opendaylight/md-sal/sal-akka-raft/src/test/java/org/opendaylight/controller/cluster/raft/utils/InMemoryJournal.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.raft.utils;
   9
  10 import akka.dispatch.Futures;
  11 import akka.japi.Procedure;
  12 import akka.persistence.PersistentConfirmation;
  13 import akka.persistence.PersistentId;
  14 import akka.persistence.PersistentImpl;
  15 import akka.persistence.PersistentRepr;
  16 import akka.persistence.journal.japi.AsyncWriteJournal;
  17 import com.google.common.collect.Maps;
  18 import com.google.common.util.concurrent.Uninterruptibles;
  19 import java.util.ArrayList;
  20 import java.util.Collections;
  21 import java.util.Iterator;
  22 import java.util.List;
  23 import java.util.Map;
  24 import java.util.concurrent.Callable;
  25 import java.util.concurrent.ConcurrentHashMap;
  26 import java.util.concurrent.CountDownLatch;
  27 import java.util.concurrent.TimeUnit;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30 import scala.concurrent.Future;
  31
  32 /**
  33  * An akka AsyncWriteJournal implementation that stores data in memory. This is intended for testing.
  34  *
  35  * @author Thomas Pantelis
  36  */
  37 public class InMemoryJournal extends AsyncWriteJournal {
  38
  39     private static class WriteMessagesComplete {
  40         final CountDownLatch latch;
  41         final Class<?> ofType;
  42
  43         public WriteMessagesComplete(int count, Class<?> ofType) {
  44             this.latch = new CountDownLatch(count);
  45             this.ofType = ofType;
  46         }
  47     }
  48
  49     static final Logger LOG = LoggerFactory.getLogger(InMemoryJournal.class);
  50
  51     private static final Map<String, Map<Long, Object>> journals = new ConcurrentHashMap<>();
  52
  53     private static final Map<String, CountDownLatch> deleteMessagesCompleteLatches = new ConcurrentHashMap<>();
  54
  55     private static final Map<String, WriteMessagesComplete> writeMessagesComplete = new ConcurrentHashMap<>();
  56
  57     private static final Map<String, CountDownLatch> blockReadMessagesLatches = new ConcurrentHashMap<>();
  58
  59     public static void addEntry(String persistenceId, long sequenceNr, Object data) {
  60         Map<Long, Object> journal = journals.get(persistenceId);
  61         if(journal == null) {
  62             journal = Maps.newLinkedHashMap();
  63             journals.put(persistenceId, journal);
  64         }
  65
  66         synchronized (journal) {
  67             journal.put(sequenceNr, data);
  68         }
  69     }
  70
  71     public static void clear() {
  72         journals.clear();
  73     }
  74
  75     @SuppressWarnings("unchecked")
  76     public static <T> List<T> get(String persistenceId, Class<T> type) {
  77         Map<Long, Object> journalMap = journals.get(persistenceId);
  78         if(journalMap == null) {
  79             return Collections.<T>emptyList();
  80         }
  81
  82         synchronized (journalMap) {
  83             List<T> journal = new ArrayList<>(journalMap.size());
  84             for(Object entry: journalMap.values()) {
  85                 if(type.isInstance(entry)) {
  86                     journal.add((T) entry);
  87                 }
  88             }
  89
  90             return journal;
  91         }
  92     }
  93
  94     public static Map<Long, Object> get(String persistenceId) {
  95         Map<Long, Object> journalMap = journals.get(persistenceId);
  96         return journalMap != null ? journalMap : Collections.<Long, Object>emptyMap();
  97     }
  98
  99     public static void dumpJournal(String persistenceId) {
 100         StringBuilder builder = new StringBuilder(String.format("Journal log for %s:", persistenceId));
 101         Map<Long, Object> journalMap = journals.get(persistenceId);
 102         if(journalMap != null) {
 103             synchronized (journalMap) {
 104                 for(Map.Entry<Long, Object> e: journalMap.entrySet()) {
 105                     builder.append("\n    ").append(e.getKey()).append(" = ").append(e.getValue());
 106                 }
 107             }
 108         }
 109
 110         LOG.info(builder.toString());
 111     }
 112
 113     public static void waitForDeleteMessagesComplete(String persistenceId) {
 114         if(!Uninterruptibles.awaitUninterruptibly(deleteMessagesCompleteLatches.get(persistenceId), 5, TimeUnit.SECONDS)) {
 115             throw new AssertionError("Delete messages did not complete");
 116         }
 117     }
 118
 119     public static void waitForWriteMessagesComplete(String persistenceId) {
 120         if(!Uninterruptibles.awaitUninterruptibly(writeMessagesComplete.get(persistenceId).latch, 5, TimeUnit.SECONDS)) {
 121             throw new AssertionError("Journal write messages did not complete");
 122         }
 123     }
 124
 125     public static void addDeleteMessagesCompleteLatch(String persistenceId) {
 126         deleteMessagesCompleteLatches.put(persistenceId, new CountDownLatch(1));
 127     }
 128
 129     public static void addWriteMessagesCompleteLatch(String persistenceId, int count) {
 130         writeMessagesComplete.put(persistenceId, new WriteMessagesComplete(count, null));
 131     }
 132
