/**
* Copyright 2012 Apache Wave
*
* 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 org.waveprotocol.box.common.DeltaSequence;
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.AddParticipant;
import org.waveprotocol.wave.model.operation.wave.RemoveParticipant;
import org.waveprotocol.wave.model.operation.wave.TransformedWaveletDelta;
import org.waveprotocol.wave.model.operation.wave.WaveletOperation;
import org.waveprotocol.wave.model.version.HashedVersion;
import org.waveprotocol.wave.model.wave.ParticipantId;
import org.waveprotocol.wave.model.wave.data.ReadableWaveletData;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* Forwards wavelet notifications that can cause index changes to subscribers.
*
* @author yurize@apache.org (Yuri Zelikov)
*/
public class PerUserWaveViewDistpatcher implements WaveBus.Subscriber, PerUserWaveViewBus {
private static final CopyOnWriteArraySet<PerUserWaveViewBus.Listener> listeners =
new CopyOnWriteArraySet<PerUserWaveViewBus.Listener>();
@Override
public void waveletUpdate(ReadableWaveletData wavelet, DeltaSequence deltas) {
WaveletId waveletId = wavelet.getWaveletId();
WaveId waveId = wavelet.getWaveId();
WaveletName waveletName = WaveletName.of(waveId, waveletId);
// Find whether participants were added/removed and update the views
// accordingly.
for (TransformedWaveletDelta delta : deltas) {
for (WaveletOperation op : delta) {
if (op instanceof AddParticipant) {
ParticipantId user = ((AddParticipant) op).getParticipantId();
// Check first if we need to update views for this user.
for (Listener listener : listeners) {
listener.onParticipantAdded(waveletName, user);
}
} else if (op instanceof RemoveParticipant) {
ParticipantId user = ((RemoveParticipant) op).getParticipantId();
for (Listener listener : listeners) {
listener.onParticipantRemoved(waveletName, user);
}
}
}
}
}
@Override
public void waveletCommitted(WaveletName waveletName, HashedVersion version) {
// No op.
}
@Override
public void addListener(Listener listener) {
listeners.add(listener);
}
@Override
public void removeListener(Listener listener) {
listeners.remove(listener);
}
}