| /* |
| * 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.drill.exec.store; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| |
| import org.apache.drill.common.AutoCloseables; |
| import org.apache.drill.common.logical.StoragePluginConfig; |
| |
| import org.apache.drill.shaded.guava.com.google.common.collect.LinkedListMultimap; |
| import org.apache.drill.shaded.guava.com.google.common.collect.Multimap; |
| import org.apache.drill.shaded.guava.com.google.common.collect.Multimaps; |
| import org.apache.drill.common.map.CaseInsensitiveMap; |
| |
| /** |
| * Holds maps to storage plugins. Supports name => plugin and config => plugin mappings. |
| * |
| * This is inspired by ConcurrentMap but provides a secondary key mapping that allows an alternative lookup mechanism. |
| * The class is responsible for internally managing consistency between the two maps. This class is threadsafe. |
| * Name map is case insensitive. |
| */ |
| class StoragePluginMap implements Iterable<Entry<String, StoragePlugin>>, AutoCloseable { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(StoragePluginMap.class); |
| |
| private final Map<String, StoragePlugin> nameMap = CaseInsensitiveMap.newConcurrentMap(); |
| |
| @SuppressWarnings("unchecked") |
| private final Multimap<StoragePluginConfig, StoragePlugin> configMap = |
| (Multimap<StoragePluginConfig, StoragePlugin>) (Object) |
| Multimaps.synchronizedListMultimap(LinkedListMultimap.create()); |
| |
| public void putAll(Map<String, StoragePlugin> mapOfPlugins) { |
| for (Entry<String, StoragePlugin> entry : mapOfPlugins.entrySet()) { |
| StoragePlugin plugin = entry.getValue(); |
| nameMap.put(entry.getKey(), plugin); |
| // this possibly overwrites items in a map. |
| configMap.put(plugin.getConfig(), plugin); |
| } |
| } |
| |
| public boolean replace(String name, StoragePlugin oldPlugin, StoragePlugin newPlugin) { |
| boolean ok = nameMap.replace(name, oldPlugin, newPlugin); |
| if (ok) { |
| configMap.put(newPlugin.getConfig(), newPlugin); |
| configMap.remove(oldPlugin.getConfig(), oldPlugin); |
| } |
| |
| return ok; |
| } |
| |
| public boolean remove(String name, StoragePlugin oldPlugin) { |
| boolean ok = nameMap.remove(name, oldPlugin); |
| if (ok) { |
| configMap.remove(oldPlugin.getConfig(), oldPlugin); |
| } |
| return ok; |
| } |
| |
| public void put(String name, StoragePlugin plugin) { |
| StoragePlugin oldPlugin = nameMap.put(name, plugin); |
| configMap.put(plugin.getConfig(), plugin); |
| if (oldPlugin != null) { |
| try { |
| oldPlugin.close(); |
| } catch (Exception e) { |
| logger.warn("Failure while closing plugin replaced by injection.", e); |
| } |
| } |
| } |
| |
| public StoragePlugin putIfAbsent(String name, StoragePlugin plugin) { |
| StoragePlugin oldPlugin = nameMap.putIfAbsent(name, plugin); |
| if (oldPlugin == null) { |
| configMap.put(plugin.getConfig(), plugin); |
| } |
| return oldPlugin; |
| } |
| |
| public StoragePlugin remove(String name) { |
| StoragePlugin plugin = nameMap.remove(name); |
| if (plugin != null) { |
| configMap.remove(plugin.getConfig(), plugin); |
| } |
| return plugin; |
| } |
| |
| public StoragePlugin get(String name) { |
| return nameMap.get(name); |
| } |
| |
| @Override |
| public Iterator<Entry<String, StoragePlugin>> iterator() { |
| return nameMap.entrySet().iterator(); |
| } |
| |
| /** |
| * Returns set of plugin names of this {@link StoragePluginMap} |
| * |
| * @return plugin names |
| */ |
| public Set<String> getNames() { |
| return nameMap.keySet(); |
| } |
| |
| public StoragePlugin get(StoragePluginConfig config) { |
| Collection<StoragePlugin> plugins = configMap.get(config); |
| if (plugins == null || plugins.isEmpty()) { |
| return null; |
| } else { |
| // return first one since it doesn't matter which plugin we use for ephemeral purposes (since they are all the |
| // same, they just have different names. |
| return plugins.iterator().next(); |
| } |
| } |
| |
| public Iterable<StoragePlugin> plugins() { |
| return nameMap.values(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| AutoCloseables.close(configMap.values()); |
| } |
| |
| } |