/*
* Copyright 2012 Google Inc. All Rights Reserved.
*
* 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 com.google.walkaround.wave.server.robot;
import com.google.appengine.api.datastore.Entity;
import com.google.common.base.Preconditions;
import com.google.inject.Inject;
import com.google.walkaround.slob.shared.SlobId;
import com.google.walkaround.util.server.appengine.AbstractDirectory;
import com.google.walkaround.util.server.appengine.CheckedDatastore;
import com.google.walkaround.util.server.appengine.DatastoreUtil;
import com.google.walkaround.util.shared.Assert;
import com.google.walkaround.wave.server.robot.VersionDirectory.RobotNotified;
import org.waveprotocol.wave.model.util.Pair;
import org.waveprotocol.wave.model.wave.ParticipantId;
/**
* A mapping from <SlobId, RobotId> to version number that the robot has last
* seen on the conversational wavelet.
*
* @author ljv@google.com (Lennard de Rijk)
*/
public class VersionDirectory extends AbstractDirectory<RobotNotified, Pair<SlobId, ParticipantId>> {
private static final String VERSION_PROPERTY = "Version";
public static class RobotNotified {
private final Pair<SlobId, ParticipantId> id;
private final long version;
RobotNotified(SlobId slobId, ParticipantId robotId, long version) {
Preconditions.checkNotNull(slobId);
Preconditions.checkNotNull(robotId);
this.id = Pair.of(slobId, robotId);
this.version = version;
}
public long getVersion() {
return version;
}
}
@Inject
public VersionDirectory(CheckedDatastore datastore) {
super(datastore, "RobotNotified");
}
@Override
protected Pair<SlobId, ParticipantId> getId(RobotNotified e) {
return e.id;
}
@Override
protected RobotNotified parse(Entity e) {
String[] parts = e.getKey().getName().split(" ", -1);
Assert.check(parts.length == 2, "Wrong number of spaces in key: %s", e);
SlobId slobId = new SlobId(parts[0]);
ParticipantId robotId = ParticipantId.ofUnsafe(parts[1]);
long version = DatastoreUtil.getExistingProperty(e, VERSION_PROPERTY, Long.class);
return new RobotNotified(slobId, robotId, version);
}
@Override
protected void populateEntity(RobotNotified in, Entity out) {
DatastoreUtil.setNonNullUnindexedProperty(out, VERSION_PROPERTY, in.version);
}
@Override
protected String serializeId(Pair<SlobId, ParticipantId> id) {
Assert.check(!id.getFirst().getId().contains(" "), "SlobId contains space: %s", id);
Assert.check(!id.getSecond().getAddress().contains(" "), "RobotId contains space: %s", id);
return id.getFirst().getId() + " " + id.getSecond().getAddress();
}
}