/// <summary>
/// Insert a topic into the user's combined following topics feed.
/// This feed consists of topics that a user requests to follow, and topics authored by other users that the specified user is following.
/// </summary>
/// <param name="userHandle">User handle</param>
/// <param name="appHandle">App handle</param>
/// <param name="topicHandle">Topic handle</param>
/// <returns>Create following topic task</returns>
public async Task CreateFollowingTopic(
string userHandle,
string appHandle,
string topicHandle)
{
// lookup topic entity
ITopicEntity topicEntity = await this.topicsStore.QueryTopic(topicHandle);
// do the insert
await this.topicsStore.InsertFollowingTopic(StorageConsistencyMode.Strong, userHandle, appHandle, topicHandle, topicEntity.UserHandle);
}
/// <summary>
/// Update topic
/// </summary>
/// <param name="storageConsistencyMode">Storage consistency mode</param>
/// <param name="topicHandle">Topic handle</param>
/// <param name="topicEntity">Topic entity</param>
/// <returns>Update topic task</returns>
public async Task UpdateTopic(
StorageConsistencyMode storageConsistencyMode,
string topicHandle,
ITopicEntity topicEntity)
{
CTStore store = await this.tableStoreManager.GetStore(ContainerIdentifier.Topics);
ObjectTable table = this.tableStoreManager.GetTable(ContainerIdentifier.Topics, TableIdentifier.TopicsObject) as ObjectTable;
Operation operation = Operation.Replace(table, topicHandle, topicHandle, topicEntity as TopicEntity);
await store.ExecuteOperationAsync(operation, storageConsistencyMode.ToConsistencyMode());
}
/// <summary>
/// Update a topic
/// </summary>
/// <param name="processType">Process type</param>
/// <param name="topicHandle">Topic handle</param>
/// <param name="title">Topic title</param>
/// <param name="text">Topic text</param>
/// <param name="blobType">Blob type</param>
/// <param name="blobHandle">Blob handle</param>
/// <param name="categories">Topic categories</param>
/// <param name="reviewStatus">Review status</param>
/// <param name="lastUpdatedTime">Last updated time</param>
/// <param name="topicEntity">Topic entity</param>
/// <returns>Update topic task</returns>
public async Task UpdateTopic(
ProcessType processType,
string topicHandle,
string title,
string text,
BlobType blobType,
string blobHandle,
string categories,
ReviewStatus reviewStatus,
DateTime lastUpdatedTime,
ITopicEntity topicEntity)
{
topicEntity.Title = title;
topicEntity.Text = text;
topicEntity.BlobType = blobType;
topicEntity.BlobHandle = blobHandle;
topicEntity.Categories = categories;
topicEntity.ReviewStatus = reviewStatus;
topicEntity.LastUpdatedTime = lastUpdatedTime;
await this.topicsStore.UpdateTopic(StorageConsistencyMode.Strong, topicHandle, topicEntity);
await this.searchQueue.SendSearchIndexTopicMessage(topicHandle, lastUpdatedTime);
}
/// <summary>
/// Process message
/// </summary>
/// <param name="message">Queue message</param>
/// <returns>Process message task</returns>
protected override async Task Process(IMessage message)
{
// add a new topic to the search index
if (message is SearchIndexTopicMessage)
{
SearchIndexTopicMessage searchIndexTopicMessage = message as SearchIndexTopicMessage;
ITopicEntity topicEntity = await this.topicsManager.ReadTopic(searchIndexTopicMessage.TopicHandle);
// the topic may have been deleted before the search index topic message is processed
if (topicEntity == null)
{
this.Log.LogInformation("Could not find topic " + searchIndexTopicMessage.TopicHandle);
return;
}
// the topic may have been updated before the search index topic message is processed
if (topicEntity.LastUpdatedTime > searchIndexTopicMessage.Timestamp)
{
this.Log.LogInformation("Topic " + searchIndexTopicMessage.TopicHandle + " is newer than the queue message.");
return;
}
await this.searchManager.IndexTopic(
searchIndexTopicMessage.TopicHandle,
topicEntity.Title,
topicEntity.Text,
topicEntity.UserHandle,
topicEntity.AppHandle,
topicEntity.LastUpdatedTime);
}
// remove a topic from the search index
else if (message is SearchRemoveTopicMessage)
{
SearchRemoveTopicMessage searchRemoveTopicMessage = message as SearchRemoveTopicMessage;
await this.searchManager.RemoveTopic(searchRemoveTopicMessage.TopicHandle);
}
// add a new user to the search index
else if (message is SearchIndexUserMessage)
{
SearchIndexUserMessage searchIndexUserMessage = message as SearchIndexUserMessage;
IUserProfileEntity userProfileEntity = await this.usersManager.ReadUserProfile(searchIndexUserMessage.UserHandle, searchIndexUserMessage.AppHandle);
// the user may have been deleted before the search index user message is processed
if (userProfileEntity == null)
{
this.Log.LogInformation("Could not find user " + searchIndexUserMessage.UserHandle + " for app " + searchIndexUserMessage.AppHandle);
return;
}
// the user may have been updated before the search index user message is processed
if (userProfileEntity.LastUpdatedTime > searchIndexUserMessage.Timestamp)
{
this.Log.LogInformation("User " + searchIndexUserMessage.UserHandle + " in app " + searchIndexUserMessage.AppHandle + " is newer than the queue message.");
return;
}
await this.searchManager.IndexUser(
searchIndexUserMessage.UserHandle,
userProfileEntity.FirstName,
userProfileEntity.LastName,
searchIndexUserMessage.AppHandle);
}
// remove a user from the search index
else if (message is SearchRemoveUserMessage)
{
SearchRemoveUserMessage searchRemoveUserMessage = message as SearchRemoveUserMessage;
await this.searchManager.RemoveUser(searchRemoveUserMessage.UserHandle, searchRemoveUserMessage.AppHandle);
}
// bad message
else
{
this.Log.LogError("received message of unknown type " + message.ToString());
}
}