| /* |
| * 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.util; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| import java.util.function.Predicate; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.Iterators; |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.fluo.api.client.scanner.CellScanner; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| import org.apache.fluo.api.data.RowColumnValue; |
| import org.apache.fluo.core.impl.Notification; |
| |
| import static java.util.stream.Collectors.toSet; |
| |
| public class NotificationScanner implements CellScanner { |
| |
| private Iterable<Entry<Key, Value>> scanner; |
| private Predicate<RowColumnValue> filter; |
| |
| private static Predicate<RowColumnValue> createColumnFilter(Collection<Column> allColumns) { |
| if (allColumns.size() == 0) { |
| return rcv -> true; |
| } else { |
| Set<Bytes> families = allColumns.stream().filter(col -> !col.isQualifierSet()) |
| .map(col -> col.getFamily()).collect(toSet()); |
| Set<Column> columns = |
| allColumns.stream().filter(col -> col.isQualifierSet()).collect(toSet()); |
| |
| if (families.size() == 0) { |
| return rcv -> columns.contains(rcv.getColumn()); |
| } else if (columns.size() == 0) { |
| return rcv -> families.contains(rcv.getColumn().getFamily()); |
| } else { |
| return rcv -> families.contains(rcv.getColumn().getFamily()) |
| || columns.contains(rcv.getColumn()); |
| } |
| } |
| } |
| |
| NotificationScanner(Scanner scanner, Collection<Column> columns) { |
| this(scanner, createColumnFilter(columns)); |
| } |
| |
| NotificationScanner(Scanner scanner, Predicate<RowColumnValue> filter) { |
| scanner.clearColumns(); |
| Notification.configureScanner(scanner); |
| this.scanner = scanner; |
| this.filter = filter; |
| } |
| |
| @VisibleForTesting |
| NotificationScanner(Iterable<Entry<Key, Value>> scanner, Collection<Column> columns) { |
| this.scanner = scanner; |
| this.filter = createColumnFilter(columns); |
| } |
| |
| @Override |
| public Iterator<RowColumnValue> iterator() { |
| Iterator<RowColumnValue> iter = Iterators.transform(scanner.iterator(), entry -> { |
| Notification n = Notification.from(entry.getKey()); |
| return new RowColumnValue(n.getRow(), n.getColumn(), Bytes.of(entry.getValue().get())); |
| }); |
| |
| return Iterators.filter(iter, rcv -> filter.test(rcv)); |
| } |
| } |