + public CompositeServiceShutdownHook(CompositeService compositeService) { + this.compositeService = compositeService; + } + + @Override + public void run() { + try { + // Stop the Composite Service + compositeService.stop(); + } catch (Throwable t) { + LOG.info("Error stopping " + compositeService.getName(), t); + } + } + } + + +} |