/**
* Deserializes the snapshot contained in the {@link WaveletSnapshot} into an {@link
* ObservableWaveletData}.
*
* @param snapshot the {@link WaveletSnapshot} to deserialize.
* @throws OperationException if the ops in the snapshot can not be applied.
* @throws InvalidParticipantAddress
* @throws InvalidIdException
*/
public static ObservableWaveletData deserializeWavelet(WaveletSnapshot snapshot, WaveId waveId)
throws OperationException, InvalidParticipantAddress, InvalidIdException {
ObservableWaveletData.Factory<? extends ObservableWaveletData> factory =
WaveletDataImpl.Factory.create(
ObservablePluggableMutableDocument.createFactory(SchemaCollection.empty()));
ParticipantId author = ParticipantId.of(snapshot.getCreator());
WaveletId waveletId = ModernIdSerialiser.INSTANCE.deserialiseWaveletId(snapshot.getWaveletId());
long creationTime = snapshot.getCreationTime();
ObservableWaveletData wavelet =
factory.create(
new EmptyWaveletSnapshot(
waveId,
waveletId,
author,
CoreWaveletOperationSerializer.deserialize(snapshot.getVersion()),
creationTime));
for (String participant : snapshot.getParticipantIdList()) {
wavelet.addParticipant(getParticipantId(participant));
}
for (DocumentSnapshot document : snapshot.getDocumentList()) {
addDocumentSnapshotToWavelet(document, wavelet);
}
wavelet.setVersion(snapshot.getVersion().getVersion());
wavelet.setLastModifiedTime(snapshot.getLastModifiedTime());
// The creator and creation time are set when the empty wavelet template is
// created above.
return wavelet;
}
/**
* Reverses the operations detailed in the list of deltas on the given wavelet.
*
* @param wavelet {@link ObservableWaveletData} to apply operations to
* @param deltas the {@link WaveletDelta} containing the operations which we should revert on the
* given wavelet.
* @throws OperationException if the operations can not be rolled back.
*/
private static void rollback(ObservableWaveletData wavelet, List<TransformedWaveletDelta> deltas)
throws OperationException {
List<WaveletOperation> inverseOps = Lists.newArrayList();
// Go through everything in reverse order
for (int i = deltas.size() - 1; i >= 0; i--) {
TransformedWaveletDelta delta = deltas.get(i);
// Metadata such as the last modified ts will change due to the rollback
// of operations.
for (int j = delta.size() - 1; j >= 0; j--) {
WaveletOperation op = delta.get(j);
WaveletOperation inverseOp = WaveletOperationInverter.invert(op);
inverseOps.add(inverseOp);
}
}
long startVersion = wavelet.getVersion();
int opCount = 0;
for (WaveletOperation inverseOp : inverseOps) {
inverseOp.apply(wavelet);
opCount++;
}
if (wavelet.getVersion() != startVersion - opCount) {
throw new OperationException(
"Expected end version "
+ (startVersion - opCount)
+ " doesn't match the version of the wavelet "
+ wavelet.getVersion());
}
}
private ParticipantId computeCreator(WaveViewData wave) {
for (ObservableWaveletData wavelet : wave.getWavelets()) {
if (IdUtil.isConversationRootWaveletId(wavelet.getWaveletId())) {
return wavelet.getCreator();
}
}
// If not found creator - compare with UNKNOWN_CREATOR;
return UNKNOWN_CREATOR;
}
private long computeCreatedTime(WaveViewData wave) {
long creationTime = -1;
for (ObservableWaveletData wavelet : wave.getWavelets()) {
creationTime =
creationTime < wavelet.getCreationTime()
? wavelet.getCreationTime()
: creationTime;
}
return creationTime;
}
private long computeLmt(WaveViewData wave) {
long lmt = -1;
for (ObservableWaveletData wavelet : wave.getWavelets()) {
// Skip non conversational wavelets.
if (!IdUtil.isConversationalId(wavelet.getWaveletId())) {
continue;
}
lmt = lmt < wavelet.getLastModifiedTime() ? wavelet.getLastModifiedTime() : lmt;
}
return lmt;
}
/**
* Verifies whether the wavelet matches the filter criteria.
