| /** |
| * 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 com.datatorrent.stram.plan.logical; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.slf4j.Logger; |
| |
| import org.apache.apex.api.plugin.DAGSetupEvent; |
| import org.apache.apex.api.plugin.DAGSetupPlugin; |
| import org.apache.apex.api.plugin.Plugin.EventHandler; |
| import org.apache.apex.engine.plugin.loaders.PropertyBasedPluginLocator; |
| import org.apache.hadoop.conf.Configuration; |
| |
| import com.google.common.collect.HashBasedTable; |
| import com.google.common.collect.Table; |
| |
| import com.datatorrent.api.Attribute; |
| import com.datatorrent.api.DAG; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| public class DAGSetupPluginManager |
| { |
| private static final Logger LOG = getLogger(DAGSetupPluginManager.class); |
| |
| private final transient List<DAGSetupPlugin> plugins = new ArrayList<>(); |
| private Configuration conf; |
| |
| public static final String DAGSETUP_PLUGINS_CONF_KEY = "apex.plugin.dag.setup"; |
| |
| private final Table<DAGSetupEvent.Type, DAGSetupPlugin, EventHandler<DAGSetupEvent>> table = HashBasedTable.create(); |
| |
| private void loadVisitors(Configuration conf) |
| { |
| this.conf = conf; |
| if (!plugins.isEmpty()) { |
| return; |
| } |
| |
| PropertyBasedPluginLocator<DAGSetupPlugin> locator = new PropertyBasedPluginLocator<>(DAGSetupPlugin.class, DAGSETUP_PLUGINS_CONF_KEY); |
| this.plugins.addAll(locator.discoverPlugins(conf)); |
| } |
| |
| private class DefaultDAGSetupPluginContext implements DAGSetupPlugin.Context<DAGSetupEvent> |
| { |
| private final DAG dag; |
| private final Configuration conf; |
| private DAGSetupPlugin plugin; |
| |
| public DefaultDAGSetupPluginContext(DAG dag, Configuration conf, DAGSetupPlugin plugin) |
| { |
| this.dag = dag; |
| this.conf = conf; |
| this.plugin = plugin; |
| } |
| |
| @Override |
| public void register(DAGSetupEvent.Type type, EventHandler<DAGSetupEvent> handler) |
| { |
| table.put(type, plugin, handler); |
| } |
| |
| public DAG getDAG() |
| { |
| return dag; |
| } |
| |
| public Configuration getConfiguration() |
| { |
| return conf; |
| } |
| |
| @Override |
| public Attribute.AttributeMap getAttributes() |
| { |
| throw new UnsupportedOperationException("Not supported yet."); |
| } |
| |
| @Override |
| public <T> T getValue(Attribute<T> key) |
| { |
| throw new UnsupportedOperationException("Not supported yet."); |
| } |
| |
| @Override |
| public void setCounters(Object counters) |
| { |
| throw new UnsupportedOperationException("Not supported yet."); |
| } |
| |
| @Override |
| public void sendMetrics(Collection<String> metricNames) |
| { |
| throw new UnsupportedOperationException("Not supported yet."); |
| } |
| } |
| |
| public void setup(DAG dag) |
| { |
| for (DAGSetupPlugin plugin : plugins) { |
| DAGSetupPlugin.Context context = new DefaultDAGSetupPluginContext(dag, conf, plugin); |
| plugin.setup(context); |
| } |
| } |
| |
| public void teardown() |
| { |
| for (DAGSetupPlugin plugin : plugins) { |
| plugin.teardown(); |
| } |
| } |
| |
| public void dispatch(DAGSetupEvent event) |
| { |
| for (EventHandler<DAGSetupEvent> handler : table.row(event.getType()).values()) { |
| try { |
| handler.handle(event); |
| } catch (RuntimeException e) { |
| LOG.warn("Event {} caused an exception in {} handler", event, handler, e); |
| } |
| } |
| } |
| |
| public static synchronized DAGSetupPluginManager getInstance(Configuration conf) |
| { |
| DAGSetupPluginManager manager = new DAGSetupPluginManager(); |
| manager.loadVisitors(conf); |
| return manager; |
| } |
| } |