// Copyright 2012,2013 Vaughn Vernon
//
// 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.saasovation.common.port.adapter.persistence.leveldb;
import java.util.List;
import com.saasovation.common.notification.Notification;
import com.saasovation.common.notification.PublishedNotificationTracker;
import com.saasovation.common.notification.PublishedNotificationTrackerStore;
public class LevelDBPublishedNotificationTrackerStore
extends AbstractLevelDBRepository
implements PublishedNotificationTrackerStore {
private static final String PRIMARY = "PUBNOTIF_TRACKER#PK";
private String typeName;
public LevelDBPublishedNotificationTrackerStore(
String aLevelDBDirectoryPath,
String aPublishedNotificationTrackerType) {
super(aLevelDBDirectoryPath);
this.setTypeName(aPublishedNotificationTrackerType);
}
@Override
public PublishedNotificationTracker publishedNotificationTracker() {
return this.publishedNotificationTracker(this.typeName());
}
@Override
public PublishedNotificationTracker publishedNotificationTracker(String aTypeName) {
LevelDBUnitOfWork uow = LevelDBUnitOfWork.readOnly(this.database());
LevelDBKey primaryKey = new LevelDBKey(PRIMARY, this.typeName());
PublishedNotificationTracker publishedNotificationTracker =
uow.readObject(primaryKey, PublishedNotificationTracker.class);
if (publishedNotificationTracker == null) {
publishedNotificationTracker = new PublishedNotificationTracker(this.typeName());
}
return publishedNotificationTracker;
}
@Override
public void trackMostRecentPublishedNotification(
PublishedNotificationTracker aPublishedNotificationTracker,
List<Notification> aNotifications) {
int lastIndex = aNotifications.size() - 1;
if (lastIndex >= 0) {
long mostRecentId = aNotifications.get(lastIndex).notificationId();
aPublishedNotificationTracker.setMostRecentPublishedNotificationId(mostRecentId);
LevelDBKey lockKey = new LevelDBKey(PRIMARY, this.typeName());
LevelDBUnitOfWork uow = LevelDBUnitOfWork.start(this.database());
uow.lock(lockKey.key());
this.save(aPublishedNotificationTracker, uow);
}
}
@Override
public String typeName() {
return this.typeName;
}
private void save(
PublishedNotificationTracker aPublishedNotificationTracker,
LevelDBUnitOfWork aUoW) {
LevelDBKey primaryKey = new LevelDBKey(PRIMARY, this.typeName());
aUoW.write(primaryKey, aPublishedNotificationTracker);
}
private void setTypeName(String aTypeName) {
this.typeName = aTypeName;
}
}