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