 133     public static void addWriteMessagesCompleteLatch(String persistenceId, int count, Class<?> ofType) {
 134         writeMessagesComplete.put(persistenceId, new WriteMessagesComplete(count, ofType));
 135     }
 136
 137     public static void addBlockReadMessagesLatch(String persistenceId, CountDownLatch latch) {
 138         blockReadMessagesLatches.put(persistenceId, latch);
 139     }
 140
 141     @Override
 142     public Future<Void> doAsyncReplayMessages(final String persistenceId, long fromSequenceNr,
 143             long toSequenceNr, long max, final Procedure<PersistentRepr> replayCallback) {
 144         return Futures.future(new Callable<Void>() {
 145             @Override
 146             public Void call() throws Exception {
 147                 CountDownLatch blockLatch = blockReadMessagesLatches.remove(persistenceId);
 148                 if(blockLatch != null) {
 149                     Uninterruptibles.awaitUninterruptibly(blockLatch);
 150                 }
 151
 152                 Map<Long, Object> journal = journals.get(persistenceId);
 153                 if(journal == null) {
 154                     return null;
 155                 }
 156
 157                 synchronized (journal) {
 158                     for (Map.Entry<Long,Object> entry : journal.entrySet()) {
 159                         PersistentRepr persistentMessage =
 160                                 new PersistentImpl(entry.getValue(), entry.getKey(), persistenceId,
 161                                         false, null, null);
 162                         replayCallback.apply(persistentMessage);
 163                     }
 164                 }
 165
 166                 return null;
 167             }
 168         }, context().dispatcher());
 169     }
 170
 171     @Override
 172     public Future<Long> doAsyncReadHighestSequenceNr(String persistenceId, long fromSequenceNr) {
 173         // Akka calls this during recovery.
 174
 175         Map<Long, Object> journal = journals.get(persistenceId);
 176         if(journal == null) {
 177             return Futures.successful(-1L);
 178         }
 179
 180         synchronized (journal) {
 181             long highest = -1;
 182             for (Long seqNr : journal.keySet()) {
 183                 if(seqNr.longValue() >= fromSequenceNr && seqNr.longValue() > highest) {
 184                     highest = seqNr.longValue();
 185                 }
 186             }
 187
 188             return Futures.successful(highest);
 189         }
 190     }
 191
 192     @Override
 193     public Future<Void> doAsyncWriteMessages(final Iterable<PersistentRepr> messages) {
 194         return Futures.future(new Callable<Void>() {
 195             @Override
 196             public Void call() throws Exception {
 197                 for (PersistentRepr repr : messages) {
 198                     Map<Long, Object> journal = journals.get(repr.persistenceId());
 199                     if(journal == null) {
 200                         journal = Maps.newLinkedHashMap();
 201                         journals.put(repr.persistenceId(), journal);
 202                     }
 203
 204                     synchronized (journal) {
 205                         LOG.trace("doAsyncWriteMessages: id: {}: seqNr: {}, payload: {}", repr.persistenceId(),
 206                                 repr.sequenceNr(), repr.payload());
 207                         journal.put(repr.sequenceNr(), repr.payload());
 208                     }
 209
 210                     WriteMessagesComplete complete = writeMessagesComplete.get(repr.persistenceId());
 211                     if(complete != null) {
 212                         if(complete.ofType == null || complete.ofType.equals(repr.payload().getClass())) {
 213                             complete.latch.countDown();
 214                         }
 215                     }
 216                 }
 217
 218                 return null;
 219             }
 220         }, context().dispatcher());
 221     }
 222
 223     @Override
 224     public Future<Void> doAsyncWriteConfirmations(Iterable<PersistentConfirmation> confirmations) {
 225         return Futures.successful(null);
 226     }
 227
 228     @Override
 229     public Future<Void> doAsyncDeleteMessages(Iterable<PersistentId> messageIds, boolean permanent) {
 230         return Futures.successful(null);
 231     }
 232
 233     @Override
 234     public Future<Void> doAsyncDeleteMessagesTo(String persistenceId, long toSequenceNr, boolean permanent) {
 235         LOG.trace("doAsyncDeleteMessagesTo: {}", toSequenceNr);
 236         Map<Long, Object> journal = journals.get(persistenceId);
 237         if(journal != null) {
 238             synchronized (journal) {
 239                 Iterator<Long> iter = journal.keySet().iterator();
 240                 while(iter.hasNext()) {
 241                     Long n = iter.next();
 242                     if(n <= toSequenceNr) {
 243                         iter.remove();
 244                     }
 245                 }
 246             }
 247         }
 248
 249         CountDownLatch latch = deleteMessagesCompleteLatches.get(persistenceId);
 250         if(latch != null) {
 251             latch.countDown();
 252         }
 253
 254         return Futures.successful(null);
 255     }
 256 }