/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.wave.concurrencycontrol.channel;
import org.waveprotocol.wave.concurrencycontrol.common.ChannelException;
import org.waveprotocol.wave.model.operation.wave.TransformedWaveletDelta;
import org.waveprotocol.wave.model.operation.wave.WaveletDelta;
import org.waveprotocol.wave.model.version.HashedVersion;
import org.waveprotocol.wave.model.wave.data.ObservableWaveletData;
import java.util.List;
/**
* A raw channel for messages on a single wavelet.
*
* @author anorth@google.com (Alex North)
*/
public interface WaveletChannel {
/**
* Receiver for wavelet updates.
*/
interface Listener {
/**
* Called when a stream update is received. At least one of {@code deltas} and
* {@code lastCommittedVersion} will be non-null or non-empty. {@code
* currentSignedVersion} is non-null only in the first message when a stream
* is reconnecting.
*
* @param deltas optional update message
* @param lastCommittedVersion optional committed version (may be null)
* @param currentSignedVersion optional current/latest version on the server
* @throw ChannelException if the channel fails in processing the update
*/
public void onWaveletUpdate(List<TransformedWaveletDelta> deltas,
HashedVersion lastCommittedVersion, HashedVersion currentSignedVersion)
throws ChannelException;
/**
* Called when a stream update is received. At least one of {@code snapshot} and
* {@code lastCommittedVersion} will be non-null. {@code
* currentSignedVersion} is non-null only in the first message when a stream
* is reconnecting.
*
* @param snapshot optional wavelet metadata (may be null)
* @param lastCommittedVersion optional committed version (may be null)
* @param currentSignedVersion optional current/latest version on the server
* @throw ChannelException if the channel fails in processing the update
*/
public void onWaveletSnapshot(ObservableWaveletData snapshot,
HashedVersion lastCommittedVersion,
HashedVersion currentSignedVersion)
throws ChannelException;
}
/**
* Submits a delta on this channel.
*
* @param delta delta to submit
* @param callback invoked with the submission response
*/
public void submit(WaveletDelta delta, SubmitCallback callback);
/**
* @return Debug string that details profile information regarding data being sent.
*/
public String debugGetProfilingInfo();
}