/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.waveprotocol.box.server.waveserver;
import com.google.common.collect.ImmutableSet;
import org.waveprotocol.box.common.ExceptionalIterator;
import org.waveprotocol.box.server.frontend.CommittedWaveletSnapshot;
import org.waveprotocol.wave.federation.Proto.ProtocolWaveletDelta;
import org.waveprotocol.wave.model.id.WaveId;
import org.waveprotocol.wave.model.id.WaveletId;
import org.waveprotocol.wave.model.id.WaveletName;
import org.waveprotocol.wave.model.operation.wave.TransformedWaveletDelta;
import org.waveprotocol.wave.model.version.HashedVersion;
import org.waveprotocol.wave.model.wave.ParticipantId;
import java.util.Collection;
/**
* Provides wavelet snapshots and history, and accepts delta submissions to
* wavelets.
*/
public interface WaveletProvider {
/**
* Receives the result of a delta submission request.
*/
interface SubmitRequestListener {
/**
* Notifies the listener that the delta was successfully applied.
*
* @param operationsApplied number of operations applied
* @param hashedVersionAfterApplication wavelet hashed version after the delta
* @param applicationTimestamp timestamp of delta application
*/
void onSuccess(int operationsApplied, HashedVersion hashedVersionAfterApplication,
long applicationTimestamp);
/**
* Notifies the listener that the delta failed to apply.
*/
void onFailure(String errorMessage);
}
/**
* Initializes the provider from storage. No other method is valid until
* initialization is complete.
*/
void initialize() throws WaveServerException;
/**
* Request that a given delta is submitted to the wavelet.
*
* @param waveletName name of wavelet.
* @param delta to be submitted to the server.
* @param listener callback which will return the result of the submission.
*/
void submitRequest(WaveletName waveletName, ProtocolWaveletDelta delta,
SubmitRequestListener listener);
/**
* Retrieve the wavelet history of deltas applied to the wavelet.
*
* @param waveletName name of wavelet.
* @param versionStart start version (inclusive), minimum 0.
* @param versionEnd end version (exclusive).
* @return deltas in the range as requested, ordered by applied version.
* @throws AccessControlException if {@code versionStart} or
* {@code versionEnd} are not in the wavelet history.
* @throws WaveServerException if storage access fails or if the wavelet is in
* a bad state
*/
Collection<TransformedWaveletDelta> getHistory(WaveletName waveletName,
HashedVersion versionStart, HashedVersion versionEnd) throws WaveServerException;
/**
* Check if the specified participantId has access to the named wavelet.
*
* @param waveletName name of wavelet.
* @param participantId id of participant attempting to gain access to
* wavelet, or null if the user isn't logged in.
* @return true if the wavelet exists and the participant is a participant on
* the wavelet.
* @throws WaveServerException if storage access fails or if the wavelet is in
* a bad state
*/
boolean checkAccessPermission(WaveletName waveletName, ParticipantId participantId)
throws WaveServerException;
/**
* Returns an iterator over all waves in the server.
*
* The iterator may or may not include waves created after the iterator is returned.
*
* @return an iterator over the ids of all waves
* @throws WaveServerException if storage access fails
*/
ExceptionalIterator<WaveId, WaveServerException> getWaveIds() throws WaveServerException;
/**
* Looks up all wavelets in a wave.
*
* @param waveId wave to look up
* @return ids of all non-empty wavelets
* @throws WaveServerException if storage access fails
*/
ImmutableSet<WaveletId> getWaveletIds(WaveId waveId) throws WaveServerException;
/**
* Request the current state of the wavelet.
*
* @param waveletName the name of the wavelet
* @return the wavelet, or null if the wavelet doesn't exist
* @throws WaveServerException if storage access fails or if the wavelet is in
* a bad state
*/
CommittedWaveletSnapshot getSnapshot(WaveletName waveletName) throws WaveServerException;
}