| /* |
| * 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.fluo.core.impl; |
| |
| import java.util.Set; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.cache.Cache; |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.Weigher; |
| import org.apache.accumulo.core.security.ColumnVisibility; |
| import org.apache.fluo.api.config.FluoConfiguration; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| import org.apache.fluo.core.util.ByteUtil; |
| |
| /** |
| * Parsing Column visibilities can be expensive. This class provides a cache of parsed visibility |
| * objects. |
| */ |
| |
| public class VisibilityCache { |
| |
| public static final ColumnVisibility EMPTY_VIS = new ColumnVisibility(); |
| |
| private static class VisWeigher implements Weigher<Bytes, ColumnVisibility> { |
| @Override |
| public int weigh(Bytes key, ColumnVisibility vis) { |
| return key.length() + vis.getExpression().length + 32; |
| } |
| } |
| |
| private final Cache<Bytes, ColumnVisibility> visCache; |
| |
| VisibilityCache(FluoConfiguration conf) { |
| visCache = CacheBuilder.newBuilder() |
| .expireAfterAccess(FluoConfigurationImpl.getVisibilityCacheTimeout(conf, TimeUnit.MILLISECONDS), |
| TimeUnit.MILLISECONDS) |
| .maximumWeight(FluoConfigurationImpl.getVisibilityCacheSize(conf)).weigher(new VisWeigher()) |
| .concurrencyLevel(10).build(); |
| } |
| |
| public ColumnVisibility getCV(Column col) { |
| return getCV(col.getVisibility()); |
| } |
| |
| public ColumnVisibility getCV(final Bytes colvis) { |
| if (colvis.length() == 0) { |
| return EMPTY_VIS; |
| } |
| |
| try { |
| return visCache.get(colvis, new Callable<ColumnVisibility>() { |
| @Override |
| public ColumnVisibility call() throws Exception { |
| return new ColumnVisibility(ByteUtil.toText(colvis)); |
| } |
| }); |
| } catch (ExecutionException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public void validate(Column col) { |
| getCV(col.getVisibility()); |
| } |
| |
| public void validate(Set<Column> columns) { |
| for (Column column : columns) { |
| validate(column); |
| } |
| |
| } |
| |
| } |