Examples of com.google.walkaround.slob.server.MutationLog

Package com.google.walkaround.slob.server

Examples of com.google.walkaround.slob.server.MutationLog

com.google.walkaround.slob.server.MutationLog
Functionality for traversing and appending to the mutation log. Use of only this class for mutating the log guarantees no corruption will occur. XXX(danilatos): Not necessarily thread safe, should only be used in a single-threaded fashion but let's make it thread safe anyway just in case... (better yet, add assertions that it's used only from one thread, so that we notice when it's not) @author danilatos@google.com (Daniel Danilatos) @author ohler@google.com (Christian Ohler)

    StateAndVersion raw;
    SlobId convId;
    StableUserId udwOwner;
    CheckedTransaction tx = datastore.beginTransaction();
    try {
      MutationLog l = udwStore.create(tx, udwId);
      ObsoleteWaveletMetadataGsonImpl metadata;
      String metadataString = l.getMetadata();
      try {
        metadata = GsonProto.fromGson(new ObsoleteWaveletMetadataGsonImpl(), metadataString);
      } catch (MessageException e) {
        throw new RuntimeException("Failed to parse obsolete metadata: " + metadataString);
      }
      Assert.check(metadata.hasUdwMetadata(), "Metadata not udw: %s, %s", udwId, metadataString);
      convId = new SlobId(metadata.getUdwMetadata().getAssociatedConvId());
      udwOwner = new StableUserId(metadata.getUdwMetadata().getOwner());
      raw = l.reconstruct(null);
    } finally {
      tx.rollback();
    }
    WaveletName waveletName = IdHack.udwWaveletNameFromConvObjectIdAndUdwObjectId(convId, udwId);
    // TODO(ohler): avoid serialization/deserialization here

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      ConvMetadata metadata = convMetadataStore.get(tx, id);
      if (metadata.hasImportMetadata()
          && !metadata.getImportMetadata().getImportFinished()) {
        throw new WaveletLockedException("Conv " + id + " locked: " + metadata);
      }
      MutationLog l = convStore.create(tx, id);
      raw = l.reconstruct(null);
    } finally {
      tx.rollback();
    }
    WaveletName waveletName = IdHack.convWaveletNameFromConvObjectId(id);
    // TODO(ohler): avoid serialization/deserialization here

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  private WaveletDataImpl loadUdw(SlobId convId, SlobId udwId)
      throws PermanentFailure, RetryableFailure {
    StateAndVersion raw;
    CheckedTransaction tx = datastore.beginTransaction();
    try {
      MutationLog l = udwStore.create(tx, udwId);
      raw = l.reconstruct(null);
    } finally {
      tx.rollback();
    }
    WaveletName waveletName = IdHack.udwWaveletNameFromConvObjectIdAndUdwObjectId(convId, udwId);
    // TODO(ohler): avoid serialization/deserialization here

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                    && !metadata.getImportMetadata().getImportFinished()) {
                  log.info(slobId + " still importing; " + participantId + " may not access");
                  return new Permissions(false, false);
                }
                // Can't use SlobStore here, that would be a cyclic dependency.
                MutationLog mutationLog = convSlobFacilities.getMutationLogFactory()
                    .create(tx, slobId);
                StateAndVersion stateAndVersion = mutationLog.reconstruct(null);
                if (stateAndVersion.getVersion() == 0) {
                  log.info(slobId + " does not exist; " + participantId + " may not access");
                  return new Permissions(false, false);
                }
                // TODO(ohler): introduce generics to avoid the cast.

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                ConvMetadata metadata = convMetadataStore.get(tx, convId);
                Assert.check(metadata.hasImportMetadata(), "%s: Metadata has no import: %s",
                    convId, metadata);
                Assert.check(metadata.getImportMetadata().getImportFinished(),
                    "%s: still importing: %s", convId, metadata);
                MutationLog l = convSlobFacilities.getMutationLogFactory().create(tx, convId);
                StateAndVersion stateAndVersion = l.reconstruct(null);
                Assert.check(stateAndVersion.getVersion() > 0, "%s at version 0: %s",
                    convId, stateAndVersion);
                // TODO(ohler): use generics to avoid the cast
                ReadableWaveletObject state = (ReadableWaveletObject) stateAndVersion.getState();
                if (state.getParticipants().contains(importingUser)) {
                  log.info(importingUser + " is a participant at version "
                      + stateAndVersion.getVersion());
                  return;
                }
                WaveletOperation op =
                    HistorySynthesizer.newAddParticipant(importingUser.getAddress(),
                        // We preserve last modified time to avoid re-ordering people's inboxes
                        // just because another participant imported.
                        state.getLastModifiedMillis(),
                        importingUser.getAddress());
                log.info(importingUser + " is not a participant at version "
                    + stateAndVersion.getVersion() + ", adding " + op);
                MutationLog.Appender appender = l.prepareAppender().getAppender();
                try {
                  appender.append(
                      new ChangeData<String>(getFakeClientId(), SERIALIZER.serializeDelta(op)));
                } catch (ChangeRejected e) {
                  throw new RuntimeException("Appender rejected AddParticipant: " + op);

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        @Nullable ChangeRejected rejected = new RetryHelper().run(
            new RetryHelper.Body<ChangeRejected>() {
              @Override public ChangeRejected run() throws RetryableFailure, PermanentFailure {
                CheckedTransaction tx = datastore.beginTransaction();
                try {
                  MutationLog mutationLog = convSlobFacilities.getMutationLogFactory().create(
                      tx, slobId);
                  MutationLog.Appender appender = mutationLog.prepareAppender().getAppender();
                  try {
                    appender.appendAll(buffer);
                  } catch (ChangeRejected e) {
                    return e;
                  }

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    if (!id.isEmpty()) {
      try {
        SlobId objectId = new SlobId(id);
        CheckedTransaction tx = datastore.beginTransaction();
        try {
          MutationLog mutationLog = storeSelector.get(storeType).getMutationLogFactory()
              .create(tx, objectId);
          objectVersion = mutationLog.getVersion();
          if (!historyStart.isEmpty()) {
            long start = Long.parseLong(historyStart);
            DeltaIterator it = mutationLog.forwardHistory(start,
                historyEnd.isEmpty() ? start + 1000 : Long.parseLong(historyEnd));
            for (long version = start; it.hasNext(); version++) {
              items.add(Pair.of(version, "" + it.next()));
            }
          }
          if (!snapshotVersion.isEmpty()) {
            snapshot = mutationLog.reconstruct(Long.parseLong(snapshotVersion))
                .getState().snapshot();
          }
        } finally {
          tx.rollback();
        }

View Full Code Here

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com.google.appengine.api.datastore.Key

com.google.appengine.api.datastore.Query

com.google.appengine.api.datastore.Text

com.google.common.collect.MapMaker

com.google.walkaround.slob.shared.ClientId

com.google.walkaround.slob.shared.SlobId

com.google.walkaround.slob.shared.StateAndVersion

com.google.walkaround.util.server.appengine.CheckedDatastore.CheckedIterator

com.google.walkaround.util.server.appengine.OversizedPropertyMover

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