| /** |
| * 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.falcon.group; |
| |
| import org.apache.commons.lang.StringUtils; |
| import org.apache.falcon.FalconException; |
| import org.apache.falcon.entity.FeedHelper; |
| import org.apache.falcon.entity.v0.Entity; |
| import org.apache.falcon.entity.v0.EntityType; |
| import org.apache.falcon.entity.v0.Frequency; |
| import org.apache.falcon.entity.v0.feed.Feed; |
| import org.apache.falcon.entity.v0.feed.LocationType; |
| import org.apache.falcon.service.ConfigurationChangeListener; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Has 2 way mappings from feed to group and group to feed. |
| */ |
| public final class FeedGroupMap implements ConfigurationChangeListener { |
| |
| private static final FeedGroupMap INSTANCE = new FeedGroupMap(); |
| private Map<String, FeedGroup> groupsMapping = new ConcurrentHashMap<String, FeedGroup>(); |
| |
| private FeedGroupMap() { |
| // singleton |
| } |
| |
| public static FeedGroupMap get() { |
| return INSTANCE; |
| } |
| |
| public Map<String, FeedGroup> getGroupsMapping() { |
| return Collections.unmodifiableMap(groupsMapping); |
| } |
| |
| @Override |
| public void onAdd(Entity entity, boolean ignoreFailure) throws FalconException { |
| |
| if (entity.getEntityType().equals(EntityType.FEED)) { |
| Feed feed = (Feed) entity; |
| if (feed.getGroups() == null || feed.getGroups().equals("")) { |
| return; |
| } |
| Set<FeedGroup> groupSet = getGroups(feed); |
| addGroups(feed.getName(), groupSet); |
| } |
| |
| } |
| |
| @Override |
| public void onRemove(Entity entity) throws FalconException { |
| if (entity.getEntityType().equals(EntityType.FEED)) { |
| Feed feed = (Feed) entity; |
| if (StringUtils.isEmpty(feed.getGroups())) { |
| return; |
| } |
| String[] groups = feed.getGroups().split(","); |
| for (String group : groups) { |
| groupsMapping.get(group).getFeeds().remove(entity.getName()); |
| if (groupsMapping.get(group).getFeeds().size() == 0) { |
| groupsMapping.remove(group); |
| } |
| } |
| |
| } |
| |
| } |
| |
| @Override |
| public void onChange(Entity oldEntity, Entity newEntity) |
| throws FalconException { |
| |
| onRemove(oldEntity); |
| onAdd(newEntity, false); |
| } |
| |
| private void addGroups(String feed, Set<FeedGroup> groups) { |
| for (FeedGroup group : groups) { |
| if (groupsMapping.containsKey(group.getName())) { |
| groupsMapping.get(group.getName()).getFeeds().add(feed); |
| } else { |
| group.getFeeds().add(feed); |
| groupsMapping.put(group.getName(), group); |
| } |
| } |
| } |
| |
| public Set<FeedGroup> getGroups(String groups, Frequency frequency, String path) { |
| Set<FeedGroup> groupSet = new HashSet<FeedGroup>(); |
| String[] groupArray = groups.split(","); |
| for (String group : groupArray) { |
| groupSet.add(new FeedGroup(group, frequency, path)); |
| } |
| return groupSet; |
| } |
| |
| public Set<FeedGroup> getGroups(org.apache.falcon.entity.v0.feed.Feed feed) |
| throws FalconException { |
| return getGroups(feed.getGroups(), feed.getFrequency(), |
| FeedHelper.createStorage(feed).getUriTemplate(LocationType.DATA)); |
| } |
| } |