/// <summary>
/// Initializes a new instance of the <see cref="PsiStoreReader"/> class.
/// This provides a fast way to create a reader,
/// by reusing the metadata and index already loaded by an existing store reader.
/// </summary>
/// <param name="other">Another reader pointing to the same store.</param>
public PsiStoreReader(PsiStoreReader other)
{
this.Name = other.Name;
this.Path = other.Path;
this.AutoOpenAllStreams = other.AutoOpenAllStreams;
this.messageReader = new MessageReader(PsiStoreCommon.GetDataFileName(this.Name), this.Path);
this.largeMessageReader = new MessageReader(PsiStoreCommon.GetLargeDataFileName(this.Name), this.Path);
this.indexCache = other.indexCache.AddRef();
this.metadataCache = other.metadataCache.AddRef();
}
/// <summary>
/// Initializes a new instance of the <see cref="PsiStoreReader"/> class.
/// </summary>
/// <param name="name">The name of the application that generated the persisted files, or the root name of the files.</param>
/// <param name="path">The directory in which the main persisted file resides or will reside, or null to create a volatile data store.</param>
/// <param name="metadataUpdateHandler">Delegate to call.</param>
/// <param name="autoOpenAllStreams">Automatically open all streams.</param>
public PsiStoreReader(string name, string path, Action <IEnumerable <Metadata>, RuntimeInfo> metadataUpdateHandler, bool autoOpenAllStreams = false)
{
this.Name = name;
this.Path = PsiStore.GetPathToLatestVersion(name, path);
this.AutoOpenAllStreams = autoOpenAllStreams;
// open the data readers
this.messageReader = new MessageReader(PsiStoreCommon.GetDataFileName(this.Name), this.Path);
this.largeMessageReader = new MessageReader(PsiStoreCommon.GetLargeDataFileName(this.Name), this.Path);
this.indexCache = Shared.Create(new PageIndexCache(name, this.Path));
this.metadataCache = Shared.Create(new MetadataCache(name, this.Path, metadataUpdateHandler));
}
/// <summary>
/// Creates a stream to write messages to.
/// </summary>
/// <param name="streamId">The id of the stream, unique for this store. All messages with this stream id will be written to this stream.</param>
/// <param name="streamName">The name of the stream. This name can be later used to open the stream for reading.</param>
/// <param name="indexed">Indicates whether the stream is indexed or not. Indexed streams have a small index entry in the main data file and the actual message body in a large data file.</param>
/// <param name="typeName">A name identifying the type of the messages in this stream. This is usually a fully-qualified type name or a data contract name, but can be anything that the caller wants.</param>
/// <returns>The complete metadata for the stream just created.</returns>
public PsiStreamMetadata OpenStream(int streamId, string streamName, bool indexed, string typeName)
{
if (this.metadata.ContainsKey(streamId))
{
throw new InvalidOperationException($"The stream id {streamId} has already been registered with this writer.");
}
var meta = new PsiStreamMetadata(streamName, streamId, typeName);
meta.OpenedTime = Time.GetCurrentTime();
meta.IsPersisted = true;
meta.IsIndexed = indexed;
meta.PartitionName = this.name;
meta.PartitionPath = this.path;
this.metadata[streamId] = meta;
this.WriteToCatalog(meta);
// make sure we have a large file if needed
if (indexed)
{
this.largeMessageWriter = this.largeMessageWriter ?? new MessageWriter(PsiStoreCommon.GetLargeDataFileName(this.name), this.path);
}
return(meta);
}