*
* @param wavelet the wavelet.
* @param user the logged in user.
* @param withList the list of participants to be used in 'with' filter.
* @param creatorList the list of participants to be used in 'creator' filter.
* @param isAllQuery true if the search results should include shared for this domain waves.
*/
private boolean matches(
ObservableWaveletData wavelet,
ParticipantId user,
ParticipantId sharedDomainParticipantId,
List<ParticipantId> withList,
List<ParticipantId> creatorList,
boolean isAllQuery)
throws WaveletStateException {
// If it is user data wavelet for the user - return true.
if (IdUtil.isUserDataWavelet(wavelet.getWaveletId()) && wavelet.getCreator().equals(user)) {
return true;
}
// Filter by creator. This is the fastest check so we perform it first.
for (ParticipantId creator : creatorList) {
if (!creator.equals(wavelet.getCreator())) {
// Skip.
return false;
}
}
// The wavelet should have logged in user as participant for 'in:inbox'
// query.
if (!isAllQuery && !wavelet.getParticipants().contains(user)) {
return false;
}
// Or if it is an 'all' query - then either logged in user or shared domain
// participant should be present in the wave.
if (isAllQuery
&& !WaveletDataUtil.checkAccessPermission(wavelet, user, sharedDomainParticipantId)) {
return false;
}
// If not returned 'false' above - then logged in user is either
// explicit or implicit participant and therefore has access permission.
// Now filter by 'with'.
for (ParticipantId otherUser : withList) {
if (!wavelet.getParticipants().contains(otherUser)) {
// Skip.
return false;
}
}
return true;
}
@Override
public void onOperationChannelCreated(
OperationChannel channel, ObservableWaveletData snapshot, Accessibility accessibility) {
WaveletId wid = snapshot.getWaveletId();
String id = ModernIdSerialiser.INSTANCE.serialiseWaveletId(wid);
Preconditions.checkState(!channels.containsKey(id));
channels.put(id, channel);
if (wave.getWavelet(wid) != null) {
connect(id);
} else {
// This will trigger the onWaveletAdded callback above.
wave.addWavelet(operationalizer.operationalize(snapshot));
}
}
/** Opens a mux, binding its operation channels with operation-supporting wavelets. */
public static void openAndBind(
WaveletOperationalizer operationalizer,
WaveViewImpl<OpBasedWavelet> wave,
WaveDocuments<? extends CcDocument> docRegistry,
OperationChannelMultiplexer mux,
IdFilter filter,
Command whenOpened) {
StaticChannelBinder staticBinder = new StaticChannelBinder(operationalizer, docRegistry);
LiveChannelBinder liveBinder =
new LiveChannelBinder(staticBinder, operationalizer, wave, mux, whenOpened);
final Collection<KnownWavelet> remoteWavelets = CollectionUtils.createQueue();
final Collection<ObservableWaveletData> localWavelets = CollectionUtils.createQueue();
for (ObservableWaveletData wavelet : operationalizer.getWavelets()) {
// Version 0 wavelets must be wavelets that the client has created in this
// session. They are not to be included in the known-wavelet collection,
// because the server does not know about them.
if (wavelet.getVersion() > 0) {
remoteWavelets.add(
new KnownWavelet(wavelet, wavelet.getHashedVersion(), Accessibility.READ_WRITE));
} else {
localWavelets.add(wavelet);
}
}
// Start listening to wave events and channel events.
wave.addListener(liveBinder);
// This binder only starts getting events once open() has been called, since
// that is what sets this binder as a mux listener. Since wavelet-to-channel
// binding occurs through event callbacks, this listener setting must occur
// before trying to bind localWavelets.
mux.open(liveBinder, filter, remoteWavelets);
for (ObservableWaveletData local : localWavelets) {
mux.createOperationChannel(local.getWaveletId(), local.getCreator());
}
}
/** Returns the {@link HashedVersion} of the wavelet after all deltas have been applied. */
public HashedVersion getVersionAfterDeltas() {
return deltas.isEmpty() ? snapshotAfterDeltas.getHashedVersion() : deltas.getEndVersion();
}