| /* |
| * 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.integration.impl; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.fluo.api.client.Transaction; |
| import org.apache.fluo.api.client.TransactionBase; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| import org.apache.fluo.api.observer.Observer; |
| import org.apache.fluo.api.observer.ObserverProvider; |
| import org.apache.fluo.integration.ITBaseMini; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import static org.apache.fluo.api.observer.Observer.NotificationType.STRONG; |
| |
| /** |
| * Test an observer notifying the column its observing. This is a useful pattern for exporting data. |
| */ |
| public class SelfNotificationIT extends ITBaseMini { |
| |
| private static final Column STAT_COUNT_COL = new Column("stat", "count"); |
| private static final Column EXPORT_CHECK_COL = new Column("export", "check"); |
| private static final Column EXPORT_COUNT_COL = new Column("export", "count"); |
| |
| private static List<String> exports = new ArrayList<>(); |
| |
| public static class ExportingObserver implements Observer { |
| @Override |
| public void process(TransactionBase tx, Bytes row, Column col) throws Exception { |
| String r = row.toString(); |
| String currentCount = tx.gets(r, STAT_COUNT_COL); |
| String exportCount = tx.gets(r, EXPORT_COUNT_COL); |
| |
| if (exportCount != null) { |
| export(row, exportCount); |
| |
| if (currentCount == null || exportCount.equals(currentCount)) { |
| tx.delete(row, EXPORT_COUNT_COL); |
| } else { |
| tx.set(r, EXPORT_COUNT_COL, currentCount); |
| tx.set(r, EXPORT_CHECK_COL, ""); |
| } |
| } |
| } |
| |
| private void export(Bytes row, String exportCount) { |
| exports.add(exportCount); |
| } |
| } |
| |
| public static class SelfNtfyObserverProvider implements ObserverProvider { |
| @Override |
| public void provide(Registry or, Context ctx) { |
| or.register(EXPORT_COUNT_COL, STRONG, new ExportingObserver()); |
| } |
| } |
| |
| @Override |
| protected Class<? extends ObserverProvider> getObserverProviderClass() { |
| return SelfNtfyObserverProvider.class; |
| } |
| |
| @Test |
| public void test1() throws Exception { |
| |
| try (Transaction tx1 = client.newTransaction()) { |
| tx1.set("r1", STAT_COUNT_COL, "3"); |
| tx1.set("r1", EXPORT_CHECK_COL, ""); |
| tx1.set("r1", EXPORT_COUNT_COL, "3"); |
| tx1.commit(); |
| } |
| |
| miniFluo.waitForObservers(); |
| |
| Assert.assertEquals(Collections.singletonList("3"), exports); |
| exports.clear(); |
| miniFluo.waitForObservers(); |
| Assert.assertEquals(0, exports.size()); |
| |
| try (Transaction tx2 = client.newTransaction()) { |
| Assert.assertNull(tx2.gets("r1", EXPORT_COUNT_COL)); |
| |
| tx2.set("r1", STAT_COUNT_COL, "5"); |
| tx2.set("r1", EXPORT_CHECK_COL, ""); |
| tx2.set("r1", EXPORT_COUNT_COL, "4"); |
| |
| tx2.commit(); |
| } |
| |
| miniFluo.waitForObservers(); |
| Assert.assertEquals(Arrays.asList("4", "5"), exports); |
| exports.clear(); |
| miniFluo.waitForObservers(); |
| Assert.assertEquals(0, exports.size()); |
| } |
| |
| // TODO test self notification w/ weak notifications |
| } |