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